Iridium Coordination Compounds of Stanna-<i>closo</i>-dodecaborate

Abstract

The reaction of Vaska’s complex [IrCl(CO)(PPh 3 ) 2 ] with stanna- closo -dodecaborate [SnB 11 H 11 ] 2− ( 1 ) resulted in the formation of the trigonal bipyramidal iridium(I) compound [Ir(SnB 11 H 11 ) 2 (CO)(PPh 3 ) 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 [Et 4 N][Ir(SnB 11 H 11 )(CO) 2 (PPh 3 ) 2 ] ( 3 ) and [Me 4 N][Ir(SnB 11 H 11 )(CO)(C 2 H 4 )(PPh 3 ) 2 ] ( 4 ). Oxidative addition of H 2 was accomplished by the reaction of 2 with H 2, yielding the iridium(III) compound [Et 3 NMe][IrH 2 (SnB 11 H 11 )(CO)(PPh 3 ) 2 ] ( 5 ), whereas the protonation of 2 resulted in the formation of [Et 3 NMe] 2 [IrH(SnB 11 H 11 ) 2 (CO)(PPh 3 ) 2 ] ( 6 ). All compounds have been characterized by single-crystal X-ray diffraction analysis, multinuclear NMR spectroscopy, IR spectroscopy, and elemental analysis.