Six-coordinated rare earth organoarsinate complexes: Crystal structure, luminescent and magnetic properties investigation

An isostructural series of rare earth complexes has been synthesized by using the dimethylarsinate ligand. All complexes have the formula [Ln(Me2AsO2)(3)][H2O](8) (Ln = specialIntscript Y(10)). They are the first rare earth complexes ligated by organoarsinate. Crystallographic characterizations reveal that all the compounds feature 1D chain-like arrangements, in which two rare earth ions are bounded by three dimethylarsinate ligands (syn, mu 2-n(1):n(1)) , the rare six-coordinated rare earth ions display ideal octahedron coordination geometry. The solid state photoluminescent studies reveal that compounds 2 and 4 exhibit the characteristic emission band of the EuIII and TbIII ions respectively. Magnetic measurements indicate specialIntscript shows magnetocaloric effect (MCE) with entropy change of 24.92 J kg(-1) K-1 for triangle H = 0 - 7 T at 3 K. The specialIntscript and specialIntscript show field induced slow relaxation, which is rare for octahedron coordinate LnIII compounds.

Automated summary

An isostructural series of rare earth complexes ligated by organoarsinate ligand was successfully synthesized. These complexes exhibit chain-like structures and display magnetocaloric effect and characteristic emission bands.