Solvent-Free Mechanochemical Synthesis of Strongly Luminescent Eu(III) Hybrid Materials Using Tetramethylammonium Salts

A solvent-free mechanochemical treatment is used to synthesize an Eu(III) hybrid material containing Eu(D-facam)3 and tetramethylammonium acetate (TMAOAc), mechEu(D-facam)3-TMAOAc. The synthesis method is efficient and the reaction occurs within 10 s. Mechanochemically prepared mechEu(D-facam)3-TMAOAc is proven to be a bimetallic compound, in which TMAOAc functions as a bridging molecule between multiple Eu(III) complexes. Compared with Eu(D-facam)3, mechEu(D-facam)3-TMAOAc exhibits ultra-high luminescence, excellent circular polarization activity and thermal stability.