期刊
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
卷 31, 期 4, 页码 829-834出版社
KOREAN CHEMICAL SOC
DOI: 10.5012/bkcs.2010.31.04.829
关键词
Carbon dioxide; Epoxide; Salen-cobalt complexes; Quaternary ammonium salt; Polymerization
资金
- Korea government (MEST) [2009-0079207]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2009-0093826]
- National Research Foundation of Korea [2009-0079207] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ligand variation was carried out on a cobalt(III) complex of Salen-type ligand comprised of 1,2-cyclohexenediamine and salicylaldehyde bearing a methyl substituent on 3-position and -[CMe(CH2CH2CH2N+Bu3)(2)] on 5-position, which is a highly active catalyst for CO2/propylene oxide copolymerization Replacement of the methyl substituent with bulky isopropyl group resulted in alteration of the binding mode, consequently lowering turnover frequency significantly Replacement with an ethyl group preserved binding mode and activity Replacement of the tributylammonium unit with trihexylammonium or trioctylammonium, or replacement of 1,2-cyclohexenediamino unit with -NC(Me)(2)CH2N- decreased activity, even though the binding mode was unaltered.
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