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  • 1
    ISSN: 0044-2313
    Keywords: Tetrabariumtriphosphide, Ba4P3 ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry and Structural Chemistry of Phosphides and Polyphosphides. 58. Tetrabariumtriphosphide, Ba4P3: Preparation and Crystal StructureBa4P3 is obtained from the elements in the molar ratio 4:3 or by reaction of Ba3P2 and Ba5P4 in the molar ratio 1:1 (steel ampoules with inner corundum crucibles; 1 490 K). The greyish black, easily hydrolysing compound crystallizes in a new structure type oP56. The structure shows two crystallographically independent dumbbells P24- (d(P—P) = 225 and 232 pm) and isolated ions P3- corresponding to (Ba2+)8(P24-)4(P3-)4. The partial structure of the Ba atoms forms a complex network of trigonal prisms with tetrahedral and square pyramidal holes, as well as polyhedra with 14 faces (CN 10) which are icosahedron derivatives. The P3- anions center trigonal prisms and the 14 face polyhedron. The P-atoms of the P24- dumbbells center neighboring trigonal prisms with common square faces. (Pbam (no. 55); a = 1 325.4(2) pm, b = 1 256.2(2) pm, c = 1 127.3 pm; Z = 8).
    Notes: Ba4P3 erhält man aus den Elementen im Molverhältnis 4:3 oder durch Umsetzung von Ba3P2 und Ba5P4 im Molverhältnis 1:1 (Korundinnentiegel; Stahlampullen; 1 490 K). Die grauschwarze, hydrolyseempfindliche Verbindung kristallisiert in einem neuen Strukturtyp oP56 mit zwei kristallographisch unabhängigen P24--Hanteln (d(P—P) = 225 und 232 pm und isolierten P3--Anionen entsprechend (Ba2+)8(P24-)(P3-)4. Die Partialstruktur der Ba-Atome bildet ein komplexes Netz trigonaler Prismen mit tetraedrischen und quadratisch-pyramidalen Lücken, sowie einem 14-Flächner (CN 10), der sich vom Ikosaeder ableitet. Die P3--Anionen zentrieren trigonale Prismen und den 14-Flächner, die Atome der P24--Hanteln jeweils benachbarte trigonale Prismen mit gemeinsamer Vierecksfläche. (Pbam (Nr. 55); a = 1 325,4(2) pm, b = 1 256,2(2) pm, c = 1 127,3(2) pm; Z = 8).
    Additional Material: 5 Ill.
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  • 2
    ISSN: 0044-8249
    Keywords: Alkalimetallverbindungen ; Antimonverbindungen ; Elektronenlokalisierung ; Zintl-Phasen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 319-324 
    ISSN: 0044-2313
    Keywords: Potassium dilithium arsenide ; heterotrialkalimetall arsenide ; pnictide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation, Crystal Structure, and Properties of KLi2AsThe novel arsenide KLi2As has been synthesized either from the elements or from mixtures of the binary components Li3As and K3As in sealed Nb ampoules at 823 K and 623 K, respectively. It crystallizes in the space group Pmmn (no. 59) with a = 445.8(9); b = 671.5(11); c = 627.0(12) pm and Z = 2 formula units. The metallic reflecting silvercoloured platelets hydrolize rapidly under wet air. The compound (Pearson code oP8) is isopuntal with BaLi2Si and an intermediate between the Li3N and the Na3As type of structure. Potassium is distorted tetrahedrally coordinated by four As atoms (d(K—As) = 355 and 367 pm), arsenic by four potassium and six lithium atoms (d(As—K) = 355-367 pm; d(As—Li) = 260-265 pm) in form of a sphenocorona. Lithium is threefold coordinated (distorted trigonal planar) by arsenic and this unit is enveloped by a monocapped trigonal prism build by three lithium and four potassium atoms.
    Notes: Das neuartige Arsenid KLi2As wurde aus den Elementen bzw. aus Mischungen der binären Komponenten Li3As und K3As in zugeschweißten Niobampullen bei 823 K bzw. 623 K dargestellt. Es kristallisiert in der Raumgruppe Pmmn (Nr. 59) mit a = 445.8(9); b = 671.5(11); c = 627.0(12) pm und Z = 2 Formeleinheiten. Die metallisch glänzenden silberfarbenen Plättchen hydrolysieren schnell an feuchter Luft. Die Verbindung (Pearson-Code oP8) ist isopuntal zu BaLi2Si und ein Zwischenglied zwischen der Li3N- und der Na3As-Struktur. Kalium ist verzerrt tetraedrisch von vier As-Atomen (d(K—As) = 355 und 367 pm), Arsen von vier Kalium- und sechs Lithiumatomen (d(As—K) = 355-367 pm; d(As—Li) = 260-265 pm) in Form eines Sphenocorona koordiniert. Lithium ist verzerrt trigonal-planar von Arsen koordiniert, umhüllt von einem einfach überdachten trigonalen Prisma aus drei Lithium und vier Kaliumatomen.
    Additional Material: 4 Ill.
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