DIMERIC COMPLEX COMPRISING RARE EARTH METAL AND METHOD FOR MANUFACTURING THE SAME

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The present invention relates to a dimeric complex compound comprising rare earth metals represented by chemical formula 1 which can be used as a catalyst for polymerization of butadiene rubber, and to a manufacturing method thereof. (In chemical formula 1, M represents a 3B-group element of the periodic table. E is a linear or branching alkylene group of C_3 to C_30 or an aryl group of C_6 to C_20. R_1 is a linear or branching alkyl group of C_3 to C_30.)