Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 이종목 | * |
dc.date.accessioned | 2016-08-28T12:08:27Z | - |
dc.date.available | 2016-08-28T12:08:27Z | - |
dc.date.issued | 2009 | * |
dc.identifier.issn | 0020-1669 | * |
dc.identifier.other | OAK-5996 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/220305 | - |
dc.description.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+Bu 3)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, 8300-13000 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 H2NCMe2CMe 2NH2 instead of ethylenediamine or 1,2-cyclohexenediamine results in conventional imine-coordinating complexes, which show lower activities than uncoordinated imine complexes. © 2009 American Chemical Society. | * |
dc.language | English | * |
dc.title | Elucidation of the structure of a highly active catalytic system for CO2/epoxide copolymerization: A salen-cobaltate complex of an unusual binding mode | * |
dc.type | Article | * |
dc.relation.issue | 21 | * |
dc.relation.volume | 48 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 10455 | * |
dc.relation.lastpage | 10465 | * |
dc.relation.journaltitle | Inorganic Chemistry | * |
dc.identifier.doi | 10.1021/ic901584u | * |
dc.identifier.wosid | WOS:000270987400065 | * |
dc.identifier.scopusid | 2-s2.0-72949095512 | * |
dc.author.google | Na S.J. | * |
dc.author.google | Sujith S. | * |
dc.author.google | Cyriac A. | * |
dc.author.google | Kim B.E. | * |
dc.author.google | Yoo J. | * |
dc.author.google | Kang Y.K. | * |
dc.author.google | Han S.J. | * |
dc.author.google | Lee C. | * |
dc.author.google | Lee B.Y. | * |
dc.contributor.scopusid | 이종목(55812178500) | * |
dc.date.modifydate | 20240415121732 | * |