Home Die Oxochlorovanadate PPh4[VOCl3OH], PPh4[VOCl4], (PPh4 )2 [VOCl4 ]·2CH3CN und (PPh4)2[VOCl4]·CH3CN mit auffälligen Abweichungen von der quadratisch-pyramidalen Anionenstruktur / The Oxochlorovanadates PPh4[VOCl3OH], PPh4[VOCl4], (PPh4 )2 [VOCl4 ]·2CH3CN and (PPh4)2[VOCl4]·CH3CN with Remarkable Deviations from the Square-Pyramidal Anion Structure
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Die Oxochlorovanadate PPh4[VOCl3OH], PPh4[VOCl4], (PPh4 )2 [VOCl4 ]·2CH3CN und (PPh4)2[VOCl4]·CH3CN mit auffälligen Abweichungen von der quadratisch-pyramidalen Anionenstruktur / The Oxochlorovanadates PPh4[VOCl3OH], PPh4[VOCl4], (PPh4 )2 [VOCl4 ]·2CH3CN and (PPh4)2[VOCl4]·CH3CN with Remarkable Deviations from the Square-Pyramidal Anion Structure

  • Andrea Noll , Susanne Rabe and Ulrich Müller
Published/Copyright: June 2, 2014
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Starting from vanadium which was not free of oxide, VCl4 was prepared; its reaction with PPh4Cl in the presence of K2S5 in dichloromethane yielded PPh4[VOCl3OH]. From V2S5, PPh4Cl and S2Cl2 in acetonitrile, sulfur crystallized first, then PPh4[VOCl4], and then (PPh4)2[VOCl4]·4CH3CN. Upon standing with the mother liquor at -18°C, the latter was converted to (PPh4)2[VOCl4]·2CH3CN. According to its X-ray crystal structure determination, PPh4[VOCl3OH] (space group Pbca, a = 1105.5, b = 1920.8, c = 2242.8 pm, Z - 8) has nearly square-pyramidal anions that are associated to chains by 0-H⋯C1 bridges. PPh4[VOCl4] is isotypic with AsPh4[VOCl4] and has strictly square-pyramidal anions (space group P4/n, a = 1254.0, c = 765.0 pm, Z = 2). In (PPh2)2[VOCl4]·4CH3CN (space group P1̄, a = 1281.3, b = 1276.6, c = 1841.5 pm, α = 84.11°, β= 83.96, γ = 64.31°, Z = 2) the square pyramid of the VOCl42- ion is distorted towards a trigonal-bipyramidal shape (C2v symmetry) having trans-ClVCl angles of 145.88° and 156.87° and O=V-Cl angles of 107° and 101.6°. In (PPh4)2[VOCl4]·2CH3CN (space group P1, a = 1017.1, b = 1029.3, c = 2416.0, α = 77.74°, ß = 79.99°, γ = 78.94°, Z = 2), the VOCl42- structure is even closer to trigonal-bipyramidal, with trans-ClVCl angles of 133.25° and 165.80° and 0=V-Cl angles of 113.3° and 97°.

Received: 1998-11-23
Published Online: 2014-6-2
Published in Print: 1999-5-1

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