Structures and properties of solvated and unsolvated isopropyl functionalised calixarenes
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The tetra-iso-propyl ethers of calixarene and p-t-butylcalixarene have been isolated in the cone conformation, and structurally characterized as chloroform solvates. Thermogravimetric analysis demonstrated that the parent iso-propylcalixarene solvate is significantly more stable than the p-t-butylcalixarene analogue, retaining the solvent up to a temperature of of 125 °C. It was found that the calixarene ether sublimes at atmospheric pressure, and solvent-free crystals appropriate for structure determination were produced at reduced pressure. The p-t-butylcalixarene ether was also isolated without solvent in the lattice, but in this case the calixarene was crystallized from acetone, as sublimation did not produce crystals of sufficient quality.
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