Supervanadophile: Complexation, preconcentration and transport studies of vanadium by octa functionalized calix[4]resorcinarene-hydroxamic acid

Abstract

A new octa functionalized calix[4]resorcinarene bearing eight hydroxamic acid groups (OFCHA) has been synthesized and its analytical properties have been investigated. To elucidate the structure of the compound, elemental analysis, FT-IR and 1 H NMR spectral data have been used. The compound showed high affinity and selectivity for vanadium(V) in presence of large quantities of associated metal ions. The complexation of vanadium(V) with OFCHA has a 4:1 metal: ligand stoichiometry as evaluated by Job's plot. A spectrophotometric method is proposed for the extractive determination of vanadium(V) in an acidic medium in the presence of diversified matrix, and verified by ICP-AES. Under the optimum condition of acidity, solvent, interfering ions and OFCHA concentration, the molar absorptivity of the complex is 5630 l mol -1 cm -1 at 495 nm. The system obeys Beer's law over the range 0.125-8.75 μg ml -1 of vanadium(V) with Sandell sensitivity 0.009 μg cm -2 . The preconcentration factor and overall stability constant evaluated at 25 qC were 142 and 14.18, respectively. The complexation is characterized by favorable enthalpy and entropy changes. Liquid membrane transport studies of vanadium(V) were carried out from source to the receiving phase under controlled conditions and a mechanism for transport is suggested. To check the validity of the proposed method, vanadium is determined in environmental, biological samples and some standard reference materials from NIST and BCS.

Synthesis and characterization of supramolecule grafted on modified magnetic nanoparticles: new hybrid organic–inorganic phase transfer catalyst

“…These compounds are large cyclic tetramers with diverse application as macrocyclic receptors, such as dendrimers in biological systems, nanocapsules, nanoparticles, optical chemosensors, and supramolecular tectons as components in liquid crystals, molecular switches, selective membranes, HPLC stationary phase as ion channel mimics [14][15][16][17].…”

Design and Synthesis of Supramolecular Polymer Network Equipped with Pd-porphyrin: An Efficient and Recoverable Heterogeneous Catalyst for C–C Coupling Reactions

“…Based on the results of the former studies on c-methylcalix [4]resorcinarene which can be performed by suggesting some different moieties at the upper and lower rim [17], the synergetic impact of functional groups and three-dimensional cavity of scaffolding leads to the creation of novel and attractive properties. In this regard, synthesis of functionalized supramolecular structures through the functional groups which are anchored covalently onto c-methylcalix [4]resorcinarene and its polymers have attracted a lot of attention [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. On the other hand, synthesis of biaryl structural unit can be considered as one of the most fascinating reactions since there are a major number of developed materials encompassing natural, as well as some other synthetic products encompassing biaryl structural units which involved some attractive biological and pharmaceutical features.…”

A straightforward route for covalently anchored pyridinium salt onto upper rim of c-methylcalix[4]resorcinarene with selective antibacterial activity against Gram-positive bacteria

“…The synergetic effect of functional groups and three-dimensional cavity of scaffold would result in novel, improved and fascinating properties. In this regard, synthesis of functionalized supramolecular structures via covalently anchored functional groups onto c-methylcalix [4]resorcinarene and its derivatives have received considerable attention [12][13][14][15][16][17][18][19][20][21][22][23].…”