title: Two-photon absorption properties of 2,6-bis(styryl)anthracene derivatives: effects of donor-acceptor substituents and the pi center.
abstract: 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 (Phidelta(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 lambda (2)(max)and Phidelta(max) 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.
authors.affiliation: Molecular Opto-Electronics Laboratory, Department of Chemistry and Center for Electro- and Photo-Responsive Molecules, Korea University, Seoul.
authors.forename: Wen Jun
authors.initials: WJ
authors.lastname: Yang
authors.forename: Dae Young
authors.initials: DY
authors.lastname: Kim
authors.forename: Mi-Yun
authors.initials: MY
authors.lastname: Jeong
authors.forename: Hwan Myung
authors.initials: HM
authors.lastname: Kim
authors.forename: Yun Kyoung
authors.initials: YK
authors.lastname: Lee
authors.forename: Xingzhong
authors.initials: X
authors.lastname: Fang
authors.forename: Seung-Joon
authors.initials: SJ
authors.lastname: Jeon
authors.forename: Bong Rae
authors.initials: BR
authors.lastname: Cho