title: D-π-A Compounds with Tunable Intramolecular Charge Transfer Achieved by Incorporation of Butenolide Nitriles as Acceptor Moieties.
abstract: Chromophores where a polyenic spacer separates a 4H-pyranylidene or benzothiazolylidene donor and three different butenolide nitriles have been synthesized and characterized. The role of 2(5H)-furanones as acceptor units on the polarization and the second-order nonlinear (NLO) properties has been studied. Thus, their incorporation gives rise to moderately polarized structures with NLO responses that compare favorably to those of related compounds featuring more efficient electron-withdrawing moieties. Derivatives of the proaromatic butenolide PhFu show the best nonlinearities. Benzothiazolylidene-containing chromophores present less alternated structures than their pyranylidene analogues, and, unlike most merocyanines, the degree of charge transfer does not decrease on lengthening the π-bridge.
authors.forename: Carlos
authors.initials: C
authors.lastname: Moreno-Yruela
authors.forename: Javier
authors.initials: J
authors.lastname: Garín
authors.forename: Jesús
authors.initials: J
authors.lastname: Orduna
authors.forename: Santiago
authors.initials: S
authors.lastname: Franco
authors.affiliation: Departamento de Química Física, Universidad de Málaga , Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: Estefanía
authors.initials: E
authors.lastname: Quintero
authors.affiliation: Departamento de Química Física, Universidad de Málaga , Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: Juan T
authors.initials: JT
authors.lastname: López Navarrete
authors.affiliation: Servicio de Rayos X y Análisis por Fluorescencia, Universidad de Zaragoza , 50009 Zaragoza, Spain.
authors.forename: Beatriz E
authors.initials: BE
authors.lastname: Diosdado
authors.forename: Belén
authors.initials: B
authors.lastname: Villacampa
authors.affiliation: Departamento de Química Física, Universidad de Málaga , Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Casado
authors.forename: Raquel
authors.initials: R
authors.lastname: Andreu