Crystal structure of diethoxynitrobenzene-p-tert-butylcalix[4]arene centerdot 2(CH3)(2)C=O: evidence of intra- and intermolecular CH/pi interactionsforced by crystal packing

Diethoxynitrobenzene-p-tert-butylcalix[4]arene(.)2(CH3)(2)C=O crystallized in the monoclinic system, space group P2(1)/c, with cell dimensions a = 16. 1437 (2) Angstrom, b = 21.0292(2) Angstrom, c = 18.9685(3) Angstrom and bet a = 110.308(1)degrees. The asymmetric unit consists of a diethoxynitrobenze ne-p-tert-butylcalix[4]arene molecule and two solvated acetone molecules. B esides the usual CH/pi interaction between p-tert-butylcalix[4]arene pi cav ity and a solvated acetone, this structure shows the intra- and intermolecu lar CH/pi interactions among a nitrobenzene ring, ethylene bridge of the et hoxynitrobenzene side chain and a solvated acetone molecule.