Na2Sr3As4 has been synthesized from Na3As, SrAs and As in a niobium ampoule at 1123 K and structurally characterized by single crystal X-ray crystallography (space group Pnma (No. 62); a = 751.4(2); b = 1564.2(3); c = 823.0(3) pm; Z = 8). It is a Zintl compound containing Sr2+ and Na+ cations and [As2]4- dumbbell anions with d(As-As) being 251.1(3) and 256.3(3) pm respectively.

Kanamaluru Vidyasagar

Department Of Chemistry

Arsenic

Characterization

Crystal Structure

diffractometers

Single crystals

Strontium compounds

Synthesis (chemical)

X ray crystallography

DISODIUM TRISTRONTIUM TETRAARSENIDE

DUMBBELL ANION

Homogeneity

NIOBIUM AMPOULE

PRICTIDE

STOE DIFFRACTOMETER

ZINTL COMPOUND

Sodium compounds

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IIT Madras

Synthesis and structure of the Zintl compound Na2Sr3As4

Journal of Alloys and Compounds

The novel compounds Sr13NbAs11 and Eu13NbAs11 have been synthesized from SrAs, Eu5As4, Sr, Nb and As in niobium ampoules at 1173-1273 K. The tetragonal tI 200 phases are defect variants of the Ca14AlSb11 structure (space group I41/acd (no. 142); Sr13□NbAs11: a = 1649.8(2) and c = 2214.1(3); Eu13□NbAs11: a = 1632.9(8) and c = 2197.3(8) pm; Z = 8). The structures are built from the cations Sr2+, and Eu2+, respectively, and from the anions [NbAs4]7-, As3-, and the linear polyanion [As3]7-. This polyanion (isosteric to I3-) is asymmetric with d(As-As) = 273.0 and 346.0pm (Sr) and 274.7 and 335.6pm (Eu), respectively. The bond lengths in the tetrahedral anions are d(Nb-As) = 250.8 and 251.1 pm. The complete structural arrangement is related to that of Cu2O by forming two interpenetrating networks. The oxygen atoms are substituted by niobium centered As4 tetrahedra, and the Cu atoms are substituted by As6 octahedra (centered by Sr, Eu). The central As atoms of the polyanions connect the nets. Both As networks are enveloped by the remaining cations forming cubes, tetragonal antiprisms and capped trigonal prisms. © Johann Ambrosius Barth 1996.

Zeitschrift fur Anorganische und Allgemeine Chemie

Sr13□NbAs11 and Eu13□NbAs11 - Defect variants of the Ca14AlSb11 structure with asymmetric [As3]7- anions

Direct Methods for Solving Macromolecular Structures

SHELX Applications to Macromolecules

Journal of Solid State Chemistry

On the structure and some properties of novel ternary pnictides: Na2M3Y4 (M = Sr, Eu; Y = P, As)

Chemical Reviews

Chemistry and structural chemistry of phosphides and polyphosphides. 48. Bridging chasms with polyphosphides

Angewandte Chemie International Edition in English

Graphical Abstract(Angew. Chem. Int. Ed. Engl. 11/1981)

Angewandte Chemie

X-Ray Analysis and the Structure of Organic Molecules. VonJ. D. Dunitz. Cornell University Press, Ithaca 1979. 528 S., geb. £ 33.00

Journal	Data powered by TypesetJournal of Alloys and Compounds
Publisher	Data powered by TypesetElsevier BV
ISSN	09258388
Open Access	No