Metallomesogens as stationary phases for ligand exchange gas chromatography — Part I. The use of nickel and zinc complexes of 4-decanoxydithiobenzoic acid for the separation of polycyclic aromatic hydrocarbons and dialkyl sulfides

Hu, Cho-Chun; Liu, Chuen‐Ying

doi:10.1016/0003-2670(96)00218-8

Cited by 15 publications

(1 citation statement)

References 13 publications

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“…[10]. Liu and co-workers reported a series of application in GC stationary phases: nickel-, zinc-thiolate, and copper-carboxylate complexes showing, respectively, calamitic and discotic mesophases were designed as the coating materials on the Chromosorb W for packing columns [11][12][13] and as the active moieties introducing into the polysiloxane backbone for wall-coated capillaries [13][14][15][16]. In general, the specified mesomorphic phases manifest the separation of not only geometric isomers due to the benefits of the orientated ordering of liquid crystal molecules but also analytes with electron-donating ability due to the ligandexchange interactions committed to the coordination centers of metal ions.…”

Section: Introductionmentioning

confidence: 99%

Metallomesogenic stationary phase for open‐tubular capillary electrochromatography

Chen

2006

Electrophoresis

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A synthetic coppermesogenic polymer is prepared and then covalently bonded to the siloxane-based deactivated column as the stationary phases of open-tubular CEC with essentially high phase ratio. The EOF generated from the modified phase is surveyed through conventional aqueous buffers and hydroorganic mobile phases. Zeta potentials, which are computed from the EOF data and the ratio of dielectric constant to viscosity, are plotted as a function of pH, ionic molarity, and compositional range. These plots responsible for the electroosmotic characteristic of the bonded phases are found to be like those of bare fused-silica or deactivated columns through decreasing or increasing the ACN content in the mobile phase, respectively. This two-phase characteristic is basically derived from the polymeric configuration with carboxylato ligands attached onto the polysiloxane backbone. Phthalates and amino acids are suitable probes to examine the two phenomena, more-polar and less-polar mediums, respectively, and to judge whether the chromatographic retention is the major source of separation mechanism. With the mixing modes of Lewis acid-base interaction, dispersive force, and shape discrimination, the chromatographic partition adequately accomplishes the uneasily resolved separations by only CZE mode, although the electrophoretic migration is truly somewhat involved.

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