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Crystal Structure of Trimethylammonium Tetrafluoroborate in Three Solid Phases

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Crystal Structure of Trimethylammonium Tetrafluoroborate in Three Solid Phases

Hiroyuki Ishida, Setsuo Kashino, and Ryuichi Ikeda

a

Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan

aDepartment of Chemistry, University of Tsukuba 305-8571, Japan

Reprint requests to Dr. H. I.; Fax: +81-86-251-8497; E-mail: ishidah@cc.okayama-u.ac.jp Z. Naturforsch. 55 a, 765–768 (2000); received June 28, 2000

The crystal structure of (CH3)3NHBF4was studied in three solid phases by X-ray diffraction techniques. The structures of the ionic plastic phase (Phase I) stable above 453 K and Phase II between 384 and 453 K are CsCl-type cubic (a = 5.772(4) ˚A) and tetragonal (a = 9.815(5) and c = 6.895(5) ˚A), respectively. The room temperature phase (Phase III) forms a monoclinic lattice (space group P21/m, a = 5.7017(8), b = 8.5724(9), c = 7.444(1) ˚A, and= 102.76(1)). BF4 ions in this phase were shown to be disordered in four orientations.

Key words: Crystal Structure; X-ray Diffraction; Ionic Plastic Phase; Disorder.

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