Cationic metal complex, organometal catalyst having borate-based bulky anion, method for preparing the same, and method for preparing oligomer or polymer using the same

An organometal catalyst having a cationic metal complex and a borate bulky anion, and being represented by the following Formula 1:

• in Formula 1,
• M is selected from the group consisting of Al, Ga, In and Tl,
• L is each independently a coordination solvent molecule comprising a cyanide group,
• R1 to R4 are each independently hydrogen, a halogen group, or a halogen-substituted alkyl group of C1-C12,
• d is an integer of 1 to 10,
• o, p, q and r are each independently an integer of 1 to 5, and
• x and y are an integer of 1 to 4 and are the same to each other,
• wherein the organometal catalyst does not comprise a halogen salt selected from silver chloride (AgCl) lithium chloride (LiCl), sodium chloride (NaCl), potassium chloride (KCl), magnesium chloride (MgCl2), silver bromide (AgBr), lithium bromide (LiBr), sodium bromide (NaBr), potassium bromide (KBr), magnesium bromide (MgBr2), silver iodide (AgI), lithium iodide (LiI), sodium iodide (NaI), potassium iodide (KI) or magnesium iodide (MgI2).