FT-IR and UV/Vis spectroscopic analyses of liquid-liquid extraction of Cu(II), Nd(III) and Gd(III) by N,N'-Bis(dioctylphosphorylmethyl)-1,4-diaminobutane

The N,N'-Bis(dioctylphosphorylmethyl)-1,4-diaminobutane has been synthesized by Kabachnic-Fields reaction and characterized by routine X-ray, IR and NMR 1H, 31P and 13C spectroscopy. The process of liquid-liquid extraction of copper, neodymium and gadolinium by N,N'-Bis(dioctylphosphorylmethyl)-1,4-diaminobutane (L) in benzene was studied using FT-IR spectroscopy. The stability constant and stoichiometry of the L and Cu(II) were determined. Based on the data of IR and UV/Vis spectroscopy and EPR the structure of the complex is proposed.Single crystal X-ray diffraction analysis showed that crystal is formed by the centrosymmetric molecules of N,N'-Bis(dioctylphosphorylmethyl)-1,4-diaminobutane.