期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 51, 页码 15488-15492出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201505377
关键词
assembly; Keggin isomers; photochromism; polyoxometalates; supramolecular chemistry
资金
- University of Glasgow
- Royal Society of Edinburgh
- Royal Society / Wolfson Foundation
- EPSRC [EP/L023652/1, EP/K038885/1, EP/H024107/1, EP/K023004/1, EP/K021966/1, EP/I033459/1, EP/J015156/1, MICREAGENTS EC 318671]
- EPSRC [EP/L023652/1, EP/H024107/1, EP/C542819/1, EP/I033459/1, EP/K038885/1, EP/K021966/1, EP/J015156/1, EP/K023004/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K021966/1, EP/L023652/1, EP/K023004/1, EP/H024107/1, EP/I033459/1, EP/J015156/1, EP/K038885/1, EP/C542819/1] Funding Source: researchfish
We report the synthesis, structural, and electronic characterization of the theoretically predicted, but experimentally elusive delta-isomer of the Keggin polyoxometalate polyanion. A family of delta-Keggin polyoxoanions of the general formula, (TEA)HpNaq [H2M12(XO4)O-33(TEA)]center dot rH(2)O where p, q, r=[2,3,8] for 1 and [4,1,4] for 2 were isolated by the reaction of tungstate(VI) and vanadium(V) with triethanolammonium ions (TEAH), acting as a tripodal ligand grafted to the surface of the cluster thereby stabilizing the polyanionic delta-Keggin archetype. The delta-Keggin species were characterized by single-crystal X-ray diffraction, FT-IR, UV/Vis, NMR, and ESI-MS spectrometry. Electronic structure and structure-stability correlations were evaluated by means of DFT calculations. The compounds exhibited multi-electron transfer and reversible photochromic properties by undergoing single-crystal-to-single-crystal (SC-SC) transformations accompanied with color changes under light.
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