Binary charge-transfer complexes using pyromellitic acid dianhydride featuring C—H⋯O hydrogen bonds

摘要

Four binary charge-transfer complexes were made using pyromellitic acid dianhydride (pmda), those being pmda–naphthalene (1/1), C10H2O6·C10H8, (I), pmda–fluoranthene (1/1), C10H2O6·C16H10, (II), pmda–9-methyl­anthracene (1/1), C10H2O6·C15H12, (III), and pmda–ethyl anthracene-9-carboxyl­ate (1/2), C10H₂O₆·2C₁₇H₁₂O₃, (IV). All charge-transfer complexes show alternating donor and acceptor stacks, which have weak C—H⋯O hydrogen bonds connecting the donor and acceptor mol­ecules. In addition, complex (I) has Z′ = 1/2, complex (II) has a Z′ = 2 and complex (IV) has half mol­ecule of pyromellitic acid dianhydride in the asymmetric unit.