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Structure of new heterometallic complexes in hexane on modelling the recovery of ruthenium from radioactive solutions

The analysis of EXAFS and XANES spectra of aqueous solutions and hexane extracts shows the interaction between hydrated (or solvated by (Oct)3PO molecules) Cu2+ cations and the complex anion [Ru(NO2)4(NO)(OH)]2-. This interaction is accompanied by the increase of the interatomic distances Ru–O from 1.96 to 1.99 Å in the first coordination sphere of Ru atoms. The average interatomic Ru–Cu distances of the resulting heterometallic complexes have been estimated as 3.4 Å. The bond between Ru- and Cu- fragments of heterometallic complexes in their extracts with (Oct)3PO in hexane is most probably carried out via oxygen atoms of OH and NO fragments of NO2 group of complex anion.