NMR‐Spectroscopic Detection of an Elusive Protonated and Coinage Metalated Silicide [NHC Dipp Cu(η 4 ‐Si 9 )H] 2− in Solution

Autor:	Stefanie Gärtner, Nikolaus Korber, Susanne M. Tiefenthaler, Verena Streitferdt, Ilya G. Shenderovich, Ruth M. Gschwind
Rok vydání:	2021
Předmět:	Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Proton Silicide Liquid ammonia Cluster (physics) chemistry.chemical_element Protonation Spectroscopic detection Nuclear magnetic resonance spectroscopy Copper
Zdroj:	European Journal of Inorganic Chemistry. 2021:3684-3690
ISSN:	1099-0682 1434-1948
DOI:	10.1002/ejic.202100419
Popis:	A simultaneously protonated and functionalized silicide cluster [NHCDippCu(η4-Si9)H]2− was detected and characterized in liquid ammonia by NMR spectroscopy. Key NMR results were corroborated by theoretical calculations. 1H-NMR line-widths at variable temperatures revealed that proton hopping in the metalated complex [NHCDippCu(η4-Si9)H]2− is less pronounced than in the non-complexed silicide [HSi9]3−. Besides [HSi9]3− and [NHCDippCu(η4-Si9)H]2− also the unprotonated analogous cluster [NHCDippCu(η4-Si9)]3− was detected in solution. In addition, a new 29Si-NMR signal was obtained in the course of 29Si-NMR studies that we assigned to [NHCDippCu(η4-Si9)]3−. The isolation of crystals of (K[2.2.2]-crypt)2K0.48Rb3.52[NHCDippCu(η4-Si9)]2 prove the availability of the non-protonated NHCDippCu(η4-Si9) fragment in solution. To the best of our knowledge the detection of [NHCDippCu(η4-Si9)H]2− represents the first case of a protonated and coinage metalated group 14 Zintl cluster in solution so far.
Databáze:	OpenAIRE
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