Abstract
Three acetonitrile solvates of tetramethoxycalix[4]arenes equally substituted on opposite methylene bridges are described with respect to their conformation and packing behaviour. All of the host molecules adopt a 1,2-alternate conformation, their packing architecture seems to be affected by the spatial demand of the bridge substituents only. This results in the synthetically implemented fine-tuning of the molecular arrangement. The engineering of the relevant packing motif, the “synthon” may be discussed most appropriate by the term “synthon engineering” following the expression of crystal engineering.
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