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  • Alkalimetallverbindungen  (1)
  • Tetrabariumtriphosphide, Ba4P3  (1)
  • Tetrapnictidotitanates(IV)  (1)
  • 1
    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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1763-1768 
    ISSN: 0044-2313
    Keywords: Tetrapnictidotitanates(IV) ; Na6ZnO4 structure type ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Tetrapnictidotitanates(IV): Na3M3[TiX4] with M = Na/Sr, Na/Eu and X = P, AsThe four novel tetrapnictidotitanates(IV) Na4Sr2TiP4, Na4Sr2TiAs4, Na4.3Eu1.7TiP4 and Na4.3Eu1.7TiAs4 were prepared from the binary pnictides NaX, M3X, M′X (X = P, As and M′ = Sr, Eu) and elementary titanium in tantalum ampoules. The air and moisture sensitive transition metal compounds form dark red hexagonal crystals. They are semiconductors with Eg = 1.8eV (Sr) and Eg = 1.3eV (Eu), respectively. The compounds are isotypic with Na6ZnO4 (space group P63mc (no. 186); hP22; Z = 2; Na4Sr2TiP4; a = 936.8(1) pm, c = 740.5(1) pm; Na4Sr2TiAs4: a = 958.2(1) pm, c = 757.1(1) pm; Na4.3Eu1.7TiP4: a = 929.9(2) pm, c = 732.0(2) pm; Na4.3Eu1.7TiAs4: a = 953.9(1) pm, c = 749.5(1) pm). Main structural units are polar oriented [TiP4]8- and [TiAs4]8- tetrahedral anions with d(Ti—P) = 240.2(3) pm and d(Ti—As) = 248.6(3) pm.
    Notes: Die vier neuen Tetrapnictidotitanate(IV) Na4Sr2TiP4, Na4Sr2TiAs4, Na4.3Eu1.7TiP4 und Na4.3Eu1.7TiAs4 wurden aus den binären Pnictiden NaX, M3X, M′X (X = P, As und M′ = Sr, Eu) und elementarem Titan in Tantalampullen dargestellt. Die luft- und hydrolyseempfindlichen Übergangsmetallverbindungen bilden dunkelrote, hexagonale Kristalle. Sie sind Halbleiter mit Eg = 1.8eV (Sr) bzw. Eg = 1.3eV (Eu). Alle Verbindungen sind isotyp zu Na6ZnO4 (Raumgruppe P63mc (Nr. 186), hP22, Z = 2; Na4Sr2TiP4: a = 936.8(1) pm, c = 740.5(1) pm; Na4Sr2TiAs4: a = 958.2(1) pm, c = 757.1(1) pm; Na4.3Eu1.7TiP4: a = 929.9(2) pm, c = 732.0(2) pm; Na4.3Eu1.7TiAs4: a = 953.9(1) pm, c = 749.5(1) pm). Wesentliche Baueinheiten sind polar ausgerichtete [TiP4]8-- und [TiAs4]8- Tetraederanionen mit d(Ti—P) = 240.2(3) pm und d(Ti—As) = 248.6(3) pm.
    Additional Material: 4 Ill.
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  • 3
    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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