title: Study on the second-order optical behavior of 4-(substituted-benzylidene)-2-phenyl-4H-oxazol-5-one.
abstract: The maximum absorption wavelengths (lambda(a-max)), absorption coefficient (epsilon), maximum emission wavelengths (lambda(e-max)) of 4-benzo[1,3]dioxol-5-ylmethylene-2-phenyl-4H-oxazol-5-one (1), 4-(3,4-dimethoxybenzylidene)-2-phenyl-4H-oxazol-5-one (2) and 4-(3,4,5-trimethoxy-benzylidene)-2-phenyl-4H-oxazol-5-one (3) were measured, their second-order nonlinear polarization values (beta(xxx)) were determined by solvatochromic method. Although the spectral nature (lambda(a-max), epsilon, lambda(e-max)) and beta(xxx) values of 1, 2 and 3 were close to each other in the same solvent, the second-order harmonic generation (SHG) value of sample 1 is higher obviously than that of sample 2 or 3 in solid state. The crystal structures of 1 and 2 characterized by single crystal X-ray diffraction technique indicated the reason why the SHG value of 1 is higher.
authors.affiliation: Department of Chemistry, Zhongshan University, Guangzhou 510275, China. songhuacan@hotmail.com
authors.forename: Hua-Can
authors.initials: HC
authors.lastname: Song
authors.forename: Huan
authors.initials: H
authors.lastname: Wen
authors.forename: Wei-Ming
authors.initials: WM
authors.lastname: Li
mesh_terms: D018360:Crystallography, X-Ray; D005454:Fluorescence Polarization; D008958:Models, Molecular; D015394:Molecular Structure; D055095:Optics and Photonics; D010080:Oxazoles / Q000737:chemistry*; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D055672:Static Electricity
chemical_list: D010080:Oxazoles