Meng Ling-zhi

The synthesis of a new type of calix[4]arene with chiral pendant

Two new chiral calixarenes were synthesized by condensing 1,3-bis-chlorocarbomethyl-calix[4] arenes with (1S, 2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediol, a by-product from antibiotic industry, and were characterized by1H-NMR, MS-FAB, and elemental analysis. The1H-NMR spectra show that those molecules assume a cone conformation in solution.

Porous spherical cellulose composites coated by aluminum (III) oxide and silicone: Preparation, characterization and adsorption behavior

Porous spherical cellulose composite (PSCA) coated by aluminum (III) oxide was prepared and modified by organosilicone. SEM images of the surface morphology of the bead cellulose shows that it has spherical shape and abundant porous structure on its surface. The mapping images, of aluminum and silicon of the composite (PSCAS) present aluminum (III) oxide and silicone are uniformly dispersed on the surface. The adsorption behavior of PSCAS toward metal ions was determined.

Cellulose Beads Modified by Histidine:Preparation and Adsorption Behavior

Porous cellulose beads modified by histidine (PCBH) were prepared. The adsorption capacity of PCBH for divalent Mg(II), Cu(II), Pb(II) and Hg(II) ions were determined. The effects of the temperature, the initial pH value, the concentration of metal ion and PCBH ligand on the adsorption of Cu(II) Hg (II) were discussed. The adsorption process fitted to Freundlich adsorption isotherms for both metal ions. Adsorption rate constants were also found.

Synthesis and characterization of new calix[4]arene amino acid ester derivatives and their metal extraction properties

A new type of calix[4]arenes containing amino acid ester derivatives has been synthesized. Their1H NMR characteristics are discussed. Metal ion extraction experimental has shown that calix[4]arene amino acid esters (2a, 2b) possess good extraction efficiency for transition metal ions (Cu2+, Ni2+, Zn2+) and poor extraction efficiency for alkali metal ions (Na+, K+).

A new type of dibenzoyl tartaric acid selective electrode based on polymer membrane containing calix[4]arene ionophore

A new type of dibenzoyl tartaric acid selective electrode has been developed. Three double-arm calix[4]arene derivatives were employed as the neutral ionophores. The poly(vinyl chloride) membrane electrode containing an amide derivative of calix[4]arene as the neutral carrier and a dibutyl phthalate as the plasticizer exhibited the highest sensitivity for dibenzoyl tartaric acid. The slope of linear portion was 27.8 mV per concertration decade. The electrode has a fast response and a long lifetime.