investigate formation constant of some amino acids by p-sulphonato-calix (4) arene in aqueous solution

Investigate formation constant of some Amino Acids by p-sulphonato-calix (4) arene in Aqueous Solution

The formation constants (log K), of the complexes formed between a number of amino acids(glycine , L-valine and L-alanine) with p-sulfonatocalix [4] arene at varying temperatures (25± 0.1to 65 ± 0.1 °C) in aqueous solutions and at natural pH of p-sulphonato-calix [4] arene (pH=3.2) bymeans of UV-Vis spectrophotometeric technique have been investigated. At this pH the guestmolecule is in its cat...

Thermodynamic study of dioxovanadium (V) Complexes with p-sulphonato-calix [6] arene in aqueous solution

thermodynamic study of dioxovanadium (v) complexes with p-sulphonato-calix [6] arene in aqueous solution

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Determination of the acid dissociation constants of the p-sulphonato-calix[4]arene

The acid dissociation constants of the hydroxyl groups in 25, 26, 27, 28-tetrahydroxy-5, 11, 17, 23-tetrasulphonic-calix[4]arene (SC4) were determined at 25οC by a combination of potentiometric and spectrophotometric titration method. The first and second acid dissociation constants (pKa1, pKa2) were found to be 3.19 and 12.1, which demonstrated pKa shift due to intramolecular hydrogen bonding ...

Molecular recognition by calix[4]arene-modified gold nanoparticles in aqueous solution.

The concept of exploiting metal clusters for nanotechnology applications dates back to the development of the original Au55 cluster by Schmid et al. in 1981. Over the past decade, socalled monolayer protected clusters (MPCs) of gold and, to a lesser extent, silver have been studied extensively owing to their extreme stability and the plethora of tunable properties that are controlled by the par...

The pH effect on complexation of Alkali metal cation by p-sulfonatocalix (4) arene in aqueous solution

The complexation of Alkali metal cations by the water-soluble p-sulfonic acid calix(4)arenewas thermodynamically characterized using spectrophotometeric data which are consistentwith the formation of a 1:1 complex resulting from electrostatic interactions between thesulfonato groups and alkali metal cations. In this study, we determined the formationconstants (log K) of the complexes and have c...