ИСТИНА

The invention relates to a carbon dioxide transition metal complex which is named as (2-(eta 5-cyclopentadienyl)-1, 1-R, phenyl-1H-imidazole-N-carbamic acid-3-3 (pentafluoro-phenyl) boron)-2 (N, N-diethylin) titanium, wherein R is hydrogen or phenyl. A preparation method of the ligand compound comprises the steps of preparing 2-(2-cyclopentyl-1, 3-or 4-diene-1-group-2, 2-R, phenyl-ethyl)-1H-imidazole, 2-(1, 1-R, phenyl)-cyclopentadienyl-1H-imidazolyl-2-(diethylin) titanium and the (2-(eta 5-cyclopentadienyl)-1, 1-R, phenyl-1H-imidazole-N-carbamic acid-3-3 (pentafluoro-phenyl) boron)-2 (N, N-diethylin) titanium. The product is taken as catalyst in vinyl polymerization reaction.