Abstract
A new stationary phase for gas chromatography, dimeric rhodium (II) benzoate, was found to interact rapidly and reversibly with sigma donor molecules such as ethers, ketones and esters, thereby considerably increasing their retention volumes. In addition, interaction and separation of olefins has been achieved with the same phase. The specific interaction of olefins with the rhodium (II) complex is particularly interesting since the relative retention increase is quite different than that for rhodium (I) and silver (I). Furthermore, an “inverse” steric effect is observed as the interaction of olefins increases with increasing alkyl substitution at the double bond. The mechanism of interaction involved and the analytical applications are briefly discussed.
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