Synthesis and characterization of the firstly observed two brilliantly triboluminescent lanthanide complexes: 2-hydroxyethylammonium and pyrrolidinium tetrakis(dibenzoylmethide) europate(III). Crystal structure of one brilliantly triboluminescent acentric complex: dimethylbenzylammonium tetrakis(dibenzoylmethide)europate

Abstract

Triboluminescent phenomena of 2-hydroxyethylammonium tetrakis (dibenzoylmethide)europate ( 1) and pyrrolidonium tetrakis(dibenzoylmethide)europate ( 2) were firstly observed, and the crystal structure of dimethylbenzylammonium tetrakis(dibenzoylmethide)europate ( 3) was successfully determined after more than 35 years later. Crystal data for 3: orthorhombic, space group Pca2 1 (No.29), a=25.697(2), b=9.462(3), c=15.023(3) Å, Z=4. The Eu atom exhibits an eight-coordinate tetragonal antiprismatic geometry with an average Eu–O bond distance of 2.42(2) Å. Triboluminescent spectra of 1– 3 are basically similar to that of their fluorescent spectra, and the observed triboluminescent emission correlates well with their acentric space group.