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B-frame supported bimetallics. 'Composite cluster' compounds and the structures of [2,7-(η 5 -C 5 Me 5 ) 2 -nido-2,7,8,6-Ir 2 CSB 6 H 8 ] and its 9-chloro derivative. Synchrotron and conventional X-ray studies
Reaction of [IrCl 2 (η 5 -C 5 Me 5 )] 2 with the [hypho-CSB 6 H 11 ] - anion gives [2,7-(η 5 -C 5 Me 5 ) 2 -nido-2,7,8,6-Ir 2 CSB 6 H 8 ] and [2,7-(η 5 -C 5 Me 5 ) 2 -nido-2,7,8,6-Ir 2 CSB 6 H 7 -9-Cl] which exhibit composite cluster features in which the {IrSIrC} string and the {B 6 } unit occupy separate domains within the overall contiguous nido-type ten-vertex {Ir 2 SCB 6 } cluster unit.