Spectrophotometric Studies of 3- and 5-Substituted 1-(4′-Dimethylaminobenzylideneamino)-2-methylpyridinium Perchlorates
作者:
Ryszard Gawinecki,
期刊:
Spectroscopy Letters
(Taylor Available online 1992)
卷期:
Volume 25,
issue 7
页码: 893-899
ISSN:0038-7010
年代: 1992
DOI:10.1080/00387019208018202
出版商: Taylor & Francis Group
关键词: 1-(Benzylideneamino)pyridinium salts;electronic spectra;steric effect
数据来源: Taylor
摘要:
Methyl groups in positions 2 and 6 of pyridine ring shift the long-wavelength band in the spectra of 3-substituted 1-(4′-dimethylaminobenzylideneamino) pyridinium salts towards shorter waves. The intensity of that band depends on nature of the substituent for 2-methyl derivatives, whereas a little hyperchromic effect was observed for the compounds carrying 6-methyl group. Linear dependencies were found between the band parameters and [sgrave] Hammett constants. Substituent effects on the band position in the spectra of 2-methyl-3-substituted compounds were weakened by the methyl groups present. It does not interact sterically with the substituent in position 3 of the pyridine ring.
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