Abstract
The chromatographic R M values for some styryl cyanine iodides derived from pyridine were obtained by thin-layer chromatography using propanol—water—acetic acid solvent systems in various proportions. Linear free energy relationship studies were carried out with some electronic, steric and lipophilic parameters, either singly or in combination with each other. The results indicate that the steric factor has the greatest influence on the chromatographic behaviour. An attempt was made to establish the nature of dye-substrate adsorption by correlation with the theoretical charge densities (CNDO/2 and INDO).
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