Magnetism and Luminescence of a MOF with Linear Mn Nodes Derived from an Emissive Terthiophene-Based Imidazole Linker.

A new terthiophene-based imidazole luminophore 5,5'-(1-thieno[3,4-d]imidazole-4,6-diyl)bis(thiophene-2-carboxylic acid) (TIBTCH, ) was synthesized in one step from previously reported 4,6-di(thiophen-2-yl)-1-thieno[3,4-d]imidazole (DTTI, ), and their photophysical properties were studied and compared accordingly. Under solvothermal conditions, reacting with Mn(OAc) yielded a new three-dimensional metal-organic framework (MOF, ) which was structurally defined by single-crystal X-ray diffraction. In , all Mn(II) ions octahedrally bind to carboxylate- atoms to form a linear Mn secondary building unit (SBU) that contains three distinct coordination modes. Importantly, exhibits dual functional properties of ligand-based emission and metal-based magnetic behaviors.