Eluents cerium nitrate

While the type of available eluent depends upon the detection method being applied in anion exchange chromatography, a corresponding classification is not necessary in cation exchange chromatography. For the separation of alkali metals, ammonium, and small aliphatic amines, mineral acids such as hydrochloric or nitric acid are typically used as eluents, independent of whether the subsequent conductivity detection is performed with or without chemical suppression. The concentration range lies between 0.002 mol/L and 0.04 mol/L. Bachmann et al. [141] employed cerium(III) nitrate in very low concentrations as the eluent for the indirect fluorescence detection of alkali metals. 

Naphthol (378, 0.36 g, 2.5 mmol) was dissolved in methanol (20 ml) at room temperature. Nitrogen was bubbled through the solution, into which ammonium cerium(lV) nitrate (1.39 g, 2.53 mmol) in methanol (15 ml) was added with stirring until the mixture turned reddish. The mixture was evaporated in vacuo and the residue was poured into water (100 ml) at 0 C and filtered. The cmde product was purified by silica gel chromatography using a petroleum ether / diethyl ether (3 1) as an eluent to afford 329 mg (92%) of pure l,r-binaphthyl-2,2 -diol (4) as a white crystalHne solid, m.p. 215 °C. 

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