Many photochemical events, such as bond breaking, intersystem crossing and electron/energy transfer, can occur well before excited state vibrational relaxation. Using fs broadband transient spectroscopy and fs X-ray solution scattering, events of light-matter interactions in molecular systems, such as coherent vibrational wavepacket motions can be readily examined. From the time evolution of key vibrational modes, particularly the Pt-Pt stretching mode, we mapped out excited state trajectories on potential energy surfaces of model Pt-dimer complexes for light conversion, including coherent nuclear motions. These studies were carried out in a series of model platinum dimer complexes in solution featuring rich photochemistry and a set of intricate excited state potential energy surfaces on time scale previously unattainable.  The combined molecular design, experimental and theoretical approaches enabled quantitative evaluation of the excited state trajectories of a series of Pt-dimer complexes in terms of actual nuclear motions via the Pt-Pt stretch as well as the energetic variations associated with these motions.<br/>

Mapping out excited state structural dynamic trajectories via vibrational coherence detected by femtosecond optical spectroscopy and X-ray scattering

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.