A simple, novel method for the preparation of polymer-tetherable, zwitterionic merocyanine NLO-chromophores
作者:A. J. Kay、A. D. Woolhouse、G. J. Gainsford、T. G. Haskell、T. H. Barnes、I. T. McKinnie、C. P. Wyss
DOI:10.1039/b008316j
日期:——
A suite of polymer-ready nonlinear optical merocyanines has been
synthesised and characterised. The tethering functionality—a vicinal
dihydroxypropyl residue—is introduced onto the donor nitrogen of the
chromophore precursor without the need for protection/deprotection steps,
thereby giving ready access to potentially high Tg condensation
polymer systems. An X-ray crystal structure determination on a representative
chromophore 5 confirms the largely
zwitterionic nature of these systems and experimental measurements of second-order
nonlinear response [β(0)], by hyper-Raleigh
scattering, indicate that a pyridylidene donor–quinomethide acceptor
combination gives rise to the largest nonlinearity.