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Steric and Electronic Effects in Basic Dyes
Author(s) -
Gandhi Sham S.,
Hallas Geoffrey,
Thomasson Jeffrey
Publication year - 1977
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1977.tb03318.x
Subject(s) - steric effects , electronic effect , chemistry , ring (chemistry) , absorption (acoustics) , malachite green , photochemistry , absorption spectroscopy , crystallography , intensity (physics) , stereochemistry , organic chemistry , optics , physics , adsorption
Absorption spectra of nine derivatives of Malachite Green containing two or three methoxy groups in the phenyl ring have been examined. In the absence of varying steric effects an excellent additive relationship is found between the electronic effects of the substituents and the position of the first electronic absorption band. Conformational changes brought about by crowding substituents are detected by an increase in intensity of the first band accompanied by a decrease in intensity of the second band.