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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thiohalo Compounds of Niobium and Tantalum: NbSCl3, TaSCl3, [NbSCl5]2-, [TaSCl5]2-, [NbSBr4]-. Crystal Structures of (PPh4)2[NbSCl5] · 2 CH2Cl2 and NEt4[NbCl6]NbSCl3 can be obtained from NbCl5 by reaction with H2S or bistrimethylsilyl sulfide in a suspension of CCl4 or CH2Cl2, respectively; in the latter case the product contains a rest of trimethylsilyl groups. This also applies for TaSCl3, NbSBr3 and TaSBr3, which are formed from the metal pentahalides and S(SiMe3)2. NEt4[NbSCl4] is formed together with NEt4[NbCl6] in the reaction of NbCl5 with NEt4SH in CH2Cl2. PPh4[NbCl6] reacts with S(SiMe3)2 in dichloromethane yielding (PPh4)2[NbSCl5] · 2 CH2Cl2, whereas PPh4[NbSBr4] is obtained from PPh4[NbBr6] and S(SiMe3) under the same conditions.(PPh4)2[TaSCl5] · 2 CH2Cl2 was obtained from TaSCl3 and PPh4Cl in CH2Cl2. According to an X-ray crystal structure determination (PPh4)2[NbSCl5] · 2 CH2Cl2 crystallizes in the β-(AsPh4)2[UCl6] · 2 CH2Cl2 type with positionally disordered, octahedral anions. Crystal data: a = 1 021.7, b = 1120.4, c = 1 243.3 pm, α = 70.77, β = 80.24, γ = 80.54°, space group P1, Z = 2; 2462 unique observed reflexions, R = 0.036. NEt4[NbCl6] crystallizes isotypic to NEt4[WCl6], a = 723.5, b = 1 018.0, c = 1 174.6 pm, β = 100.07°, space group P21/n, Z = 2; 1 875 reflexions, R = 0.075.
    Notes: NbSCl3 kann aus einer Suspension von NbCl5 in CCl4 bzw. CH2Cl2 durch Reaktion mit H2S oder Bistrimethylsilylsulfid erhalten werden; im letzteren Fall enthält das Produkt noch Reste von Trimethylsilylgruppen. Dies gilt auch für TaSCl3, NbSBr3 und TaSBr3, die analog aus den Metallpentahalogeniden und S(SiMe3)2 entstehen. NEt4[NbSCl4] ist zusammen mit NEt4[NbCl6] aus NbCl5 und NEt4SH zugänglich. PPh4[NbCl6] reagiert mit S(SiMe3)2 in Dichlormethan zu (PPh4)2[NbSCl5] · 2 CH2Cl2, während aus PPh4[NbBr6] unter den gleichen Bedingungen PPh4[NbSBr4] entsteht.(PPh4)2[TaSCl5] · 2 CH2Cl2 wurde aus TaSCl3 und PPh4Cl in CH2Cl2 erhalten. Nach der röntgenographischen Kristallstrukturbestimmung kristallisiert (PPh4)2[NbSCl5] · 2 CH2Cl2 im β-(AsPh4)[UCl6] · 2 CH2Cl2-Typ mit fehlgeordneten, oktaedrischen Anionen. Kristalldaten: a = 1 021,7, b = 1 120,4, c = 1 243,3 pm, α = 70,77, β = 80,24, γ = 80,54°, Raumgruppe P1, Z = 2; 2 462 unabhängige beobachtete Reflexe, R = 3,6%. NEt4[NbCl6] kristallisiert isotyp zu NEt4[WCl6]: a = 723,5, b = 1 018,0, c = 1 174,6 pm, β = 100,07°, Raumgruppe P21/n, Z = 2; 1 875 Reflexe, R = 7,5%.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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