Synthesis and study of N,N-disubstituted 4-aminophenylazobenzaldehydes

A series of N , N -disubstituted 4-aminophenylazobenzaldehydes (azo dyes) were synthesized by the reaction of phenylpiperazine derivatives with 4-formylbenzenediazonium tetrafluoroborate. The salt was easily prepared by reacting poly(aminobenzaldehyde) with sodium nitrite in the presence of tetraflu...

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Bibliographic Details
Published in:Liquid crystals 2002-11, Vol.29 (11), p.1477-1482
Main Authors: Lai, Long-Li, Lin, Yu-Jen, Ho, Chia-Husan, Wang, Eshin, Liu, Yi-Hung, Wang, Yu, Lin, Yang-Chu, Cheng, Kung-Lung
Format: Article
Language:English
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Summary:A series of N , N -disubstituted 4-aminophenylazobenzaldehydes (azo dyes) were synthesized by the reaction of phenylpiperazine derivatives with 4-formylbenzenediazonium tetrafluoroborate. The salt was easily prepared by reacting poly(aminobenzaldehyde) with sodium nitrite in the presence of tetrafluoroboric acid. A representative sample was studied by crystallography, and the charge distribution of the molecule was calculated with the aim of understanding the form of molecular stacking on the basis of crystal data. The mesogenic behaviour of the azo dyes was also studied.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290260372673