Electron-sponge behavior and electronic structures in cobalt-centered pentagonal prismatic [Co.sub.11][Te.sub.7][(CO).sub.10] and [Co.sub.11][Te.sub.5][(CO).sub.15] cluster anions

The description of a novel anionic hybrid carbonyl-telluride cobalt cluster belonging to the rare type of pentagonal-prismatic [M.sub.10] polyhedral geometry is presented. It is observed that the interactions of the CO-bridging half-shell with [[Cp*].sub.2]Nb[(CO).sub.2].sup.+] cations gives rise to the formation of supramolecular networks containing ribbons of anions and cations.