화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.632, No.1, 64-69, 2016
New chiral metal-mesogenic nanosystems "silver - thiocholesterol" and their adsorption properties
New chiral matrices for thin film chromatography were obtained using hybrid metal-mesogenic nanosystems << silver - thiocholesterol >> with different metal to ligand ratio, immobilized on silica gel particles. It was shown, that heteroatomic derivative of cholesterol - thiocholesterol and its composition with small silver nanoparticles formed in the system by the chemical reduction of silver ions possess liquid crystalline cholesteric mesophase. Molar ratio between thiocholesterol ligand molecules (L) and silver (Ag) insignificantly influenced on the size of silver nanoparticles formed in the system: for molar ratio Ag : L = 1:5 the main diameter of nanoparticles was equal to (2,7 +/- 0,4) nm, for molar ratio Ag : L = 1:2 - (2, 2 +/- 0,4) nm, for molar ratio Ag : L = 1:0,5 - (2,1 +/- 0,6) nm. The new chiral matrices for thin film chromatography possess enantioselectivity related to optical isomers of 2,2-diamino-1,1-binaphtol (DABN) and trifluoroantranylethanol (TFAE). We have succeeded to select optical isomers of TFAE with selecting factor equal to 1,56.