Triple-stranded helical and plywood-like arrays:: Two uncommon framework isomers based on the common one-dimensional chain structures

Two 1D polymeric chain structures, namely, {[Ag(3-impmd)]center dot(SbF6)center dot CH2Cl2}(infinity) (1) and {[Ag(3-impmd)]center dot(NO3)center dot MeOH}(infinity) (2), were assembled from the flexible organic spacer N,N'-bis(3-imidazol-1-yl-propyl)-pyromellitic diimide (3-impmd) with AgSbF6 and AgNO3, respectively. Complex 1 crystallizes with the 1D chains displaying cross-like arrangement, while Complex 2 presents a triple-stranded helical structure, which is dictated by the anions and further assembled into 3D architectures via various weak supramolecular interactions. The luminescent properties of both complexes were investigated in solution and solid state.