Show simple item record

dc.contributor.authorAlbayrak, C.en_US
dc.contributor.authorGülten, G.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2016-02-08T10:15:42Z
dc.date.available2016-02-08T10:15:42Z
dc.date.issued2007en_US
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/11693/23559
dc.description.abstractTransition-metal aqua complex salts [M(H2O)6]X 2 (where M is Mn(II), Co(II), Ni(II), Zn(II), or Cd(II) and X is NO3-, Cl-, or ClO4-) can be dissolved in triblock poly(ethylene oxide) - poly(propylene oxide) - poly(ethylene oxide) copolymers (Pluronics, such as P65) to form homogeneous liquid crystalline (LC) mesophases. However, the [Co-(H2O) 6]X2:P65 LC mesophases slowly undergo phase separation into a disordered ion-free phase and an ordered ion-rich LC mesophase. The phase separation also takes place in the two-salt systems [Co(H2O) 6](NO3):[Co(H2O)6]-(ClO 4)2:P65 in which the ion-free disordered domains separate out from the initially ordered homogeneous mesophase. The phase separation results in a physical mixture of a hexagonal nitrate-rich and cubic perchlorate-rich LC and disordered ion-free domains in the mixed salt systems. The driving force in the phase separation in the [Co(H2O) 6]-X2:P65 system is Co(II)-catalyzed aerobic oxidation of P65 into ester and/or other oxidation products. The separation of ions in the [Co(H2O)6](NO3)2:[Co(H 2O)6](ClO4)2:P65 system is related to the mesostructures of the two-salt systems that are different, hexagonal in the [Co(H2O)6](NO3)2:P65 system and cubic in the [Co(H2O)6](ClO4)2:P65 system. There is no visible phase separation in the other transition-metal salt:P65 systems. The phase separation in the [Co-(H2O) 6]X2:P65 systems can also be eliminated by keeping the mesophase under a N2 atmosphere. © 2007 American Chemical Society.en_US
dc.language.isoEnglishen_US
dc.source.titleLangmuiren_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/la0622119en_US
dc.subjectBlock copolymersen_US
dc.subjectComplexationen_US
dc.subjectDissolutionen_US
dc.subjectLiquid crystalsen_US
dc.subjectOxidationen_US
dc.subjectPhase separationen_US
dc.subjectSaltsen_US
dc.subjectAerobic oxidationen_US
dc.subjectIon free phaseen_US
dc.subjectLiquid crystalline mesophasesen_US
dc.subjectMixed salt systemsen_US
dc.subjectTransition metal compoundsen_US
dc.titlePhase separation in liquid crystalline mesophases of [Co(H 2O)6]X2: P65 Systems (X = NO3-, Cl-, or ClO4-)en_US
dc.typeArticleen_US
dc.departmentDepartment of Chemistryen_US
dc.citation.spage855en_US
dc.citation.epage860en_US
dc.citation.volumeNumber23en_US
dc.citation.issueNumber2en_US
dc.identifier.doi10.1021/la0622119en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record