REVERSIBLE REARRANGEMENT OF A TETRARUTHENIUM CLUSTER CONTAINING QUADRUPLY BRIDGING PPh GROUPS TO ONE CONTAINING TRIPLY BRIDGING PPh LIGANDS THROUGH UPTAKE OF CARBON MONOXIDE; CRYSTAL AND MOLECULAR STRUCTURES OF 3-XPh)2(CO)13> (X = P or As)

Article abstract of DOI:10.1016/S0022-328X(00)93991-3

, in which an essentially square planar array of ruthenium atoms is capped by two phenylphosphinidene groups, readily and reversibly adds carbon monoxide to afford the tridecacarbonyl derivative ; crystal structure determinations on this compound and its arsenic analogue reveal that the CO addition is accompanied by a rearrangement of the cluster framework, and that these compounds can be considered as derivatives of (X=P or As) in which an Ru(CO)4 unit has been inserted into one of the three Ru-P or Ru-As bonds.