3 COMPLEXES OF A [2.2]CRYPTAHEMISPHERAND

The macrocyclic host 36,37,38-trimethoxy-5,10,15-trimethyl-22, diazape ntacyclo-[17.8.8.1(3,7).1(8),(12).1(13,17)] octatriaconta-3,5,7(36),8, 10,- 12(37),13,15,17(38)-nonaene contains a somewhat flexible cavity l ined with seven O atoms and two N atoms. The structures of three of it s complexes are reported here: that with sodium thiocyanate, (I) {[Na( C38H52N2O7)]SCN}, at 296 K, and those with potassium thiocyanate, (II) {[K(C38H52N2O7)]SCN.H2O}, and caesium perchlorate, (III) {[Cs(C38H52N 2O7)]ClO4.H2O}, at 156 K. The host adapts well to Cs+, with effective ninefold coordination; it adapts nearly as well to Iii, but is not suf ficiently flexible to be a good complexer for the much smaller Na+ ion . In structures (II) and (III), a water molecule forms hydrogen bonds between an O atom of the host and an atom of the anion [N of SCN- in ( II) and O of ClO4- in (III)].