Synthesis and X-Ray Study of a Charge-Transfer Complex of Pyrido[2,3-H]pyrrolo[1,2-a]quinoxaline–7,7,8,8-Tetracyano-p-quinodimethane (1:1)

Abstract

The structure of the title complex has been determined by a three-dimensional X-ray analysis. Triclinic crystals in space group Pī have lattice parameters a 7.0912(8), b 7.692(2), c 19.119(3)Ǻ, α 87.09(2),β 84.01(1),γ 82.72(1)°, Z 2. The structure was solved by means of direct methods and refined by full matrix least squares to R 0.039 and Rw 0.035 for 1671 observed reflections. Almost parallel tetracyanoquinodimethane (tcnq ) and pyridopyrroloquinoxaline molecules are stacked alternately along the a axis. Differences in C-C distances for the complexed tcnq molecule suggest a certain amount of charge-transfer interaction between donor and acceptor molecules.