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• W2125780345 endingPage "1793" @default.
• W2125780345 startingPage "1777" @default.
• W2125780345 abstract "The homologous series of parent octamethylcyclotetrasilazane (c-NH-SiMe2-)4, (1), the lithium complex [(THF)2Li2(c-N-SiMe2-NH-SiMe2-)2]2, (2), containing the cyclic dianion, and [(THF)2LiAl(c-N-SiMe2-)4]2, (3), accommodating the unprecedented tetraanion [Me2SiN]4- was synthesized to investigate the nature of the covalent Si-N single bond in the presence of various metals. These model compounds show a wide diversity of Si-N(H), Si-N(M), Si-N(H, M) and M-N bonds and serve as bench-mark systems to study polar bonds by high-resolution low-temperature X-ray structure analysis. Experimental charge density studies reveal highly polar Si-N bonds with remarkable ionic contribution, even in the non-metallated starting material 1. The Li-N and Li-O bonds have to be classified as almost purely ionic bonds with topological properties not far from those determined for NaCl. Experimentelle Elektronendichteuntersuchungen an Cyclotetrasilazan und Metallkomplexen des Di- und Tetraanions Ausgehend vom Octamethylcyclotetrasilazan (c-NH-SiMe2-)4, (1), wurden die Lithiumverbindung [(THF)2Li2(c-N-SiMe2-NH-SiMe2-)2]2, (2), die ein cyclisches Dianion beinhaltet, und [(THF)2LiAl(c-N-SiMe2-)4]2, (3), das das bis dato unbekannte Tetraanion [Me2SiN]4- enthält, synthetisiert, um die Natur der kovalenten Si-N-Einfachbindung in Gegenwart verschiedener Metalle zu untersuchen. Diese Modellverbindungen zeigen eine große Bandbreite an Si-N(H), Si-N(M), Si-N(H, M) und M-N Bindungen und eignen sich damit als Vergleichsverbindungen für Untersuchungen polarer Bindungen mittels hochauflösender Röntgenstrukturanalyse bei tiefen Temperaturen. Die Ergebnisse der experimentellen Elektronendichteuntersuchungen zeigen hoch polare Si-N-Bindungen mit deutlich ionischen Anteilen bereits in dem nicht-metallierten Ausgangsmaterial 1. Die Li-N- und Li-O-Bindungen mit topologischen Eigenschaften, die den für NaCl bestimmten stark ähneln, müssen als rein ionisch klassifiziert werden." @default.
• W2125780345 created "2016-06-24" @default.
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• W2125780345 date "2004-10-01" @default.
• W2125780345 modified "2023-10-09" @default.
• W2125780345 title "Experimental Charge Density Studies of Cyclotetrasilazane and Metal Complexes Containing the Di- and Tetraanion" @default.
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• W2125780345 doi "https://doi.org/10.1002/zaac.200400277" @default.
• W2125780345 hasPublicationYear "2004" @default.
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