Petra Bombicz, Nikoletta B. Báthori, Alajos Kálmán
Struct. Chem., 26, 1611-1619, 2015
Abstract
2,4,6-triaryloxy-1,3,5-triazines (POT) form in general molecular diads, termed as Piedfort Units (PU), in
their crystals and their clathrates. Their bulky phenyl substituents (R = Me, F, Cl, Br, I, CN) in ortho, meta or
para position substantially hinder internal rotations. Instead, non-crystallographic rotations (ncr) or translations
(nct) are the bridges between the semirigid homologues or analogues, occasionally polymorphs. They occur in the
space groups R3c (161), R3 (148), P3c1 (165), P63/m (176), P31c (163), P21/c (14), Ia (9), and P1 (2). In each
group, the molecules are close to be isometrical, while these groups are linked by non-crystallographic symmetries
termed morphotropism. The observed non-crystallographic symmetries are virtual between the homologues and real
between their dimorphs. Real ncr’s were also found between 4-RPOTs and their clathrate forms. It is demonstrated
how e.g. toluene induces real nrc’s in its clathrate with 4-IPOT.