Beryllium Halide Complexes Incorporating Neutral or Anionic Ligands: Potential Precursors for Beryllium Chemistry.

Author(s) Jones, C.; Paparo, A.
Journal Chem Asian J
Date Published 2019 Jan 03
Abstract

Reactions of the beryllium dihalide complexes [BeX2(OEt2)2] (X = Br or I) with N,N,N',N'-tetramethylethylenediamine (TMEDA), a series of diazabutadienes, or bis(diphenylphosphino)methylene (DPPM) have yielded the chelated complexes, [BeX2(TMEDA)], [BeX2{(RN=CH)2}] (R = But, mesityl (Mes), 2,6-diethylphenyl (Dep) or 2,6-diisopropylphenyl (Dip)), and the non-chelated system, [BeI2(κ1-P-DPPM)2]. Reactions of lithium or potassium salts of a variety of β-diketiminates have given both three-coordinate complexes, [{HC(RCNAr)2}BeX] (R = H or Me; Ar = Mes, Dep or Dip; X = Br or I); and four-coordinate systems, [{HC(MeCNPh)2}BeBr(OEt2)] and [{HC(MeCNDip)(MeCNC2H4NMe2}BeI]. Alkali metal salts of ketiminate, guanidinate, boryl/phosphinosilyl amide, or terphenyl ligands, lead to dimeric [{BeI{μ-[(OCMe)(DipNCMe)]CH}}2], and monomeric [{Pri2NC(NMes)2}BeI(OEt2)], [κ2-N,P-{(HCNDip)2B}(PPh2-SiMe2)NBeI(OEt2)] and [{C6H3Ph2-2,6}BeBr(OEt2)], respectively. Compound [{HC(MeCNPh)2}BeBr(OEt2)] undergoes a Schlenk redistribution reaction in solution, affording the homoleptic complex, [{HC(MeCNPh)2}2Be]. The majority of the prepared complexes have been characterized by X-ray crystallography and multi-nuclear NMR spectroscopy. The structures and stability of the complexes are discussed, as is their potential for use as precursors in poorly developed low oxidation state beryllium chemistry.

DOI 10.1002/asia.201801800
ISSN 1861-471X
Citation Chem Asian J. 2019.

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