Terminale und verbrückende Koordination von Indium‐Indium‐Bindungen – bemerkenswerte Polymorphie an der Verbindung In2R2[(OCC6H5)2CH]2 [R = C(SiMe3)3] |
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Authors: | Werner Uhl Prof Dr Andreas Lawerenz Sarina Zemke |
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Institution: | 1. Münster, Institut für Anorganische und Analytische Chemie der Universit?t MünsterInstitut für Anorgan. Chemie der Universit?t, Corrensstr. 30, D‐48149 Münster;2. Münster, Institut für Anorganische und Analytische Chemie der Universit?t Münster |
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Abstract: | Terminal and Bridging Coordination of Indium‐Indium Bonds – Remarkable Polymorphism with the Compound In2R2(OCC6H5)2CH]2 R = C(SiMe3)3] Treatment of the dimeric indium(II) subhalide (In2R2Cl2)2 ( 1 ) R = C(SiMe3)3] with four equivalents of lithium dipivaloylmethanide or lithium dibenzoylmethanide afforded by the release of lithium chloride the corresponding diindium diacetylacetonates ( 2 and 3 ). The In‐In single bonds of the products were terminally coordinated by chelating acectylacetonato ligands and the bulky alkyl groups. Three different crystal structures were determined for the dibenzoylmethanide derivative 3 which in the solid state adopted trans and gauche conformations across the In‐In bonds. In contrast to the terminally arranged acetylacetonato ligands of compounds 2 and 3 alkylbenzoato ligands R‐COO? (3,5‐dimethylbenzoate and p‐tert‐butylbenzoate) gave the bridging coordination of the In‐In bonds by two chelating carboxylato groups ( 4 and 5 ). This particular coordination caused a strong shortening of the In‐In bond length in 4 compared to the unsupported bonds in 2 and 3 (264.6 versus 274.7 to 279.3 pm). |
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Keywords: | Indium Subvalent compounds Heterocycles Chelating ligands |
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