Application of the solvation parameter model to the characterisation of gas chromatographic stationary phases containing tris[3-(trifluoromethylhydroxymethylene)camphorato] derivatives of lanthanides

• Published in: Journal of Chromatography A Vol. 793; no. 2; pp. 390 - 396
• Main Author: Kowalski, W.J
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1998; Elsevier
• Subjects: Analytical chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Exact sciences and technology; Gas chromatographic methods; Complexation; Solvation parameter model; Stationary phases, GC; Linear solvation energy relationships; Capacity factor; Dimethylsiloxane polymer; Gas chromatography; Solvation; Correlation analysis; Organic ligand; Retention factor; Experimental study; Lanthanide Complexes; Enolate; Stationary phase
• ISSN: 0021-9673
• DOI: 10.1016/S0021-9673(97)00908-4

The solvation parameter model proposed by Abraham has been applied to retention factors, k, of over fifty different solutes on stationary phases containing tris[3-(trifluoromethylhydroxymethylene)camphorato] derivatives of Pr, Eu, Dy, Er and Yb dissolved in poly(dimethylsiloxane). Application of the solvation equation, log k=c+rR 2+sπ H 2+a Σα H 2+b Σβ H 2+l log L 16 at 393 K showed that the stationary phases studied had significant values of the descriptors ` a' and ` b' which describe the reversible complexation between lanthanide chelates and nucleophilic solutes. Increasing the atomic number of the lanthanide led to an increase of the ` a' descriptor and a simultaneous decrease of the ` b' descriptor. This behaviour was correlated with changes of the Lewis acidity of the lanthanide ions studied.