扩展卟啉分子的多光子吸收特性

发展关联电子体系的多参考组态相互作用方法, 应用态求和的张量方法, 计算研究了三种扩展卟啉分子的多光子吸收特性. 计算结果表明, 通过中间插入噻吩杂环基团, 扩展卟啉分子的双光子和三光子吸收峰发生较大红移, 对应的吸收截面得到显著的提高, 并且三光子吸收截面的增加更为明显; 但是由于卟啉环扩大导致分子平面发生扭曲, 三光子吸收截面的增大趋势明显减弱.

Multiphoton Absorption in Expanded Porphyrins

We have calculated the multiphoton absorption cross-sections for three expanded porphyrin derivatives using the sum-over-states-involved tensor approach in combination with the strongly correlated multireference determinant single- and double-configuration interaction method. The calculated results showed that the two- and three-photon energies corresponding to the first peak of the multiphoton absorption spectra showed a decrease (red-shifted) with the number of inserted thiophene groups, whereas the cross sections showed a remarkable increase, particularly for three-photon absorption cross-section. However, the larger twist of the molecular plane for the expanded molecule resulted in an obvious drop in the increasing trend for three-photon absorption cross-section.