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A new type of clay column particles was prepared, in which a hectorite layer (∼0.1 µm thickness) covered uniformly the surface of amorphous silica particles with an average radius of 5 µm (ref. Okada  et al. ,  The Journal of Physical Chemistry C , 116, 21864–21869 (2012)). The hectorite layer was fully ion-exchanged with Δ-[Ru(phen) 3 ] 2+  (phen = 1,10-phenanthroline) ions by being immersed in a methanol solution of Δ-[Ru(phen) 3 ](ClO 4 ) 2  (1 mM). The modified silica gel particles thus prepared were packed into a stainless steel tube (4 mm (i.d.) × 25 cm) as a high-performance liquid chromatography column. Optical resolution was achieved when the racemic mixtures of several metal complexes or organic molecules were eluted with methanol. In the case of tris(acetylacetonato)ruthenium(III) ([Ru(acac) 3 ]), for example, the Λ- and Δ-enantiomers gave an elution volume of 2.6 and 3.0 mL, respectively, with the separation factor of 1.2. The total elution volume (5 mL) was nearly one-tenth for the previously reported column of the same size (RU-1 (Shiseido Co., Ltd.)) packed with the spray-dried particles of synthetic hectorite (average radius 5 µm) ion-exchanged by the same Ru(II) complexes.

Application of Hectorite-Coated Silica Gel Particles as a Packing Material for Chromatographic Resolution