Patent ID: 8124784

Claim:
A metal complex comprising a composition represented by the following formula (a): [(Pd II ) 2 (M I ) 2 (X) 2 (L) 4 (L′) 2 ] (a) wherein M I represents Ag I , Au I or Cu I ; X represents Cl, Br, or I; L is represented by the following formula (1); and L′ is represented by the following formula (2) where two M I s may be the same or different, four Ls may be the same or different, and two L′s may be the same or different, the formulas (1) and (2) being given by: wherein R 1 , R 2 , and R 3 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group which may be substituted, an aryl group which may be substituted, or a monovalent heterocyclic group which may be substituted.