Search

Two new lanthanide mercury halide compounds with isonicotinic acid as a ligand, namely, [Gd(μ2-HIA) 2 (μ 3-IA) H2O) 2 (HgCl2)]n(nHgCl4)·3nH2O (1) (HIA = isonicotinic acid) and {[Nd(μ2-HIA) 3 (DMF)(H2O)]n}[(Hg4Br11)n] (2HgBr2)(nBr)·nH3O (2), were synthesized with solvothermal reactions and characterized by single-crystal X-ray diffraction. Compound 1 is characterized by a two-dimensional (2-D) layer-like structure, while compound 2 features a one-dimensional (1-D) chain-like structure. The lanthanide ions in both compounds are eight coordinated and show a square antiprism geometry. The mercury ions exhibit various coordination motifs. Compound 1 exhibits ultraviolet upconversion photoluminescence emission, whereas compound 2 displays red photoluminescence. The photoluminescence emissions arise from the characteristic 4f electron intrashell transitions of the 6P7/2 → 8S7/2 of the Gd3+ ions in compound 1 and the 4F9/2 → 4I9/2, 4F7/2 + 4S3/2→ 4I9/2, 4F5/2 + 2H9/2 → 4I9/2, 4F3/2 → 4I9/2 of the Nd3+ ions in compound 2. Compound 2 has CIE (Commission Internationale de l'Eclairage) chromaticity coordinates of (0.7142, 0.2857) and its CCT (correlated color temperature) is 138,224 K. Solid-state UV/Vis diffuse reflectance spectra revealed that the semiconductor band gaps of the compounds are 3.12 eV and 3.23 eV, respectively. Elemental analyses and FT-IR spectroscopy were carried out to confirm the purity of the compounds. [ABSTRACT FROM AUTHOR]

Two new lanthanide mercury materials, [Gd(IA)3(H3O)2Hg3Br6]nCl2n (1) and [La(IA)3(H3O)2Hg3Br6]nCl2n (2) (IA = isonicotinic anion), have been prepared under solvothermal conditions and characterized by single-crystal X-ray diffraction techniques. They are isomorphic and characterized by a three-dimensional (3-D) framework structure. The lanthanide ions are bound by eight oxygen atoms to exhibit a square antiprismatic geometry. The solid-state photoluminescence experiment discovers that compound 1 shows a strong emission in the red region. Compound 1 possesses CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of 0.7347 and 0.2653. Its CCT (correlated color temperature) is 6514 K. Compound 2 displays yellow photoluminescence and it has CIE chromaticity coordinates of 0.4411 and 0.5151. The CCT of compound 2 is 3633 K. Solid-state UV/Vis diffuse reflectance spectra revealed that their semiconductor band gaps are 2.16 eV and 2.85 eV, respectively. [ABSTRACT FROM AUTHOR]