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- W2001473062 abstract "For the first time perthioborates with trigonal planar coordination of boron were prepared. Na2B2S5 (Pnma, a = 12.545(2) Å, b = 7.441(1) Å, c = 8.271(1) Å, Z = 4) and Li2B2S5 (Cmcm, a = 15.864(1) Å, b = 6.433(1) Å, c = 6.862(1) Å, Z = 4) were obtained by reaction of the metal sulfides with stoichiometric amounts of boron and an excess of sulfur (effective molar ratio M:B:S = 1:1:4) at 600°C (650°C) and subsequent annealing. The non-isotypic structures contain exactly planar [B2S5]2− groups consisting of five-membered B2S3 rings with one additional exocyclic sulfur on each of the boron atoms. The alkaline metal cations are four-coordinate (lithium) and (four + four)-coordinate (sodium) respectively. Na2B2S5 und Li2B2S5: Zwei neue Perthioborate mit planaren 1,2,4-Trithia-3,5-Diborolan-Ringen Na2B2S5 (Pnma, a = 12,545(2) Å, b = 7,441(1) Å, c = 8,271(1) Å, Z = 4) und Li2B2S5 (Cmcm, a = 15,864(1) Å, b = 6,433(1) Å, c = 6,862(1) Å, Z = 4) konnten durch Reaktion der Metallsulfide mit amorphem Bor und elementarem Schwefel im Atomverhältnis 1:1:4 bei einer Reaktionstemperatur von 600°C (650°C) dargestellt werden. Die Kristallstrukturen bestehen aus planaren, isolierten [B2S5]2−-Fünfringen, zwischen denen sich die (vier)- (Lithium) bzw. (vier + vier)-fach (Natrium) koordinierten Kationen befinden." @default.
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- W2001473062 date "1995-08-01" @default.
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- W2001473062 title "Na2B2S5 and Li2B2S5: Two Novel Perthioborates with Planar 1,2,4-Trithia-3,5-Diborolane Rings" @default.
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- W2001473062 doi "https://doi.org/10.1002/zaac.19956210809" @default.
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