二苯乙炔
双光子吸收
吸收(声学)
化学
偶极子
吸收光谱法
分子
光化学
密度泛函理论
离散偶极子近似
计算化学
分子物理学
材料科学
激光器
有机化学
光学
物理
催化作用
复合材料
作者
Shota Watanabe,Akira Tahara,Tasuku Isozaki,Sho Kinoshita,Ryo Takeuchi,Wataru Kashihara,Tadashi Suzuki
标识
DOI:10.1021/acs.jpca.3c02865
摘要
Two-photon absorption for diphenylacetylene (DPA) derivatives with two substituents (−OMe and/or −NO2) at the 4,4′-position was investigated experimentally and theoretically. The two-photon absorption spectra and the two-photon absorption cross-sections σ(2) for DPA derivatives were obtained by optical-probing photoacoustic spectroscopy (OPPAS). The simulated two-photon absorption spectra of the DPA derivatives, obtained with the time-dependent density functional theory within the Tamm-Dancoff approximation, agreed well with the experimental ones. The mechanisms for enhancement of the σ(2) for centrosymmetric and non-centrosymmetric DPA derivatives were found to be different. The large σ(2) for centrosymmetric molecules (DPA-OMeOMe and DPA-NO2NO2) results from the magnitude of the transition dipole moment, while for non-centrosymmetric molecules (DPA-OMeNO2), it is enhanced by the smaller detuning energy. Information on two-photon absorption properties of DPA derivatives obtained in this study will be important for the molecular design of two-photon absorption materials.
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