期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 28, 页码 E6396-E6403出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1719899115
关键词
ultrafast; intersystem crossing; vibrational coherence; diplatinum complexes; solvation
资金
- Swiss National Science Foundation (NSF) via the National Center of Competence in Research/Molecular Ultrafast Science and Technology [200021_137717]
- European collaboration program Cooperation in Science and Technology [CM1202, CM1405]
- Czech Science Foundation [17-011375]
- NSF Center for Chemical Innovation in Solar Fuels Program [CHE-1305124]
We investigate the ultrafast transient absorption response of tetrakis(mu-pyrophosphito) diplatinate(II), [Pt-2(mu-P2O5H2)(4)](4-) [hereafter abbreviated Pt(pop)], in acetonitrile upon excitation of its lowest singlet (1)A(2u) state. Compared with previously reported solvents [van der Veen RM, Cannizzo A, vanMourik F, Vlcek A, Jr, CherguiM(2011) J Am Chem Soc 133:305-315], a significant shortening of the intersystem crossing (ISC) time (<1 ps) from the lowest singlet to the lowest triplet state is found, allowing for a transfer of vibrational coherence, observed in the course of an ISC in a polyatomic molecule in solution. Density functional theory (DFT) quantum mechanical/molecular mechanical (QM/MM) simulations of Pt( pop) in acetonitrile and ethanol show that high-lying, mostly triplet, states are strongly mixed and shifted to lower energies due to interactions with the solvent, providing an intermediate state (or manifold of states) for the ISC. This suggests that the larger the solvation energies of the intermediate state(s), the shorter the ISC time. Because the latter is smaller than the pure dephasing time of the vibrational wave packet, coherence is conserved during the spin transition. These results underscore the crucial role of the solvent in directing pathways of intramolecular energy flow.
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