Rational Assembly of Three-component Coordination Polymers as Heterogeneous Catalysts for CO Cycloaddition and Cyanosilylation Reactions.

Four new coordination polymers based on 5-(((1H-imidazol-2-yl)methyl)amino) isophthalic acid (HL) and auxiliary ligands (1,10-phenanthroline, 2,2'-bipyridine, and 4,4'-bipyridine), namely, {[Zn(HL)(phen)(HO)] ⋅ 2HO} (CP 1), {[Ni(HL)(phen)(HO)]} (CP 2), {[Ni(HL)(2,2'-bpy)(HO)] ⋅ 2HO} (CP 3) and {[Cd(HL)(4,4'-bpy)(HO)] ⋅ 2HO} (CP 4) were rationally assembled. Furthermore, these four CPs were screened as heterogeneous catalysts for CO cycloaddition and cyanosilylation reactions under mild conditions. The catalytic experiments showed that CP 1 had the better catalytic performance, excellent substrate tolerance and recyclability for the above two reactions.

Two 2D Metal-Organic Frameworks Based on Purine Carboxylic Acid Ligands for Photocatalytic Oxidation of Sulfides and CO Chemical Fixation.

Two two-dimensional (2D) layered metal-organic frameworks (MOFs), namely, {[Yb()(HO)NO]·2HO} (Yb-MOF) and [Er()(HO)Cl] (Er-MOF) (H = 5-((6-purin-6-yl)amino)isophthalic acid), were constructed by a solvothermal method and characterized. The catalytic performance study showed that the Yb-MOF could efficiently catalyze the oxidation of sulfides to sulfoxides under 15 W light-emitting diode (LED) blue light irradiation. Electron paramagnetic resonance spectroscopy and free-radical trapping experiments demonstrated that the photocatalytic reaction process involved O, and the corresponding mechanism was proposed.

Nitrogen-Rich Triazine-Based Covalent Organic Frameworks as Efficient Visible Light Photocatalysts for Hydrogen Peroxide Production.

Covalent organic frameworks (COFs) have been widely used in photocatalytic hydrogen peroxide (HO) production due to their favorable band structure and excellent light absorption. Due to the rapid recombination rate of charge carriers, however, their applications are mainly restricted. This study presents the design and development of two highly conjugated triazine-based COFs (TBP-COF and TTP-COF) and evaluates their photocatalytic HO production performance.

Assembly of Functional Co(II) Metal-Organic Frameworks through a Mixed Ligand Strategy: Structure and Photocatalytic Degradation Properties.

Four Co(II)-based metal-organic frameworks (MOFs) were constructed by a mixed ligand strategy under solvothermal conditions. The controllable modification of the bridging groups in the secondary building units was realized by changing the anions in MOFs -. The with 3D framework structure was obtained by regulating the solvent ratio following the synthesis process of .

Regioselective Synthesis of 3-Trifluoromethylpyrroles by [3 + 2] Cycloaddition of -Acyl α-Amino Acids and 2-Bromo-3,3,3-trifluoropropene.

A mild and concise method for the synthesis of 3-trifluoromethylpyrroles via base-mediated [3 + 2] cycloaddition of -acyl α-amino acids and 2-bromo-3,3,3-trifluoropropene is described. -Acyl α-amino acids serve as 1,3-dipole precursors without additional activating agents directly. A high level of regioselectivity was observed, regardless of the electronic nature and size of the substituents on 1,3-dipoles.

Effective detection of Ag, Hg and dye adsorption properties studies of Ln-MOFs based on a benzimidazole carboxylic acid ligand.

