The electronic structure and second-order nonlinear optical properties of donor-acceptor acetylenes: a detailed investigation of structure-property relationships
作者:Albert E. Stiegman、Eva Graham、Kelly J. Perry、Lutfur R. Khundkar、L. T. Cheng、Joseph W. Perry
DOI:10.1021/ja00020a030
日期:1991.9
increases in the magnitude of beta. For this class of molecules, the increase is dominated by the energy of the intramolecular charge-transfer transition, while factors such as the ground to excited-state dipole moment change and the transition-moment integral are much less important. Increasing the conjugation length from one to two acetylene linkers did not result in an increase in the value of beta;
合成了一系列供体-受体乙炔化合物,其中共轭长度和供体-受体强度都发生了系统变化。研究了这些结构变化对分子光谱和电子特性的影响,并最终对测得的二阶分子超极化率 (beta) 产生了影响。发现供体-受体强度的增加导致β量级的增加。对于这类分子,增加主要由分子内电荷转移跃迁的能量决定,而诸如基态到激发态偶极矩变化和跃迁矩积分等因素则不那么重要。将共轭长度从 1 个乙炔接头增加到两个乙炔接头不会导致 β 值增加;然而,β 从两个乙炔变成三个乙炔急剧增加。这种增加归因于几个几乎等能的激发态的叠加。