Abstract
The complexes formed in the extraction of divalent manganese and copper from hydrochloric acid solutions by di-(2-ethylhexyl)-phosphoric acid (DEHPA;HX) have been investigated by electron spin resonance (ESR) spectroscopy. On the basis of the results, the g-values and hyperfine splitting constants for the DEHPA-complexes are determined by computer simulation; manganese(II), g = 1.996 and |Aav| = 0.00718 cm−1; copper(II), g= 2.333, g⊥ = 2.076, |A| = 0.00786 cm−1 and |B| = 0.00078 cm−1. Spectrophotometry and magnetic studies show that the monomeric species Mn(X2H)2 and Cu(X2H)2, which are tetrahedral and square planar, respectively, are formed in the organic phase when DEHPA is present in excess. It is deduced for the copper complex that in-plane σ-bonding is appreciably covalent and that in-plane and out-of-plane π-bonding are ionic.
Published Version
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