Polyhedral iridathiaborane chemistry. Reactions of nido-6-SB 9 H 11 and of [arachno-6-SB 9 H 12 ] – with [{Ir(η 5 -C 5 Me 5 )Cl 2 } 2 ] to give nido-8,7-iridathiaundecarboranes. A nuclear magnetic resonance and structural study

The reaction of [{Ir(η5-C5Me5)Cl2}2] with nido-6-SB9H11 and a non-nucleophilic base yields [8-(η5-C5Me5)-nido-8,7-IrSB9H11]1, whereas with the [arachno-6-SB9H12]– anion it yields [8-(η5-C5Me5)-9-Cl-nido-8,7-IrSB9H10]2, [8-(η5-C5Me5)-10-Cl-nido-8,7-IrSB9H10]3 and [1-(η5-C5Me5)-closo-1,2-IrSB9H9]4. With [Ir(CO)Cl(PPh3)2], Cs[B9H12] yields a compound formulated as [exo-9-{Cl-trans-(PPh3)2-cis-H2Ir}-arachno-6-SB9H11] which, on thermolysis, yields 9-(PPh3)-arachno-6-SB9H11. The crystal and molecular structures of Cs[arachno-6-SB9H12] and compound 2 have been established by single-crystal X-ray diffraction analysis, and all the iridathiaboranes have been examined in detail by 1H and 11B single and multiple magnetic resonance spectroscopy.