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Synthesis and Characterization of Rare Earth Complexes with Phthalanilic Acids and Amino Acids
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作者 石进超 彭晓琦 +1 位作者 贾婴琪 王振军 《Journal of Rare Earths》 SCIE EI CAS CSCD 2000年第1期18-21,共4页
The complexes with the general formula REP3A· H2O [P = 2- (COO ) C6H4CONHC6H4X, X=2-CI, 4-Br; A=Gly, Ala, Leu; RE=Pr3+, Nd3+] were synthesized and characlerized by elemental analysis, IR and reflectance electro... The complexes with the general formula REP3A· H2O [P = 2- (COO ) C6H4CONHC6H4X, X=2-CI, 4-Br; A=Gly, Ala, Leu; RE=Pr3+, Nd3+] were synthesized and characlerized by elemental analysis, IR and reflectance electronic spectra and TG methods. The results show that rare earth ion in each complex is coordinated by three oxygen atoms. One is from the amido and the other two from the hydroxyl in the carboxylate and the amino acid respectively, and each complex contains one coordinate water molecule. Condon parameters Fk, Lande parameters(4f), Nephelanxetic ratio(β), percentage convalency parameter(δ) and bonding parameter(b ) of the chelates were calculated from the reflectance electronic spectra, indicating certain covalent character in the metalligand bond. The apparent decompose activation energies were evaluated and the decompose mechanism were discussed. 展开更多
关键词 rare earths PRASEODYMIUM NEODYMIUM phthalanilic acid amino acids energy interaction parameter
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THE CRYSTAL STRUCTURE OF RARE EARTH COMPLEX WITH AMINO ACIDS Ⅱ The Crystal Structure of Gtutamate Comptex of Erbium Perchtorate
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作者 Zeng Lin WANG~(※※), Ning Hai HU, Chun Li NIU, Kui Yue YANG, Jia Zan NI (Changchun Institute of Applied Chemistry, Chinese Acadimia Sinica, Changchun, 130022) 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第12期961-962,共2页
The crystat structure of {[Er;(L—Glu);(H;O);](ClO;);·3H;O);has been studied by X-ray diffraction. The crystal is monoctinic with space group P2;and cell parameters a=19.987(3) , b=16.505(3) , c=11.040... The crystat structure of {[Er;(L—Glu);(H;O);](ClO;);·3H;O);has been studied by X-ray diffraction. The crystal is monoctinic with space group P2;and cell parameters a=19.987(3) , b=16.505(3) , c=11.040(2) , β=104.69(1);, V=3538(1) , Z=2, Dc=2.29 g. cm;, μ=53.2 cm;, F(000)=2384. The asymmetric unit contains two complex motecules and four centre ions. Each erbium (Ⅲ) is coordinated by five oxygen donors from four different glutamates and four oxygen donors from the aqua ligand to form a nine coordination potyhedron. The mean distances of Er—0 (carboxylate) and Er—Ow are 2.439 and 2.41 respectivety. The finat R and Rw are 0.043 and 0. 058, respectivety. 展开更多
关键词 CI The Crystal Structure of Gtutamate Comptex of Erbium Perchtorate THE CRYSTAL STRUCTURE of rare earth complex with amino acidS
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Synthesis and Complexing Properties of Three Aminopolyphosphonic Acids with Rare Earth Ions
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作者 高锦章 赵国虎 +2 位作者 韩小茜 康敬万 王荣 《Rare Metals》 SCIE EI CAS CSCD 1999年第4期254-263,共10页
Three white crystalline aminopolyphosphonic acids, DTHMP, TTHMP and TPHMP were synthesized by a modified Mannich reaction under gentle conditions. The products were isolated and purified with a SP-Sephadex C-25 column... Three white crystalline aminopolyphosphonic acids, DTHMP, TTHMP and TPHMP were synthesized by a modified Mannich reaction under gentle conditions. The products were isolated and purified with a SP-Sephadex C-25 column. The acid-base and complexing properties of three aminopolyphosphonic acids with rare earth ions were investigated by means of potentiometric titration in aqueous medium at (25 +/- 0.1) degrees C and ionic strength I = 0.1 mol/L KNO3. The successive protonation constants of ligands and the formation constants of complexes with rare earth elements were obtained. The results show a double-double effect for lgK(MHiL) against atomic number of lanthanide. The properties are advantageous for the separation of the rare earth elements. 展开更多
