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Synthesis, crystal structure studies and solvatochromic behaviour of two 2‐{5‐[4‐(dimethylamino)phenyl]penta‐2,4‐dien‐1‐ylidene}malononitrile derivatives
Author(s) -
Bogdanov Georgii,
Tillotson John P.,
Khrustalev Victor N.,
Rigin Sergei,
Timofeeva Tatiana V.
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619010398
Subject(s) - malononitrile , solvatochromism , chemistry , crystal structure , medicinal chemistry , organic chemistry , molecule , catalysis
The synthesis, crystal structure studies and solvatochromic behavior of 2‐{(2 E ,4 E )‐5‐[4‐(dimethylamino)phenyl]penta‐2,4‐dien‐1‐ylidene}malononitrile, C 16 H 15 N 3 (DCV[3]), and 2‐{(2 E ,4 E ,6 E )‐7‐[4‐(dimethylamino)phenyl]hepta‐2,4,6‐trien‐1‐ylidene}malononitrile, C 18 H 17 N 3 (DCV[4]), are reported and discussed in comparison with their homologs having a shorter length of the π‐conjugated bridge. The compounds of this series have potential use as nonlinear materials with second‐order effects due to their donor–acceptor structures. However, DCV[3] and DCV[4] crystallized in the centrosymmetric space group P 2 1 / c which excludes their application as nonlinear optical materials in the crystalline state. They both crystallize with two independent molecules having the same molecular conformation in the asymmetric unit. The series DCV[1]–DCV[4] demonstrated reversed solvatochromic behavior in toluene, chloroform, and acetonitrile.