Crystal (programming language)

Trigonal crystal system

Crystal structure

Computer science

Inorganic chemistry

Physics

Organic chemistry

Tetramethylammonium

Optics

Microstructure

Crystallography

Chemistry

Programming language

X-ray crystallography

Diffraction

Crystallinity

Crystal twinning

Zeitschrift für anorganische und allgemeine Chemie

Single crystal structures are presented for the IF 2 − , ClF 4 − , IF 4 − , TeF 7 − , and AsF 4 − fluoroanions. The 1,1,3,3,5,5 hexamethylpiperidinium (pip + ) ion was used as cation in order to obtain good crystallinity and to avoid twinning and disorder which are notorious with the tetramethylammonium ion. Precise structural data are obtained for the first time, and the ions have the expected geometries. The pip + has the further advantage that cation‐anion interactions are weak, which results in fairly ideal structures of the anions. Pip + BrF 2 − is too unstable to be obtained in single crystal form, and pip + BrOF 4 − as well as NO + BrOF 4 − show disordered anions and cations.

Preparation and Structures of Salts with the Anions of IF2−, ClF4− IF4−, TeF7−, and AsF4−