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A new terbium complex, [Tb2(phenoxyacetic acid)6(H2O)3]n•nH2O (1) with a two-dimensional (2D) layered structure, has been prepared via a hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction technique. Compound 1 crystallizes in the space group Pī of the triclinic system with two formula units in one cell. Each terbium ion in compound 1 is coordinated by nine oxygen atoms to yield a monocapped tetragonal antiprism geometry. Photoluminescence spectra measured with solid-state sample of compound 1 demonstrate that the emission bands at 491, 545, 588 and 620 nm are observed from the 4f intrashell transitions of the Tb ions. These bands are originated from the D4 excited state to the F6, F5, F4 and F3 states, respectively. Solid-state diffuse reflectance spectrum reveals the existence of a wide optical band gap of 4.24 eV of compound 1.

Synthesis, crystal structure, photoluminescence and semiconductive properties of a novel terbium complex