Xiao‐Ming Chen, T. Mak
May 31, 1991
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0
Influential Citations
18
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract A new betaine derivative, 2-carboxy- N,N,N -trimethylethanaminium bromide monohydrate, (Me 3 NCH 2 CH 2 COOH)Br·H 2 O, I , has been synthesized and characterized by X-ray crystallography. Compound I crystallizes in space group Pnma (no. 62), with a =10.452(2), b =6.855(2), c =13.737(2)A, and Z =4. The structure ( R F =0.047 for 881 observed (⋎ F O ⋎&>;6⋎ F O ⋎) Mo K α data) features a hydrogen-bonded (BR − ·H 2 O) ∞ zigzag chain running parallel to the a axis. The quaternary ammonium ions, each attaining C s molecular symmetry, are laterally attached by donor hydrogen bonds to the exposed water molecules of the zigzag chain. The crystal structure consists of layers each having a zipper-like arrangement of the quaternary ammonium “side-chains”.