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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 109-116 
    ISSN: 0044-2313
    Keywords: Perthioborates, RbBS3, TlBS3, Tl3B3S10 ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Perthioborates RbBS3, TIBS3, and Tl3B3S10.RbBS3 (P21/c, a=7.082(2) Å, b=11.863(4) Å, c=5.794(2) Å, β=106.54(2)°) was prepared as colourless, plate-shaped crystals by reaction of stoichiometric amounts of rubidium sulfide, boron, and sulfur at 600°C and subsequent annealing. TlBS3 (P21/c, a=6.874(3) Å, b=11.739(3) Å, c=5.775(2) Å, β=113.08(2)°) which is isotypic with RbBS3 was synthesized from a sample of the composition Tl2S · 2 B2S3. The glassy product which was obtained after 7 h at 850°C was annealed in a two zone furnace for 400 h at 400→350°C. Yellow crystals of TlBS3 formed at the warmer side of the furnace.Tl3B3S10 (P1, a=6.828(2) Å, b=7.713(2) Å, c=13.769(5) Å, α=104.32(2)°, β=94.03(3)°, γ=94.69(2)°) was prepared as yellow plates from stoichiometric amounts of thallium sulfide, boron, and sulfur at 850°C and subsequent annealing.All compounds contain tetrahedrally coordinated boron. The crystal structures consist of polymeric anion chains. In the case of RbBS3 and TlBS3 nonplanar five-membered B2S3 rings are spirocyclically connected via the boron atoms. To obtain the anionic structure of Tl3B3S10 every third B2S3 ring of the polymeric chains of MBS3 is to be substituted by a six-membered B(S2)2B ring.
    Notes: Farblose, plättchenförmige Kristalle von RbBS3 (P21/c, a=7,082(2) Å, b=11,863(4) Å, c=5,794(2) Å, β=106,54(2)°) entstehen aus einem stöchiometrischen Ansatz von Rubidiumsulfid, Bor und Schwefel bei 600°C und anschließendem Tempern. Die zu RbBS3 isotype Phase TlBS3 (P21/c, a=6,874(3) Å, b=11,739(3) Å, c=5,775(2) Å, β=113,08(2)°) erhält man aus dem Ansatz Tl2S · 2 B2S3. Das nach 7 h bei 850°C erhaltene glasige Produkt wird in einem Zweizonenofen 400 h bei 400→350°C ausgelagert. Gelbe Kristalle der Verbindung bilden sich in der wärmeren Ofenzone. Das ebenfalls gelbe Tl3B3S10 (P1, a=6,828(2) Å, b=7,713(2) Å, c=13,769(5) Å, α=104,32(2)°, β=94,03(3)β, γ=94,69(2)°) bildet sich aus stöchiometrischen Mengen von Thalliumsulfid, Bor und Schwefel bei 850°C und anschließendem Tempern.Die ausschließlich tetraedrisch koordiniertes Bor enthaltenden Verbindungen bilden polymere Kettenstrukturen, die sich im Fall des RbBS3 und TlBS3 aus spirocyclisch über die Boratome verknüpften, nichtplanaren Trithiadiborolan-Ringen aufbauen. Ersetzt man in diesen Anionenketten jeden dritten B2S3-Fünfring durch einen B(S2)2B-Sechsring, so erhält man die Anionenstruktur des Tl3B3S10.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1330-1337 
    ISSN: 0044-2313
    Keywords: Thioborates ; syntheses ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs2B2S4 - A Derivative of the Dimeric Metathioboric AcidCs2B2S4 (structure: I41/acd; a = 7.270(1) Å, c = 35.737(7) Å; Z = 8; substructure: I4/mmm; a′ = 5.141(1) Å, c′ = 17.868(4) Å, Z = 2) is prepared by the reaction of cesium sulfide with stoichiometric amounts of boron and sulfur (effective molar ratio M:B:S = 2:2:4) at 600°C and subsequent annealing. The crystal structure contains isolated [B2S4]2- groups consisting of four-membered B2S2 rings with two exocyclic sulfur atoms on each of the boron atoms. The cesium cations are nine-coordinate between these rings. The structural feature of two edge-sharing BS3 groups forming an isolated anion appears for the first time in thioborate chemistry, although it is known as a part of the polymeric network in B2S3.
    Notes: Cs2B2S4 (I41/acd; a = 7,270(1) Å, c = 35,737(7) Å; Z = 8; Subzelle: I4/mmm; a′ = 5,141(1) Å, c′ = 17,868(4) Å, Z = 2) wird durch Reaktion von Caesiumsulfid Cs2S mit amorphem Bor und elementarem Schwefel im Verhältnis 1:2:3 bei einer Reaktionstemperatur von 600°C mit anschließendem Tempern dargestellt. Die Kristallstruktur besteht aus molekularen, planaren [B2S4]2--Einheiten mit extrem gespannten [B2S2]-Vierringen, zwischen denen sich die neunfach koordinierten Alkalimetallkationen befinden. Das Strukturmotiv zweier kantenverknüpfter BS3-Gruppen wird hier erstmals in der Chemie der Thioborate isoliert beobachtet, ist jedoch als Baustein des polymeren Bor-Schwefel-Gerüsts im B2S3 bekannt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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