Nickel Coordination Compounds of Stanna-closo-dodecaborate

The reaction of the nickel complexes [(dppm)NiBr2] [dppm = 1,1‐bis(diphenylphosphanyl)methane] and [(dppe)NiBr2] [dppe = 1,2‐bis(diphenylphosphanyl)ethane] with stanna‐closo‐dodecaborate [Bu3NH]2[SnB11H11] (1) yielded the trigonal‐bipyramidal coordination compounds [Bu3NH]4[(dppm)Ni(SnB11H11)3] (2) and [Bu3NH]4[(dppe)Ni(SnB11H11)3](3). The square‐planar compound [Bu3NH]2[(ImiPr2Me2)2Ni(SnB11H11)2] (4) (ImiPr2Me2 = 1,3‐diisopropyl‐4,5‐dimethyl‐imidazoliumylidene) could be obtained by the reaction of the N‐heterocyclic carbene complex [(ImiPr2Me2)2NiBr2] with [Bu3NH]2[SnB11H11] (1). The new coordination compounds were characterized by heteronuclear NMR spectroscopy and single‐crystal X‐ray structure analysis.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) The reaction of stanna‐closo‐dodecaborate with [(dppm)NiBr2] and [(dppe)NiBr2]resulted in the formation of trigonal‐bipyramidal compounds [(dppm)Ni(SnB11H11)3]4– and [(dppe)Ni(SnB11H11)3]4–, respectively, which exhibit fluxional behavior in solution. Furthermore, the reaction of stannaborate with [(ImiPr2Me2)2NiBr2]yielded the nonfluxional square‐planar coordination compound [(ImiPr2Me2)2Ni(SnB11H11)2]2–.