K. Aparna et al., SYNTHETIC, SPECTROSCOPIC, AND STRUCTURAL STUDIES ON LANTHANIDE COMPLEXES OF DIPHOSPHAZANE DIOXIDE LIGANDS, Zeitschrift fur anorganische und allgemeine Chemie, 621(11), 1995, pp. 1913-1921
Citations number
24
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur anorganische und allgemeine Chemie
Lanthanide nitrate complexes of diphosphazane dioxides Ph(2)P(O)N(Pr-i
)P(O)Ph(2) (1) and (Pho)(2)P(O)N(Me)P(O)(OPh)(2) (2) have been synthes
ised and studied by conductometry, IR, multinuclear NMR spectroscopic
methods and X-ray diffraction. Ligand 2 is accessible by two different
methods, viz., by direct oxidation of the phosp(III)azane ligand or b
y starting from phosph(V)azane chloro precursor. The structure of 2 is
confirmed by X-ray diffraction. Crystallographic data for 2: Triclini
c, Space group P $($) over bar$$ 1, a = 10.078(1), b = 10.575(3), c =
12.364(4) Angstrom, alpha = 75.70(2)degrees, beta = 75.56(1)degrees, g
amma = 77.68(1)degrees, Z = 2, V = 1220 Angstrom(3); structure refined
to R(F) = 0.0459 On 3495 data with F > 3 sigma(F). The diphosphazane
dioxide ligand exhibits trans geometry in the solid state. The structu
re of a lanthanide complex, [Pr(NO3)(3)(2)(2)] (14) is also determined
by X-ray diffraction. Crystallographic data for 14: Trigonal, Space g
roup P3(2), a = b = 15.710(2), c = 40.067(2) Angstrom, Z = 6, V = 8564
Angstrom(3); structure refined to R(F) = 0.0430 on 8077 data with F >
5 sigma(F). The two diphosphazane dioxide ligands and the nitrate gro
ups are coordinated to praseodymium in a bidentate chelate fashion. Th
e geometry around the ten coordinated metal is distorted bicapped squa
re antiprism.