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Polarographische Untersuchungen an symmetrischen Triazacarbocyaninen in Methanol
Author(s) -
Hellrung Bruno
Publication year - 1983
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19830660228
Subject(s) - chemistry , coulometry , polarography , tetrafluoroborate , methanol , acetonitrile , acetic acid , lithium (medication) , medicinal chemistry , ethyl acetate , lithium chloride , inorganic chemistry , cyclic voltammetry , nuclear chemistry , organic chemistry , electrochemistry , electrode , ionic liquid , catalysis , medicine , endocrinology
Polarographic Investigations on Symmetrical Triazacarbocyanine Dyes in Methanol The reduction mechanism of eleven symmetrical triazacarbocyanine dyes with different heterocycles in methanol (containing lithium chloride or lithium acetate/acetic acid) has been investigated by means of polarography, cyclic oscillopolarography and coulometry. The reduction occurs in a reversible to irreversible two electron transfer step, followed by an irreversible chemical step. Reduction potentials, transfer coefficients and specific currents have been measured and compared with properties measured in acetonitrile. The effect of substituents X has been studied on the compounds 1‐ethyl‐2‐[3‐(1‐ethyl‐6‐X‐1,2‐dihydroquinolin‐2‐ylidene)‐1‐triazeno]‐6‐X‐quinolinium tetrafluoroborate 1f(X) and 3‐ethyl‐2‐[3‐(3‐ethyl‐5‐X‐Δ 4 ‐1, 3‐thiazolin‐2‐ylidene)‐1‐triazeno]‐5‐X‐1, 3‐thiazolium tetrafluoroborate 1g(X) , and ρ‐values of 0.20 and 0.40 V, respectively, have been found.