Y. Murthy, V. Christopher, U. Prasad
Mar 1, 2010
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Journal
Synthetic Metals
Abstract
abstract 4-substituted benzylidene-2-pheny-5-oxazolones (5 new compounds) were synthesized by both con-ventional and microwave assisted synthesis and were characterized by gas chromatography-massspectrometry (GCMS), Fourier-transform nuclear magnetic resonance (FT-NMR) spectroscopy, andFourier-transform infrared (FT-IR) spectroscopy. The synthetic methodology of these new compounds ispresented. The results of nonlinear optical study of 4-(4 -N,N-dimethyl benzylidene)-2-phenyl oxazol-5-(4H)-one by using Z-scan techniques are discussed here. The ultrafast fluorescence decay of themolecule has been explained to be due to the electron transfer from the dimethyl group to the carbonylgroup.© 2009 Elsevier B.V. All rights reserved. 1. IntroductionHeterocyclescontainingoxazoloneringareimportanttargetsinsynthetic and medicinal chemistry, because of their importance aspotentially active compounds [1–5]. 5(4H)-Oxazolones, representa large family of -conjugated materials, having potential appli-cations in photonics and electronics, have also been studied fornonlinear optical properties [6]. Their large nonlinearity originatesfrom extensively delocalized -electron distribution. Studies ofnonlinearopticalpropertiesofthesedyeswithapplicationsinpho-tonics [7–13] can be carried out by degenerate four wave mixing(DFWM) and Z-scan techniques [14–17].The oxazolone derivatives have been found to exhibit NLOproperties in solid state as well as in solutions [18,19]. Their pho-tophysical properties are important for potential applications inphotonics and electronics [10,11]. In the present work, for the firsttime we have synthesized five new 5(4H)-oxazolones. We havestudied the nonlinear optical properties of one of the compounds(VII), by using Z-scan technique under picosecond and cw pump-ing.Thephotophysicalparametersofthiscompoundarealsogivenhere.