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Visible light-induced synthesis of biomass-derived quinoxaline by using Co phthalocyanine immobilized on pyridine-doped g-C_(3)N_(4)
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作者 Mingren Jin Seyed Mohsen Sadeghzadeh Jinzhu Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第7期638-652,I0013,共16页
Visible light-driven valorization of biomass has recently been a pioneering field for nitrogen-containing heterocyclics syntheses due to its sustainable features.Herein,various aromatic ring-doped g-C_(3)N_(4) nanoshe... Visible light-driven valorization of biomass has recently been a pioneering field for nitrogen-containing heterocyclics syntheses due to its sustainable features.Herein,various aromatic ring-doped g-C_(3)N_(4) nanosheets(Ar-g-C_(3)N_(4);Ar=Py,Pm,Ph)were precisely designed to modulate their intrinsic electronic and band structure,which involves pyridine(Py),pyrimidine(Pm),and benzene(Ph)-doped g-C_(3)N_(4).Photocatalysts(CoPc/Ar-g-C_(3)N_(4)) of cobalt(II)phthalocyanine(CoPc)-fabricated Ar-g-C_(3)N_(4) were then developed for oxidative cyclization of furoin with 1,2-phenylenediamines for syntheses of various biomass-derived quinoxalines under visible-light irradiation.The catalytic activity(in terms of TOFs)of serial CoPc/Ar-g-C_(3)N_(4) samples increased with their transient photocurrents with CoPc/Py-g-C_(3)N_(4) as the most active one.For CoPc/Py-g-C_(3)N_(4),CoPc species functioned as both sensitizer and catalytic sites;while,doped Py led to a narrowed bandgap energy.Mechanism research further demonstrated that O_(2) was activated to superoxide radical(·O_(2)^(-)) by photoexcited high-level-energy electron(HLEE)transfer from Py-g-C_(3)N_(4) to CoPc for the subsequent aerobic oxidation. 展开更多
关键词 Biomass Functionalized carbon nitride Nitrogen-containing heterocyclics Photocatalysis quinoxaline
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Aspects on the Mechanism of the 1-Phenyl-1<i>H</i>-pyrazolo[3,4-<i>b</i>]quinoxaline Formation
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作者 Mohamed A. Mostafa Salah L. Aboulela +2 位作者 Mohammed A. E. Sallam Farida F. Louis Thorleif Anthonsen 《Green and Sustainable Chemistry》 2012年第2期71-75,共5页
Condensation of D-glucose, o-phenylenediamine and N,N-benzylphenylhydrazine hydrochloride (NNBPHH) in a one-pot reaction, or condensation of 2-(D-arabino-tetritol-1-yl) quinoxaline and NNBPHH, gave 3-(D-erythro-glycer... Condensation of D-glucose, o-phenylenediamine and N,N-benzylphenylhydrazine hydrochloride (NNBPHH) in a one-pot reaction, or condensation of 2-(D-arabino-tetritol-1-yl) quinoxaline and NNBPHH, gave 3-(D-erythro-glycerol-1- yl)-1-phenyl-1H-pyrazolo[3,4-b]quinoxaline. The structure of the latter was determined by 1H NMR spectroscopy and by synthesis using phenylhydrazine hydrochloride instead of NNBPHH. Condensation of D-glucose and 4,5-dichloro-o-phenylenediamine gave 6,7-dichloro-2-(D-arabino-tetritol-1-yl)quinoxaline, which upon condensation with NNBPHH gave the corresponding 6,7-dichloro-3-(D-erythro-glycerol-1-yl)-1-phenyl-1H-pyrazolo[3,4-b]quinoxaline. The structure and mechanism of formation of these compounds are discussed. 展开更多
关键词 2-(D-arabino-tetritol-1-yl)quinoxaline Pyrazolo[3 4-b]quinoxalines 3-(D-erythro-glycerol-1-yl)-1-phenyl-1H-pyrazolo-[3 4-b]qunoxaline 4 5-Dichloro-o-phenylenediamine 6 7-Dichloro-2-(D-arabino-tetritol-1-yl)quinoxaline 7-Dichloro-3-(D-erythro-glycerol-1-yl)-1-phenyl-1H-pyrazolo-[3 4-b]quinoxaline N N-Benzylphenylhydrazine hydrochloride
