On the determination of polarity parameters of silica by means of solvatochromic probe dyes

Spange, Stefan; Reuter, Anett; Vilsmeier, Elmar

doi:10.1007/bf00658910

Cited by 43 publications

(68 citation statements)

References 28 publications

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“…Therefore, the use of solvatochromic probes has been established to measure the polarity effects of environments comprising not only well-behaved solvents and room-temperature ionic liquids, [3,4] but also inorganic surfaces, [5,6] biomolecules [7][8][9] and organized media. [10] In recent decades, the Kamlet-Taft approach [11] has successfully been applied to separate the influence of non-specific chemical interactions, including electrostatic effects (dipolarity/polarizability), from specific interactions, that is, hydrogen-bonding, which are related to the molecular structure of a compound.…”

Section: Introductionmentioning

confidence: 99%

Differentiating Between Dipolarity and Polarizability Effects of Solvents Using the Solvatochromism of Barbiturate Dyes

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Differentiating Between Dipolarity and Polarizability Effects of Solvents Using the Solvatochromism of Barbiturate Dyes

et al. 2008

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“…[25] a = 0.086 m max,3 N 10 -3 [cm -1 ] + 0.486 m max,2 N 10 -3 [cm -1 ] -10. 26 (2) Chart 1. Formulas of the probe dyes used.…”

Section: Probe Dye Indicators and Determination Of The Polarity Parammentioning

confidence: 99%

“…[19,24,25] Accordingly, functionalized silicas can be well classified by this method. [26][27][28] Using solvatochromic probe dyes has several advantages: the measurements require very low concentrations of the probe molecules, can easily be done, and reproduce well. The only requirement is that the employed probe dye must adequately reflect the relevant properties of the solvent.…”

Section: Introductionmentioning

confidence: 99%

Empirical surface polarity parameters for native polysaccharides

Fischer

Spange²

2000

Macromol. Chem. Phys.

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The empirical Kamlet‐Taft solvatochromic polarity parameters α, β, and π* as well as calculated Reichardt's ET(30) values are presented for microcristalline cellulose, cellobiose, chitine, amylose, amylopectine, and glycogene. For this purpose, the following solvatochromic polarity indicators were applied: 2,6‐diphenyl‐4‐(2,4,6‐triphenyl‐1‐pyridinio)phenolate (1), [4,4′‐bis(N,N‐dimethylamino)benzophenone] (2), dicyano‐bis(1,10‐phenanthroline) iron(II) [Fe(phen)2](CN)2 (3), and 4‐aminobenzophenone (4). The polarity of the microcristalline environment of cellulose can be exactly parameterized in terms of the Kamlet‐Taft α, β, and π* values. The analogy of these values to those of the model compound cellobiose and of other independent literature data, i.e. calculated π* values via LSE (Linear Solvation Energy) relationships derived from FTIR and fluorescence measurements, is excellent. Microcristalline cellulose exhibit strong HBD properties and a rather low value of the dipolarity/polarizability. The substitution of the hydroxy group in the 2 position of the anhydroglucose unit of cellulose with the polarizable acetamido group (cellulose → chitine) significantly enhances the dipolarity/polarizability of the polysaccharide whereas the HBD capacity accordingly decreases. A generalized empirical polarity scale for native polysaccharides is suggested.

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“…From the coefficients obtained from multiple linear regression analyses they determined the so-called ,characteristic interaction constants' for the stationary phases, which measure the phases' lipophilicity, dipolarity/polarizability, hydrogen-bond (HB)-accepting basicity and HB-donating acidity. Other recent studies on the interaction properties of LC stationary phases by the LSER approach include works by Valko et al [20], Sandi and Szepesy [21,22], Spange et al [23][24][25], Reta et al [26], and A1-Haj et al [27]. The values of these phase constants measure the combined interaction properties of both mobile and stationary phases, however, not the properties of the solvated stationary phase alone.…”

Section: Introductionmentioning

confidence: 95%

Solvatochromic characterization of Silica-based stationary phases for liquid chromatography

2000

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Key WordsColumn liquid chromatography Silica bonded phases Solvatochromic characterization Hydrogen bond acidity and basicity Dipolarity Summary UV-visible reflectance spectra of solvatochromic dyes and mobile phases with compositions in the ranges from 100 to 5 % (v/v) acetonitrile and methanol in water have been used to characterize octadecyl-, octyl-, phenyl-, cyano-, amino-, and diol-bonded silica stationary phases. Dipolarity/polarizability (re*), hydrogen-bond (HB) donor acidity (c0, and HB acceptor basicity (fi) of the stationary phases were determined in the mobile phases. Interaction properties of the stationary phases are affected both by the types of bonded moiety and by the composition of the mobile phase.

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On the determination of polarity parameters of silica by means of solvatochromic probe dyes

Cited by 43 publications

References 28 publications

Differentiating Between Dipolarity and Polarizability Effects of Solvents Using the Solvatochromism of Barbiturate Dyes

Differentiating Between Dipolarity and Polarizability Effects of Solvents Using the Solvatochromism of Barbiturate Dyes

Empirical surface polarity parameters for native polysaccharides

Solvatochromic characterization of Silica-based stationary phases for liquid chromatography

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