The first-order hyperpolarizabilities of some charge transfer conjugated molecules with high transmission in the far red

The first-order hyperpolarizabilities. pi of a number of novel merocyanine compounds bearing electron donor and acceptor groups at opposite ends of th e molecules have been determined using hyper-Rayleigh scattering. The value s of p increased with increasing strength of the electron accepters and ext ent of conjugation including the molecular moiety linking the donor and acc eptor groups. Furthermore, the non-aromatic 1.4 dihydropyridyl donor gives a greater P value than the benzothiazole donor. (C) 2001 Elsevier Science B .V. All rights reserved.