(eta 5-Cyclopentadienyl)(eta 4-di- and tetra-phosphorylcyclobutadiene)cobalt(I): synthesis, structure, and formation of 1-D coordination polymer.

(eta 5-Cyclopentadienyl)(eta 4-di- and tetra-phosphorylcyclobutadiene)cobalt(I) complexes were synthesized by the reaction of mono- and diphosphorylacetylenes with CpCo(CO)2, respectively. The tetraphosphoryl derivative has proved to work as a bis-bidentate ligand affording a one-dimensional coordination polymer with Ce(III).