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  • 1
    ISSN: 0044-2313
    Keywords: LiMg[BN2] ; Ba4[BN2]2O ; Nitridoborates ; Linear Anions [BN2]3- ; Crystal Structure ; Vibrational Spectrum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Nitridoborates. 1. LiMg[BN2] and Ba4[BN2]2O, Compounds with the Anion [N—B—N]3-: Syntheses, Crystal Structures, and Vibrational SpectraLiMg[BN2] and Ba4[BN2]2O were synthesized from stoichiometric mixtures of the binary components Li3N, Mg3N2, BN and BaO, Ba3N2. BN in sealed niobium ampoules at 1575 and 1350 K, respectively. The structures are characterized by isolated anions [N—B—N]3-, packed in different ways (LiMg[BN2]: I4/mmm (No. 139); a = 379.8 pm, c = 891.6 pm, c/a = 2.348; Z = 2; Ba4[BN2]2O; Cmca (No. 64); a = 1575.3 pm, b = 729.1 pm, c = 731.9 pm; Z = 4). The bond lengths and the bond angles are d(B—N) = 133.6 pm and β(N—B—N) = 180° in LiMg[BN2] and d(B—N) = 135 pm and β(N—B—N) = 173.4° in Ba4[BN2]2O, respectively.The vibrational spectra have been interpreted with respect to the D∞h symmetry of the isolated [N—B—N]3- anions, taking into account the slight symmetry reduction to C2v in Ba4[BN2]2O. The calculated valence force constants f(B—N) = 8.16 Ncm-1 and f(B—N) = 7.55 Ncm-1 are discussed and compared with those of other nitridoborates.
    Notes: LiMg[BN2] und Ba4[BN2]2O bilden sich aus stöchiometrischen Gemengen der binären Komponenten Li3N, Mg3N2, BN bzw. BaO, Ba3N2, BN in verschweißten Nb-Ampullen bei 1575 bzw. 1350 K. Die charakteristischen Bauelemente sind isolierte [N—B—N]3- -Anionen, die im Kristall unterschiedlich gepackt sind (LiMg[BN2]: I4/mmm (Nr. 139); a = 379.8 pm, c = 891.6pm, c/a = 2.348; Z = 2; Ba4[BN2]2O: Cmca (Nr.64); a = 1575.3 pm, b = 729.1pm, c = 731.9 pm; Z = 4). Die Bindungslängen und Bindungswinkel betragen d(B—N) = 133.6 pm und β(N—B—N) = 180° in LiMg[BN2] bzw. d(B—N) = 135 pm und β(N-B-N) = 173.4° in Ba4[BN2]2O.Die Schwingungsspektren der Verbindungen wurden auf der Basis der D∞h-Symmetrie der isolierten [N—B—N]3--Anionen unter Berücksichtigung der Symmetrieerniedrigung nach C2v in Ba4[BN2]2O interpretiert. Die aus den gemessenen Frequenzen berechneten Kraftkonstanten f(B—N) = 8.16 bzw. 7.55 Ncm-1 werden diskutiert und mit denen anderer Nitridoborate verglichen.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1081-1086 
    ISSN: 0044-2313
    Keywords: K2Mn[P2S6], Hexathiodiphosphate(IV) ; Hexathiohypodiphosphate ; Crystal Structure ; Vibrational Spectrum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kristallstruktur und Schwingungsspektrum von Dikaliummangan(II)-hexathiodiphosphat(IV), K2Mn[P2S6]K2Mn[P2S6] wurde aus den Elementen bei 1 173 K in evakuierten Quarzampullen dargestellt. Die Verbindung bildet transparente, hellbraune, luft- und feuchtigkeits-beständige Kristalle. Die Kristallstruktur von K2Mn[P2S6] (monoklin; Raumgruppe P21/n, No. 14; a = 6,1966(9), b = 12,133(2), c = 7,424(1) Å, β = 101,52(1)°; Z = 2; Pearson-Code mP22) enthält Säulen flächenverknüpfter S6-Polyeder (verzerrte Oktaeder und trigonale Antiprismen), die parallel zur a-Achse verlaufen und durch K+ (KZ 10; d(K—S) = 3,23-3,92 Å) miteinander verbunden sind. Die S6-Polyeder der Säulen werden alternierend durch Mn (in Oktaedern mit d̄(Mn—S) = 2,647 Å) bzw. P2-Paare (in trigonalen Antiprismen) zentriert, die zur a-Achse um 73,1° geneigt sind. Die Bindungslängen in den Hexathiodiphosphat(IV)-Anionen [P2S6]4- mit angenäherter 3 2/m-D3d-Symmetrie betragen d̄(P—P) = 2,211 und d̄(P—S) = 2,018 Å. K2Mn[P2S6] ist isotyp zu K2Fe[P2S6] und der zweite Vertreter dieses Strukturtyps. Die beobachteten Fundamentalschwingungen von K2Mn[P2S6] stehen im Einklang mit der Faktorgruppenanalyse und werden auf der Basis von [P2S6]4--Einheiten unter Berücksichtigung der Abweichung von der D3d-Symmetrie zugeordnet.
    Notes: K2Mn[P2S6] was synthesized from the elements in sealed quartz ampoules at 1 173 K. The compound forms transparent light brown crystals, stable against air and moisture. The crystal structure (monoclinic; space group P21/n, No. 14; a = 6.1966(9), b = 12.133(2), c = 7.424(1) Å, β = 101.52(1)°, Z = 2; Pearson code mP22) consists of columns of face-sharing S6 polyhedra (distorted octahedra and trigonal antiprisms) parallel to the a axis, interconnected by inserted K+ (CN 10; d(K—S) = 3.23-3.92 Å). The S6 polyhedra of the columns are centered alternately by Mn (in octahedra with d̄(Mn—S) = 2.647 Å) and P2 pairs (in trigonal antiprisms) which are inclined to the a axis by 73.1°. The bond lengths in the resulting hexathiodiphosphate(IV) anions, [P2S6]4-, with approximate 3 2/m-D3d symmetry, are d(P—P) = 2.211 Å and d(P—S) = 2.018 Å. K2Mn[P2S6] is isotypic to K2Fe[P2S6], being the second member of this structure type. The internal modes of the observed Raman and FIR/IR spectra of K2Mn[P2S6] are in accord with the factor group analysis, and the fundamentals are assigned on the basis of [P2S6]4- units, taking into account the deviation of the D3d symmetry.
    Additional Material: 5 Ill.
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