Preparation and Characterization of a New p-tert-Butyl-calix[8]arene-bonded Stationary Phase for High-Performance Liquid Chromatography

Abstract

A new p-tert-butyl-calix [8]arene-bonded silica gel stationary phase (CABS) was prepared via 3-glycidoxypropyltrimethoxysilane as a coupling reagent for HPLC. Its structure was characterized by diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), elemental analysis and thermal analysis. The chromatographic performance of new packing was evaluated by using basic, acidic and neutral aromatic compounds as probes compared with conventional ODS. The results show that the new stationary phase has an excellent reversed-phase property and high selectivities for substituted aromatics compared with ODS, because CABS can provide various sites for the analytes, such as hydrogen-bonding interactions, π-π interactions, and inclusion complex, besides hydrophobic interactions.

Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers

“…Calix­[8]­arene monolayer shows characteristic peaks at 1470 and 1536 cm –1 which are assigned to the band of benzene ring. The peaks of C–H stretching frequency appear at 2858 and 2955 cm –1 , whereas the peaks of C–H bending frequency appear at 1295 and 1368 cm –1 . For Porphyrin monolayer, the N–H stretching frequency is found to be weak at 3350 cm –1 which contains hydrogen bonding in the condensed ring systems.…”

“…The peaks of C−H stretching frequency appear at 2858 and 2955 cm −1 , whereas the peaks of C−H bending frequency appear at 1295 and 1368 cm −1 . 41 For Porphyrin monolayer, the N−H stretching frequency is found to be weak at 3350 cm −1 which contains hydrogen bonding in the condensed ring systems. The peaks at 2850−3140 cm −1 are due to C−H stretching vibrations.…”

Preparation and characterization of a p-tert-butyl-calix[6]-1,4-benzocrown-4-bonded silica gel stationary phase for liquid chromatography

“…As can be seen in Table 4, the elution orders for most solutes on the two packings were similar, which indicates that the same moieties of the calix [6]arenas result in the similar chromatographic selectivities for the isomers. Making a comparison between CR6BS and a p-tert-butyl-calix [8]arene-bonded phase with 0.071 mmol g −1 bond amount and similar spacer [36,37], it can also be found that the k values of the isomers on CR6BS (shown in Table 4) were small, which are mainly related to the sizes of the cavities.…”

Synthesis of the artemisinin‐imprinting polymers on silica surface and its adsorption behavior in supercritical CO2 fluid

“…The calix [4]arene was grafted on silica surface (CABS) according to the reported literature. 20,21 The preparation process is shown in Figure 1. With 100 ml toluene, 12.5 ml GPTMS, 10 g activated silica particles, and 0.25 ml triethylamine (as a catalyst) were mixed, and the mixture was refluxed for 8 h at 80 C with nitrogen protection.…”