Second-order nonlinear optical properties of stilbene, benzylideneaniline and azobenzene derivatives. The effect of π-bridge nitrogen insertion on the first hyperpolarizability
Abstract
The second-order nonlinear optical (NLO) and electronic properties of
stilbenes (C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C bridge), benzylideneanilines
(CN and NC bridges) and azobenzenes
(NN bridge) containing either an
N,N-dimethylamino donor and/or a
nitro acceptor were investigated using EFISH, UV spectroscopy, cyclic
voltammetry and PPP/SCF calculations. It appeared that although first
hyperpolarizabilities of the ethylene and azo bridged
donor–acceptor compounds are of comparable magnitude, substitution
of one carbon by a nitrogen atom reduces the NLO activity. Differences
in hyperpolarizabilities were rationalized with the aid of a two-level
model, which revealed that they find their origin in the redox activity
of the nitrogen-containing bridges.
C bridge), benzylideneanilines
(CN and NC bridges) and azobenzenes
(NN bridge) containing either an
N,N-dimethylamino donor and/or a
nitro acceptor were investigated using EFISH, UV spectroscopy, cyclic
voltammetry and PPP/SCF calculations. It appeared that although first
hyperpolarizabilities of the ethylene and azo bridged
donor–acceptor compounds are of comparable magnitude, substitution
of one carbon by a nitrogen atom reduces the NLO activity. Differences
in hyperpolarizabilities were rationalized with the aid of a two-level
model, which revealed that they find their origin in the redox activity
of the nitrogen-containing bridges.
Please wait while we load your content...
