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" J. Xu, H. Volfova, R. J. Mulder, L. Goerigk, G. Bryant, E. Riedle and C. RitchieJ. Am. Chem. Soc. 140, 10482 - 10487 (2018) Abstract: Herein we report the first photochromic polyoxometalate based diarylethene coordination complex, prepared by liga-tion of two cobalt (III) incorporated borotungstates [BIIIWVI11O39CoIII]6- with the ditopic pyridyl containing diarylethene (C25H16N2F6S2). The solution state composition, structure and stability of the assembly was probed using 1H and 19F Nuclear Magnetic Resonance Spectroscopy (NMR), Electrospray Ionization Quadrupolar Time of Flight Mass Spectrometry (ESI-QTOF-MS), Ultra-violet-Visible Spectroscopy (UV-Vis) and Small Angle X-ray Scattering (SAXS), revealing that the complex self-organizes to adopt a molecular dumbbell structure due to electrostatic and steric considerations. This conformation is a pre-requisite for the photocy-clization reaction. The assembly was found to be switchable between two states using visible light due to the perturbation of the diarylethene electronic structure on coordination to the polyoxometalate. We present photophysical data, including the reaction quan-tum efficiency of the molecular switch in both directions measured using a custom-built quantum yield determination setup in addition to fatigue resistance on prolonged irradiation. BMO authors (in alphabetic order): Henrieta Derondeau Eberhard Riedle Order Hardcopy  DOI-Version |
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Letzte Änderung: 2016-09-14 13:34
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