Effect Of Water Molecules Research Articles

Coordination polymers from polycondensates and metal oxides. II. Effect of water molecules on the reactions of polyesters with Mgo and Zno

AbstractPolyester molecules containing free carboxyl end‐groups react with MgO and ZnO as polydendate ligands to form donor–acceptor complexes, followed by the increase in molecular weight of the original polyester. The role of water in these coordination reactions was studied. It was demonstrated that the water can catalyze the reactions by promoting an ionization effect. In some case it can coordinate to the metal compound and effectively compete with the other ligands present.

Optical absorption in crystals and solutions of potassium halides with lead halide impurity

Using a spectrophotometric method of determining lead concentrations, the relation between the optical absorption of alkali-halide crystals with PbCl2 impurity and that of the corresponding aqueous solutions was investigated. It was shown that the differences in the position of absorption maxima of (MHaln)m- complexes are determined by the effect of water molecules, and not by the structure of the complexes. It is established that the long-wave absorption band in the crystal (273 nm in KCl + PbCl2) is due to the interaction of lead ions with anions, independently of the nature of the distribution of the impurity in the crystal.