Lr. Macgillivray et al., ONE-DIMENSIONAL HYDROGEN-BONDED POLYMERS BASED ON C-METHYL-CALIX[4]RESORCINARENE AND A CRYSTAL ENGINEERING DESIGN STRATEGY, Materials research bulletin, 1998, pp. 87-96
The X-ray crystal structures of co-crystals involving C-methylcalix[4]
resorcinarene 1 and exo-bidentate pyridines 2 are reported. The compon
ents assemble such that the calixarenes adopt a C-2v conformation and
the pyridines serve as bifunctional hydrogen bond accepters. In the ca
se of linear bridging units, 4,4'-bipyridine 2a and 4,4'-dipyridyl but
anedioate 2b, the assembly process yields 1D wave-like hydrogen bonded
polymers 4a and 4b, respectively, which include guest solvent molecul
es within 1. In the case of an angular bridging unit, pyrimidine 2c, t
he assembly process yields a 1D chain 5 which exhibits self-inclusion.
Thermal analysis of 4a demonstrates that the thermal behavior of thes
e compounds is independent of the nature of the included guest, the so
lvent-included lattices being stable up to 190 degrees C. (C) 1998 Els
evier Science Ltd.