Geometry changes of a Cu(I) phenanthroline complex on photoexcitation in a confining medium by time-resolved X-ray diffraction |
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Authors: | Coppens Philip Vorontsov Ivan I Graber Timothy Kovalevsky Andrey Yu Chen Yu-Sheng Wu Guang Gembicky Milan Novozhilova Irina V |
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Institution: | Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, USA. coppens@buffalo.edu |
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Abstract: | Using a stroboscopic technique, in which the molecule is repeatedly excited and the structural change is probed more than 5000 times per second immediately after excitation, we performed a 16 K time-resolved single-crystal study of the microsecond lifetime triplet state of the Cu(I)phenanthroline derivativeCu(I)(dmp)(dppe)]PF6] (dppe = 1,2-bis(diphenylphosphino)ethane). The geometry changes on excitation differ for the two symmetry-independent molecules, but are in the same direction as calculated for an isolated reference molecule, although the flattening distortion in the crystal is significantly smaller, implying that the reorganization energy is greatly affected by the confining medium. |
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