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  • 1
    ISSN: 0044-2313
    Keywords: Vanadium(IV) complexes ; syntheses ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions and Thermal Behaviour of Nonoxo Vanadium(IV) Complexes. Crystal Structures of Methoxo-oxo[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and Methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V)The persistence of non-oxo vanadium(IV) complexes in dichlormethane/methanol/water solutions was studied by UV/VIS spectroscopy. The reaction products methoxo-oxo-[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V) were isolated and characterized by X-ray analysis. The thermal behaviour of non-oxo vanadium(IV) complexes was checked.
    Notes: Die Beständigkeit oxofreier Vanadium(IV)-Komplexe mit dreizähnigen diaciden Liganden in Dichlormethan/Methanol/Wasser wurde UV/VIS-spektroskopisch untersucht. Als Reaktionsprodukte wurden Methoxo-oxo-[thenoyl-trifluoraceton-salicylhydrazonato(2-)]vanadium(V) sowie Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) isoliert und röntgenstrukturanalytisch charakterisiert. Das thermische Verhalten der oxofreien Vanadium(IV)-Komplexe wurde analysiert.Methoxo-oxo-[thenoyltrifluoraceton-salicylhydrazonato(2-)]-vanadium(V), Raumgruppe P21/a2, Z = 4, 3 124 beobachtete unabhängige Reflexe, R = 0,0579, Gitterabmessungen bei 25°C; a = 800,0(2) pm, b = 2 027,3(6) pm, c = 1 165,0(3) pm, β = 109,03(2)° Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) Raumgruppe P21/c, Z = 4, 2 312 beobachtete unabhängige Reflexe, R = 0,031, Gitterabmessungen bei 25°C: a = 1 122,6(1) pm, b = 772,96(9) pm, c = 2 021,2(4) pm, β = 95,32(1)°.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Dioxomolybdenum(VI) complexes ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ligand Exchange Reactions of Bis(acetylacetonato)dioxo-molybdenum(VI). Crystal Structures of [Salicylaldehyde-benzoylhydrazonato(2-)]dioxo-methanol-molybdenum(VI) and [Benzoylacetone-benzoylhydrazonato(2-)]dioxo-triphenylphosphaneoxide-molybdenum(VI)The products of ligand exchange reactions between bis(acetylacetonato)dioxo-molybdenum(VI) and tridentate diacidic ligands H2L in the presence of triphenylphosphane were found by mass spectrometry to be complexes of the type MoO2L. In the case of salicylaldehyde 2-hydroxyanil MoL2 could also be identified. The compounds MoO2L were crystallized as complexes with methanol or triphenylphosphane oxide.Crystallographic data see “Inhaltsübersicht”.
    Notes: Als Reaktionsprodukte bei der Ligandenaustauschreaktion von Bis(acetylacetonato)dioxo-molybdän(VI) mit dreizähnigen diaciden Liganden H2L in Gegenwart von Triphenylphosphan wurden massenspektrometrisch Komplexe des Typs MoO2L identifiziert. Beim Salicylaldehyd-2-hydroxyanil konnte auch MoL2 nachgewiesen werden. Die Verbindungen MoO2L kristallisieren als Komplexe mit Methanol oder Triphenylphosphanoxid.[Salicylaldehyd-benzoylhydrazonato-(2-)]dioxo-methanol-molybdän(VI): Raumgruppe P1, Z = 2, 3 073 unabhängige Reflexe, R = 3,2%; Gitterabmessungen bei 19°C: a = 785,5(2) pm, b = 980,6(2) pm, c = 1 037,2(2) pm, α = 94,53(3)°, β = 107,38(3)°, γ = 90,35(3)°, [Benzoylaceton-benzoylhydrazonato(2-)]dioxo-triphenylphosphanoxid-molybdän(VI); Raumgruppe P21/n, Z = 4, 8 147 unabhängige Reflexe, R = 3,55% Gitterabmessungen bei 20°C: a = 1 091,3(2) pm, b = 1 512,8(3) pm, c = 1897,1(4) pm, β = 92,25(3)°.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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