期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 11, 期 14, 页码 4191-4198出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200401134
关键词
anthracene; donor-acceptor systems; excited states; fluorescence; two-photon absorption
A series of 2,6- and 2,7-bis(styryl)anthracene derivatives with the donors at the styryl group and acceptors at the 9,10-positions have been synthesized, and their two-photon cross sections (Phi delta(max)) were determined. These compounds exhibit a peak two-photon absorptivity (delta(max)) in the range of 700-2500 GM at 780-1030 nm. Values of lambda(max) and Stokes shifts increase as the acceptor is changed to a stronger one. There is also a parallel increase in lambda((2))(max) and delta(max) with the same variation of the chromophore structure. Both (2) and have been optimized by introducing donor-substituted styryl groups at the 2,6-positions and p-cyanophenyl groups at the 9,10-positions, respectively. The effect of a pi center on the two-photon absorption properties has been assessed by comparing the existing data for a variety of D-pi-D derivatives.
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