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1,3-二甲基硫脲对冷轧钢在柠檬酸溶液中的缓蚀性能
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作者 蒋宗会 邓书端 +2 位作者 徐娟 雷然 李向红 《化学研究与应用》 CAS 北大核心 2024年第9期2008-2016,共9页
通过失重法、动电位极化曲线、电化学阻抗谱(EIS)、扫描电子显微镜(SEM)和接触角测试研究了1,3-二甲基硫脲(DMTU)在1.0 mol·L^(-1)柠檬酸(H_(3)C_(6)H_(5)O_(7))溶液中对冷轧钢(CRS)的缓蚀性能。实验数据表明,在40℃时,DMTU的最大... 通过失重法、动电位极化曲线、电化学阻抗谱(EIS)、扫描电子显微镜(SEM)和接触角测试研究了1,3-二甲基硫脲(DMTU)在1.0 mol·L^(-1)柠檬酸(H_(3)C_(6)H_(5)O_(7))溶液中对冷轧钢(CRS)的缓蚀性能。实验数据表明,在40℃时,DMTU的最大缓蚀率高达94.74%,且随温度的升高亦能保持优良的缓蚀性能。DMTU在CRS表面的吸附符合Langmuir吸附等温式。DMTU属于以阴极抑制为主的混合型缓蚀剂,添加DMTU后电荷转移电阻显著增大,缓蚀作用增强。且通过SEM与接触角对CRS进行表面分析,加入DMTU缓蚀后,粗糙程度明显减小和接触角增大,DMTU能够有效吸附在CRS表面,达到缓蚀效果。 展开更多
关键词 1 3-二甲基硫脲 冷轧钢 柠檬酸 吸附 机理
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癌症患者临终阶段特点及血液指标分析 被引量:1
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作者 秦涛 蒋宗惠 王维飞 《海南医学》 CAS 2019年第4期502-505,共4页
目的探讨癌症患者临终阶段特点及血液指标情况。方法回顾性分析滁州市第一人民医院肿瘤科2014年3月至2018年4月住院期间死亡的133例晚期癌症患者的临床资料。结果 (1)肿瘤患者死亡时间有一定规律,在卯时死亡风险较高,申时死亡风险相对... 目的探讨癌症患者临终阶段特点及血液指标情况。方法回顾性分析滁州市第一人民医院肿瘤科2014年3月至2018年4月住院期间死亡的133例晚期癌症患者的临床资料。结果 (1)肿瘤患者死亡时间有一定规律,在卯时死亡风险较高,申时死亡风险相对较低。(2)临终症状表现,有26.3%的肿瘤患者神志不清;在神志清楚的患者中,疼痛症状发生率较高,达61.2%,其次为疲乏(57.1%)、胸闷气喘或呼吸困难(53.1%)等。(3)在死亡患者中统计发现,有39.1%的肿瘤患者有高血压病史,16.9%的肿瘤患者有糖尿病史。(4)晚期肿瘤患者死亡时仍有36.8%的患者家属要求积极抢救,且晚期肿瘤患者发生猝死风险达10.5%。(5)晚期肿瘤患者的白细胞、血小板、血红蛋白、中性粒细胞比率、血钾、血钠、血氯、血钙、谷丙转氨酶、谷草转氨酶、总胆红素、白蛋白、尿素均显著异常于正常人群,且差异均有统计学意义(P<0.05)。结论癌症患者临终阶段表现及血液学检查均有一定特点,加强对癌症患者临终阶段特点的认识,有利于提升临终关怀的水平,改善患者临终阶段的生活质量。 展开更多
关键词 癌症 临终阶段 临床特点 血液指标 回顾性研究
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Syntheses and Magnetism of μ-1, 3, 5-Benzenetricarboxylato Trinuclear Manganese(Ⅱ) and Nickel(Ⅱ)Complexes
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作者 SHI Jing-min LIAO Dai-zheng +2 位作者 CHENG Peng jiang zong-hui MIAO Ming-ming and WANG Geng-lin. (Department of Chemistry, Nankai University, Tianjin, 300071 ) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1996年第1期1-5,共5页
Two new manganese(Ⅱ ) trinuclear complexes and two new nickel (Ⅱ) trinuclear compIexes, namely, [Mn3 (BZT ) (Phen )6] (ClO4 )3 (complex 1 ), [Mn (BZT)· (Nphen )6] (ClO4 )3 (complex 2), [Ni3 (BZT) (Phen)6] (ClO4... Two new manganese(Ⅱ ) trinuclear complexes and two new nickel (Ⅱ) trinuclear compIexes, namely, [Mn3 (BZT ) (Phen )6] (ClO4 )3 (complex 1 ), [Mn (BZT)· (Nphen )6] (ClO4 )3 (complex 2), [Ni3 (BZT) (Phen)6] (ClO4 )3· 5H2O (complex3) and [Ni3 (BZT ) (Nphen )6] (ClO4 )3 (complex 4 ) (BZT = 1, 3, 5-benzenetricarboxylato, Phen = 1, 10-phenthroline, Nphen = 5-nitro-1, 10-phenanthroline )have been synthesized. The complexes were characterized using elemental analysis,IR and electronic reflection spectra. These complexes are proposed to have extended 1, 3, 5-benzenetricarboxylato-bridged structure and to consist of three manganese (Ⅱ) or three nickel(Ⅱ). The X-band ESR spectra of the complex 1 and complex 2were recorded at room temperature. The variable-temperature magnetic susceptibilities of complex 1 and complex 3 were measured over 4. 2-300 K. According to experimental results of the variable-temperature magnetic susceptibility, the magnetic interaction between the paramagnetic centers is too weak to be detected using the usual magnetic susceptibility technique. 展开更多
关键词 Manganese (Ⅱ) complex Nickel (Ⅱ) complex 1 3 5-benzenetricarboxylic acid MAGNETISM
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Synthesis and One-dimensional Structure of Cobalt(Ⅱ) Complex [(NaOC_2H_5)CoL_2]_n
