TY - JOUR
T1 - Bimetallic zwitterionic complexes with an ambident stanna-closo- dodecaborate ligand
T2 - [1-{M(CO)5}-2,7,8-(μ-H)3- {Fe(triphos)}·SnB11H11] (M = Cr, Mo, W)
AU - Gädt, Torben
AU - Eichele, Klaus
AU - Wesemann, Lars
PY - 2006/7/31
Y1 - 2006/7/31
N2 - Starting from FeBr2 the zwitterionic stannaborate complex [1-{Fe(MeCN)2(triphos)}-SnB11H11] (1) could be obtained in a straightforward one-pot synthesis. Via a facile η1(Sn) to η3(BH) rearrangement reaction 1 can be converted into [2,7,8-(μ-H)3-{Fe(triphos)}-SnB11H 11] (2). The nucleophilicity of the tin atom in compound 2 is strongly reduced compared to the dianionic parent stannaborate cluster [SnB 11H11]2-. Methylation at the tin atom using standard methods is not feasible. Transition metal fragments can be coordinated at the tin atom of 2 if reactive species such as M(CO)5(THF) (M = Cr, Mo, W) are employed. Reaction of these fragments with 2 yields the bimetallic zwitterions [1-{M(CO)5}-2,7,8-(μ-H)3-{Fe(triphos)}- SnB11H11] (M = Cr, Mo, W) (3,4,5), which contain an ambident stannaborate moiety. All new compounds have been characterized using 1H, 11B, 13C, 31P, and 119Sn NMR spectroscopy as well as 31P and 119Sn MAS NMR experiments. Single-crystal X-ray diffraction analyses have been carried out for all novel compounds.
AB - Starting from FeBr2 the zwitterionic stannaborate complex [1-{Fe(MeCN)2(triphos)}-SnB11H11] (1) could be obtained in a straightforward one-pot synthesis. Via a facile η1(Sn) to η3(BH) rearrangement reaction 1 can be converted into [2,7,8-(μ-H)3-{Fe(triphos)}-SnB11H 11] (2). The nucleophilicity of the tin atom in compound 2 is strongly reduced compared to the dianionic parent stannaborate cluster [SnB 11H11]2-. Methylation at the tin atom using standard methods is not feasible. Transition metal fragments can be coordinated at the tin atom of 2 if reactive species such as M(CO)5(THF) (M = Cr, Mo, W) are employed. Reaction of these fragments with 2 yields the bimetallic zwitterions [1-{M(CO)5}-2,7,8-(μ-H)3-{Fe(triphos)}- SnB11H11] (M = Cr, Mo, W) (3,4,5), which contain an ambident stannaborate moiety. All new compounds have been characterized using 1H, 11B, 13C, 31P, and 119Sn NMR spectroscopy as well as 31P and 119Sn MAS NMR experiments. Single-crystal X-ray diffraction analyses have been carried out for all novel compounds.
UR - http://www.scopus.com/inward/record.url?scp=33746889734&partnerID=8YFLogxK
U2 - 10.1021/om060328m
DO - 10.1021/om060328m
M3 - Article
AN - SCOPUS:33746889734
SN - 0276-7333
VL - 25
SP - 3904
EP - 3911
JO - Organometallics
JF - Organometallics
IS - 16
ER -