Two new layered complexes supported by helical image chains: Hydrothermal syntheses and crystal structures of [M(dpa)V2O6] (M = Zn(II) and Cu(II); dpa = 2,2′-dipyridylamine)

Two layered complexes supported by image chains, [M(dpa)V2O6] (1, M = Zn2+; 2, M = Cu2+; dpa = 2,2′-dipyridylamine), have been synthesized hydrothermally. Structural analysis reveals that they consist of helical image chains bridged through {M(dpa)}2+ fragments into 2D layered structures. The left and right image helical chains appear alternately in the different oxide layers for 1, but these are alternated in the same layer for 2.