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- W2164920005 abstract "Salen-type ligands comprised of ethylenediamine or 1,2-cyclohexenediamine, along with an salicylaldehyde bearing a methyl substituent on its 3-position and a −[CR(CH2CH2CH2N+Bu3)2] (R = H or Me) on its 5-position, unexpectedly afford cobalt(III) complexes with uncoordinated imines. In these complexes, two salen−phenoxys and two 2,4-dinitrophenolates (DNPs), which counter the quaternary ammonium cations, coordinate persistently with cobalt, while two other DNPs are fluxional between a coordinated and an uncoordinated state in THF at room temperature. The complexes of this binding mode show excellent activities in carbon dioxide/propylene oxide copolymerization (TOF, 8 300−13 000 h−1) but with some fluctuation in induction times (1−10 h), depending on how dry the system is. The induction time is shortened (<1.0 h) and activity is increased ∼1.5 times upon the replacement of the two fluxional DNPs with 2,4-dinitrophenol-2,4-dinitrophenolate homoconjugation ([DNP···H···DNP]−). Imposing steric congestion either by replacing the methyl substituent on the salicylaldehyde with tert-butyl or by employing H2NCMe2CMe2NH2 instead of ethylenediamine or 1,2-cyclohexenediamine results in conventional imine-coordinating complexes, which show lower activities than uncoordinated imine complexes." @default.
- W2164920005 created "2016-06-24" @default.
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- W2164920005 date "2009-09-25" @default.
- W2164920005 modified "2023-10-12" @default.
- W2164920005 title "Elucidation of the Structure of a Highly Active Catalytic System for CO<sub>2</sub>/Epoxide Copolymerization: A salen-Cobaltate Complex of an Unusual Binding Mode" @default.
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- W2164920005 doi "https://doi.org/10.1021/ic901584u" @default.
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