Luminescence Properties and Antibacterial Activity of [Ln 2 (NNA) 6 (Phen) 2 ]· nC 3 H 7 NO (Ln = Y, Eu, Gd, Pr, Sm, Tb, Yb, n = 0, 1, 2, NAA = 1-Naphthylacetic Acid, Phen = 1, 10-Phenanthroline)

Abstract

Rare earth binuclear complexes, [Ln(NAA) 3 (phen)] 2 nDMF (NAA = 1-naphthylacetic acid, phen = 1, 10-phenanthroline, Ln = Y, Eu, Gd, Pr, Sm, Tb, Yb, DMF = N,N′-dimethylformamide), have been prepared and have been characterized by elemental analysis, infrared spectra, electronic spectra, and X-ray crystallography. All complexes crystallize in the monoclinic system, space group P2 1 /c(Eu, Gd, Sm, Tb, Y) and triclinic system, space group P 1 (Pr, Yb). These isostructural complexes display bidentate chelating, bidentate bridging, and tridentate chelating-bridging carboxylate binding modes. At the same time, the luminescent properties and the antibacterium activity of the complexes in solvents were also investigated. At room temperature, the Eu, Sm, and Tb complexes exhibited characteristic luminescence emissions of the central metal ions under UV light excitation and could be significant in the field of supramolecular photonic devices. These complexes were active against Escherichia coli, Staphylococcus aureus, and Bacillus subtilis.