Pingrong Wei, De-Dong Wu, T. Mak
Dec 1, 1995
Citations
0
Influential Citations
5
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract A new betaine compound, ( N -carboxymethyl)dimethylammonioacetate, Me 2 N(CH 2 CO 2 H)CH 2 CO 2 1 (space group C 2/ c with a = 5.748(2); b = 11.454(3) c = 11.515(4) A, β = 90.29(2)°, Z = 4 and R = 0.041) and its hydrochloride Me 2 N(CH 2 Co 2 H)CH 2 CO 2 ·HCl 2 (space group P 2 1 / c with a = 6.810(2), b = 10.392(3), c = 13.058(4) A, β = 95.39(3)°, Z = 4 and R = 0.033) have been synthesized and characterized by X-ray crystallography. In compound 1 adjacent [Me 2 N(CH 2 CO 2 ) 2 ] − moieties residing on sites of symmetry 2 are bridged by an acidic proton to form a very strong symmetrical O···H···O hydrogen bond of length 2.453(3) A, thus giving rise to a polymeric zigzag chain in the direction of the c axis. Likewise in compound 2 the carboxyl groups of two adjacent [Me 2 N(CH 2 Co 2 H) 2 ] + molecules are bridged by a chloride anion to form a (O H···Cl···H O) hydrogen bond, yielding a zigzag chain running parallel to the b axis.