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Cover Picture: N ‐Arylated 3,5‐Dihydro‐4 H ‐dinaphtho[2,1‐ c :1′,2′‐ e ]azepines: Axially Chiral Donors with High Helical Twisting Powers for Nonplanar Push–Pull Chromophores (Chem. Eur. J. 36/2009)
Author(s) -
Frank Brian B.,
Camafort Blanco Berta,
Jakob Samuel,
Ferroni Fiammetta,
Pieraccini Silvia,
Ferrarini Alberta,
Boudon Corinne,
Gisselbrecht JeanPaul,
Seiler Paul,
Spada Gian Piero,
Diederich François
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200990137
Subject(s) - chromophore , intramolecular force , crystallography , stereochemistry , materials science , chemistry , photochemistry
Strong induction observed for push–pull chromophores. In their Full Paper on page 9005 ff. , F. Diederich, G. P. Spada et al. discuss the strong cholesteric induction as well as the intramolecular charge‐transfer interactions observed for non‐planar push–pull chromophores, which are formed by chiral dinaphthazepine donor moieties and 1,1,4,4‐tetracyanobuta‐1,3‐diene acceptors. The background of the picture shows a cholesteric phase obtained by doping nematic E7 with a chiral push–pull chromophore; the sample has a “fingerprint” texture and is viewed with polarized light.