Patent ID: 7002013

Claim:
A Pt(II) complex having the following formula: wherein X 1 and X 2 independently are C or N; R 1 is H, C1–C8 alky, or C1–C4 perfluoroalkyl, R 2 is H, or R 1 and R 2 together are C4–C8 alkylene, or R 1 and R 2 together are bridged carbocyclic C4–C12 alkylene, when X 2 is C; R 1 is H, C1–C8 alkyl, or C1–C4 perfluoroalkyl, and R 2 is omitted, when X 2 is N; R 7 is H or methyl, R 8 is H or methyl, or R 7 and R 8 together are when X 1 is C; R 7 is H or methyl, and R 8 is omitted, when X 1 is N.