V. Danube Symposium on Chromatography, Yalta, November 11-16, 1985. TLC on silica, impregnated with 5 % paraffin oil in hexane, developed with methanol - water with different organic phase ratio in the mobile phase.

J. Chromatogr. 365, 145 -153 (1986). Investigation of the relationships between logarithmic retention factors and carbon atom numbers for some homologous series of the title compounds in TLC and GC systems. The chromatographic behaviour of the compounds could be explained on the basis of their structural properties. Reversed-phase. RM values and Kovßts retention indices showed linear correlation with the carbon atom numbers of homologous species. In silica chromatography, these correlations were non-linear in several cases.

J. Chromatogr. 475, 321-329 (1989). Reversed-phase TLC of aromatic alkoxy and hydroxy acids on octadecyl-bonded silica with mixtures of phosphate buffer and methanol. Correlation of RM in TLC with log in HPLC. Examination of the elution order with respect to the structures of the acids. Use of the experimental data to optimize the separation of the acids.

J. Chromatogr. 520, 217-222 (1990). Measurement of the RM values of 26 triphenylmethane derivatives by reverse phase TLC on silica, impregnated with 5% paraffin oil in hexane, with acetone - water 4:6, 5:5, 6:4 and 7:3. Investigation of the relationship between RM values and organic phase concentration in the eluent, and the relationship between RM values and GC retention indices.

J. Planar Chromatogr. 5, 431-434 (1992). Investigation of the relationships between solute structure and chromatographic behavior of azine and diazines. TLC of 2,2'-bipyrazyl, 2,2'-biquinoxalyl, 2,2'-bipyridyl, 2,2',2'-tripyridyl, quinoline, 2,2'-biquinolyl, 2-methylquinoxaline, 3,3'-dimethyl-2,2'-biquinoxalyl and g,g'-bipicolyl on Kieselguhr impregnated with a 20% solution of formamide in acetone or with solutions of formamide in acetone containing formic acid. Benzene, trichloroethylene, hexane, chloroform, or heptanol were used as monocomponent mobile phases. Visualization with Dragendorff followed by additional spraying with 18 m sulfuric acid.

J. Chromatogr. 675, 282-285 (1994). Reverse-phase TLC of title compounds on RP-18 with methanol -water in different proportions. Detection under UV 254 nm. study of the correlation between RM values and methanol molar fraction (X), and between ao [=(RM)x=0] and the partition coefficient (log P).

Part IX. J. Planar Chromatogr. 8, 454-459 (1995). TLC separation of selected isomeric methylphenols on silica. Correlation of RM and topological indices log 1/C with the hydrophobic constant n, with pKa values, and with numerical values of the topological indexes. - TLC of methylphenols (e.g. phenol, 2,6-, 2,4-, 2,5- 3,5-dimethylphenol, 2,4,6- and 2,3,5-trimethylphenol) on silica with 0.1 M potassium dihydrogen phosphate in 30% methanol (pH 7.00), 1 M NH3 in 30% methanol (pH 11.30), and 0.1 M acetic acid and 0.1 M sodium acetate in 30% methanol (pH 5.00). Detection with 2% methanolic ferric chloride solution or a 20% titanium tetrachloride solution in concentrated hydrochloric acid followed by heating at 120°C for 30 s or 2 min.

Chinese Anal. Chem. (Fenxi Huaxue) 23, 1182 (1995). Presentation of an equation for correlating the TLC retention values and carbon numbers under defined conditions.