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Keywords:

  • Lanthanides;
  • Coordination polymer;
  • 4-Acetamidobenzoate;
  • X-ray diffraction;
  • Luminescence

Abstract

The reactions of Ln(NO3)3·6H2O and 4-acetamidobenzoic acid (Haba) with 4,4′-bipyridine (4,4′-bpy) in ethanol solution resulted in three new lanthanide coordination polymers, namely {[Ln(aba)3(H2O)2]·0.5(4,4′-bpy)·2H2O} [Ln = Sm (1), Gd (2), and Er (3), aba = 4-acetamidobenzoate]. Compounds 13 are isomorphous and have one-dimensional chains bridged by four aba anions. 4,4′-Bipyridine molecules don’t take part in the coordination with LnIII ions and occur in the lattice as guest molecules. Moreover, the adjacent 1D chains in the complex are further linked through numerous N–H···O and O–H···O hydrogen bonds to form a 3D supramolecular network. In addition, complex 1 in the solid state shows characteristic emission in the visible region at room temperature.