The symmetric and quadrupolar donor-acceptor-donor(D-A-D)molecules usually exhibit excited-state charge redistribution process from delocalized intramolecular charge transfer(ICT)state to localized ICT state.Direct observation of such charge redistri-bution process in real-time has been intensively stud-ied via various ultrafast time-resolved spectroscopies.Femtosecond stimulated Raman spectroscopy(FSRS)is one of the powerful methods which can be used to determine the excited state dynamics by track-ing vibrational mode evolution of the specific chemical bonds within molecules.Herein,a molecule,4,4'-(buta-1,3-diyne-1,4-diyl)bis(N,N-bis(4-methoxyphenyl)aniline),that consists of two central adjacent alkyne(-C≡C-)groups as electron-acceptors and two separated,symmetric N,N-bis(4-methoxyphenyl)aniline at both branches as electron-donors,is cho-sen to investigate the excited-state photophysical properties.It is shown that the solvation induced excited-state charge redistribution in polar solvents can be probed by using fem-tosecond stimulated Raman spectroscopy.The results provide a fundamental understanding of photoexcitation induced charge delocalization/localization properties of the symmetric quadrupolar molecules with adjacent vibrational markers located at central position.

Wei Zhang;Jie Kong;Wenqi Xu;Xinmiao Niu;Di Song;Weimin Liu;Andong Xia

State Key Laboratory of Information Photonic and Optical Communications,School of Science,Beijing University of Posts and Telecommunications(BUPT),Beijing 100876,China;Beijing National Laboratory for Molecular Sciences(BNLMS),Key Laboratory of Photochemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;STU SIOM Joint Laboratory for Superintense Lasers and the Applications,Shanghai 201210,China

化学物理学报（英文版）

[1]Wei Zhang;Jie Kong;Wenqi Xu;Xinmiao Niu;Di Song;Weimin Liu;Andong Xia-.Probing Effect of Solvation on Photoexcited Quadrupolar Donor-Acceptor-Donor Molecule via Ultrafast Raman Spectroscopy)[J].化学物理学报（英文版）,2022(01):69-76

Photoexcited,Quadrupolar,quadrupolar,FSRS,buta,tosecond

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