C. Ryttersgaard, S. Larsen
Nov 15, 1998
Citations
0
Influential Citations
5
Citations
Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
Two independent ion pairs [(6-methoxy-4-quinolyl)(5-vinyl-1 -azoniabicyclo[2.2.2]octan-2-yl)methanol hydrogen 2,3-dihydroxybutanedioate] and a water molecule are found in the asymmetric unit of 2C 20 H 25 N 2 O 2 + .-2C 4 H 5 O - 6 .H 2 O. The two cations are virtually identical, but the two anions have markedly different stereochemistries. One of these anions adopts a unique conformation not observed previously for hydrogen tartrate ions. The packing resembles the arrangement in cinchonidinium (S)-mandelate, with hydrogen-bonded chains of alternating cations and anions. The herring-bone stacking of the quinoline ring systems of the cations resembles the pattern seen in other cinchona structures.