D鈭捪€鈥揂 Compounds with Tunable Intramolecular Charge Transfer Achieved by Incorporation of Butenolide Nitriles as Acceptor Moieties
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- 作者：Carlos Moreno-Yruela ; Javier Gar铆n ; Jes煤s Orduna ; Santiago Franco ; Estefan铆a Quintero ; Juan T. L贸pez Navarrete ; Beatriz E. Diosdado ; Bel茅n Villacampa ; Juan Casado ; Raquel Andreu
- 刊名：Journal of Organic Chemistry
- 出版年：2015
- 出版时间：December 18, 2015
- 年：2015
- 卷：80
- 期：24
- 页码：12115-12128
- 全文大小：652K
- ISSN：1520-6904
文摘
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 蟺-bridge.