关键词 rare earth elements aminopolyphosphonic acid complexing properties
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Synthesis,Characterization and Antibacterial Properties of Rare Earth (Ce^(3+) ,Pr^(3+) ,Nd^(3+) ,Sm^(3+) ,Er^(3+) ) Complexes with L-Aspartic Acid and o-Phenanthroline 被引量:15
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作者 郁慧 何其庄 +1 位作者 杨静 郑文捷 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期4-8,共5页
Five novel ternary complexes of rare earth ions with L-Aspartic acid (Asp) and o-phenanthroline (Phen) were synthesized in ethanol aqueous solution. Their compositions were characterized by elemental analysis, molar c... Five novel ternary complexes of rare earth ions with L-Aspartic acid (Asp) and o-phenanthroline (Phen) were synthesized in ethanol aqueous solution. Their compositions were characterized by elemental analysis, molar conductance, FT-IR, Raman, UV-VIS and TG-DTA. The compositions of the complexes were confirmed to be: RE( Asp)3PhenCl3·3H2O (RE: Ce3+ , Pr3+ , Nd3+ , Sm3+ , Er3+ ). The antibacterial activity test shows that all these complexes exhibit excellent antibacterial ability against Escherichia coli, Staphylococcus aureus and Candida albicans. The antimicrobial spectrum of the complexes are broad. 展开更多
关键词 complexES O-PHENANTHROLINE L-Aspartic acid antibacterial activity rare earths
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Luminescent Properties of Bi-Rare Earth Complexes with m-methylbenzoic Acid and 1,10-phenanthroline 被引量:4
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作者 王淑萍 王瑞芬 刘翠格 《Journal of Rare Earths》 SCIE EI CAS CSCD 2002年第5期453-456,共4页
The bi rare earth complexes EuTb( m MBA) 6(phen) 2·2H 2O, TbY( m MBA) 6(phen) 2·2H 2O were synthesized by the reaction of RECl 3 with m methylbenzoic acid and 1,10 phenanthroline in eth... The bi rare earth complexes EuTb( m MBA) 6(phen) 2·2H 2O, TbY( m MBA) 6(phen) 2·2H 2O were synthesized by the reaction of RECl 3 with m methylbenzoic acid and 1,10 phenanthroline in ethanol solution, where m MBA=m methylbenzoate and phen=1,10 phenanthroline. The luminescence properties of the title complexes were studied in comparison with the corresponding complexes Eu 2( m MBA) 6(phen) 2·2H 2O and Tb 2( m MBA) 6(phen) 2·2H 2O respectively. The results indicate that the emission intensity from europium ion can be greatly enhanced by the terbium ion, while the emission from terbium ion was strongly quenched by europium ion in EuTb( m MBA) 6(phen) 2·2H 2O; the emission intensity from terbium ion can be greatly enhanced by yttrium ion in TbY( m MBA) 6(phen) 2·2H 2O. The mechanism about the results was discussed. 展开更多
关键词 rare earths luminescence property mixed rare earth complex m methylbenzoic acid 1 10 phenanthroline
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Synthesis and spectroscopic characterization of fluorescent solid rare-earth complexes with hydroxamic acids 被引量:2
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作者 LI Yangsheng and LI FanFaculty of Chemistry and Materials Science, Nanchang University, Nanchang 200437, China 《Rare Metals》 SCIE EI CAS CSCD 2002年第3期163-169,共7页
