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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 4
BKCSDE 31(4)
April 20, 2010

Title	Cobalt(III) Complexes of Various Salen-Type Ligand Bearing Four Quaternary Ammonium Salts and Their Reactivity for CO₂/Epoxide Copolymerization
Author	Bo Eun Kim, Jobi Kodiyan Varghese, Yonggyu Han, Bun Yeoul Lee*
Keywords	Carbon dioxide, Epoxide, Salen-cobalt complexes, Quaternary ammonium salt, Polymerization
Abstract	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)₂CH₂N- decreased activity, even though the binding mode was unaltered.
Page	829 - 834
Full Text	PDF

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