Growth-induced incommensurability observed in the organic co-crystal hexamethylenetetramine resorcinol

Abstract

Co-crystals of hexamethylenetetramine and resorcinol were investigated by X-ray diffraction. The structure was refined in the superspace group Xmcm(0β0)s0s, X = (1/2 1/2 0 1/2). In the average structure the resorcinol molecules are disordered between two orientations. The main effect of the modulation in the structure is a harmonic modulation of the occupation probabilities of the two orientations of the resorcinol molecule. However, the modulated order is not perfect and the resorcinol molecules remain partially disordered. Below 270 K the crystal undergoes a phase transition to a commensurately modulated structure with modulation vector q = (0 1/2 1/4) and superspace group X2/m(0 β γ)0s. The structure of the low-temperature phase could not be determined owing to the poor quality of the crystals affected by the reconstructive phase transition. © 2006 International Union of Crystallography Printed in Great Britain - all rights reserved.