The reaction of the manganese precursors [MnOTf(CO)3{1,2-(PH2)2C6H4}], 5, or [MnOTf(CO)3{1,2-(PH2)2C2H4}], 6, with either the silver complex of 1,3-diallylbenzimidazol-2-ylidiene or the free carbene, resulted in the formation of the new, dimeric phosphino-micro-phosphido manganese species 7 and 8. Complex 7 crystallises in two isomeric forms (cis and trans), depending upon the choice of solvent. The structures of both isomers have been determined by single-crystal X-ray techniques.
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