Single molecule magnet features in luminescent lanthanide coordination polymers with heptacoordinate Dy/Yb() ions as nodes

Two sets of 1D/2D lanthanide coordination polymers with formulas of Ln(oqa) 3 ·2H 2 O [Hoqa = 2-(4-oxoquinolin-1(4 H )-yl) acetic acid, Ln = Dy ( 1 ), Yb ( 2 )] and Ln(oaa) 2 (HCOO)(H 2 O) [Hoaa = 2-(9-oxoacridin-10(9 H )-yl) acetic acid, Ln = Dy ( 3 ), Yb ( 4 )] have been synthesized and their physical properties were investigated. All four complexes are constructed from seven-coordinate lanthanide ions and corresponding organic linkers. The lanthanide ions in 1 and 2 adopt a pentagonal bipyramid coordination geometry, whereas the coordination geometry of lanthanide ions in 3 and 4 can be described as a capped octahedron. Slow magnetic relaxation behaviors were observed in these four products at a zero/non-zero static magnetic field. Complexes 1 , 2 and 4 exhibit the characteristic emission of Ln( iii ) ions, whereas complex 3 shows ligand-based emission. Bright yellow light emission was also observed when a voltage was applied, demonstrating the potential of 1 for application in light-emitting diodes (LEDs). Compounds 3 and 4 are the first examples of lanthanide complexes based on Hoaa ligands. Four 1D/2D coordination polymers constructed from low-coordinate lanthanide ions and organic linkers with interesting magnetic and luminescence properties are reported.