利用络合物形成曲线设计金属络合物体系模型及优化络合物稳定常数
In this paper the Bi (Ⅲ) -ligand(pyridine-2-carboxylic acid) system was studied by direct current sampledpolarography (DC_TAST) at a fixed ratio of total-ligand to total-metal concentration and changing pH. The po-larographic experimental complex formation curve (ECFC) and the theoretical complex formation curve (TCFC)were used for modelling the metal-ligand system and optimizing stability constants. The ECFC, in which experi-mental parameters of polarography are included (a shift in a half-wave potential and a variation in a diffusioncontrolled limiting current), appears to be a characteristic function for a particular metal-ligand system. The TCFCis a theoretical curve calculated for the designed metal-ligand model from mass-balance equation. Five bismuthcomplexes MHL, ML, ML2, ML3 and ML3(OH) with their stability constants as logβ 7.54 ±0. 10, 7.50 ±0.02,13.91 +0. 04, 18.15 ±0. 03 and 26.75 ±0. 02, respectively, are reported.
作 者： 张建民 石秋芝 作者单位： 郑州大学化学系,郑州,450052 刊 名： 无机化学学报 ISTIC SCI PKU 英文刊名： CHINESE JOURNAL OF INORGANIC CHEMISTRY 年，卷(期)： 2003 19(4) 分类号： O614.53+2 O641.4 关键词： 金属络合物体系 稳定常数 计算机分析程序 铋 邻吡啶甲酸 metal complex system stability constant computer analytical program bismuth pyridine-2-carboxylic acid