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作者 LI Ling GU Wen +4 位作者 YAN Shi-ping CHENG Peng LIAO Dai-zheng jiang zong-hui SHEN Pan-wen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2003年第4期379-382,共4页
The treatment of bis(2-hydroxybenzyl)-amine(HL) with NaOH and Co(Ⅱ)(NO) 2 gives isostructural one-dimensional coordination polymers [(NaOC2H5)CoL2]n(1). The cobalt ions have an octahedral geometry and are coordinate... The treatment of bis(2-hydroxybenzyl)-amine(HL) with NaOH and Co(Ⅱ)(NO) 2 gives isostructural one-dimensional coordination polymers [(NaOC2H5)CoL2]n(1). The cobalt ions have an octahedral geometry and are coordinated by two crystallographically independent ligands which are further linked by μ -O\-\{phenol\} bridged Co and Na atoms to give a one-dimentional structure. 展开更多
关键词 Crystal structure SODIUM Cobalt complex One\|dimension Bis(2-hydroxybenzyl)amine
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Synthesis and Crystal Structure of a 1-D Coordination Polymer {[Cu(NIT4py)_2(ip)]·6H_2O}_n
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作者 WANG Shu-Ping GAO Dong-Zhao +3 位作者 LIAO Dai-Zheng jiang zong-hui YAN Shi-Ping LI Li-Cun 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2006年第2期214-218,共5页
A new complex { [Cu(NIT4py)2(ip)]·6H2O }, (NIT4py=2-(4"-pyridinyl)-4,4,5,5-tetra methylimidazoline-1-oxyl-3-oxide and ip = isophthalate dianion) has been synthesized and structurally characterized by X-r... A new complex { [Cu(NIT4py)2(ip)]·6H2O }, (NIT4py=2-(4"-pyridinyl)-4,4,5,5-tetra methylimidazoline-1-oxyl-3-oxide and ip = isophthalate dianion) has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in orthorhombic, space group Cmcm with a = 25.161(3), b =10.045(1), c = 15.450(2) A°, C32H48N6O14CU, Mr = 804.30, V= 3904.8(8) ,A°^3, Z = 4, De = 1.368 g/cm^3, μ(MoKa) = 0.630 mm^-1, F(000) = 1692, the final R = 0.0326 and wR = 0.0787 for 1843 independent reflections with Rint = 0.0372. Each Cu(Ⅱ) ion is four-coordinated by two carboxylate oxygen atoms and two pyridyl-N atoms from NIT4py radicals to furnish a rhombus geometry. The central Cu(Ⅱ) ion is located at an inversion center and a crystallographic two-fold axis. Each isophthalate dianion binds two Cu(Ⅱ) ions in bis-monodentate mode, leading to a 1-D chain, a' these 1-D chains are further linked into a 2-D network via hydrogen-bonding interactions. 展开更多
关键词 crystal structure nitronyl nitroxide radical copper(Ⅱ) coordination polymer ISOPHTHALATE
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Synthesis and Crystal Structure of a New One-dimensional Zn(II) Nitronyl Nitroxide Complex Bridged by Pyridine-2,4-dicarboxylate Anion
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作者 GAO Dong-Zhao LI Li-Cun +2 位作者 LIAO Dai-Zheng jiang zong-hui YAN Shi-Ping 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2006年第6期735-739,共5页
A new one-dimensional (1-D) Zn(Ⅱ) nitronyl nitroxide complex bridged by pyridine-2,4-dicarboxylate anion, [Zn(NIT4Py)(2,4-PDA)(H2O)2], (NIT4Py = 2-(4′-pyridyl)-4,4,5,5- tetramethylimidazoline-1-oxyl-3-o... A new one-dimensional (1-D) Zn(Ⅱ) nitronyl nitroxide complex bridged by pyridine-2,4-dicarboxylate anion, [Zn(NIT4Py)(2,4-PDA)(H2O)2], (NIT4Py = 2-(4′-pyridyl)-4,4,5,5- tetramethylimidazoline-1-oxyl-3-oxide and 2,4-PDA = pyridine-2,4-dicarboxylate anion), has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 16.834(2), b = 7.4376(10), c = 18.295(3) A, β = 102.848(2)°, V = 2233.2(5) A^3, C19H23N4O3Zn, Mr = 500.78, Dc = 1.489 g/cm^3,μ(MoKa) = 1.152 mm^-1, F(000) = 1036, Z = 4, the final R = 0.0390 and wR = 0.0915 for 3234 observed reflections. In the complex, each zinc(Ⅱ) ion is six-coordinated by one nitrogen atom of the radical ligand (NIT4Py), one nitrogen atom and two oxygen atoms of two 2,4-PDA anions and two oxygen atoms of two water molecules. Each 2,4-PDA anion bridges two Zn(Ⅱ) ions via a tridentate mode into a 1-D chain, and these 1-D chains are further linked into a 2-D network via hydrogen-bonding interactions. 展开更多
关键词 zinc(Ⅱ) complex nitronyl nitroxide radical crystal structure pyridine-2 4-dicarboxylic acid
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Synthesis and Crystal Structure of a New Zn(II) Nitronyl Nitroxide Complex [Zn(NIT4Py)(PDA)(H_2O)_3]
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作者 GAO Dong-Zhao WANG Shu-Ping +4 位作者 CHEN Jin LI Li-Cun LIAO Dai-Zheng jiang zong-hui YAN Shi-Ping 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2006年第2期224-228,共5页
A new Zn(Ⅱ) nitronyl nitroxide complex [Zn(NIT4Py)(PDA)(HzO)3] (NIT4Py = 2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, H2PDA = pyridine-2,5-dicarboxylic acid) has been synthesized and str... A new Zn(Ⅱ) nitronyl nitroxide complex [Zn(NIT4Py)(PDA)(HzO)3] (NIT4Py = 2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, H2PDA = pyridine-2,5-dicarboxylic acid) has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P2 1/c with a = 16.881(8), b = 7.356(4), c = 18.857(9) A°,β = 108.616(6)°, V = 2219.1 (19)A°^3 ,C 19H25N4O9Zn, Mr = 518.80, Dc = 1.553 g/cm^3, μ(MoKa) = 1.165 mm^-1, F(000) = 1076, Z = 4, the final R = 0.0269 and wR = 0.0715 for 3193 observed reflections with I 〉 2σ(I). The complex exists as discrete mononuclear molecules and the zinc(Ⅱ) ion is six-coordinated with one radical ligand (NIT4Py), one bidentate pyridine-2,5-dicarboxylate anion and three water molecules. A three-dimensional network structure is formed through the intermolecular interactions. 展开更多
关键词 zinc(Ⅱ) complex nitronyl nitroxide radical crystal structure intermolecularinteraction
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Synthesis, Crystal Structure and Optical Properties of a New Nd(III) Nitronyl Nitroxide Complex [Nd(NIT2Py)_2(NO_3)_3]
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作者 LI Dong-Jiao GAO Dong-Zhao +3 位作者 LI Li-Cun LIAO Dai-Zheng jiang zong-hui YAN Shi-Ping 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第8期905-908,共4页
A new Nd(Ⅲ) nitronyl nitroxide complex [Nd(NIT2Py)2(NO3)3] (NIT2Py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide) has been synthesized and structurally characterized by X-ray diffraction. ... A new Nd(Ⅲ) nitronyl nitroxide complex [Nd(NIT2Py)2(NO3)3] (NIT2Py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide) has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.396(4), b =11.134(4), c = 23.360(7) A°, β = 98.178(6)°, V= 3191.2(18) A°^3, C24H32N9NdO13, Mr = 798.83, Dc =1.663 g/cm^3, μ(MoKa) = 1.704 mm^-1, F(000) = 1612, Z = 4, the final R = 0.0425 and wR = 0.0957 for 6532 independentreflections with Rint = 0.0642 and 4552 observed reflections (I 〉 2σ(I)). The complex exists as discrete mononuclear molecules and the neodymium(Ⅲ) ion is ten-coordinated with three bidentate nitrate anions and two radical ligands (NIT2Py) via bidentate chelating mode.The optical properties of the complex are discussed. 展开更多
