Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1496950 | Optical Materials | 2007 | 5 Pages |
Abstract
Two malononitrile derivatives, 2-[2,5-bis-(4-dimethylamino-benzylidene)-cyclopentylidene]-malononitrile (1) and 2-{2,6-bis-[2-(4-dimethylamino-phenyl)-vinyl]-pyran-4-ylidene}-malononitrile (2), were synthesized and their photophysical characteristics were investigated using UV-vis spectra, fluorescence spectra, nonlinear transmission and two-photon excited spectra. The results showed that both compounds exhibited strong intramolecular charge transfer absorption bands within 400-600Â nm, but only compound 2 presented a strong fluorescence emission. By nonlinear transmission method, the two-photon absorption cross-section (Ï) values of two compounds were determined as 250Â GM and 283Â GM, respectively, with 800Â nm femtosecond laser pulses. By two-photon excited fluorescence method, the two-photon excited spectra of compound 2 within 720-880Â nm was measured and its Ïmax was obtained as 773Â GM at 770Â nm.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yuxia Zhao, Li Xiao, Feipeng Wu, Xiangyun Fang,