646034-25-5Relevant articles and documents
Interaction of tantalum pentafluoride with imidotetraphenyldiphosphinic acid in noncoordinated solvents: Low-temperature cation-anion associates
Il'in,Kovalev,Schmidpeter
, p. 681 - 686 (2008/10/08)
An interaction of tantalum pentafluoride (I) with imidotetraphenyldiphosphinic acid (LH) at I : LH ratios from 2 to 0.5 has been studied using 19F and 31P NMR. During this interaction, one or two phosphoryl groups of the three donor sites of the LH ligand take part in complex formation. When I : LH = 2 : 1 mol/mol, the reaction produces the binuclear molecular complex (TaF5)2LH (II), where LH acts as a bridging ligand. The increasing ligand concentration in the solution provokes the deprotonation of the LH ligand coordinated in II with the formation of the [(TaF5)2L]- binuclear anion, LH 2+ cation, and chelate tetrafluoro complex TaF 4L. At LH excess binuclear anions are destroyed and mononuclear complex species [TaF5L]- and TaF3L2 appear in addition to TaF4L. In TaF3L2, which is a product of further substitution for fluorine atoms, the L- anions act as chelating ligands. At temperatures lower than 223 K, the binuclear anion and LH2+ cation are hydrogen-bonded to form ionic associates {[(TaF5)2L]-[LH2] +} and {[2(TaF5)2L]-[LH2] +]}.
