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The monoesters of mono- (1a), di- (1b), tri- (1c) and tetra- (1d) ethylene glycol with 3,4,5-trisbenzoic acid (1), the polymethacrylates derived from them (2) and the complexes of both 1 and 2 with LiCF3SO3 and NaCF3SO3 self-assemble into cylindrical supra molecular architectures which exhibit a hexagonal columnar (Phih) mesophase.The generation of the Phih mesophase depends on the stabilization of this assembly by endo-recognition in the core of the cylinder (H-bonding and ionic interactions) and exo-recognition that occurs between the tapered groups and also between the cylinders (i.e., the hexagonal arrangement of the columns).The low molecular weight compounds 1 are able to complex more salt in the Phih mesophase and have larger increases in Phih-isotropic transition temperature (TPhih-i) per increase in salt concentration than the corresponding polymethacrylates 2 derived from them.Molecular modelling appears to indicate that positional and conformational restrictions imposed by both the tapered side groups and the polymer backbone are responsible for these results.Both the polymers and the low molar mass compounds have their TPhih-i shifted to lower temperatures and allow more LiCF3SO3 to be complexed with the increase in the number of oxyethylene segments present in the flexible spacer.A comparison of the difference in the effectiveness of the Li cation versus the Na cation in providing increased stabilization of the Phih mesophase does not show any significant differences between the two cations.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI