Study of the interaction between some lanthanide (III) salts and i-propyl-diphenyl-phosphinoxide (i-PDPPO)

The compounds were prepared using nitrates clorides, bromide and acetates of lanthanide (III) and the i-Prophyldiphenylphosphine oxide (i-PDPPO). The analytical results indicate the following chemical formulas: Ln(NO3)3.4L.3H2O (Ln-Sm, Ho); LaCl3.4L.3H2O; LnCl3.2L.xH2O (Ln= Nd, Sm and x=9 and 6); SmBr3.3L.3H2O; La(C2H3O2)3.5L.2H2O and Ho (C2H3O2)3.9L (L=i-PDPPO). Eletrolitic molar conductance measurements showed that: a) the nitrates are non-eletrolytes in acetonitrile as well as the NdCl3.2L.9H2O. b) SmCl3.2L.6H2O and SmBr3.3L.3H2O are both eletrolytes 1:1 in methanol. Condutometric titrations of Sm(III) bromide and cloride confirmed the analytical results. The vibrational studies at the infrared region showed that the interactions occured through the oxigen atom of the P=O group and confirmed the NO3- ion coordinating character. (author)