Patent ID: 7453005

Claim:
A transition metal compound represented by formula (1), wherein M is a metal element of the groups 3 to 10 of the Periodic Table or a lanthanoid; X represents a ligand having a sigma bond for binding to M, and when X is plural, the Xs may be the same or different; Y represents a Lewis base, and when Y is plural, the Ys may be the same or different; A 1 and A 2 represent crosslinking groups and at least one thereof has a boron or phosphorous atom as a crosslinking atom, the crosslinking group having a boron atom as a crosslinking atom is represented by the formula (4) and the crosslinking group having a phosphorous atom as a crosslinking atom is represented by formula (5); q is an integer of 1 to 5 and equals [(the valance of M)−2]; r is an integer of 0 to 3; and Q 1 and Q 2 have a structure represented by formula (2) or (3), and Q 1 and Q 2 may be different or the same, wherein R 1 to R 3 are a hydrogen atom, a halogen atom, a hydrocarbon group with 1 to 20 carbon atoms, a halogen-containing hydrocarbon group with 1 to 4 carbon atoms, a silicon-containing group or a hetero-atom-containing group, wherein R 4 is a hydrogen atom or a hydrocarbon group with 1 to 20 carbon atoms, wherein E is a boron atom; and R 5 is an electrically neutral basic group containing nitrogen, oxygen, phosphorous or sulfur, or a group having a negative charge containing N − , wherein E is a phosphorous atom; R 5 is a hydrocarbon group having 1 to 20 carbon atoms; and R 6 is ═N—R 7 (wherein R 7 is an alkyl group, alkenyl group, arylalkyl group or aryl group) or ═S.