关键词 neodymium(Ⅲ)complex nitronyl nitroxide radical crystal structure optical properties
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Synthesis and Crystal Structure of Squarate Complex [CuLaSm(C_4O_4)_4(H_2O)_(16)]·2H_2O
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作者 Shi Jing-Min Yan Shi-Ping +4 位作者 Liao Dai-Zheng jiang zong-hui Wang Geng-Lin (Department of Chemistry, Nankai University, Tianjin, China, 300071 )(National Laboratory of Coordination Chemistry, Nanjing University, China) Wang Ru-Ji Wang Hong-Gen Yao Xin-Kan 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1995年第2期102-107,共6页
CuLaSm(C4O4 )4(H2O)16]·2H2O was obtained as a single crystal from a mixture of squaric acid, lanthanum chloride, samarium chloride, and copper chloride in water. The complex crystallized in the monoclinic system,... CuLaSm(C4O4 )4(H2O)16]·2H2O was obtained as a single crystal from a mixture of squaric acid, lanthanum chloride, samarium chloride, and copper chloride in water. The complex crystallized in the monoclinic system, space group P2_1,with a=6. 728(1) . b=32. 117(9),c=8. 150(1) A ,β=111. 60(1),Z=2, M_r=1125. 24, V= 1637(1 ) A3, Dc= 2. 28g/cm3, μ(MoKα) = 38. 36 cm-1, F(000)= 1104, R= 0. 040 for 2823 independent observed reflections. The coordinated environments of the lanthanides are a 4-capped square antiprism and a 4,4, 4-tricapped trigonal prism, and that of the copper is a distorted octahedron. The complex is the first example that contains copper and two kinds of different lanthanides when the squarate is employed as the ligand. 展开更多
关键词 rare earth complex squarate crystal structure model of intermediate for high -Tc superconductors
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Synthesis and Crystal Structure of a Complex Bimetallic Salt [Ni(trans_[14]diene)] [Ni (mnt)_2]
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作者 WANG Hong-Mei LI Li-Cun +4 位作者 SUN Bai-Wang LAIO Dai-Zheng jiang zong-hui YAN Shi-Ping WANG Geng-Lin(Deparment of Chemistry, Nankai University, Tianjin 300071)YU Kai-Bei(Chengdu Center of Analysis and Measurement, the Chinese Academy of Sciences,Chengdu 610 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1998年第4期289-292,共4页
The title compound has been synthesized by the reaction of [Ni(trans[14]diene)]I2 with Na[Ni(mnt)2] in water and THF, where [trans[14]diene]= 5, 7,7, 12, 14, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradeca-4, 11-dien... The title compound has been synthesized by the reaction of [Ni(trans[14]diene)]I2 with Na[Ni(mnt)2] in water and THF, where [trans[14]diene]= 5, 7,7, 12, 14, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradeca-4, 11-diene and mnt2- = cis-1, 2-dicyano-1,2-ethylenedithiolato. Its crystal structure has been determined by X-raycrystallography analysis with 4827 independent reflections (Fo>4σ(F0). The bimetallic complex salt [Ni (trans [14] diene )] [Ni (mnt )2] (C24 H32N8Ni2S4, Mr = 678. 24 )crystallizes in the triclinic system with space group P1, a = 9. 2911 (9), b= 11. 7075(12), c=15. 799(2) A, α=68. 384(7), β=79. 324(7), γ=67. 581(6)°, V=1474. 9(3) A3, Dc=1. 527 Mg/m3, Z=2, λ=0. 71073 A, μ=1. 589mm-1, F(000) =704,R=0. 0367. The structure consists of slightly distorted Square planar units [Ni(trans[14]diene)]2+ and [Ni(mnt)2]2-. 展开更多
关键词 crystal structure nickel complex synthesis bimetallic salt
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