The complexes RE_2(DHYA)_3 centre dot nH_2O in the title bar were synthesizedthrough some reactions of trivalent rare-earth ions. In the process of synthesis, dihydroxamicacids were taken as ligands while the alcohol ... The complexes RE_2(DHYA)_3 centre dot nH_2O in the title bar were synthesizedthrough some reactions of trivalent rare-earth ions. In the process of synthesis, dihydroxamicacids were taken as ligands while the alcohol was taken as a solvent. The ligands includedadipylhydroxamic acid (ADHA), p-phthalichydroxamic acid (PPHA), oxalohydroxamic acid (OXHA),butadihydroxamic acid (BDHA), o-phthalichydroxamic acid (OPHA), benzoylhydroxamic acid (BHA), etc.Measured at 25 deg C, the molar conductances in various modes are 13.00-21.05 S centre dot cm^2centre dot mol^(-1), which shows that rare-earth complexes are nonelectrolytes and the hydroxaminogroups of the complexes have taken part in bonding. Infrared spectra, ultraviolet spectra, nuclearmagnetic resonance (~1HNMR) spectra, and fluorescence spectra were used to investigate thecomplexes. Experiments have proved that the complexes of En^(3+)and Tb^(3+) with aromatic hydroxamicacids have good fluorescent characteristics. 展开更多
关键词 hydroxamic acid complex rare earth
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Syntheses, Characterization and Antitumour Activities of Rare Earth Metal Complexes with 2-(((4,6-dimethyl)-2-Pyrimidinyl)thio)-Acetic Acid 被引量:1
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作者 曲建强 王流芳 +3 位作者 刘瑛琦 宋玉民 王印月 贾晓飞 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第1期15-19,共5页
Eight rare earth metal ( Ⅲ ) complexes with 2- ( ((4,6-dimethyl)-2-pyrimidinyl) thio)-acetic acid, LnL3· n H2O [HL = 2-(((4,6-dimethyl)-2-pyrimidinyl)thio)-acetic acid; Ln = La, Ce, Pr, Nd, Sm Eu, ... Eight rare earth metal ( Ⅲ ) complexes with 2- ( ((4,6-dimethyl)-2-pyrimidinyl) thio)-acetic acid, LnL3· n H2O [HL = 2-(((4,6-dimethyl)-2-pyrimidinyl)thio)-acetic acid; Ln = La, Ce, Pr, Nd, Sm Eu, Gd, Tb; n = 4 or 5], were prepared and characterized by elemental analysis, complexometric titration, thermal analysis, conductivity, IR and ^1H- NMR. The results reveal that carboxyl group of the hgand coordinates with rare earth ions in bidentate mode after deprotonated. The water molecules exist as crystal water in the complexes. The anti-tumour activities of HL and some complexes were tested by both the MTT and SRB methods. The results show that the suppression ratios of some complexes against the tested tumour cells (HL-60 human leukemia cell lines, BGC-823 human gastric carcinoma cell lines, hela human cervix adenocarcinoma cell lines and Bel-7402 human hepatic carcinoma cell lines) are superior to HL. 展开更多
关键词 2-(((4 6-dimethyl)-2-pyfimidinyl) thio)-acetic acid complexES anti-tumour activities rare earths
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Syntheses aod Crystal Structures of Rare Earth Complexes with Adamantanecarboxylic Acid, [LnL_3(HL)(H_2O)]_2·2EtOH·2H_2O (Ln=Nd (1), La (2))
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作者 Zhu Zhili Feng Yunlong Lin Hong 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第5期647-647,共1页
The title complexes (LnL3 (HL) (H2O) ]2· 2EtOH·2H2O (Ln= Nd (1), La (2), HL=adamantanecarboxylic acid) were prepared and determined by single-crystal X-ray diffraction. Both complexes crystallize ... The title complexes (LnL3 (HL) (H2O) ]2· 2EtOH·2H2O (Ln= Nd (1), La (2), HL=adamantanecarboxylic acid) were prepared and determined by single-crystal X-ray diffraction. Both complexes crystallize in triclinic system with space group P 1^-, cell parameters are: complex (1) a = 1.0556(2) nm, b =1.4913(3) nm, c = 1.4920(3) nm, a = 106.26 (3)°, β=93.51(3)°, γ=97.23(3)°, V=2.2253 (5) nm^3, Dcal=1.409 g · cm^-3, Z = I , F ( 000 ) = 990, μ(Mo Kα) = 1. 225 mm^-1, M, = 1884.50; complex (2) a = 1.0453(2) nm, b = 1.4971(3)nm, c = 1.5052(3) nm, α = 106.07(3)°, β =93.58 (3)°, γ=97.56(3)°, V=2.2391(5)nm^3, Dcal= 1.397 g·cm^-3, Z = 1, F(000) =984, μ(Mo Kα) = 1.015 mm^-1, Mr= 1877.88. The final R and wR are 0. 0396 and 0. 1062 for 8589 (1 ≥ 2σ (I)) observed reflections for complex (1), 0.0505 and 0. 1344 for 8417 ( 1 ≥ 2σ (1) ) observed reflections for complex (2), respectively. The crystals are consisted of a binuelear molecule. The coordination geometry of the Ln( Ⅲ ) ion can be described as trieapped trigonal prism. 展开更多
关键词 Nd( Ⅲ) complex Nd( complex adamantanecarboxylic acid crystal structure rare earths
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Synthesis and Characterization of Rare Earth Solid Complexes with Sodium 5-Aminosalicylate
