Abstract
Several new stationary phases for normal-phase high-performance liquid chromatography were synthesized by the modification of silica gel with cobalt, nickel, zinc, and cadmium salts and subsequent calcination at 700°C. These sorbents exhibit an increase in the retention of organic compounds of the basic character, an increase in the selectivity of separation, and an eightfold increase in efficiency in comparison with initial silica gel. The experimental results were explained on the basis of the interpretation of the IR spectra of pyridine adsorbed on the synthesized and initial silica gel. It was demonstrated that the surface of silica gel modified with cadmium ions exhibits the highest acidity. The advantage of the synthesized sorbents was demonstrated with the example of the separation of fullerenes containing diethylamino and hydroxy groups.
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