Determination and comparison of the stoichiometric stability constants of lanthanon(III) complexes with 2,4-dihydroxybenzaldehyde, 2,4-dihydroxyacetophenone and their oximes

1981

Angew. Makromol. Chem.

Synthesis and properties of a resacetophenone‐formaldehyde resin are described. The number average molecular weight of the resin determined by vapour pressure osmometry and nonaqueous conductometric titration is 2500 and 2200 g/mol, respectively. Cu(II), Ni(II) and Co(II) chelates of the resin were prepared. The elemental analysis of chelates indicated a metal to ligand ratio 1:2. From the diffuse reflectance spectra of the chelates it could be concluded that Ni(II) and Co(II) chelates have a tetrahedral structure while Cu(II) chelate has a square planar structure. Infrared spectral studies showed that the metals are co‐ordinated through the oxygen of the carbonyl and phenolic groups. The presence of methylene bridges was also indicated from IR spectral studies. The thermal properties of the resin and its metal chelates are discussed.

Resacetophenone‐formaldehyde resins, I. Metal chelates

Parmar

1981

Angew. Makromol. Chem.

Resacetophenone‐formaldehyde resins, II. Chelation ion‐exchange properties

Parmar

1981

Angew. Makromol. Chem.

The resacetophenone‐formaldehyde (RAP‐F) resin showed to be a selective chelating ion‐exchange resin for certain metal ions. A batch equilibration method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic strengths.

Synthesis and characterization of 2-hydroxy-4-methoxyacetophenoneurea-formaldehyde resins and their ion-exchange properties

Proc. Indian Acad. Sci. (Chem. Sci.)

1990

Resins were prepared by condensing 2-hydroxy-4-methoxyacetophenone (2-H-4-MAc) with urea and formaldehyde in the presence of 2 M HCI/2M H2SO * catalyst with varying molar ratios of reacting monomers. The resin samples were characterized by elemental analyses and IR spectral studies. /~ was determined by vapour pressure osmometry and non-aqueous conductometric titralion in pyridine. Viscosity measurements of ~he resin samples were carried ou~ in dimethylformamide. Chela~ion ion-exchange properties of 1 : 1 resin for selected metal ions have also been studied employing the batchequilibration method. This method involved the measurement of distribution of a given metal between a resin sample and a solution containing metal ions. The study was carried out over a wide pH range and in media of differing ionic strengths.