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Keggin type heteropolyacids-catalyzed synthesis of quinoxaline derivatives in water 被引量:4
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作者 Tai Kun Huang Lin Shi Rui Wang Xing Zhou Guo Xiao Xia Lu 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第2期161-164,共4页
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in exc... Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water. This method provides a new and efficient protocol in terms of small quantity of catalyst, a wide scope of substrates, and simple work-up procedure. 展开更多
关键词 Keggin type heteropolyacids 1 2-Diamines 1 2-Diketones quinoxaline derivatives WATER
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Synthesis of quinoxaline derivatives catalyzed by PEG-400 被引量:3
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作者 Zhang, Xia Zhong Wang, Jin Xian +1 位作者 Sun, Yong Jun Zhan, Hong Wen 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第4期395-398,共4页
Polyethylene glycol(PEG) was found to be an effective catalyst for the condensation of 1,2-diamines with 1,2-dicarbonyl compounds to afford the corresponding quinoxaline derivatives in excellent yields under mild reac... Polyethylene glycol(PEG) was found to be an effective catalyst for the condensation of 1,2-diamines with 1,2-dicarbonyl compounds to afford the corresponding quinoxaline derivatives in excellent yields under mild reaction conditions. 展开更多
关键词 PEG-400 quinoxaline derivatives 1 2-Diamines 2-Dicarbonyl compounds
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Combined electronic/atomic level computational, surface(SEM/EDS),chemical and electrochemical studies of the mild steel surface by quinoxalines derivatives anti-corrosion properties in 1 mol·L^(-1) HCl solution 被引量:2
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作者 F.Benhiba Z.Benzekri +6 位作者 A.Guenbour M.Tabyaoui A.Bellaouchou S.Boukhris H.Oudda I.Warad A.Zarrouk 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第5期1436-1458,共23页
This work is devoted to the study of the inhibition of corrosion of mild steel(MS)in molar hydrochloric acid(1 mol·L-1 HCl)by two named quinoxaline derivatives namely,2-(2,4-dichlorophenyl)-1,4-dihydroquinoxaline... This work is devoted to the study of the inhibition of corrosion of mild steel(MS)in molar hydrochloric acid(1 mol·L-1 HCl)by two named quinoxaline derivatives namely,2-(2,4-dichlorophenyl)-1,4-dihydroquinoxaline(HQ)and 2-(2,4-dichlorophenyl)-6-methyl-1,4-dihydroquinoxaline(CQ).The inhibitory efficacy of HQ and CQ compounds is first evaluated using the gravimetric method and using electrochemical techniques(stationary and transient techniques).The results showed that our compounds are efficient corrosion inhibitors and the inhibition rates(ηEIS%)reached up to 91%and 94.2%at 10-3 mol·L-1 for HQ and CQ,respectively.The mentioned molecules are classified as mixed-type inhibitors.The adsorption of these inhibitors on the surface of steel in hydrochloric HCl 1 mol·L-1 medium obeys the Langmuir adsorption isotherm.The results of the scanning electron microscope(SEM)showed the formation of a protective film on the surface of the steel in the presence of the inhibitors studied.Elementary analysis is obtained by energy dispersive X-ray spectroscopy(EDS).The inhibition property was further elucidated by theoretical approaches such as:Density Functional Theory(DFT),quantum chemical descriptors(QCD),local reactive indices,solvent effect,theoretical complexation,Molecular Dynamic(MD)simulation,effect of temperature on adsorption energy(Eads),Radial Distribution Function(RDF),and Mean Square Displacement(MSD).The results of these approaches support the experimental results. 展开更多
