A series of Pt(II) complexes having the following formula are disclosed:
##STR1##
- X1 and X2 independently are C or N, X1 can
also locate at another position of the hexagonal ring, when X1 is N;
- R1 is H, C1-C8 alkyl, or C1-C4 perfluoroalkyl, R2 is
H, R1 and R2 together are C4-C8 alkylene, or R1 and
R2 together are bridged carbocyclic C4-C12 alkylene, when X2 is C;
- R1 is H, C1-C8 alkyl, or C1-C4 perfluoroalkyl, and R2
is omitted, when X2 is N;
- R7 is H or methyl, and R8 is omitted, when X1
is N;
- R7 is H or methyl, R8 is H or methyl, or R7
and R8 together are
##STR2##
when X1 is C.
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