Patent ID: 8071701

Claim:
A metal complex characterized by the formula: wherein, Y 1 , Y 2 , Y 3 and Y 4 is each independently selected from the group consisting of oxygen and sulfur, and optional donor bonds between Y 1 and M and between Y 2 and M are indicated by dashed arrows; Z is a divalent group having up to 50 atoms, not counting hydrogen atoms; each AR is a divalent aromatic group of up to 50 atoms, not counting hydrogen atoms; each T is a group having up to 30 atoms total of the general formula â€”(CR 20 2-xâ€³ ) xâ€² â€”, wherein each R 20 substituent is independently selected from the group consisting of hydrogen, halogen, hydrocarbyl, inertly substituted hydrocarbyl, and groups of the formula: Q(R 21 ) y , wherein R 21 is hydrogen, halogen, hydrocarbyl, or inertly substituted hydrocarbyl, Q is O, P, S, N, Si or B, and y is an integer from 1 to 3 equal to one less than the valence of Q; xâ€² is 1 or 2; and xâ€³ is 0 or 1; and optionally two or more R 20 substituents may be joined into a ring- or multiring-structure having from 3 to 30 atoms, provided that said ring structure is not an aromatic group; M is a metal selected from the group consisting of Groups 3-6 and Lanthanides of the Periodic Table of the Elements; n is a number from 1 to 6; and each L is a neutral, monovalent or divalent ligand containing up to 50 atoms not counting hydrogen.