关键词 Mild steel corrosion quinoxaline derivatives Electrochemical techniques SEM/EDS MD
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Hydrothermal Syntheses and Crystal Structures of Two Metal-organic Complexes with 2,3-Pyridinedicarboxylic Acid and 2-Methyl-dipyrido[3,2-f:2',3'-h]quinoxaline Ligands 被引量:2
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作者 黄艳菊 倪良 +1 位作者 杜刚 王蕾 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第12期1857-1863,共7页
Two unusual one-dimensional(1-D) compounds,viz.[Co(Medpq)(QUI)·H2O]2n· 2.4nH2O 1 and [Cd(Medpq)(QUI)·H2O]n·nH2O 2,were synthesized by the combination of two different metallic salts and o... Two unusual one-dimensional(1-D) compounds,viz.[Co(Medpq)(QUI)·H2O]2n· 2.4nH2O 1 and [Cd(Medpq)(QUI)·H2O]n·nH2O 2,were synthesized by the combination of two different metallic salts and organic ligands,namely 2,3-pyridinedicarboxylic acid(H2QUI) and 2-methyldipyrido[3,2-f:2',3'-h]quinoxaline(Medpq) ligand.The compounds were characterized by elemental analyses,TG,fluorescent emission and single-crystal X-ray diffraction analyses. 展开更多
关键词 2 3-pyridinedicarboxylic acid 2-methyldipyrido[3 2-f:2' 3'-h]quinoxaline cobalt(Ⅱ) cadmium(Ⅱ)
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Hydrothermal Reaction, Structure and Magnetic Properties of a Binuclear Cobalt Complex with N-donor Ligand:2-Methyldipyrido[3,2-f:2ˊ3ˊ-h]quinoxaline 被引量:2
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作者 黄艳菊 闫永胜 张红妍 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第11期1580-1586,共7页
One complex [Co1.5(C6H5CHCHCOO)3(Medpq)]·H2O(C6H5CHCHCOO = cinnamic acid, Medpq = 2-methyldipyrido[3,2-f:2,3-h]quinoxaline) 1 has been hydrothermally synthesized and structurally characterized by elemental... One complex [Co1.5(C6H5CHCHCOO)3(Medpq)]·H2O(C6H5CHCHCOO = cinnamic acid, Medpq = 2-methyldipyrido[3,2-f:2,3-h]quinoxaline) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG, single-crystal X-ray diffraction and magnetic susceptibility measurements. Complex 1 crystallizes in the triclinic system, space group P1, with a = 10.224(5), b = 14.572(5), c = 15.139(5)A, α = 112.704(5), β = 97.168(5), γ = 109.749(5), V = 1871.8(13) 3 and Z = 2(at 293(2) K). In the crystal structure, the Co(1) ion is hexa-coordinated with six atoms from three different cinnamic acid ligands and the symmetric three different cinnamic acid ligands; the Co(2) center adopts a coordination environment with two nitrogen atoms from Medpq ligand and four oxygen atoms from two different cinnamic ligands, assuming a slightly distorted octahedral geometry, respectively. The negative value of the Weiss constant indicates antiferromagnetic exchange interactions between the Co ions. 展开更多
关键词 cobalt complex magnetic susceptibility measurement 2-methyldipyrido[3 2-f:2ˊ 3ˊ-h]quinoxaline
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Ga(ClO_4)_3-catalyzed Reaction of 1,2-Diamines and α-Bromoketones:Synthesis of 2-Substituted Quinoxalines 被引量:1
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作者 JI Yun-fei CHEN Tang-ming +1 位作者 MAO Hai-feng ZOU Jian-ping 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第4期642-646,共5页
