A new type of polycyclophosphidochromium cluster, [(Cp)Cr(CO) 2 ] 5 P 10 (Cp =η 5 -C 5 H 5 ). First observation of polycylic P-to-M coordination

The co-thermolysis of [(Cp)Cr(CO)3]2(Cp =η5-C5H5) with P4 forms [(Cp)Cr(CO)2]5P10, a new paramagnetic structure with a P10 core, which represents the first example of polycyclic phosphorus-to-metal coordination.