Three-dimensional bimetallic oxides constructed from molybdophosphonate chains and secondary-metal/4-pyridyltetrazole components

► Hydrothermal reactions were used to prepare a series of three-dimensional bimetallic oxides. ► Structural role of molybdophosphonate chains is noted. ► Structural influences of the secondary metal-ligand subunits are discussed. ► Persistence of the {Mo5O15(O3PR)2}4− building block is discussed. ► Structural chemistry of polyoxometalate-based metal organic frameworks (POMOFs) is presented.