Patent ID: 6984602

Claim:
A metal complex comprising a multidentate chelating ligand, said metal complexes corresponding to the formula: where M is a metal from one of Groups 3 to 13 of the Periodic Table of the Elements, the lanthanides or actinides; T is nitrogen or phosphorus; R A independently each occurrence is hydrogen, R B or T′R B j , R B independently each occurrence is a group having from 1 to 80 atoms not counting hydrogen, which is hydrocarbyl, hydrocarbylsilyl, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, hydrocarbylamino-substituted hydrocarbyl, or hydrocarbylsilyl-substituted hydrocarbyl, and optionally the R B and R A groups bonded to the same T=C grouping may be joined together to form a divalent ligand group; j is 1 or 2, and when j is 1, T′ is oxygen or sulfur and when j is 2, T′ is nitrogen or phosphorus, R C independently each occurrence is hydrogen or a group having from 1 to 80 atoms not counting hydrogen, which is hydrocarbyl, hydrocarbylsilyl, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, hydrocarbylamino-substituted hydrocarbyl, or hydrocarbylsilyl-substituted hydrocarbyl, or two R C groups are joined together forming a divalent ligand group; X is an anionic ligand group having up to 60 atoms (excluding ligands that are cyclic, delocalized, π-bound ligand groups), and optionally two X groups together form a divalent ligand group; X′ independently each occurrence is a Lewis base ligand having up to 20 atoms; x is a number from 0 to 5; and x′ is zero, 1 or 2.