Functionalised diarylalkynes: a new class of Langmuir-Blodgett film materials for nonlinear optics

Abstract

A number of novel, functionalised, diarylalkynes have been prepared which are capable of forming non-centrosymmetric Langmuir-Blodgett films by Z-type deposition. The nonlinear optical behaviour of these layers has been investigated using both second-harmonic generation and surface plasmon resonance techniques.

Asymmetrie Ethynes. Syntheses of Ethynylferrocene Paradigms

“…C on sequently, the significant enhancem ent o f nonlin ear optical responses necessitates new concepts. Synthetical approaches which take this dem and into account com prise the integration o f novel substituents such as inductive and cationic ac ceptors, replacing diphenylacetylenes by (phenylethynylene)pyridinium links, (and use in LB films [12] or superlattice environm ents [13], respec tively), as well as the preparation o f oligo(ethynylenephenylene) spacers [7b,e, 14] and polym ers w ith pendent N LO -phores [15], Since ferrocene derivatives represent the m ost versatile class of organom etallic system s in the field o f nonlinear optics, the investigation o f (ferrocenylethynylene)-phenylenes instead o f diphenylacetylenes appears inviting. The donor-acceptor com pound 4 for in stance has been designed as m onom er precursor to branched polyvinyls.…”