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Title: Isolation and characterization of two isomeric arylamine substituted triazinium salts. Studies of intramolecular charge-transfer and electrochromic properties
Authors: Sinan, Mominul
Ghosh, Pradip
Goswami, Sreebrata
Keywords: Positional isomers;Donor-acceptor molecules;Perchlorates;Triazinium cations;X-ray structures;Redox properties;Electrochromic properties
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Reaction of 9,10-diaza-4a-azonia-phenanthrene perchlorate ([1]ClO4) with para-toludine in acetonitrile at room temperature affords isomeric triazinium compounds (para isomer, [2a]ClO4, 6-p-tolylamino-9,10-diaza-4a-azonia-phenanthrene perchlorate and ortho isomer, [2b]ClO4, 8-p-tolylamino-9,10-diaza-4a-azonia-phenanthrene perchlorate) in moderate yields. X-ray structures of the compounds are reported. The isolated compounds have been characterized by different spectroscopic techniques. The compounds belong to the category of ‘donor-acceptor molecules’ and absorb strongly in the visible region. Positioning effect on intramolecular charge transfer process on these isomeric compounds has been investigated. Comparative studies of the spectral, redox and structural properties of the reference isomeric compounds are discussed. Notably the colour of the para isomer (red) is distinctly different than that of the ortho isomer (blue). These compounds undergo chemically reversible reductions producing azo based free radicals. Electrochromic properties of the compounds are investigated.
Page(s): 1273-1280
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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