New Ligands: Poly(diphenylphosphorylmethyl)arenes

Abstract To find out the influence of structure factors on efficincy and selectivity of complexformation the oxides of aromatic tret. di-, tri- and tetraphosphines were synthesized. The molecules contain as conformationaly hard bridges between coordination centres (P[dbnd]O groups) - fragments of polymethylarenes (isomeric xylenes, mesythylene, durene, dimethylnafthalene, dibenzo-18-crown-6). These compounds were obtained by the Arbusov reaction of Ph2POEt with corresponding bromomethylarenes. Extraction and complexformation with transplutonium elements, europium, uranium, copper, cobalt were studied. It was found, that among investigated ligands the action selectivity is determined, mainly, by the mutual location of P[dbnd]O groups. A theoretical conformational analysis using the atom-atom potential function method was applied to the isolated ligands. To reveal conformers suitable for chelating the energy minimisation was carred out with the penalty function constraints keeping the P[dbnd]O…O[dbnd]P dist...