| http://www.w3.org/ns/prov#value | - Of these cobalt compounds (A), preferable are cobalt complexes having organic phosphine compounds as ligands, for example, cobalt-phosphine complexes such as cobalt bis(triphenylphosphine) dibromide, cobalt bis(triphenylphosphine) dichloride, cobalt bis(tri-m-methylphenylphosphine) dibromide, cobalt bis(tri-m-methylphenylphosphine) dichloride, cobalt bis(tri-p-methylphenylphosphine) dibromide, cob
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