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

Abstract

A new terbium complex, [Tb 2 (phenoxyacetic acid) 6 (H 2 O) 3 ] n •nH 2 O (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 3+ ions. These bands are originated from the 5 D 4 excited state to the 7 F 6 , 7 F 5 , 7 F 4 and 7 F 3 states, respectively. Solid-state diffuse reflectance spectrum reveals the existence of a wide optical band gap of 4.24 eV of compound 1.

Photoluminescent Lanthanide Coordination Polymers for Ammonia Gas Detection at Ambient Temperature and Humidity

“…Hpoa with mostly monodentate and chelating coordination ability, on the other hand, should disrupt the dense framework formation, leading therefore to open frameworks. With respect to the sensitization process, , both 2,5-H 2 pydc and Hpoa are recognized as effective sensitizers and can effectively promote the desired f–f emissions. , The pyridine ring of 2,5-H 2 pydc and the O atom and phenyl ring of Hpoa, in addition, should be available to interact with ammonia through hydrogen bonding interactions and consequently induce viable alteration in the f–f emission profile of Ln III .…”