Two organic–inorganic hybrid frameworks with helical structures and large cavities constructed from poly(oxomolybdophosphates)

Abstract

Two novel poly(oxomolybdophosphates) have been synthesized hydrothermally and characterized by single-crystal X-ray diffraction, IR spectroscopy, TG analysis, cyclic voltammetry, and magnetic susceptibility. In compound 1, the bbi ligands form a series of unusual one-dimensional pores with large apertures through the π⋯π stacking and hydrogen bonding interactions, meanwhile, the right- and left-hand helical chains are constructed from the Mn[P₄Mo₆]₂-type secondary building units that are interspersed in the one-dimensional pore. Compound 2 exhibits a three-dimensional open-framework structure with large cavities where the protonated molecules of ethylenediamine and dissociative water molecules are located.