Five new lanthanide metal-organic frameworks (Ln-MOFs), namely {[Ln(L)]·Cl}, [Ln = Pr(1), Nd(2), Eu(3), Ho(4), Ce(5)], based on a benzimidazole carboxylic acid ligand [HL = 2-(2-carboxyphenyl)-1-benzo[d]imidazole-6-carboxylic acid] were synthesized by a solvothermal method. Ln-MOFs 1-5 have the same two-dimensional layered structures. Interestingly, 1-5 exhibit excellent adsorption performance to anionic dye Congo red (CR), with adsorption capacities of 2724 mg g, 2719 mg g, 2718 mg g, 327 mg g, and 2273 mg g, respectively.

Photophysical Properties of Naphthalene-oxacalix[]arene and Recognition of Fullerene C.

Three different pore sizes of oxacalix[]arene[]pyrimidines modified with a naphthalene substituent were synthesized and characterized by HRMS, H NMR, and single-crystal analysis ( and ). Steady-state spectroscopy indicates these naphthalene-oxacalix[]arenes exhibit good fluorescence properties, which isattributed to the locally excited (LE) state emission, and electrochemical results show that the photoinduced electron transfer (PET) process occurs from the naphthalene substituent to the linked pyrimidine. Nanosecond transient absorption spectra, singlet oxygen quantum yields (Φ = 45.

Syntheses, structures, and magnetic properties of mixed-ligand complexes based on 3,6-bis(benzimidazol-1-yl)pyridazine.

Six new metal-organic coordination polymers (CPs) [Ni(L)(2,5-TDC)(HO)] (1), [Ni(L)(1,3-BDC)(HO)] (2), [Ni(L)(1,4-BDC)(HO)] (3), [Mn(L)(2,5-TDC)(HO)] (4), [Mn(L)(2,6-PYDC)(HO)] (5) and [Mn(L)(1,4-NDC)] (6) were achieved by reactions of the corresponding metal salt with mixed organic ligands (L = 3,6-bis(benzimidazol-1-yl)pyridazine, 2,5-HTDC = thiophene-2,5-dicarboxylic acid, 1,3-HBDC = isophthalic acid, 1,4-HBDC = terephthalic acid, 2,6-HPYDC = pyridine-2,6-dicarboxylic acid, 1,4-HNDC = naphthalene-1,4-dicarboxylic acid) under solvothermal condition. CPs 1-6 were characterized by single-crystal X-ray diffraction, IR, TG, XRD and elemental analyses. Their structures range from the intricate 3D CPs 1, 3, 4 and 6 to the 2D coordination polymer 2 and the infinite 1D chain 5.

Synthesis and bioactivity of 5-(1-aryl-1H-tetrazol-5-ylsulfanylmethyl)-N-xylopyranosyl-1,3,4-oxa(thia)diazol-2-amines.

A series of new N'-[N-(2,3,4-tri-O-acetyl-β-d-xylopyranosyl)thiocarbamoyl]-2-[(1-aryl-1H-tetrazol-5-yl)sulfanyl]acetohydrazides 5a-5e were synthesized rapidly in high yields from 2-(1-aryl-1H-tetrazol-5-ylsulfanyl)acetohydrazides 3a-3e and 2,3,4-tri-O-acetyl-β-d-xylopyranosyl isothiocyanate 4, then 5a-5e were converted to a series of new 5-(1-aryl-1H-tetrazol-5-ylsulfanylmethyl)-N-(2,3,4-tri-O-acetyl-β-D-xylopyranosyl)-1,3,4-oxadiazole-2-amines 6a-6e and 5-(1-aryl-1H-tetrazol-5-ylsulfanylmethyl)-N-(2,3,4-tri-O-acetyl-β-D-xylopyranosyl)-1,3,4-thiadiazole-2-amines 7a-7e, respectively under mercuric acetate/alcohol system or acetic anhydride/phosphoric acid system, then deacetylated in the solution of CH(3)ONa/CH(3)OH. All of the novel compounds were characterized by IR, (1)H NMR, (13)C NMR, MS and elemental analysis. The structures of compounds 2e, 3e, 5a and 5c have been determined by X-ray diffraction analysis.