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The trigonal symmetry of trimesic acid (1,3,5-benzenetricarboxylic acid) H3TMA is exploited in the generation of honeycomb grid solids that eschew interpenetration. The structures of N,N-dicyclohexylammonium3TMA· xMeOH and N,N-dimethylammonium12H3TMA · H2TMA−3 · HTMA2−3·TMA3− reveal, relative to H3TMA, expanded and contracted honeycomb grids having internal cavities with effective diameters of 12.7 and 10.4 Å, respectively.
Meléndez et al. (Fri,) studied this question.
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