A K+ COMPLEX OF A [2.1]CRYPTAHEMISPHERAND AT 295 K

The potassium complex of the [2.1]cryptahemispherand (3,7).1(8,12).1(1 3,7)]pentatria-conta-3,5,7(33),8, 10,12(34),13,15,17(35)-nonaene, crys tallizes from ethyl acetate with a thiocyanate counterion {[K(C36H48N2 O6)]SCN}. The space group is Pnma. The longer cryptand-like bridge is disordered, departing from mirror symmetry because it is constrained t o fold unsymmetrically by the geometry of the rest of the host. Five o f the O atoms and the two N atoms of the host, as well as the N of the SCN- ion, are coordinated by the Kf ion. The sixth O atom of the host is at 3.211 (3) Angstrom from the K+ ion, about 0.5 Angstrom farther than the closest O atoms.