Ga(ClO4)3-catalyzed reaction of 1,2-aryldiamines and α-bromoketones to afford 2-substituted quinoxalines in good yields is described.The reaction proceeded via grinding process with 10%(molar fraction) catalyst u... Ga(ClO4)3-catalyzed reaction of 1,2-aryldiamines and α-bromoketones to afford 2-substituted quinoxalines in good yields is described.The reaction proceeded via grinding process with 10%(molar fraction) catalyst under solvent-free conditions at room temperature.For unsymmetrical o-phenylenediamines bearing electron-withdrawing groups,regio-selective quinoxalines were obtained. 展开更多
关键词 Ga(ClO4)3 1 2-Aryldiamine α-Bromoketone 2-Substituted quinoxaline Solvent-free reaction
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Potential benefits of quinoxaline 1, 4-dioxides in aldosterone dysmetabolism disease—A medical hypothesis 被引量:1
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作者 Da-Jiang Zou Qiao-Feng Zheng +2 位作者 Xian-Ju Huang Xu Wang Awais Ihsan 《Open Journal of Animal Sciences》 2011年第3期121-127,共7页
Quinoxaline 1, 4-dioxides (QdNOs) are quinox-aline derivatives which have been used as an-timicrobial agents and growth promoters in animals widely. They are also assumed to cure human disease such as anticancer, anti... Quinoxaline 1, 4-dioxides (QdNOs) are quinox-aline derivatives which have been used as an-timicrobial agents and growth promoters in animals widely. They are also assumed to cure human disease such as anticancer, antitubercular and inhibiting parasite. QdNOs such as carbadox and their major metabolites induced a special decline of aldosterone production from the swine adrenal in vivo and in vitro, and thus cause hypovolemia, hyponatremia and hyperkalemia. This can also be expected to be the case for human. As a mainly physiological hormone and a novel steroid with potent mineralocorticoid activity, aldosterone plays an important role in the pathophysiological process of brain, renal and heart disease progression and may be a renal and vascular risk factor. Here, we provide evidence to support the hypothesis that QdNOs may lead potential benefits in aldosterone dysmetabolism disease via the synthesis deficiency of aldosterone in adrenal and/or the cardiovascular tissues. If the hypothesis is true, it may provide a new option into the therapy for aldosterone dysmetabolism disease, especially in cardiovascular system, and thus assume a broader application of QdNOs. 展开更多
关键词 quinoxaline 1 4-Dioxides ALDOSTERONE ADRENAL GLAND Dysmetabolism Cardiovascular Tissues
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Coordination Modes of Polypyridyl Quinoxaline with Hg(Ⅱ),Pb(Ⅱ),Co(Ⅱ)and Mn(Ⅱ) 被引量:1
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作者 赵强 沈芝 +1 位作者 杨浩 宋会珍 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第1期69-76,共8页
The interaction of metal ions(Hg^2+,Pb^2+,Co^2+,Mn^2+) with polypyridyl quinoxaline ligand 2,3,6,7,10,11-hexakis(2-pyridyl)dipyrazino[2,3-f:20,30-h]quinoxaline(HPDQ) was investigated,and four new complexes ... The interaction of metal ions(Hg^2+,Pb^2+,Co^2+,Mn^2+) with polypyridyl quinoxaline ligand 2,3,6,7,10,11-hexakis(2-pyridyl)dipyrazino[2,3-f:20,30-h]quinoxaline(HPDQ) was investigated,and four new complexes have been synthesized and characterized.Complex 1 exhibits a 0dimensional dual-core structure,2 is a one-dimensional chain structure based on a dual-core Pb unit,while 3 and 4 show a 0 dimensional single-core structural unit.Complex 1 is of monoclinic system,space group C2/c with a = 19.211(4),b = 23.896(5),c = 12.698(3) A°,β= 120.11(3)°,V= 5043.0(17)A°3,Z = 4,S = 1.053,F(000) = 2976,R^a = 0.0637 and wR^b = 0.1068(I 〉 2σ(I)).Complex 2 adopts triclinic system,space group P1 with a = 10.370(2),b = 12.195(2),c = 21.033(4) A°,α = 80.87(3),β= 81.22(3),γ = 82.38(3)°,V= 2579.3(8) A°3,Z = 2,S = 1.099,F(000) = 1328,R^a = 0.0609 and wR^b =0.1365(I 〉 2σ(I)).Complex 3 is of monoclinic system,space group Cllc with a = 14.166(3),b =16.621(3),c = 20.248(4) ?,β = 92.18(3)°,V= 4764.0(16) A°3,Z = 4,S = 1.005,F(000) = 2108,R^a =0.0589 and wR^b = 0.1332(I 〉 2σ(I)).Complex 4 belongs to the monoclinic system,space group C2/c with a = 14.404(3),b = 16.626(3),c = 20.346(4) ?,β = 92.43(3)°,V= 4868.2(17) A°3,Z = 4,S= 1.068,F(000) = 2108,R^a = 0.0833 and wR^b = 0.1591(I 〉 2σ(I)).Furthermore,the behavior of HPDQ with Hg^2+,Pb^2+,Co^2+ and Mn^2+ in the solution was also investigated,and the result shows after the metal ions were added respectively,the emission of all solutions shows fluorescence quenching and has a red shift compared with that of the HPDQ ligand. 展开更多
关键词 polypyridyl quinoxaline mercury(Ⅱ) lead(Ⅱ) cobalt(Ⅱ) manganese(Ⅱ)
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Catalyst-free and solvent-free method for the synthesis of quinoxalines under microwave irradiation
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作者 Jian Feng Zhou Gui Xia Gong +1 位作者 Kun Bao Shi San Jun Zhi 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第6期672-675,共4页
A facile procedure for the synthesis, of quinoxalines is being reported starting from benzil and 1,2-diaminobenzene. The reactions were carried out catalyst-free, solvent-free and under microwave irradiation condition... A facile procedure for the synthesis, of quinoxalines is being reported starting from benzil and 1,2-diaminobenzene. The reactions were carried out catalyst-free, solvent-free and under microwave irradiation conditions in high yield (84-98%) with short time (3-6 min) and environmental benign, as well as convenient operation. The structures of all the compounds have been confirmed on the basis of their IR, 1H NMR, and/or 13C NMR, mass spectral data. 展开更多
关键词 quinoxaline BENZIL 1 2-Diaminobenzene CATALYST-FREE SOLVENT-FREE Microwave irradiation
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Convenient Synthesis of Substituted Quinoxalines and 2H-Benzo[b][1,4]oxazines in Water
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作者 DING Chang-jiang WANG Yan +3 位作者 ZHANG Wei-wei LIU Li LIANG Yong-jiu DONG De-wen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第2期174-177,共4页
A facile and convenient synthesis method has been developed for substituted quinoxalines and 2H-benzo[b][1,4]oxazines from the reactions of a-bromoketones with benzene-1,2-diamine and 2-aminophenol, respectively, whic... A facile and convenient synthesis method has been developed for substituted quinoxalines and 2H-benzo[b][1,4]oxazines from the reactions of a-bromoketones with benzene-1,2-diamine and 2-aminophenol, respectively, which were catalyzed by tetrabutylammonium bromide(TBAB) in aqueous basic media. 展开更多
关键词 quinoxaline Benzene-l 2-diamine 2-AMINOPHENOL a-Bromoketone WATER
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SYNTHESIS AND CHARACTERIZATION OF ORGANOSOLUBLE POLYAMIDES FROM QUINOXALINE BASED DIAMINE
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作者 Hossein Mighani Mousa Ghaemy 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2010年第2期147-155,共9页
