Two Coordination Polymers and Their Silver(I)-Doped Species: Synthesis, Characterization, and High Catalytic Activity for the Photodegradation of Various Organic Pollutants in Water

Encapsulated anion-dominated photocatalytic and adsorption performances for organic dye degradation and oxoanion pollutant capture over cationic Cu(i)-organic framework semiconductors

Decontamination of industrial wastewater containing toxic organic dye molecules and oxoanions is urgently desirable for environmental sustainability and human health. Water-stable porous metal-organic frameworks (MOFs) have emerged as highly efficient photocatalysts and/or adsorbents for water purification through controllable integration of the constitutive requirements. To reveal the inclusion anion effect of microporous MOFs on wastewater treatment, two isostructural MOFs incorporating positive charge and semiconductive characteristics, {[Cu(tpt)]·3H₂O·0.5SO₄}_n (1) and {[Cu(tpt)]·2H₂O·ClO₄}_n (2, tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine), have been synthesized and employed as dual-functional materials for both dye photodegradation and oxoanion removal. The two MOFs possess the same 3-fold interpenetrating cationic backbones but are encapsulated by highly disordered sulfate or perchlorate in the open channels. These included anions have significantly tuned the hydrophilicity of the channels, extended the visible-light absorption, optimized the bandgap and decreased the conduction band potential. Under the low-energy irradiation of a 30 W LED lamp, MOF 1 has selectively and efficiently degraded rhodamine B compared to 2 with accelerated kinetics, resulting from the stronger reduction ability and less migration resistance of the photogenerated electrons. Instead, MOF 2 can quickly capture harmful MnO₄^- and Cr₂O₇^2- by exchanging with the entrapped ClO₄^-, with maximum adsorption amounts of 557 and 168 mg g^-1, respectively, under ambient conditions. The improved decolorization of the aqueous solution over 2 benefits essentially from the shape and charge memory effect and the smaller hydration energy of ClO₄^- than SO₄^2-. These interesting observations highlight the importance of the included anions inside the porous MOF semiconductors on wastewater treatment.

Assembly, Structure, and Properties of Six Coordination Polymers Based on 1,3,5-Tri-4-pyridyl-1,2-ethenylbenzene

Six coordination polymers including [Cd(tpeb)X2]n (1: X=Br, 2: X=I), [Cu(tpeb)I]n (3), [Cd2I2(tpeb)2(1,4-bdc)]n (4), {[Co(tpeb)(dpa)]·MeCN}n (5), and {[Ni2(tpeb)3(oba)2]·solvent}n (6) were prepared from solvothermal reactions of 1,3,5-tri-4-pyridyl-1,2-ethenylbenzene (tpeb) with CdII, CuI, CoII, or NiII salts in the absence or presence of 1,4-benzenedicarboxylic acid (1,4-H2bdc), 2,2′-biphenyldicarboxylic acid (H2dpa), and 4,4′-oxybisbenzoic acid (H2oba). Compounds 1–3 have 1D chain structures while 4 holds a 2D wave-like network. Compound 5 adopts a 3D (3,5)-connected net with a Schläfli symbol of 33.48.513.63.7 and 6 possesses a 3D 5-connected net with a Schläfli symbol of 42.65.7.82. Compound 2 as a representative photocatalyst shows efficient degradation of rhodamine B in water while 5 displays highly selective sensing of p-nitrophenol in water through fluorescence quenching.

Assembly of silver-oxo complexes based on N-diphenylphosphanylmethyl-3-aminopyridine and their structures, photocatalysis and photocurrent responses

Compound {[Ag(μ-η²-Sal)(3-dppmapy)]}_n exhibits prompt anodic photocurrent responses and high photocatalytic performance in the degradation of organic dyes.

Highly selective detection of Hg2+ and MeHgI by di-pyridin-2-yl-[4-(2-pyridin-4-yl-vinyl)-phenyl]-amine and its zinc coordination polymer

Di-pyridin-2-yl-[4-(2-pyridin-4-yl-vinyl)-phenyl]-amine and its zinc coordination polymer are used to detect Hg²⁺ and MeHgI with high selectivity.

Construction of five Zn(ii)/Cd(ii) coordination polymers derived from a new linear carboxylate/pyridyl ligand: design, synthesis, and photocatalytic properties

Reactions of Cd(OAc)₂/Zn(OAc)₂ with a new linear carboxylate/pyridyl ligand under different templates via an in situ ligand transformation reaction produced five new CPs. Complexes 1–5 exhibited relatively good photocatalytic activity towards the degradation of methylene blue.