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Reversible transcis photoisomerizations of [Re(CO)3(ph2phen)(stpyCN)]+ towards molecular machines

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Abstract

In our search for light powered molecular devices, a novel fac-[Re(CO)3(ph2phen)(trans-stpyCN)]+ complex was synthesized to show switchable transcis configurations of the coordinated stpyCN ligand through efficient and reversible photoassisted isomerizations. Controlled photolyses of acetonitrile solutions led to spectral changes ascribed to reversible transcis photoisomerization processes. A remarkable quantum yield for the back cis-to-trans isomerization was obtained, with the same magnitude of the trans-to-cis photoprocess, and curiously, both trans- and cis-isomers are emissive at room temperature. Photochemical and photophysical characterization studies for fac-[Re(CO)3(ph2phen)(stpyCN)]+ provided insights into the isomerization and emissive light-driven pathways that are resulted from the interactions between the close-lying intraligand and charge transfer states. The reversible cistrans photoisomerization has potential to be exploited as light-powered molecular motors and geometry regulators in molecular machines.

Graphical abstract: Reversible trans ⇌ cis photoisomerizations of [Re(CO)3(ph2phen)(stpyCN)]+ towards molecular machines

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Publication details

The article was received on 05 May 2017, accepted on 04 Jul 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT01648D
Citation: Dalton Trans., 2017, Advance Article
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    Reversible transcis photoisomerizations of [Re(CO)3(ph2phen)(stpyCN)]+ towards molecular machines

    K. P. S. Zanoni and N. Y. Murakami Iha, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT01648D

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