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作者 张秀英 李书静 +1 位作者 雷雪峰 马君现 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第2期143-147,共5页
Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by I... Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by IR, UV, ()~1H NMR spectra, TG-DTA, fluorescence, elemental analyses, molar conductance and magnetic susceptibility. The ten rare earth complexes exist in dimeric form probably and the coordination number is seven. The antibacterial activity of the ligand and six complexes was also tested against Staphylococcus aureus, Escherichia coli and Bacillus subtilis, and the effect of Yb complex at 20 mg·ml^(-1) against Staphylococcus aureus is most significant. 展开更多
关键词 rare earth complexes 5-amino salicylic acid antibacterial activity
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Complex behaviour of trivalent rare earth elements by humic acids 被引量:4
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作者 Geng An chaoResearch Institute of Environmental Engineering,Fushun Petroleum Institute,Liaoning 113001,ChinaZhang Shen Institute of Geography,Chinese Academy of Sciences,Beijing 100101,ChinaHarald Hфiland Department of Chemistry,Univers 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1998年第3期47-53,共7页
The complexation behaviours of trivalent rare earth elements (La, Ce, Ho and Yb) by two types of humic acids were investigated under a specified set of conditions. Humic acids show quite different complexation capaci... The complexation behaviours of trivalent rare earth elements (La, Ce, Ho and Yb) by two types of humic acids were investigated under a specified set of conditions. Humic acids show quite different complexation capacities an conditional formation constants with the REEs. Apparently there are two types of binding sites in the functional groups of humic acid, in which the first binding sites have stronger ability than the second. Cerium shows the largest complexation capacities and highest formation constants among the four REEs with two humic acids, this anomaly may be relative to the distribution pattern of the REEs in seawater. The experimental results were comparable to the values of other metals reported and provided the basic data for environmental geochemistry of rare earth elements. 展开更多
关键词 complex behaviour rare earth elements humic acid.
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Study of Complexes of Lanthanum with Amino Acids by Titration Calorimeter 被引量:2
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作者 Ye Gang, Wang Cun-xin, Qu Song-sheng College of Chemistry and Environment Science, Wuhan University, Wuhan 430072, China 《Wuhan University Journal of Natural Sciences》 EI CAS 2000年第4期479-484,共6页
The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The ent... The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1∶2) is much less than that of the complexes (1∶1). 展开更多
关键词 titration calorimeter rare earth amino acid complexES steric effects
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Study on Copolymerization of Rare Earth-Carboxylic Acid Complex 被引量:1
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作者 邱关明 张明 +3 位作者 严长浩 周兰香 戴少俊 Okamo to Hiroshi 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第6期618-621,共4页
Complex of rare earth with carboxylic acid was prepared by precipitation and direct method. It was copolymerized with such monomers as acrylic acid and other ones to synthesize ionomer of rare earth and organic polyme... Complex of rare earth with carboxylic acid was prepared by precipitation and direct method. It was copolymerized with such monomers as acrylic acid and other ones to synthesize ionomer of rare earth and organic polymer with different rare earth contents. Its glass-transition temperature and heat stability were analyzed by TG and DTA. Infra-red detector was used to show its structure. The effect of rare earth complex prepared by different methods on copolymerization and properties of copolymers was also discussed. 展开更多
