Ionization and Complexing Properties of Hyperbranched Polyester Poly[3-(2-aminoethyl)amino)]propionate

Syntheses of a polydentate ligand based on the second-generation hyperbranched polyester containing 3-(2-aminoethyl)amino]propionate groups and its metal complex with copper(II) ions have been elaborated. In view of the IR, electronic absorption, and EPR spectroscopy data, it has been suggested that the coordination sites in the metal-polymer complex are paramagnetic sites with the CuN4Solv2 or CuN2O2Solv2 composition (Solv = H2O, DMSO).     

Cobalt(II) complexation with immobilized proteinases of Candida albicans

Complexation of cobalt(II) ion with proteolytic enzymes of Candida albicans (SAP C.alb.) of induced (ISAP C.alb.) and constitutive (CSAP C.alb.) types immobilized on the cellulose nitrate membrane surface has been studied. The maximal sorption capacity of cellulose nitrate membranes with covalently immobilized induced proteinase ISAP C.alb. with respect to Co(II) ions is 16.5 ??mol/cm², and that for CSAP C.alb. is 27.7 ??mol/cm². The model of fixed polydentate centers has been used for describing complex formation. The complexation constants (?? _n ) and the average number of immobilized ligands coordinated to one metal atom (n) have been determined. The specificity of binding of immobilized enzyme molecules to Co(II) ion has been assessed.     

Adsorption recovery and preconcentration of Ni(II), Zn(II), and Cd(II) on nitrocellulose membranes modified with <Emphasis Type="Italic">N</Emphasis>-acylamidophosphates

N-(Thio)phosphorylated (thio)carbamides and (thi o)amides are proposed as modifiers of polymer nitrocellulose membranes for the adsorption preconcentration of Ni(II), Zn(II), and Cd(II) from aqueous solutions. The binding constants of metalions with the immobilized reagents are 1.5–2.5 times higher than those with monomer ligands in solution. The preconcentration coefficients are 1950–3500. Aprocedure was developed for the adsorption preconcentration and recovery of Ni(II), Zn(II), and Cd(II) as complex compounds, using nitrocellulose membranes modified with N-(thio)phosphorylated thiocarbamides and thioamides.