C. Knobler, E. Maverick, K. Trueblood
Dec 15, 1997
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Abstract
The potassium complex of the [2.1]cryptahemispherand 33,34,35-trimethoxy-5,10,15-trimethyl-22,25,30-trioxa-1, 19-diazapentacyclo [17.8.5.1 3,7 .1 8,12 .1 13,17 ] pentatriaconta-3,5,7(33),8,10,12(34),13,15,17(35)-nonaene, crystallizes from ethyl acetate with a thiocyanate counterion ([K(C 36 H 48 N 2 O 6 )]SCN}. The space group is Pnma. The longer cryptand-like bridge is disordered, departing from mirror symmetry because it is constrained to fold unsymmetrically by the geometry of the rest of the host. Five of the O atoms and the two N atoms of the host, as well as the N of the SCN- ion, are coordinated by the K + ion. The sixth O atom of the host is at 3.211 (3) A from the K + ion, about 0.5 A farther than the closest O atoms.