Patent ID: 7230107

Claim:
A complex of the formula: wherein: M is selected from Ti, Zr, Hf, Nb, Re, Sn, and Ge, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are each independently F, Cl, CF 3 , diarylamine, carbazolyl, alkoxy, cyano, alkyl or aryl; and a, b, c, d, e, f, g, and h are each 0, 1, 2, or 3; provided that at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 is diarylamine or carbazolyl and furthermore, a, b, c, d, e, f, g and h can not be 0 simultaneously.