Controlled synthesis of bismuth sulfide nanorods by hydrothermal method and their photocatalytic activity

A newly designed multifunctional two-dimensional coordination polymer (2D CP) {[Cd(suc)(4-nvp)2]·2H2O}n, (1), (H2suc = succinic acid and 4-nvp = 4-(1-naphthylvinyl)pyridine) has been synthesized an...

Construction of a Succinate-Bridged Cd(II)-Based Two-Dimensional Coordination Polymer for Efficient Optoelectronic Device Fabrication and Explosive Sensing Application

Syntheses, structural characterizations, photoluminescence, and adsorption properties of three new azo-functionalized Cd(II)-MOFs, namely, {[Cd(azbpy)(msuc)]·2.5(H2O)}n (2), {[Cd(azbpy)(mglu)]·5(H2O)}n (3), and {[Cd1.5(azbpy)2(glu)]·(NO3)·MeOH}n (4) [where msuc2- = methylsuccinate; mglut2- = methylglutarate; glut2- = glutarate; azbpy = 4,4'-azobispyridine] have been reported. The compounds show different structures only with the variation of aliphatic dicarboxylates. The photoswitching behavior for the above-mentioned newly synthesized Cd(II)-MOFs along with one of our previously reported other azo-functionalized Cd(II)-MOF, namely, {[Cd(azbpy)(suc)]·2(H2O)}n (1), has been studied extensively. At photoilluminated condition, the conductivity values can draw a clear structure-property relationship among the structures of compounds 1-4. Single crystal structural analysis reveals that all the compounds exhibit a three-dimensional (3D) framework connected by azbpy linker and respective aliphatic dicarboxylate through their bis-chelating mono/bis oxo-bridging fashion. Compounds 1-3 exhibit an iso-structural honeycomb like 3D framework showing the same coordination environments, where the metal-carboxylate 2D sheets of compounds 1-3 are pillared by N,N'-donor azbpy linkers. On the other hand, compound 4 exhibits a 2-fold interpenetrated 3D framework with a little difference in its coordination environment and the pillaring of 1D metal-carboxylate ladder by azbpy linkers. All the compounds significantly demonstrate their enhanced sensitivity under light rather than the dark condition. The gas and solvent vapor sorption studies have been performed for the synthesized compounds 2-4. Moreover, compound 2 exhibits an enhanced type IV selective CO2 adsorption isotherm over N2 along with the appearance of gate opening phenomena in that.

Set of Multifunctional Azo Functionalized Semiconducting Cd(II)-MOFs Showing Photoswitching Property and Selective CO2 Adsorption.

This review summarizes the syntheses and applications of metal oxysulfides. Bulk compounds of rare earth and transition metals are discussed in the section Introduction. After a presentation of their main properties and applications, their structures are presented and their syntheses are discussed. The section Bulk Materials and Their Main Applications is dedicated to the growing field of nanoscaled metal oxysulfides. Synthesis and applications of lanthanide-based nanoparticles are more mature and are discussed first. Then, works on transition-metal based nanoparticles are presented and discussed. Altogether, this review highlights the opportunities offered by metal oxysulfides for application in a range of technological fields, in relation with the most advanced synthetic routes and characterization techniques.

/pdf/metal-oxysulfides-from-bulk-compounds-to-nanomaterials-1cdgoy0v1j.pdf

Metal Oxysulfides: From Bulk Compounds to Nanomaterials

Structures and optical absorption of Bi2OS2 and LaOBiS2

[Bi2O2]-containing tetragonal compounds have received enormous attention due to unique functions including ferroelectricity, photocatalysis, and superconductivity. Here, a new layered compound Bi9O7.5S6 was synthesized via a facile hydrothermal route. The compound, belonging to a new structure type crystallizes in a rhombohedral system with space group R3m (a = 4.0685(1) A, c = 31.029(5) A, V = 444.8(1) A3, Z = 1). The overall crystal structure consists of alternatively packed unique [Bi2O2] and [BiS2] layers along [001] which are combined with each other by van der Waals interaction. The phase purity of the product is confirmed by powder X-ray diffraction. XPS analyses indicate +3 for Bi and −2 for S atoms. The temperature dependence of resistivity ρ(T) indicates that the semiconducting sample follows the mechanisms of variable range hopping (VRH) and adiabatic small polaron hopping (SPH). The direct-transition band gap, Eg = 1.27 eV derived from optical absorption spectrum, falls in the optimal region ...

Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide.

The new compound Bi9O7.5S6 is hydrothermally synthesized from Bi(NO3)3, thiourea, KOH, and LiOH dissolved in a 1:1 mixture of H2O and EtOH (autoclave, 180 °C, 72 h).

The invention relates to a hydrothermal preparation method of a laminar multi-element photoelectric sulfide. The chemical composition of the multi-element photoelectric sulfide is AQ2MS3, AQMS2, AQM2S6, A2QMS4, A2Q2MS4, A2Q2M2S6, A2QM2S6, A3Q9M4S12, A3Q3M2S8, AQMS3, or A4Q6M3S14, wherein A is any one of Li, Na, K, Rb and Cs; Q is any one of Cr, Mn, Fe, Ni, Cu, Zn, Ag, Cd and Sn; and M is any one of Sb, Bi, Ge, Sn, As, Mn, Nb and W. The preparation method comprises the following steps: uniformly mixing a Q source and an M source in a stoichiometric ratio with excess sulfur source, AOH and water, and then performing hydrothermal reaction in a hydrothermal kettle at 150-250 DEG C for 1-10 days; and separating out a reaction product, washing, centrifuging and drying to prepare the multi-element photoelectric sulfide. Through the insertion of alkali metal ions in reaction raw materials, a compound with a laminar structure is easy to obtain.

Hydrothermal preparation method of laminar multi-element photoelectric sulfide

The development of solar-driven organic synthesis processes as an alternative to conventional thermo-catalytic technologies is of great research significance in academia and industry. Herein, we looked into the photoinduced Baeyer–Villiger oxidation of cyclohexanone based on the Mukaiyama method for the first time. We fabricated a crystalline polyoxometalate-based metal–organic framework photocatalyst, CR-SiW12, which represents the first example of trinuclear ruthenium clusters involved in the construction of polyoxometalate-based metal–organic frameworks. The cyclohexanone was efficiently converted to ε-caprolactone under visible light (>400 nm) irradiation with CR-SiW12 as the catalyst, with a reaction turnover number and turnover frequency recorded as 941 and 274.5 h–1, respectively, and the apparent quantum yield at 465 nm was measured to be 8.4%. Moreover, CR-SiW12 exhibited high structural stability and reaction reusability where reaction yield remained high at 91.3% after five consecutive reaction cycles. This work offers a promising strategy for accomplishing Baeyer–Villiger oxidation reactions under green conditions. 

Enhanced Photoinduced Baeyer–Villiger Oxidation of Ketones by Introducing Trinuclear Ruthenium Clusters into Polyoxometalate-Based Metal–Organic Frameworks

Sha Meng

Papers

Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide.

Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide.

Hydrothermal preparation method of laminar multi-element photoelectric sulfide

Enhanced Photoinduced Baeyer–Villiger Oxidation of Ketones by Introducing Trinuclear Ruthenium Clusters into Polyoxometalate-Based Metal–Organic Frameworks