Pb[NC5H3(CO2)2] with a pseudo-2D topology is a single component white light emitting material with a remarkably high quantum efficiency and thermal stability.
Lone
pair cation-based novel coordination compounds Sn[(pdc)(H2O)] (Sn–I) and (H2bpy)[Bi(pdc)2(Hpdc)]·5H2O (Bi–I) (pdc
= pyridine-2,6-dicarboxylate; bpy = 4,4′-bipyridine) were synthesized
through mild hydrothermal reactions. While Sn–I crystallizing in the polar space group, Pca21, exhibits a helical chain structure consisting of SnO3N distorted seesaws, 2,6-pdc linkers, and water molecules, Bi–I crystallizing in the centrosymmetric (CS) space
group, P1̅, reveals a pseudo-3D network composed
of BiO5N3 polyhedra, 2,6-pdc ligands, H2bpy2+ cations, and isolated H2O molecules.
The lone cations Sn2+ and Bi3+ in the title
compounds are in a highly deformed polyhedral environment. The single-crystal-to-single-crystal
transformation from Sn–I to the anhydrous Sn[(pdc)]
(Sn–II) with the polar noncentrosymmetric structure
was successfully achieved upon heating crystals of Sn–I. UV–vis diffuse reflectance spectra indicate that the introduction
of Sn2+ or Bi3+ red-shifts the adsorption edges
upon coordination. Powder second-harmonic generation (SHG) measurements
indicate that Sn–I and Sn–II are type-I phase-matchable and exhibit SHG intensity of ca. 15 and
35 times that of α-SiO2, respectively. Solid state
photoluminescence (PL) measurements indicate that Bi–I is an excellent green emitting phosphor with the quantum efficiency
up to 26% and outstanding decay lifetime of 1.82 ms at room temperature.
A novel monodispersed hierarchical nanocomposite catalyst of Cu/Fe3O4 was successfully synthesized through a short-time (just 4 h), facile, eco-friendly one-pot hydrothermal method. The as-prepared Cu/Fe3O4 nanocomposite was well characterized and the results showed that the products were spherical in morphology with diameter of about 100 nm. The BET surface area of the nanospheres was 37.16 m 2 /g, indicating that the product showed a porous character, and the major BJH pore size was 3.73 nm. The saturated magnetization of the Cu/Fe3O4 nanospheres was 48.0 emu g −1 , which facilitate their separation and recovery with the aid of an external magnet. In addition, the influences of experimental parameters such as the dosage of trisodium citrate dehydrate (Na3Cit) and urea as well as reaction duration time were investigated in detail to fully elucidate the formation mechanism. More charmingly, the Cu/Fe3O4 nanocomposites exhibited excellent catalytic activity towards the reduction of hazardous organic dyes (4-nitrophenol, 4-NP; congo red, CR; methylene blue, MB) in aqueous medium in the presence of NaBH4 with very fast kinetics and good stability. The relationship between Cu precursor addition amount and catalytic ability was also established. Considering the simplicity of operation procedure, short time, low cost as well as easy recycling of the catalyst, this preparation protocol may shed light on the fabrication of other metal oxides materials; and hopefully, this hierarchical nanocomposite may find potential applications in other domains like heavy metal removal or antibacterial.
Graphical Abstract:A novel monodispersed hierarchical nanocomposite catalyst, i.e. Cu/Fe 3 O 4 , aiming for efficient degradation of traditional dyes, was successfully synthesized through a short-time, facile, eco-friendly hydrothermal method.
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