# Synthetic, spectroscopic, and structural Studies on Lanthanide Complexes of Diphosphazane Dioxide Ligands

Aparna, Kasani and Krishnamurthy, Setharampattu S and Nethaji, Munirathinam (1995) Synthetic, spectroscopic, and structural Studies on Lanthanide Complexes of Diphosphazane Dioxide Ligands. In: Zeitschrift for anorganische und allgemeine Chemie, 621 (11). pp. 1913-1921.

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## Abstract

Lanthanide nitrate complexes of diphosphazane dioxides $Ph_2P(O)N(Pr^i)P(O)Ph_2 (1)$ and $(PhO)_2P(O)N(Me)P(O)(OPh)_2$ (2) have been synthesised 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 by starting from phosph(V)azane chloro precursor. The structure of 2 is confirmed by X-ray diffraction. Crystallographic data for 2: Triclinic, Space group P1 , a = 10.078(1), b = 10.575(3), c = 12.364(4) A, \alpha = 75.70(2)A°, \alpha = 75.56(1)A°, \gamma = 77.68(1)A°, Z = 2, V = 1 220 A 3; structure refined to RF = 0.0459 on 3 495 data with F > 3 (F). The diphosphazane dioxide ligand exhibits trans geometry in the solid state. The structure of a lanthanide complex, $[Pr(NO_3)_3(2)_2]$ (14) is also determined by X-ray diffraction. Crystallographic data for 14: Trigonal, Space group P32, a = b = 15.710(2), c = 40.067(2) A, Z = 6, V = 8 564 A 3; structure refined to $R_F$ = 0.0430 on 8 077 data with F > 5 (F). The two diphosphazane dioxide ligands and the nitrate groups are coordinated to praseodymium in a bidentate chelate fashion. The geometry around the ten coordinated metal is distorted bicapped square antiprism.

Item Type: Journal Article The copyright belongs to Verlag GmbH & Co. KGaA, Weinheim. lanthanide complexes;diphosphazane dioxides;variable temperature nmr;crystal structure Division of Chemical Sciences > Inorganic & Physical Chemistry 28 Sep 2005 27 Aug 2008 11:29 http://eprints.iisc.ernet.in/id/eprint/3735