Physical and Chemical Properties, Composition and Thermal Stability of a Complex of Neodium(III) with Heparin

The complex formation of Nd(III) with heparin anions is studied by pH-metric titration at 37°C (supporting electrolyte 0.15 M NaCl). The formation constant (β) of the complex [NdHep]: log β(NdHep) = 4.28 ± 0.02) is calculated using the NewDALSFEK program. The complex [Nd(H 2 O) 3 Hep] n is isolated in a solid form. Its composition is determined by the results of an X-ray spectral electron probe analysis, thermogravimetry, differential scanning calorimetry, and IR spectroscopy.