The Preparation of Luminescent,Mechanochromic Molecular Containers from Non-Emissive Components: The Box Cations, [Au6(Triphos)4Br]5+ and [Au6(Triphos)4Br2]4+ |
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| Authors: | Daniel T Walters Dr Xian B Powers Prof Marilyn M Olmstead Prof Alan L Balch |
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| Institution: | Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616 USA)Supramolecular Chemistry |
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| Abstract: | Two new molecular boxes, the mono-bromo box Au6(Triphos)4Br](SbF6)5⋅6(CH2Cl2), 4 mB , and the dibromo box, Au6(Triphos)4Br2⋅H2O](SbF6)4⋅4(CH2Cl2), 5 dB , have been prepared in crystalline form. Although constructed from non-luminescent components, both are strongly luminescent. Like its chloro counterpart, the mono-bromo box Au6(Triphos)4Br](SbF6)5⋅6(CH2Cl2), 4 mB , is mechanochromic. Under grinding, it loses its luminescence. The bromo-bridged helicate, (μ-Br){Au3(Triphos)2}2](CF3SO3)5⋅2(CH2Cl2), 3μ-H , with a cation that is isomeric with the box Au6(Triphos)4Br]5+, has also been prepared and crystallographically characterized. Unlike its chloro analogue, (μ-Br){Au3(Triphos)2}2](CF3SO3)5⋅2(CH2Cl2) is not luminescent. Thus, the cation produced upon grinding may be the cation present in the bromo-bridged helicate, (μ-Br){Au3(Triphos)2}2](CF3SO3)5⋅2(CH2Cl2), 3μ-H . The dibromo box, Au6(Triphos)4Br2⋅H2O](SbF6)4⋅4(CH2Cl2), 5 dB , is not significantly mechanochromic. |
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| Keywords: | bromide gold luminescence mechanochromism supramolecular chemistry |
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