Question

what are hncc in metal carbonyl cluster with examples.​

Answer 1

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The most common examples of tetranuclear carbonyl clusters are Ir4(CO)12, Co4(CO)12, Rh4(CO)12, Re4CO16 2−, Ru3(CO)12 and Os4(CO)16 systems. 1. ... The 18-electron count for Ir4(CO)12 is 4×9 + 12×2 = 60. Hence, six metal-metal bonds (12 electrons) are needed to fulfill the requirement of four metal centers (72 electrons).