Solid-state structure of 2-hydrazino-N-dodecyl(tetradecyl)-N,N-dimethyl-2-oxoethanaminium bromide

The solid state structures of single-chain surfactants 2-hydrazino-N-dodecyl-N,N-dimethyl-2-oxoethanaminium bromide (1a) and the N-tetradecyl homologue (1b) were determined. Compound 1a crystallized in the centrosymmetric triclinic space group <P(1)over bar> (Z = 2) in a unit cell of dimensions a = 5.996 (1) Angstrom, b = 8.490 (2) Angstrom, c = 20.797 (4) Angstrom, alpha = 95.96 (3)degrees, beta = 94.83 (3)degrees, gamma = 99.11 (3)degrees, and V = 1034.2 (4) Angstrom(3). The crystal packing is characterized by an interdigitated bilayer structure featuring London forces among the alkyl chains and electrostatic interactions and hydrogen bonding within the polar head group region. The alkyl chains pack in the T parallel to mode, and the molecular and chain cross sections are 50.26 Angstrom(2) (S) and 20.65 Angstrom(2) (Sigma), respectively. The structural characteristics of 1b are analogous to those of 1a. (C) 1997 Elsevier Science Ireland Ltd.