Iodobismuthates with N-alkyl- or N,N′-dialkyl-4,4′-bipyridinium: syntheses, structures and dielectric properties

摘要: The solvothermal reactions of BiI3, KI, I2, 4,4′-bipyridine (4,4′-bipy), and a small amount water in alcohol acetonitrile produced four bipyridinium iodobismuthates {[MQ]3[Bi2I6(μ-I)3][Bi2I6(μ-I)2(MQ)2]3} (1, MQ+ = N-methyl-4,4′-bipyridinium), {[EQ]3[Bi2I6(μ-I)3][Bi2I6(μ-I)2(EQ)2]3} (2, EQ+ N-ethyl-4,4′-bipyridinium), [MV][BiI5] (Eur. J. Inorg. Chem., 2010, 5326) (3, MV2+ N,N′-dimethyl-4,4′-bipyridinium), [EV]2[Bi4I10(μ-I)4(μ3-I)2] (4, EV2+ N,N′-diethyl-4,4′-bipyridinium). In these reactions, 4,4′-bipy was partly or completely alkylated by alkyl groups generated from the cleavage C–O bond alcohols, forming N-alkyl-4,4′-bipyridinium cation (Q+) N,N′-dialkyl-4,4′-bipyridinium dication (V2+), respectively. Compounds 1–4 were characterized elemental analysis, IR, 1H NMR single-crystal X-ray diffraction analysis. optical, electrical conductive dielectric properties compounds investigated. constants Q+-based larger than values V2+-based ones, which showed that weak electrostatic interactions structures may benefit polarizability molecules, thereby resulting response under an external electric field, while strong between positive negative charge units would lead to low constant (low-k) behavior compounds.