Two Sm/Hg and Gd/Hg bimetallic complexes: Reasonable synthesis, structure and properties

Two new lanthanide mercury isonicotinic acid complexes [Sm(IA)(3)(H2O)(2)](2n)2n(HgCl4)center dot 3nCl center dot 7nH(3)O center dot 2nH(2)O (1; IA = isonicotinic acid anion) and {[Gd(IA)(3)(H3O)(2)](2)(Hg3Br8)}(n)(nHgBr(2))center dot 2nNO(3) (2; IA = isonicotinic acid anion) were synthesized. The crystal structures are characterized by single-crystal X-ray diffraction. Complex 1 is characteristic of a one-dimensional (1-D) chain-like structure, while complex 2 features a two-dimensional (2-D) layer-like structure. The photophysical properties of in solid state have been investigated by photoluminescence and solid-state UV/Vis diffuse reflectance spectra. The photoluminescence reveals that they display red or ultraviolet photoluminescence and, the photoluminescence are resulted from the characteristic emissions of the 4f electron intrashell transitions of the (4)G(5/2) -> H-6(J) (J = 7/2, 9/2 and 11/2 of the Sm3+ ions in 1) and the P-6(7/2) -> S-8(7/2) of the Gd3+ ions in 2. The CIE (Commission Internationale de I'Eclairage) chromaticity coordinates for 1 are (0.6597, 0.34) and its CCT (Correlated Color Temperature) is 12853 K. The solid-state UV/Vis diffuse reflectance spectra reveal that the semiconductor bandgaps are 5.01 eV and 2.77 eV.

Automated summary

Two new lanthanide mercury isonicotinic acid complexes with one-dimensional and two-dimensional crystal structures were synthesized and characterized. The photoluminescence properties revealed red or ultraviolet emissions resulting from specific electron transitions. The semiconductor bandgaps were determined to be 5.01 eV and 2.77 eV using solid-state UV/Vis diffuse reflectance spectra.