Reversible formation of ruthenium cluster (.mu.-H)Ru4(CO)10(.mu.-PPh2)[.mu.4-.eta.1(P),.eta.1(P),.eta.1(P),.eta.1,.eta.2-[C6H4]PPh] from the electron-rich cluster Ru4(CO)13(.mu.-PPh2)2: the first example of a molecule with a five-coordinate bis(aryl)phosphido bridge

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