Patent ID: 7241715

Claim:
A composition, comprising: a ligand characterized by the general formula: wherein each of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 , R 19 , and R 20 when present is independently selected from the group consisting of hydride, halide, and optionally substituted hydrocarbyl, heteroatom-containing hydrocarbyl, alkoxy, aryloxy, silyl, boryl, phosphino, amino, alkylthio, arylthio, thioxy, seleno, nitro, and combinations thereof; optionally two or more R groups can combine together into ring structures, with such ring structures having from 3 to 100 atoms in the ring not counting hydrogen atoms; B is a bridging group having from one to 50 atoms not counting hydrogen atoms; X and X′ are the same or different and are independently selected from the group consisting of oxygen, sulfur, and —PR 30 —, where R 30 is selected from the group consisting of hydride, halide, and optionally substituted hydrocarbyl, heteroatom-containing hydrocarbyl, silyl, boryl, alkoxy, aryloxy and combinations thereof; Y and Y′ are the same or different and are independently selected from the group consisting of optionally substituted amino, phosphino, hydroxy, alkoxy, aryloxy, alkylthio, arylthio and thioxy; a metal precursor compound characterized by the general formula M(L) n where M is a metal selected from groups 3–6 and Lanthanide elements of the Periodic Table of Elements, each L is a moiety that forms a covalent, dative or ionic bond with M; n is 1, 2, 3, 4, 5, or 6; and optionally, at least one activator.