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Synthesis, Characterization and Polarographic Behaviour of Complexes of Thenoylpyrazolone-β-alanine
Li Jinzhou, Yang Yu, Zhang Xiaorui, Yu Zhigang
Department of Chemistry, Harbin Normal University, Harbin 150080
Abstract:
An ewacylpyrazolone Schiff base and its metal complexes were synthesized. The electrochemical behaviour of complexes was studied. In non-aqueous solvent, the new Schiff base 1-phenyl-3-methyl-4-(2-thenoyl)-5-pyrazolone-2-alanine (HL) was synthesized by the reaction of 2-alanine with 1-phenyl-3-methyl-4-(2-thenoyl)-5-pyrazolone and its complexes UO2(II), Cu(II), Co(II) and Fe(II) were obtained from refluxing a solution of Schiff base and metal nitrate. The polarographic wave of Cu(II) complex was determined at 1.24V(vs.SCE) in the medium of HAc-NaAc (PH=4.6). On the basis of elemental analysis and molar conductance, the general formula of the complexes, [UO2L2]?H2O,[CuL2]?2H2O,[CoL2]?2H2O and [FeL2]?2H2O, were given. They were characterized by IR, UV-visible, 1H NMR, 13CNMR, thermal analyses and magnetic moments. The results show that the metal ions except UO2 2+ exhibit six coordination in the complexes. The peak current is produced by the reduction of Cu2+ in the copper complex, and the number of electron transfer is 1 at electrode reaction.
Key words:  Thenoylpyrazolone, 2-alanine, Complex, Polarography
FundProject:
噻吩甲酰基吡唑啉酮缩β-丙氨酸配合物的合成、表征及极谱行为
李锦州*, 杨昱, 张晓蕊, 俞志刚
哈尔滨师范大学化学系,哈尔滨,150080
摘要:
在非水溶剂中, β-丙氨酸与1-苯基-3-甲基-4-(2-噻吩甲酰基)吡唑啉酮-5反应合成新型酰基吡唑啉酮席夫碱化合物1-苯基-3-甲基-4-(2-噻吩甲酰基)吡唑啉酮-5缩β-丙氨酸(HL).通过回流席夫碱和金属硝酸盐合成了UO2(Ⅱ)、 Cu(Ⅱ)、 Co(Ⅱ)和Fe(Ⅱ)金属配合物.在乙酸-乙酸钠(pH=4.6)缓冲溶液﹑饱和甘汞电极体系中,测量电位-1.24 V处,测得铜配合物的极谱波.元素分析及摩尔电导值表明,新配合物的组成为[HO2L2]·H2O,[CuL2]·2H2O,[CoL2]·2H2O和[FeL2]·2H2O.运用红外光谱、紫外光谱、核磁共振谱、热谱和磁矩对配合物进行了表征.结果表明,配合物的中心离子(除UO22+以外)均为6配位.铜配合物的Cu2+还原产生峰电流,其电极反应转移1个电子.
关键词:  噻吩甲酰基吡唑啉酮, β-丙氨酸, 配合物, 极谱
DOI:10.1088/1674-0068/17/5/592-596
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