The synthesis of [MePPh 3 ][SnCB 10 H 11 ] is presented together with its structural, NMR, and 119 Sn Mo ¨ssbauer spectroscopical characterization. Two transition metal complexes, [Au 4 (PPh 3 ) 4 (SnCB 10 H 11 ) 2 ] and [Bu 4 N] 2 [Rh(PPh 3 ) 2 (SnCB 10 H 11 ) 3 ], with the carbastannaborate coordinated at rhodium or gold via the tin atom are presented, and the structural and NMR spectroscopical data are discussed.

Experimental: Solvents were dried and purified by standard methods and were stored under argon. NMR spectra were recorded on a Bruker DRX-250 NMR spectrometer equipped with a 5 mm ATM probe head and operating at 250.

The synthesis and characterization of three ruthenium complexes [Bu(3)MeN][Ru(PPh(3))(2)(NH(2)-B(12)H(11))Cl], [Bu(4)N][Ru(dppb)(NH(2)-B(12)H(11))Cl] and [RuCO(PPh(3))(2)(NH(2)-B(12)H(11))] with amino-closo-dodecaborate as the coordinating ligand are described.

The reaction of Vaska’s complex [IrCl(CO)(PPh3)2] with stanna-closo-dodecaborate [SnB11H11]2− (1) resulted in the formation of the trigonal bipyramidal iridium(I) compound [Ir(SnB11H11)2(CO)(PPh3)2]3− (2). In this compound, one stannaborate moiety can be readily substituted with CO or ethylene at RT and atmospheric pressure to give the trigonal bipyramidal compounds [Et4N][Ir(SnB11H11)(CO)2(PPh3)2] (3) and [Me4N][Ir(SnB11H11)(CO)(C2H4)(PPh3)2] (4). Oxidative addition of H2 was accomplished by the reaction of 2 with H2, yielding the iridium(III) compound [Et3NMe][IrH2(SnB11H11)(CO)(PPh3)2] (5), whereas the protonation of 2 resulted in the formation of [Et3NMe]2[IrH(SnB11H11)2(CO)(PPh3)2] (6). All compounds have been characterized by single-crystal X-ray diffraction analysis, multinuclear NMR spectroscopy, IR spectroscopy, and elemental analysis.

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