complexation reaction

complexation reaction

[‚käm·plek′sā·shən rē‚ak·shən]
(chemistry)
A chemical reaction that takes place between a metal ion and a molecular or ionic entity known as a ligand that contains at least one atom with an unshared pair of electrons.
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Meanwhile, the work also aims to optimize the complexation reaction conditions, determine the solubility of the Zinc(II)-hesperidin complex and establish an easy spectrophotometric method for hesperidin determination in commercial juice.
This increase in entropy suggests that the complexation reaction is spontaneous.
Biosorption of this metal is based on ions associating with the cell surface wherein ion exchange and complexation reaction with functional groups like carboxyl, amides, hydroxyl, phosphate, and sulphydryl groups occur [8].
Since the nature of solvent may strongly influence the stoichiometry and formation constant of transition metal complexes in solution, we decided to study the complexation reaction between the N,N'-Bis-(salicylidene)1,8-diamino-3,6-dioxaoctan Schiff base ligand (L) (Figure 1) and some transition metal ions in acetonitrile solvent.
A simple, accurate and indirect spectrophotometric method was developed for the quantification of cephalexin in pure form and pharmaceutical products using complexation reaction. The developed method is based on the oxidation of the cephalexin with Fe3+ in acidic medium.
Therefore, a complexation reaction of the used alginate and zinc and copper ions can be concluded.
Toward a Better Understanding of the Regioselectivity of the A1 (III)-Protocatechuic Acid Complexation Reaction. Journal Physical Chemistry American, 112: 9829-9834.
Based on findings of Neeraj and coworker, there is a complexation reaction between copper(II) ion and imidazole ring in presence of phosphate buffer [45].
The presence of the acid seems indeed to be necessary to achieve rapidly the complexation reaction. One can hypothesize that the protons from TfOH protonate the aromatic nitrogen bearing the two other chelating rings inducing a conformational change, which is thermodynamically unfavoured, followed by a proton-metal exchange giving more rapidly the [[Cd[(L).sub.2]].sup.2+] complexes.
Therefore, the ammonium group of the clay modifier might take part in the amine complexation reaction and thus facilitate the curing reaction of NR.
studied the adsorption of Eu(III) on alumina, which was also influenced by the pH changes, and the reaction is a surface complexation reaction [4].