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Metal‐Hydride Bonding in Higher Alkali Metal Boron Monohydrides
Author(s) -
Haywood Joanna,
Wheatley Andrew E. H.
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900756
Subject(s) - chemistry , hydride , alkali metal , denticity , dimer , metal , boron , crystallography , inorganic chemistry , tetramethylethylenediamine , medicinal chemistry , crystal structure , organic chemistry
The recent demonstration that hydride translocation involving alkali metal boron monohydrides can be utilised to trap hydride in metal clusters has led to investigation of the alkali metal salts of triethylborohydride, [Et 3 BH] – . Treatment of Et 3 BHM (M = Li, Na, K) with the polydentate donors (L) N , N , N ′, N ′‐tetramethylethylenediamine (TMEDA) and N , N , N ′, N ″, N ″‐pentamethyldiethylenetriamine (PMDETA) is reported. For M = Li, L = TMEDA ion separation is noted, with the metal ion encapsulated by two donor ligands. In contrast, for M = Na, K the TMEDA‐solvates reveal hydride‐bridged centro‐symmetric dimers based on M 2 H 2 ‐metallocyclic cores. X‐ray diffraction reveals mean Na–H and K–H distances of 2.29 and 2.55 Å, respectively. For M = K, the PMDETA‐solvate is also reported, with the hydride‐bridged dimer motif being retained, with an expanded mean metal–hydride distance of 2.67 Å. Solution data and 1 J BH coupling constants are reported in both polar and non‐polar solvents.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)