2:1 complexes of 2-chloro-4-nitrobenzoic acid and 2-chloro-5-nitrobenzoic acid with pyrazine.
2-chloro-4-nitrobenzoic acid and 2-chloro-5-nitrobenzoic acid form O--H...N hydrogen bonds with pyrazine to afford 2:1 complexes of 2C7H4ClNO4*C4H4N2, (I) and (II), respectively, that are located on inversion centers. The 2C7H4ClNO4*C4H4N2 units in both complexes are connected by weak C--H...O hydrogen bonds; the units build a three-dimensional hydrogen-bond network in (I) and a ribbon structure in (II).
Ishida
H
H
Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan. ishidah@cc.okayama-u.ac.jp
Rahman
B
B
Kashino
S
S