Molecular recognition via lodo ⋯ nitro and lodo ⋯ cyano interactions: crystal structures of the 1 : 1 complexes of 1,4-diiodobenzene with 1,4-dinitrobenzene and 7,7,8,8-tetracyanoquinodimethane (TCNQ)

Abstract

Mutual recognition of iodo and nitro groups through symmetrical iodo–nitro bridging interactions generates symmetrical molecular ribbons in the crystal structure of the 1 : 1 complex of 1,4-diiodobenzene 1 with 1,4-dinitrobenzene 2; however, in the crystal structure of the 1 : 1 complex of 1 with TCNQ, the mediation of simple, non-bridging –I ⋯ NC interactions leads to the formation of skewed ribbons.