THE EQUILIBRIUM-CONSTANTS OF CADMIUM(II)-ALPHA,BETA,GAMMA,DELTA-TETRAKIS(1-METHYLPYRIDINIUM-4-YL)PORPHINE, LEAD(II)-ALPHA,BETA,GAMMA,DELTA-TETRAKIS(1-METHYLPYRIDINIUM-4-YL)PORPHINE, MAGNESIUM(II)-ALPHA,BETA,GAMMA,DELTA-TETRAKIS(1-METHYLPYRIDINIUM-4-YL)PORPHINE, AND ZINC(II)-ALPHA,BETA,GAMMA,DELTA-TETRAKIS(1-METHYLPYRIDINIUM-4-YL)PORPHINE COMPLEXES

被引:14
|
作者
IGARASHI, S [1 ]
SUZUKI, H [1 ]
YOTSUYANAGI, T [1 ]
机构
[1] TOHOKU UNIV,FAC ENGN,DEPT MOLEC CHEM & ENGN,SENDAI,MIYAGI 980,JAPAN
关键词
D O I
10.1016/0039-9140(95)01564-R
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The equilibrium constants of alpha,beta,gamma,delta-tetrakis(1-methylpyridinium-4-yl)porphine (TMPyP) complexes of cadmium(II), lead(II), magnesium(II), and zinc(II) were spectrophotometrically determined using the absorption spectra at the Soret ban and the fluorescence spectra. The values of the following constants at 25 degrees C and ionic strength 0.1 M were evaluated: K-Pb-P=10(-8.07+/-0.09), K-Cd-P=10(-7.68+/-0.03), K-Zn-P=10(1.72+/-0.08), and K-Mg-P=10(-1.40+/-0.08) by the acid hydrolysis reaction of the TMPyP-metal complex at various pHs; K-Pb-P=10(-7.80+/-0.04) and K-Cd-P=10(-7.38+/-0.004) were determined by the ligand exchange reaction between TMPyP and nitrilotriacetic acid.
引用
收藏
页码:1171 / 1177
页数:7
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