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The influence of solvent structure on the reordering–resolvation of alkyl modified silica

✍ Scribed by R. K. Gilpin; P. Kasturi

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
144 KB
Volume
12
Category
Article
ISSN
1040-7685

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✦ Synopsis

The current work examines the reordering᎐resolvation of octyl modified silica in contact with binary hydro-organic solvents at near aqueous conditions. As such, it is as an extension of a number of previous investigations, that has been concerned with the influence of various stationary phase parameters on the reordering᎐resolvation of alkyl and alkylamide bonded phases under totally aqueous eluent conditions. The organic modifiers used are two structure-making solvents, methanol and acetonitrile, and two structure-breaking solvents, 1,4-dioxane and dimethyl sulfoxide. These two classes of solvents have either a positive or a negative influence on the temperature, T , where reordering᎐resolvation occurs o relative to water. Likewise, plots of T vs. mole% of the organic modifier are linear o within the concentration range where the two classes of solvents behave as either structure-making or structure-breaking agents.

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✍ Dr. Hans-Dieter Beckhaus; Prof. Dr. Christoph Rüchardt 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 249 KB 👁 1 views

cm -I. 665 I independent reflections (Siemens AED diffractometer, 0 in the range 3-23", W28 scan technique and Nb-filtered radiation. The structure was solved by direct and Fourier methods and refined by fullmatrix least-squares analysis on the basis of 3278 observed reflections [ I r 2 n ( l ) ] wi