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Published on: May 16, 2014
Isothermal retention indices on poly(3-cyanopropylmethylsiloxane) stationary phases
Ana María Tello1, Rosa Lebrón-Aguilar, Jesús Eduardo Quintanilla-López
1Department of Structure and Molecular Dynamics, Institute of Physical Chemistry Rocasolano, Serrano 119, 28006 Madrid, Spain.
Abstract:
Experimental isothermal retention indices (I) at 348, 363, 378 and 393 K of 52 solutes of varied polarity on seven different poly(cyanopropylmethylsiloxane) stationary phases with cyanopropyl group percentages between 0% and 75% have been determined by a well-proven, accurate method. Some of these I values were obtained on new stationary phases with cyanopropyl percentages never used before. The influence of column temperature and polymer polarity on I was thoroughly investigated. Finally, retention models were developed relating I values to physicochemical and molecular properties by multiple linear regression. The best model of retention index prediction for the proposed cyanosilicones involves the Abraham's descriptors.
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