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  • 1
    ISSN: 0044-2313
    Keywords: Lanthanide complexes ; diphosphazane dioxides ; variable temperature NMR ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesen und spektroskopische sowie strukturelle Untersuchungen an Lanthanid-Komplexen mit Diphosphazandioxid-LigandenLanthanidnitrat-Komplexe mit den Diphosphazandioxiden Ph2P(O)N(Pri)P(O)Ph2 (1) und (PhO)2P(O)N(Me)P(O)(OPh)2 (2) wurden dargestellt und mit verschiedenen Methoden untersucht. Ligand (2) kann nach zwei verschiedenen Methoden erhalten werden, nämlich durch Oxidation des Phosph(III)azan-Liganden oder ausgehend von der Phosph(V)azanchloro-Vorstufe. Die Struktur von 2 wird durch die Röntgenanalyse bestätigt: triklin, Raumgruppe P1, a = 10,078(1), b = 10,575(3), c = 12,364(4) Å, α = 75,70(2)°, β = 75,56(1)°, γ = 77,68(1)°, Z = 2, V = 1 220 Å3; verfeinert bis zu RF = 0,0459 an 3 495 Reflexen mit F 〉 3σ(F). Die Phosphazandioxid-Liganden zeigen im festem Zustand trans-Geometrie. Die Struktur des Lanthanid-Komplexes [Pr(NO3)3(2)2] (14) wurde ebenfalls röntgenographisch bestimmt: trigonal, Raumgruppe P32, a = b = 15,710(2), c = 40,067(2) Å, Z = 6, V = 8 564 Å3; verfeinert bis zu RF = 0,0430 an 8 077 Reflexen mit F 〉 5σ(F). Die zwei Diphosphazandioxid-Liganden und die Nitrat-Gruppen sind in Art eines zweizähnigen Chelats an Praseodym koordiniert. Die Geometrie am zehnfach koordinierten Metall ist ein verzerrtes, zweifach bekapptes quadratisches Antiprisma.
    Notes: Lanthanide nitrate complexes of diphosphazane dioxides Ph2P(O)N(Pri)P(O)Ph2 (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) Å, α = 75.70(2)°, α = 75.56(1)°, γ = 77.68(1)°, Z = 2, V = 1 220 Å3; structure refined to RF = 0.0459 on 3 495 data with F 〉 3σ(F). The diphosphazane dioxide ligand exhibits trans geometry in the solid state. The structure of a lanthanide complex, [Pr(NO3)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) Å, Z = 6, V = 8 564 Å3; structure refined to RF = 0.0430 on 8 077 data with F 〉 5σ(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.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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