Temperature-induced inversion of elution order in the chromatographic enantioseparation of 1,1'-bi-2-naphthol on an immobilized polysaccharide-based chiral stationary phase.

作者: Bixia Yao , Fengping Zhan , Guangyan Yu , Zhifen Chen , Wenjing Fan

DOI: 10.1016/J.CHROMA.2009.05.032

关键词:

摘要: In this work, the enantioseparations of 1,1'-bi-2-naphthol (BINOL) and its three derivatives were performed on an immobilized polysaccharide-based chiral stationary phase, Chiralpak IA, under normal-phase mode. The effects content polar modifier in mobile phase column temperature retention enantioseparation investigated detail. Temperature-induced inversion elution order for BINOL was observed directly when n-hexane/2-propanol (92/8, v/v) used as phase. isoenantioselective (T(iso)) calculated to be 31.4 degrees C. When n-hexane/2-propanol/THF (93/2/5, v/v/v) T(iso) value decreased -8.2 Entropically driven which had practical application obtained successfully (separation factor being 1.189 1.332 at 25 C 50 C, respectively). corresponding thermodynamic parameters other binaphthyl compounds compared with that BINOL. Some inferences about recognition mechanism stressed.

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