关键词 organic material rare earth ionomer COPOLYMERIZATION rare earth complex monomer rare earth-carboxylic acid complex rare earths
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Synthesis and Characterization of Lanthanum Complexes with Amino Acid Schiff Base
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作者 张秀英 张有娟 杨林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2001年第3期177-180,共4页
Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, mola... Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, molar conductance, infrared, electronic spectra, H-1 NMR, thermogravimetric and differential thermal analysis. 展开更多
关键词 rare earths LANTHANUM amino acid Schiff base complex SYNTHESIS
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pH-Potentiometric Study on Rare Earths and Calcium Binary and Ternary Complexes with DL-Malic Acid and L-Hydroxyproline
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作者 王瑞瑶 高峰 +3 位作者 牛春吉 倪嘉缵 金天柱 王祥云 《Journal of Rare Earths》 SCIE EI CAS CSCD 1998年第1期2-5,共4页
The stability constants of ML binary system and MLL′(M=La^3+~Yb^3+, Y^3+ and Ca^2+; L=DLmalic aicd, L′=Lhydroxyproline) ternary system were determined by pHpotentiometric method under the simulating physiological c... The stability constants of ML binary system and MLL′(M=La^3+~Yb^3+, Y^3+ and Ca^2+; L=DLmalic aicd, L′=Lhydroxyproline) ternary system were determined by pHpotentiometric method under the simulating physiological condition(37 ℃, I=015 mol/L NaCl). The complex species MpLqL′rHs(abbr as pqrs) in the sytems were ascertained by program COMPLEX. The results show that there are three species(1101, 1100 and 1200) in ML binary system and one species(1010) in ML′ binary system. In addition to the above four species, a new species, 1112 was found in the MLL′-ternary system, which is the only species of mixed ligands. Rare earth ions form more stable complexes than calcium ion does and the stability differences between their complexes in the ternary system are less than that in the binary system. The distributions of all the species in LaLL′-ternary system vs pH are discussed. 展开更多
关键词 rare earths CALCIUM DLMalic acid LHydroxyproline Ternary complex
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Investigation on the Coordinate Structures of the Rare Earth Metal Complexes with Edta and Cydta Ligands
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作者 Wang Jun, Zhang Xiang-dong, Zhang Yang, Liu Zhen-rong Department of Chemistry, Liaoning University, Shenyang 110036, Liaoning, China 《Wuhan University Journal of Natural Sciences》 CAS 2003年第04A期1131-1137,共7页
The crystal and molecular structures of cydta (trans-1, 2-cyclohexanediaminetetraacetic acid) have been determined by single\|crystal X-ray structure analyses. The reasons that RE Ⅲ -edta and RE Ⅲ -cydta compl... The crystal and molecular structures of cydta (trans-1, 2-cyclohexanediaminetetraacetic acid) have been determined by single\|crystal X-ray structure analyses. The reasons that RE Ⅲ -edta and RE Ⅲ -cydta complexes select different coordinate structures were discussed and illustrated through the comparison of the molecular and crystal structures between edta and cydta, (NH_ 4 )\[Y Ⅲ (edta)(H_ 2 O)_ 3 \]\55H_ 2 O and (NH_ 4 )\[Y Ⅲ (cydta)(H_ 2 O)_ 2 \]\55H_ 2 O as well as (NH_ 4 )\[Gd Ⅲ (edta)(H_ 2 O)_ 3 \]\55H_ 2 O and (NH_ 4 )\[Gd Ⅲ (cydta) (H_ 2 O) _ 2 \]\55H_ 2 O complexes. 展开更多
关键词 rare earth edta (ethylenediaminetetraacetic acid) cydta (trans-1 2-cyclohexanediaminetetraacetic acid) complexES coordinate structures
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Preparation of Ternary Lanthanide Complexes with Unsaturated Acid and 1,10-Phenanthroline, and Their Anti-Inflammatory Action 被引量:4
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作者 刘鸿 张惠珍 +1 位作者 曾伟 曾正志 《Journal of Rare Earths》 SCIE EI CAS CSCD 2004年第S1期46-50,共5页