Aromatic/aliphatic polyamides were synthesized from a diamine monomer, 2,3-bis-p-aminophenylquinoxaline (IV), based on quinoxaline and various dicarboxylic acids of aliphatic, aromatic and heterocyclic. The diamine ... Aromatic/aliphatic polyamides were synthesized from a diamine monomer, 2,3-bis-p-aminophenylquinoxaline (IV), based on quinoxaline and various dicarboxylic acids of aliphatic, aromatic and heterocyclic. The diamine and polyamides were characterized by elemental analysis, FTIR and IH-NMR. The solubility of the polyamides was affected by the quinoxaline and heterocyclic groups in the polymer chain. They were all soluble in common organic solvents such as dimethylsulfoxide (DMSO), N,N-dimethylformamide (DMF) and N-methylpyrolidone (NMP). The polyamides showed inherent viscosity in the range of 0.25-0.3 dL/g in DMSO at 25℃ and good thermal stability with the char yields in the range of 65%-82% at 600℃ in nitrogen. 展开更多
关键词 quinoxaline Polyamides SOLUBILITY Thermal stability
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Structures and Spectroscopic Properties of(1)Dipyridine Quinoxaline with Hg(Ⅱ), Cu(Ⅰ) and Ag(Ⅰ)
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作者 赵强 于林涛 +2 位作者 毕冬琴 柳文敏 沈芝 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第9期1469-1476,共8页
The interaction of Hg(Ⅱ), Cu(Ⅰ) and Ag(Ⅰ) with dipyridine quinoxaline ligand 2,3-bis(2-pyridyl)quinoxaline(DPQ) were investigated, and three new complexes have been synthesized and characterized. Complex ... The interaction of Hg(Ⅱ), Cu(Ⅰ) and Ag(Ⅰ) with dipyridine quinoxaline ligand 2,3-bis(2-pyridyl)quinoxaline(DPQ) were investigated, and three new complexes have been synthesized and characterized. Complex 1 exhibits a 0D dual-core structure, complex 2 is a 0D tetra nuclear case based on a dual-core Cu unit, and complex 3 shows a one-dimensional pipeline structure. Furthermore, the optical properties of complex and DPQ were also investigated, and the results showed that the fluorescence intensity of complexes was weaker than that of ligand DPQ. 展开更多
关键词 dipyridine quinoxaline metal-organic compounds SELF-ASSEMBLY fluorescence spectrum
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Synthesis, Characterization, Anti-Bacterial and Anti-Fungal Activities of New Quinoxaline 1,4-di-N-Oxide Derivatives
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作者 Dalia Hussein Soliman 《International Journal of Organic Chemistry》 2013年第3期65-72,共8页
A new series of quinoxaline 1,4-di-N-oxides were synthesized and evaluated for their antibacterial and antifungal activities. The best result was demonstrated by 3-amino-N-(4-methoxyphenyl)-2-quinoxalinecarboxamide 1,... A new series of quinoxaline 1,4-di-N-oxides were synthesized and evaluated for their antibacterial and antifungal activities. The best result was demonstrated by 3-amino-N-(4-methoxyphenyl)-2-quinoxalinecarboxamide 1,4-di-N-oxide 4e, MIC (0.24 μg/ml) against Aspergillus fumigatus, and (0.12 μg/ml) against Streptococcus pneumonia. 展开更多
关键词 quinoxaline 1 4-di-N-Oxide Beirut Reaction Benzofuroxanes β-Ketoamide β-Cyanoamide Antibacterial Antifungal
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Molecular and electronic structure of several 2,3-dithienylquinoxalines and their 2:1 complexes with silver(I) nitrate
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作者 Guy Crundwell Stefanie Cantalupo +6 位作者 Paul D. C. Foss Brian McBurney Kristen Kopp Barry L. Westcott James Updegraff III Matthias Zeller Allen D. Hunter 《Open Journal of Inorganic Chemistry》 2014年第1期10-17,共8页
