Publication Date

1980

Document Type

Dissertation/Thesis

First Advisor

Krause, Brigitte (Professor of physics)

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics

LCSH

Organogold compounds; Organobromine compounds; X-ray crystallography; Organonitrogen compounds

Abstract

X-ray diffraction data were used to determine the crystal structure of tetra-n-butylammonium tetrabromoaurate(III), C₁₆B₃₆AuBr₄N or [Bu₄N]⁺[AuBr₄]⁻. The compound crystallizes in a tetragonal lattice array with Laue symmetry 4/m. Lattice constants used in the structure refinement are a=12.142(2) Å and c=8.513(1) Å. Two formula units are contained in a unit cell of volume U=1255 ų ; the calculated and experimental densities are 2.01 and 2.03(2) gcm⁻³, respectively. The space group is believed to be P4̅, with atom parameters that are almost related by the higher symmetry of P4/n. Because of the large parameter correlation between atoms which are independent in P4̅ but nearly related by P4/n symmetry, the structure was refined in space group P4/n. The [AuBr₄]⁻ anions are square planar and lie in planes perpendicular to [001]; the Au-Br bond distance is 2.404(1) Å. The [Bu₄N]⁺ cations are disordered: they pack in two alternative 4 orientations, both having idealized point symmetry 4̅. Bond distances and angles in the cation are reported. The final R value was 0.092 for 1450 diffractometer reflections.

Comments

Includes bibliographical references.

Extent

vii, 97 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

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