AN OPTICAL AND SPECTROELECTROCHEMICAL INVESTIGATION OF INDIGO CARMINE

被引：11

作者：

SHEN, B ^{[1
]}

OLBRICHSTOCK, M ^{[1
]}

POSDORFER, J ^{[1
]}

SCHINDLER, RN ^{[1
]}

机构：

[1] UNIV KIEL,INST PHYS CHEM,W-2300 KIEL 1,GERMANY

来源：

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS | 1991年 / 173卷

关键词：

UV-SPECTROSCOPY; INDIGO CARMINE; SPECTROELECTROCHEMISTRY;

D O I：

10.1524/zpch.1991.173.Part_2.251

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The existence of a monomer-dimer equilibrium for indigo carmine was found in the concentration range < 3 mM in aqueous solution. The extinction coefficients at lambda = 608 nm of the monomer, epsilon(M) = 15000 M-1 cm-1, and of the dimer, epsilon(D) = 18500 M-1 cm-1, were calculated from uv-vis spectroscopic data, and a value of K(D) = 4 . 10(-4) M in 0.1 N H2SO4 was obtained for the equilibrium constant. The diffusion coefficient of the monomer, D(M) = 0.95(+/- 0.3) . 10(-5) cm2 s-1, was determined in a spectroelectrochemical experiment.

引用

页码：251 / 255

页数：5

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