Synthesis, Crystal Structure, and Fluorescence Properties of a Two-Dimensional Copper(II) Complex with Schiff Base

摘要

A new Schiff base ligand C_(19)H_(13)NO5 (H2L) was synthesized using 2-aminoterephthalic acid and 2-hydroxy-1-naphthaldehyde. A complex of this ligand [Cu(C_(19)H_(11)NO5)(C2H6O)]_n was synthesized and characterized by IR, UV, fluorescence spectroscopy and X-ray diffraction single-crystal analysis. The crystal crystallizes in the monoclinic system, space group Pbca with a = 8.7745(18), b = 18.613(4), c = 24.644(5) A, V= 4024.9(14) A~3, Z= 8, F(000) = 1816, S= 1.009, ρ_(calcd) = 1.462 g cm~(-3), μ = 1.122 mm~(-1), the final R = 0.0477 and wR = 0.1594 for 4609 observed reflections (I> 2σ(I)). The Cu(II) is five-coordinated by one N atom and two O atoms from the Schiff base ligand and two carboxylate O atoms from another two ligands to form a distorted square-pyramidal geometry. Each ligand serves as a bridging ligand to link Cu~(2+) ions, leading to a two-dimensional coordination polymer. The fluorescence properties of the ligand and complex were also studied. The ligand shows strong fluorescence, and the fluorescence intensity is weakened after the Cu(II) complex formed.