Adsorption Mode of Di-dentate Ligand Modified Zirconia Stationary Phase Surface

Abstract

Abstract: Various zirconia stationary phases were prepared by modification with di-dentate Lewis bases: dodecyl-N,N-diacetic acid(RNCC), dodecyl-N-acetic acid-N-methyleneposphonic acid(RNCP), dodecyl-N,N-dimethylenephosphonic acid(RNPP) and dodecencylsuccinic acid(RCC). The color reaction of RNPP-ZrO₂ and RNCP-ZrO₂ with ammonium molybdate indicate there are free phosphonic groups on the surface of the stationary phases, and the FTIR spectra of RNCC-ZrO₂ and RNCC-ZrO₂ indicate there are free carboxyl groups. The RCC-ZrO₂ is far more stable than RNCC-ZrO₂ under alkali station. The results of color reaction, FTIR spectra and the stability test of stationary phases suggest that, due to the chelating effect, RNCC, RNCP and RNPP adsorb on zirconia with only one carboxyl or phosphonic group, however, RCC adsorb on zirconia with two carboxyl groups.

Key words: Zirconia, HPLC stationary phase, Lewis base, Adsorption mode

CLC Number:

O657.7

TrendMD:

YAO Li-Feng, FENG Yu-Qi, DA Shi-Lu . Adsorption Mode of Di-dentate Ligand Modified Zirconia Stationary Phase Surface[J]. Chem. J. Chinese Universities, 2005, 26(2): 244.

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Adsorption Mode of Di-dentate Ligand Modified Zirconia Stationary Phase Surface

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