Patent ID: 7851569

Claim:
A rare earth metal complex represented by the formula (1): wherein A represents a Group 14 element of the periodic table, Cp represents a group having a substituted or unsubstituted cyclopentadienyl anion moiety, Ln represents a Group 3 metal atom or a lanthanoid metal atom, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are the same or different, and represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, a silyl group substituted with a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an aralkyloxy group having 7 to 20 carbon atoms, or an amino group substituted with a hydrocarbon group having 1 to 20 carbon atoms, R 7 represents an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, Provided that, in R 1 to R 7 , the alkyl group, the aryl group, the aralkyl group, the alkoxy group, the aryloxy group, the arylkyloxy group or the hydrocarbon group may be substituted with a halogen atom, R 1 and R 2 may be bonded together to form a ring, adjacent groups of R 3 , R 4 , R 5 and R 6 may optionally be bonded together to form a ring, respectively, m Xs are the same or different, and represent a monoanionic ligand, n Ys are the same or different, and represent a neutral ligand, m represents an integer of 1 to 3, and n represents an integer of 0 to 3.