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  • 1
    Electronic Resource
    Electronic Resource
    Cs2B2S4 - Ein Salz der dimeren MetathioborsäureProfessor Peter Paetzold zum 60. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1330-1337 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19956210810
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  • 2
    Electronic Resource
    Electronic Resource
    Li3BS3 und LiSrBS3: Neue Orthothioborate mit trigonal-planar koordiniertem BorProfessor Wolfgang Jeitschko zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1508-1514 
    Details
    ISSN: 0044-2313
    Keywords: Orthothioborates ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li3BS3 and LiSrBS3: New Orthothioborates with Trigonal Planar Boron CoordinationWe report on the two new orthothioborates Li3BS3 (Pnma; a = 8.144(1) Å, b = 10.063(2) Å, 6.161(1) Å; Z = 4) and LiSrBS3 (Pnma; a = 7.557(1) Å, b = 9.083(2) Å, c = 7.049(1) Å: Z = 4). The two new phases were prepared by reaction of the metal sulfides, amorphous boron, and sulfur at 700°C. Both compounds contain isolated, planar [BS3]3--anions. The lithium ions have fourfold (Li3BS3) and sixfold (LiSrBS3) sulfur coordination, the strontium ion shows an eightfold sulfur coordination. The two compounds represent new A3BX3 resp. AA′BX3 structure types.
    Notes: Es wird über die beiden Orthothioborate Li3BS3 (Pnma; a = 8,144(1) Å, b = 10,063(2) Å, 6,161(1) Å; Z = 4) und LiSrBS3 (Pnma; a = 7,557(1) Å, b = 9,083(2) Å, c = 7,049(1) Å; Z = 4) berichtet. Die beiden neuen Phasen wurden durch Hochtemperatur-Schmelzreaktion aus den Metallsulfiden, amorphem Bor und Schwefel bei 700°C dargestellt. Beide Verbindungen enthalten isolierte, planare [BS3]3--Anionen. Die Lithiumionen sind vierfach (Li3BS3) bzw. sechsfach (LiSrBS3) von Schwefel umgeben, das Strontiumion weist eine achtfache Schwefelkoordination auf. Li3BS3 und LiSrBS3 bilden neue A3BX3 bzw. AA′BX3-Strukturtypen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220912
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    Paper (German National Licenses)
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