Patent ID: 7271276

Claim:
A metal complex comprising a ligand L and a metal center M 1 , wherein M 1 is selected from the group consisting of transition metal, Li, Na, K, Mg, Ca, Al, and Ga; and the ligand L is represented by the following general formula I (a) wherein: A represents a ring or heterocyclic ring, and said ring or heterocyclic ring is unsubstituted or substituted with X 1 to X n ; X 1 to X n , for each occurrence independently represent one or more groups selected from the group consisting of hydrocarbons, PR 1 R 2 , NR 1 R 2 , OR 1 , SR 1 , and AsR 1 R 2 ; Y represents a group selected from the group consisting of PR 1 R 2 , NR 1 R 2 , OR 1 , SR 1 , and AsR 1 R 2 ; n represents an integer larger than or equal to 1; R 1 and R 2 for each occurrence independently represent saturated or unsaturated hydrocarbon or aromatic groups with or without heteroatoms of O, S, N, P or As; and the linkage between N—Y is a saturated or unsaturated hydrocarbon or aromatic group with or without substituent; and (b) wherein: the metal complex is not [NP]Li(THF) 2 ;[Me-NP]Li(THF) 2 ;[PNP]Li(THF) 2 ;[Me-MP]Ni(η 3 -CH 2 Ph).