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  • 1
    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.
    Type of Medium: Electronic Resource
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