APPLICATION OF QUANTITATIVE STRUCTURE-RETENTION RELATIONSHIPS (QSRR) TO ELUCIDATE MOLECULAR MECHANISM OF RETENTION ON THE NEW STATIONARY PHASES FOR HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY

Quantitative structure-chromatographic retention relationships (QSRR) are ones of the most extensively studied manifestations of linear free -energy relationships (LFER). Applying the QSRR approach the chromatog raphic column can be regarded as a ''free-energy transducer'' translat ing differences in chemical potentials of analytes resulting from diff erences in their structure to differences in chromatographic retention . Based on the QSRR analysis it is possible to identify the structural factors dominating the interactions of analyte molecules with the che mical components of the chromatographic systems. To a study the new co lumn fillings were subjected which differed in the nature of a solid s upport material and of an organic ligand: phases with polyethylene imm obilized on silica, alumina and zirconia as well as both monomeric and polymeric octadecylsilica and N-acylaminopropylsilica. On these phase s the retention factors were determined for a series of 26 test solute s. For the analytes tested the empirical solvatochromic structural des criptors were acquired as well as the descriptors from molecular model ling. The QSRR equations derived prove higher polarity of the polyethy lene phases based on silica with regards to the phases based on alumin a and zirconia as well as a higher polarity of N-acylaminopropylsilica phases as compared to octadecylsilica phases.