All-inorganic dinuclear cobalt complex with inorganic porphyrin type ligand

INOR 708

Shinnosuke Inami, Yoshihito Hayashi, hayashi@kenroku.kanazawa-u.ac.jp, and Kiyoshi Isobe. Department of Chemistry, Graduate School of Natural Science, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
Coordination of cyclic polyoxovanadate to transition metals have been previously investigated by our group. Here, the ligands are constructed by all-inorganic porphyrin type, [(VO3)n]n– anion which is composed by corner shared tetrahedral chain of VO3 units. At the center of the ligand, the 'Metal' may be coordinated by the oxo ligands to form an all-inorganic 'complex'. The chemistry between polyoxovanadates and polycations defines a new hetero-polyoxometalates as all-inorganic coordination chemistry. By the reaction with Co(II) metal sources in nonaqueous media, the novel di-m-oxo dinuclear cobalt complex was produced with dodecavanadate inorganic-porphyrin ring. This new type of dinuclear complex has no reactivity toward dioxygen due to the highly negative charges of the complex, unlike a traditional dinuclear cobalt complex which have been known to form various type of dioxygen complexes.