CRYSTALLINE COMPLEXES OF 18-CROWN-6 WITH METHYL SULFONATES

The macrocyclic polyether 18-crown-6 forms crystalline complexes with methyl sulfonates. Most complexes have a 2: 1 (sulfonate:crown) stoich iometry whereas small aliphatic sulfonates give a 1 : 1 ratio. In the 2: 1 ratio complexes, the guest molecules are coordinated above and be low the crown in such a way that the dipoles are compensated. In the 1 : 1 ratio complexes, there is a polymeric type association with the t wo ends of the sulfonate interacting with different crown molecules. A crystal structure is reported for each type of complex. The complex 1 8-crown-6 . CH3SO3CH3 (7) crystallizes in the monoclinic system, space group P2(1)/c with Z = 4. The unit cell dimensions are as follows: a = 8.525(4), b = 16.401(7), c = 15.071(6)space, beta = 113.92(3)-degree s. Final R(w) = 0.064 for 3650 reflections. The complex 18-crown 6 . ( C6H5SO3Me)2 (1) CryStallizes in the monoclinic system, space group P2( 1)/c with Z = 2. The unit cell dimensions are as follows: a = 8.101(3) , b = 17.136(5), c = 12.990(5) angstrom, beta = 121.30(3)-degrees. Fin al R(w) = 0.048 for 2913 reflections.