We have synthesized three bis (thienyl) quinoxalinesilver(I) complexes;however, unlike analogous silver(I) complexes of pyridylquinoxaline that utilize (N, N) bidentate behavior from the quinoxaline and pyridyl ring n... We have synthesized three bis (thienyl) quinoxalinesilver(I) complexes;however, unlike analogous silver(I) complexes of pyridylquinoxaline that utilize (N, N) bidentate behavior from the quinoxaline and pyridyl ring nitrogens, the bis(thienyl) quinoxaline ligands did not utilize the bonding potential of the thienyl rings to give (N, S) bonding modes. PES spectra modeling of these ligands indicates that the preferential metal bonding via only the quinoxaline nitrogen atoms is due to the N-rich, but S-poor, characters of the frontier orbitals. 展开更多
关键词 X-Ray Diffraction Silver(I) COMPLEXES Thiophene quinoxalineS PHOTOELECTRON Spectroscopy
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Crystal Structure and Spectroscopic Analysis of Polyphenyl Quinoxaline with Hg(Ⅱ)
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作者 赵强 沈芝 +2 位作者 杨浩 周倩 王庆红 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第8期1253-1259,共7页
The interaction of Hg^2+ with polyphenyl quinoxaline ligand 2,3,6,7,10,11-hexaphenyldipyrazino[2,3-f:2',3'-h]quinoxaline(HPQ) was investigated, and a new complex(C(49)H(32)N6Br2Cl2Hg) has been synthesized ... The interaction of Hg^2+ with polyphenyl quinoxaline ligand 2,3,6,7,10,11-hexaphenyldipyrazino[2,3-f:2',3'-h]quinoxaline(HPQ) was investigated, and a new complex(C(49)H(32)N6Br2Cl2Hg) has been synthesized and characterized. It exhibits a 0D single-core structure,and adopts triclinic P 1 space group with a = 11.139(2), b = 13.429(3), c = 14.488(3)A, α =76.10(3), β = 83.16(3), γ = 87.36(3)o, V = 2088.4(7) A^3, Z = 2, S = 1.056, F(000) = 1104, R = 0.0417 and w R = 0.0931(I 〉 2σ(I)). Furthermore, the behavior of HPQ with Hg^2+ in the solution was also investigated, and the result shows that HPQ was found to have excellent fluorescent selectivity for Hg^2+ over many other metal ions(Li^+, K^+, Na^+, Sr^+, Ca^2+, Mg^2+, Mn^2+, Fe^3+, Ni^2+, Co^2+, Cu^2+, Zn^2+,Cd^2+, Pb^2+, Al^3+ and Cr^3+) based on the intermolecular charge-transfer mechanism, which makes HPQ a potential fluorescence sensor or probe for Hg^2+. 展开更多
关键词 polyphenyl quinoxaline selectivity fluorescence spectrum ultraviolet spectrum
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Crystal Structure and Spectroscopic Analysis of Polypyridyl Quinoxaline with Ce(Ⅲ) and Nd(Ⅲ)
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作者 赵强 沈芝 +2 位作者 柳文敏 宋会珍 何泽颖 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第6期939-945,共7页
Two high coordination crystals were obtained by the interaction of Ce^(3+) and Nd^(3+) with polypyridyl quinoxaline ligand 2,3,6,7,10,11-hexakis(2-pyridyl)dipyrazino[2,3-f:20,30-h]quinoxaline(HPDQ), and the... Two high coordination crystals were obtained by the interaction of Ce^(3+) and Nd^(3+) with polypyridyl quinoxaline ligand 2,3,6,7,10,11-hexakis(2-pyridyl)dipyrazino[2,3-f:20,30-h]quinoxaline(HPDQ), and they were characterized. Complex 1 exhibits a 0 dimensional three-nuclear structure, with the three Ce(Ⅲ) atoms being ten-, eleven- and twelve-coordinated. Complex 2 is a 0 dimensional dual-core structure and the Nd(Ⅲ) atom is ten-coordinated. Complex 1 is of monoclinic system, space group P2/c with a = 16.850(3), b = 16.617(3), c = 24.017(5) ?, β = 100.94(3)o, V = 6602(2) ?~3, Z = 4, S = 1.062, F(000) = 3372, R = 0.0504 and wR = 0.1463(I 〉 2σ(I)). Complex 2 adopts a monoclinic system, space group C2/c with a = 25.795(5), b = 20.166(4), c = 13.059(3) ?, β = 112.29(3)°, V = 6286(2) ?~3, Z = 4, S = 1.004, F(000) = 2664, R = 0.0663 and wR = 0.1821(I 〉 2σ(I)). Furthermore, the behaviors of HPDQ with Ce^(3+) and Nd^(3+) in the solution are also investigated. After the Ce^(3+) is added, the ultraviolet absorption of the solution is enhanced with a red shift compared with that of the HPDQ ligand. While after adding Nd^(3+), the ultraviolet absorption of the solution is weakened, and it has a red shift which is the same as Ce^(3+). However, after the respective addition of metal ions, the emission of all solutions is quenched and has a red shift compared with that of the HPDQ ligand. 展开更多
