prov:value
| - A mono, bis or tris (4,4'substituted 2,2'-bipyridine) complex of a metal M having the following formula (I) ##STR7## in which M represents iron, ruthenium, osmium or vanadium, R and R' are the same and each is a hydroxy or alkoxy group, or a primary, secondary or tertiary amine group, and L1', L2', L3 and L4 are ligands forming a coordination complex with the metal M, said ligands being a monodent
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