Dimethyltin(IV) complexes with zwitterionic buffers (Mes and Mops)

Add time:08/08/2019    Source:sciencedirect.com

Equilibrium studies in aqueous solution are reported for dimethyltin(IV) complexes of the zwitterionic buffers “Good’s buffer”, such as Mes and Mops (L). Stoichiometry and stability constants for the complexes formed were determined at different temperature and ionic strength 0.1 M NaNO3. The results showed the best fit of the titration curves were obtained when complexes ML, MLH−1, MLH−2, and MLH−3 were expected beside the hydrolysis products of the dimethyltin(IV) cation. The thermodynamic parameters ΔH°, ΔS° and ΔG° calculated from the temperature dependence of the formation constant of the dimethyltin(IV)–Mes complex was investigated. The effect of dioxane as a solvent on the formation constants of dimethyltin(IV)–Mes complex was discussed. The concentration distribution of the various complex species was evaluated as a function of pH. The bonding sites of the dimethyltin(IV) complexes in solid state with Mes and Mops were characterized by means of elemental analyses and FTIR. The NMR (1H, 13C) spectra of the DMT–Mes complex exhibits the strongly distorted octahedron geometry around tin atom. Also, thermal analyses (TGA and DTA) were discussed. Thermodynamic parameters such as activation energy (Ea), pre-exponential factor (A), entropy of activation (ΔS∗) and free energy of activation (ΔG∗) have been calculated for each step, employing integral method Coats and Redfern. The reaction enthalpy (ΔH) is obtained from DTA data.

We also recommend Trading Suppliers and Manufacturers of DIMETHYLTIN (++) (cas 16408-14-3). Pls Click Website Link as below: cas 16408-14-3 suppliers

Prev:Medium effect on the dimethyltin(IV) complexes of 2-(N-morpholino) ethanesulfonic and 3-(N-morpholino) propanesulfonic acid
Next:Synthesis, structural characterization and crystal structure of some dimethyltin complexes containing substituted 1,10-phenanthroline)