Four ternary lanthanide complexes with unsaturated acid and 1,10-phenanthroline are prepared in methanol and characterized by elemental analysis, molar conductance, UV, IR, (()~1H) NMR and XPS. The results from this p... Four ternary lanthanide complexes with unsaturated acid and 1,10-phenanthroline are prepared in methanol and characterized by elemental analysis, molar conductance, UV, IR, (()~1H) NMR and XPS. The results from this paper show that the complexes Ln(phen)(SA)_3·2H_2O or Ln(phen)(CA)_3·H_2O (Ln=Ce(Ⅲ), Sm(Ⅲ) and Eu(Ⅲ), (phen=1,10-)phenanthroline, SA=Sorbate and CA=Cinnamate) has better anti-inflammatory effect than cerium nitrate and their gremores are steadier than cerium nitrate gremor. And there is a kind of medicament which can replace the cerium nitrate gremor completely in treating burn. 展开更多
关键词 unsaturated acid 1 10-PHENANTHROLINE ternary lanthanide complexes ANTI-INFLAMMATORY BURN rare earths
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Synthesis,Characterization and Fluorescence Properties of Europium,Terbium Complexes with Biphenyl-4-Carboxylic Acid and o-Phenanthroline 被引量:4
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作者 赵永亮 赵凤英 +1 位作者 李强 高德青 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期18-22,共5页
Two series of solid complexes of europium and terbium with biphenyl 4-carboxylic acid and phen were synthesized and characterized in this report. Their elemental analysis, molar conductivities and TG-DTA studies indic... Two series of solid complexes of europium and terbium with biphenyl 4-carboxylic acid and phen were synthesized and characterized in this report. Their elemental analysis, molar conductivities and TG-DTA studies indicate that the complexes have the composition of Eu(phen)L3·1/2H2O, Eu0.5RE0.5(phen) L3·1/2H2O; Tb (phen) L3·H2O and Tb0.5 RE0.5(Phen)L3·1/2H2O. (RE = Y3+, La3+ and Gd3+; L = biphenyl 4-carboxylic acid; phen = o-Phenanthroline). The studies of their IR, UV 1H NMR and molar conductivities demonstrate that biphenyl 4-carboylic acid is bounded with RE (III ) ion. Rare earth ions coordinate with two nitrogen atoms of phen molecules directly in these rare earth complexes. The fluorescence spectra and fluorescence lifetimes of the rare earth complexes show that the fluorescent intensity and lifetime of a series of europium complexes are longer than those of the series of terbium complexes as having the some ligands. There are better fluorescent intensity and lifetime of hetero-nuclear rare earth complexes than homo-nuclear rare earth complexes for europium complexes. The fluorescence emission intensity of Eu3 + is raised by inert fluorescent rare earth ions (Y3+ , Gd3+ and La3+ ), but in Tb3+ hetero-nuclear rare earth complexes the intensity of Tb3+ ions are quenched by the inert fluorescent rare earth ions. 展开更多
关键词 biphenyl 4-carboxlic acid O-PHENANTHROLINE europium complex terbium complex rare earths
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Crystal Structure and Luminescence Property of Lanthanide Complexes with 2-Fluorobenzoic Acid and 2,2′-Bipyridine 被引量:4
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作者 李夏 张卓勇 宋海斌 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第5期615-618,共4页
The two compounds of [Ln(2-FBA)3·2,2'-bpy ]2(2-FBA = 2-fluorobenzoato, 2,2'-bpy = 2,2'-bipyridine, Ln = Eu(1 ), Dy(2)) were synthesized and their structures were determined by X-ray diffraction method.... The two compounds of [Ln(2-FBA)3·2,2'-bpy ]2(2-FBA = 2-fluorobenzoato, 2,2'-bpy = 2,2'-bipyridine, Ln = Eu(1 ), Dy(2)) were synthesized and their structures were determined by X-ray diffraction method. Crystallized complexes 1 and 2 are isomorphous, monoelinie system with P21/n space group. The two complexes are binuclear molecule with an inversion center. The two lanthanide ions are linked by four bridged 2-FBA ligands and each lanthanide ion is further bonded to one chelated bidentate 2-FBA ligand and one 2,2'-bipyridine molecule. The coordination number of metal ion is eight. The europium complex exhibits strong red fluorescence. ^5D0→^7Fj(j = 1 - 4) transition emission of Eu^3+ ion was observed. 展开更多
