Effects of ions on the liquid crystalline mesophase of transition-metal salt: surfactant (CnEOm)

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dc.citation.epage8446en_US
dc.citation.issueNumber24en_US
dc.citation.spage8439en_US
dc.citation.volumeNumber108en_US
dc.contributor.authorDag, Ö.en_US
dc.contributor.authorAlayoǧlu, S.en_US
dc.contributor.authorUysal, İ.en_US
dc.date.accessioned2016-02-08T10:26:44Z
dc.date.available2016-02-08T10:26:44Z
dc.date.issued2004en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractThe transition-metal aqua complex salts [M(H2O) x]Y2 (where M is some of the first- and second-row transitionmetal ions and Y is Cl-, NO3-, and ClO4- counteranions) form liquid crystalline (LC) mesophases with oligo(ethylene oxide) nonionic surfactants (CnH 2n+1(CH2CH2O)mOH, denoted as C nEOm). The structure of the [M(H2O) x]Y2:CnEOm mesophase is usually 2D hexagonal in nitrate systems, cubic in perchlorate systems, and absent in the chloride systems. The solubility of the metal aqua complex salt follows the Hofmeister series in a [M(H2O)x]Y2:C nEOm mesophase. However, the nitrate ion interacts with the metal center as a bidentate and/or unidentate ligand, therefore reducing the ion density (and/or ionic strength) of the LC medium and further enhancing the solubility of nitrate salt in the LC systems. The cobalt chloride salt is the only soluble chloride salt that undergoes ligand-exchange reactions in the [Co(H2O)6]Cl2:CnEOm system. In an LC mesophase, anions have a greater influence on the hydrophilicity of nonionic surfactants than do cations. The structure and stability of the LC mesophase can be controlled by controlling either the hydrophilicity of the nonionic surfactant (by choosing the right anion type) or the ion density of the medium (by either influencing the equilibrium between the free and coordinated anions or balancing between the coordinating and noncoordinating anions in the medium).en_US
dc.identifier.doi10.1021/jp049716xen_US
dc.identifier.issn1520-6106
dc.identifier.urihttp://hdl.handle.net/11693/24274
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp049716xen_US
dc.source.titleJournal of Physical Chemistry Ben_US
dc.subjectComplexationen_US
dc.subjectCoordination reactionsen_US
dc.subjectCrystallizationen_US
dc.subjectHydrophilicityen_US
dc.subjectNitratesen_US
dc.subjectSolubilityen_US
dc.subjectSurface active agentsen_US
dc.subjectSynthesis (chemical)en_US
dc.subjectBinary systemsen_US
dc.subjectMetal centersen_US
dc.subjectNonionic surfactantsen_US
dc.subjectPerchlorate systemsen_US
dc.subjectLiquid crystalsen_US
dc.titleEffects of ions on the liquid crystalline mesophase of transition-metal salt: surfactant (CnEOm)en_US
dc.typeArticleen_US

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