Journal of Chromatography A 2005-12-16

Chelates of cobalt(III) and iron(II) with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol as test probes for the characterization of chromatographic effects on a reversed-phase liquid chromatography stationary phase.

Sławomir Oszwałdowski

Index: J. Chromatogr. A. 1099(1-2) , 111-20, (2005)

Full Text: HTML

Abstract

The chromatographic effects on a reversed-phase liquid chromatography (RPLC) phase were established with the use of chelates system: cobalt(III) and iron(II) with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol as the test probes. Both chelates have the same octahedral structure, M:L = 1:2, the former chelate is cationic and can be used to probe the ion-exchange phenomena on a RPLC phase, whereas the latter is not charged and can be used as reference molecule with respect to the charged one. Based on well-established LC phenomena referred in the literature, the suitability of the chelate system for examining some chromatographic effects was tested. It was concluded that the proposed test method is sensitive towards the ion-exchange phenomena on the LC phase and the hydrogen bonding between the solvent eluent and the LC phase. In addition, chromatographic effects due to the presence of ultrasonic field or due to the presence of aromatic amines in the eluent were observed with the help of the proposed test method. Based on molecular computation, the properties of chelates were compared with properties of quaternary amines, the probes most frequently used for testing LC phases, and the possible differences in an interaction of the mentioned compounds with a surface of a RPLC phase were indicated.

Related Compounds

  • 2-(5-bromo-2-pyrid...

Related Articles:

Determination of Lead in Water Samples Using a New Vortex-Assisted, Surfactant-Enhanced Emulsification Liquid-Liquid Microextraction Combined with Graphite Furnace Atomic Absorption Spectrometry.

2016-04-01

[Arch. Environ. Contam. Toxicol. 70 , 607-14, (2016)]

Development of an extractive spectrophotometric method for estimation of uranium in ore leach solutions using 2-ethylhexyl phosphonic acid-mono-2-ethylhexyl ester (PC88A) and tri-n-octyl phosphine oxide (TOPO) mixture as extractant and 2-(5-bromo-2-pyridylozo)-5-diethyl aminophenol (Br-PADAP) as chromophore.

2012-06-01

[Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 91 , 222-7, (2012)]

Flame atomic absorption spectrometric determination of trace amounts of manganese in alloys and biological samples after preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenylborate on microcrystalline naphthalene or by column method.

2001-08-01

[Anal. Sci. 17(8) , 969-73, (2001)]

Modulation by Zn2+ of GABA responses in bipolar cells of the mouse retina.

2000-01-01

[Vis. Neurosci. 17(2) , 273-81, (2000)]

Simple regression model using an optode for the simultaneous determination of zinc and cadmium mixtures in aqueous samples.

2001-01-01

[Anal. Sci. 17(1) , 181-6, (2001)]

More Articles...