Patent ID: 7705157

Claim:
A compound that is a metal ligand complex characterized by the general formula: wherein each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 are the same or different and are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, halo, silyl, boryl, phosphino, amino, thioalkyl, thioaryl, nitro, and combinations thereof, with the proviso that R 1 may not be hydrogen, and optionally two or more of R 1 , R 2 , R 3 and R 4 may be joined to form a fused ring system having up to 50 atoms, not counting hydrogen atoms; X 1 is C, X 2 is O, S, N or CR 5 , X 3 is O, S, N or CR 6 , and X 4 is CR 7 , provided that the heteroatom containing ring system is heteroaromatic, and provided that when X 2 is S, R 7 is aryl; wherein M is a metal selected from the group consisting of groups 3 through 6 of the periodic table elements and lanthanides; wherein each L is independently selected from the group consisting of hydrogen, halogen, optionally substituted alkyl, heteroalkyl, allyl, diene, alkenyl, heteroalkenyl, alkynyl, heteroalkynyl, aryl, heteroaryl, alkoxy, aryloxy, boryl, silyl, amino, phosphino, ether, thioether, phosphine, amine, carboxylate, alkylthio, arylthio, 1,3-dionate, oxalate, carbonate, nitrate, sulphate, and combinations thereof; x is 2, the complex being a bis-ligand complex comprising a first phenol-heterocycle ligand and a second phenol-heterocycle ligand, wherein the first and second phenol-heterocycle ligands are different from the other; and m″ is 0, 1, 2, 3, or 4.