关键词 lanthanide complexes 2-fluorobenzoic acid crystal structure rare earths
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Synthesis, Characterization and Fluorescence of Terbium(Ⅲ) Complexes with Phenylglyoxylic Acid and 2,2-Dipyridine, 1,10-Phenanthroline, Triphenyl Phosphine Oxide 被引量:2
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作者 张彦辉 颜剑波 +3 位作者 裴娟 耿啸天 王云友 孙波 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第2期146-149,共4页
Three new complexes TbL3dipy (H2O)2, TbL3phen (H2O) 2 and TbL2 (TPPO) 2NO3 were synthesized (L = phenylglyoxylate ion, dipy = 2, 2-dipyridine, phen = 1,10-phenanthmline, TPPO = Triphenyl phosphine oxide). Elem... Three new complexes TbL3dipy (H2O)2, TbL3phen (H2O) 2 and TbL2 (TPPO) 2NO3 were synthesized (L = phenylglyoxylate ion, dipy = 2, 2-dipyridine, phen = 1,10-phenanthmline, TPPO = Triphenyl phosphine oxide). Elemental analysis, conductivity, IR spectra, and ^1HNMR spectra studies were performed. IR spectra indicate that the carboxylate ion of phenylglyoxylate is coordinated to the Tb(Ⅲ) ion as an unidentate ligand. In ^1HNMR, the signals of different hydrogens in phenylglyoxylate ion shift upfield. The excitation and emission spectra of the three solid complexes were recorded at morn temperature, in which the optimum excitation wavelengths are, 361.0, 359.0 and 367.0 nm for these three complexes, respectively. Four emission bands due to the ^5D4-^7Fj(j = 6, 5, 4, 3) transitions were observed for TbL3dipy(H2O)2(489.0, 545.0, 584.0, 620.0 nm) and TbL3phen(H2O)2(490.0, 544.0, 583.0, 620.0 nm). Under the same conditions, only one emission band due to the ^5D4-^7F5 transition was observed for the complex TbL2(TPPO)2NO3. The emission intensity of TbL3dipy(H2O)2 is the strongest among the three complexes. 展开更多
关键词 TERBIUM complexES phenylglyoxylic acid IR spectra fluorescence spectra rare earths
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Thermochemical Study on Coordination Complex of Samarium with Salicylic Acid and 8-Hydroxyquinoline 被引量:2
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作者 魏得良 李强国 +5 位作者 黄熠 李旭 叶丽娟 肖圣雄 杨德俊 刘义 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第2期253-256,共4页
The coordination complex Sm(C7H5O2)2·(C9H6NO), synthesized from the reaction of samarium chloride sixhydrate with salicylic acid and 8-hydroxyquinoline, was characterized with IR, elemental analysis, molar co... The coordination complex Sm(C7H5O2)2·(C9H6NO), synthesized from the reaction of samarium chloride sixhydrate with salicylic acid and 8-hydroxyquinoline, was characterized with IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [ SmCl3·6H2O (s) ], [ 2C7H6O3 (s) ], [ C9H7NO ( s ) ] and [ Sm (C7H5O3) 2·( C9H6NO ) ( s ) ] in the calorimetric solvent were determined with the solution-reaction isoperibol calorimeter at 298.15 K to be △sHm^- [ SmCl3·6H2O (s), 298.15 K ] = - 103.98 ± 0.04 kJ·mol^-1, △sHm^- [2 C7H6O3 (s), 298.15 K] = 16.35±0.14 kJ·mol^-1,△sHm^-[C9H7NO (s), 298.15 K] = -6.11±0.08 kJ·mol^-1 and △sHm^-[Sm(C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 130.08 ± 0.04 kJ·mol^-1, respectively. The enthalpy was determined to be △rHm^- = 89.59 ±0.18 kJ·mol^-1 for the reaction SmCl3·6H2O(s) + 2C7H6O3(s) + C9H7NO(s) = Sm (C7H5O3) 2·(C9H6NO) ( s ) + 3HCl (g) + 6H2O ( l ). According to the above results and the data given in literature and through Hess' law, the standard molar enthalpy of formation of Sin( C7H5O3 )2·(C9H7NO)(s) was estimated to be △rHm^- [ Sm (C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 2055.9 ± 3.03 kJ·mol^-1. 展开更多
关键词 samarium complex salicylic acid 8-HYDROXYQUINOLINE standard molar enthalpies of formation rare earths
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