关键词 polypyridyl quinoxaline cerium(Ⅲ) neodymium(Ⅲ) fluorescence spectrum
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Efficient Construction of Quinoxaline Derivatives by Cesium Hydroxide-Catalyzed Mild Aerobic Annulation Reaction
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作者 Huang Zhenru Jin Guoshun +5 位作者 Chen Tianyu Feng Bin Shi Xinkang Chen Minfang Hua Lusheng Xu Qing 《有机化学》 SCIE CAS CSCD 北大核心 2024年第9期2933-2942,共10页
Simple inorganic base cesium hydroxide is found to be the best catalyst for aerobic annulation reaction of o-phenylenediamine andα-hydroxy-2-phenylacetophenone in constructing the quinoxaline skeleton,i.e.,catalytic ... Simple inorganic base cesium hydroxide is found to be the best catalyst for aerobic annulation reaction of o-phenylenediamine andα-hydroxy-2-phenylacetophenone in constructing the quinoxaline skeleton,i.e.,catalytic amount of cesium hydroxide can catalyze the reaction efficiently under mild conditions of room temperature in air atmosphere.This method is extendable to a series of vicinal diamines andα-hydroxyl ketones,thus having a relatively broad substrate scope.As no transition metal catalyst is required and cesium hydroxide highly water-soluble,cesiume can be effectively removed by washing with water,the prodcuts can be obtained without cesium and transition metal residue contamination.This reaction requires no other stoichiometric oxidants but the readily available and convenient air as the oxidant,and the only byproduct is water,hence a transition metal-free,mild and efficient,green and practical approach for efficient construction of the quinoxaline derivatives is provided. 展开更多
关键词 transition metal-free cesium hydroxide catalysis quinoxaline skeleton air room temperature
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Quinoxaline-specific enantioselective sulfa-michael reaction catalyzed by chiral phosphoric acid
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作者 Xiongfei Deng Shiqi Zhang +3 位作者 Hesen Huang Xin Cui Zhuo Tang Guangxun Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第12期172-176,共5页
Highly enantioselective sulfa-Michael additions(SMA)between 2-alkenyl quinoxalines and aromatic thiols are accomplished using a low loading of chiral phosphoric acid catalyst(1 mol%).It was confirmed by an investigati... Highly enantioselective sulfa-Michael additions(SMA)between 2-alkenyl quinoxalines and aromatic thiols are accomplished using a low loading of chiral phosphoric acid catalyst(1 mol%).It was confirmed by an investigation of a lot of azaarenes that the two C-N units of quinoxalines are indispensable for controlling the reaction enantioselectivities.A series of non-terminal 2-alkenes substituted with aryls or alkyls,even other electro-withdrawing groups such as ketones,esters,or amides,selectively reacted and afforded the desired SMA products(48 examples)in good regioselectivities with high yields(up to 99%)and good ee values(up to 97%). 展开更多
关键词 Sulfa-Michaela ddition quinoxaline Chiral phosphoric acid Regioselectivity ENANTIOSELECTIVITY
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