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p - tert -Butyl-calix[8]arene crystallizes with six molecules of  N -methyl-morpholine in a triclinic lattice, space group  P 1 with  a  = 12.142(3) Å,  b  = 16.596(4) Å,  c  = 17.211(2) Å,  α  = 83.72(2)°,  β  = 80.66(2)°,  γ  = 69.55(2)°,  Z  = 1. The formation of hydrogen bonds with two molecules of  N -methyl-morpholine, induces the calix[8]arene skeleton to adopt a chair-like conformation in which two 3/4-cone moieties are oriented above and below the mean molecular plane, respectively. The other four solvent molecules per unit cell simply fill the interstitial voids in a “like-tubular” solid state assembly built by  p - tert -butylcalix[8]arene molecules piled along the  a -axis direction.

Crystal structure of a p - tert- butylcalix[8]arene – N- methyl-morpholine complex