Design of New Materials starting from Organometallics

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1)Rare earth metal complexes bearing dimethylsilylene bridged bulky cyclopentadienyl ligand have been synthesized and the polymerizations of ethylene, 1-pentene and 1-hexene were performed. As a result, high polymers of ethylene exceeding M_n of 400,000(molecular weight distribution 1.6)and of 1-pentene or 1-hexene exceeding M_n of 60,000(molecular weight distribution 1.7)were obtained. As a tytpical example of bulky rare earth metal complexes, characterization of Me_2Si[2(3), 4-(SiMe_3)_2C_5H_2]_2SmCH(SiMe_3)_2 has been made by X-ray analysis.2)Copolymerizations of an optical active lactone, MOHEL, with caprolactone and varelolactone were performed with ALEt_3-H_2O catalystsystem. In any copolymers with the ratio of 30 : 70, biodegradation with active sludge or enzymes easily occurred as compared with respective homopolymers. Biodegradation of L- and L/D lactide copolymers was also studied.3)Steam invigoration at 1000ﾟC of Cp_3Ln mixed pitch gave new carbon materials with high mesopore ratio. Absorption of high molecular weight substances such as vitamine B_<12>.dyes, maltooligosaccharides, cyclodextrin, and humic acid occurred with the resulted carbon materials has been examined.