Patent ID: 8278238

Claim:
A compound of formula II wherein X1 is CR′, wherein R′ is selected from the group consisting of A1, CN, NA1A2, OA1, SA1, F, Cl, Br, I, SO 2 A1, CNO, NCO, CA10, and COOA1 wherein A1 and A2 are selected from the group consisting of substituted(hetero)alkyl, (hetero)aryl and H, X2 is selected from the group consisting of NR′ and S, wherein R′ is selected from the group consisting of (hetero)alkyl, (hetero)aryl or H, R1 to R5 are independently selected from the group consisting of A1, CN, NA1A2, OA1, SA1, F, Cl, Br, I, SO 2 A1, CNO, NCO, CA10, and COOA1 wherein A1 and A2 are selected from the group consisting of substituted (hetero)alkyl, (hetero)aryl and H, the metal atom is selected from the group consisting of Pt, Os and Ir, n is 1 to 3 and m is 3-n for Ir and Os, n is 1 to 2 and m is 2-n for Pt as the metal atom, and is a mono-anionic saturating ligand.