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Toward control of electron transfer in donor-acceptor molecules by bond-specific infrared excitationDelor, Milan; Scattergood, Paul A.; Sazanovich, Igor V.; Parker, Anthony W.; Greetham, Gregory M.; Meijer, Anthony J. H. M.; Towrie, Michael; Weinstein, Julia A.
Science (American Association for the Advancement of Science), 12/2014, Letnik: 346, Številka: 6216Journal Article
Electron transfer (ET) from donor to acceptor is often mediated by nuclear-electronic (vibronic) interactions in molecular bridges. Using an ultrafast electronic-vibrationalvibrational pulse-sequence, we demonstrate how the outcome of light-induced ET can be radically altered by mode-specific infrared (IR) excitation of vibrations that are coupled to the ET pathway. Picosecond narrow-band IR excitation of high-frequency bridge vibrations in an electronically excited covalent trans-acetylide platinum(II) donor-bridge-acceptor system in solution alters both the dynamics and the yields of competing ET pathways, completely switching a charge separation pathway off. These results offer a step toward quantum control of chemical reactivity by IR excitation.
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