Patent number: 7230107
Abstract: Provided are complexes of the formula: wherein: M is selected from Ti, Zr, Hf, Nb, Re, Sn, and Ge, R1, R2, R3, R4, R5, R6, R7, and R8 are each independently F, Cl, CF3, 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 R1, R2, R3, R4, R5, R6, R7, and R8 is diarylamine or carbazolyl; or R1, R4, R5, and R7 are not all the same; or R2, R3, R6, and R8 are not all the same.
Type:
Grant
Filed:
December 15, 2005
Date of Patent:
June 12, 2007
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Norman Herron, Ying Wang