N-Methylpyridinium 3-cyano-4-(dicyanomethylene)-5-oxo-4,5-dihydro-1H-pyrrol-2-olate.
The crystal structure of the title compound, C(6)H(8)N(+).C(8)HN(4)O(2)(-), is characterized by three independent ion pairs (A, B and C) in the asymmetric unit. Each ion pair consists of an anion and a cation, and the three ion pairs have similar geometric parameters. All the anions are arranged as dianion dimers via two N-H.O hydrogen bonds and the dimers form one-dimensional columns parallel to the b axis as a result of pi-pi interactions. The cations are also stacked, in two different ways: one type of stacking consists of alternating A and B cations, while the other type consists of C cations only. Each dianion dimer stack is surrounded by eight stacks of cations and is not connected directly to other dianion stacks.
Tafeenko
Viktor A
VA
Chemistry Department, Moscow State University, 119899 Moscow, Russia. tafeenko@biocryst.phys.msu.su
Nikolaev
Aleksander N
AN
Peschar
Rene
R
Kaukova
Olga V
OV
Schenk
Henk
H
Aslanov
Leonid A
LA