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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.
    Type of Medium: Electronic Resource
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