Porous Metal–Organic Frameworks with 5‑Aminoisophthalic Acid as Platforms for Functional Applications about High Photodegradation Efficiency of Phenol

Four novel complexes, [CoL­(H₂O)] (<b>1</b>), [ZnL­(H₂O)] (<b>2</b>), [Ni­(HL)₂(H₂O)₂]·2H₂O (<b>3</b>), and [CdL­(H₂O)]·H₂O (<b>4</b>) (L = 5-aminoisophthalic acid), were successfully synthesized by the reaction of transition metal salts and 5-aminoisophthalic acid at hydrothermal conditions. The four complexes were characterized by element analysis, infrared spectra, UV–vis spectra, powder X-ray diffraction analysis, and thermogravimetric analysis. X-ray single-crystal diffraction analysis showed that the four complexes were 3D network structures and contained pores with sizes of 7.05 to 14.67 Å. In addition, we investigated the photodegradation ability of the four complexes for phenol solution under UV irradiation. The results showed that the four complexes had a different degree of degradation ability to phenol solution. At the same time, we found that the degradation process was in accordance with the pseudo-second-order dynamics model, that is, the rate of degradation is controlled by the extra-particle process such as surface adsorption. Moreover, we further confirmed by high-performance liquid chromatography that the complexes are indeed a significant ability to degrade phenol

Polyoxidovanadate complexes: synthesis, structures and catalytic oxidative bromination of phenol red

<p>By selecting appropriate ligands, two polyoxidovanadate complexes, [Ni(en)₂]₃[V₁₈O₄₂Cl]·7H₂O·2H₃O⁺ (<b>1</b>) and [H₂N(CH₃)₂]₃[PV₁₄O₄₂]·2TMP·6H₃O⁺ (<b>2</b>), have been synthesized at different pH values using V₂(SO₄)₃, Ni(CH₃COO)₂, and H₆TTHA (for <b>1</b>), VO(acac)₂ and TPP (for <b>2</b>) (en = C₂H₈N₂, TPP = thiamine pyrophosphate, TMP = thiamine monophosphate, H₆TTHA = 1,3,5-triazine-2,4,6-triamine hexaacetic acid). The complexes have been characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TG), and single crystal X-ray diffraction. The complexes catalyze the oxidation of the organic substrate phenol red in the presence of H₂O₂ and bromide, and the reaction system is considered as a model for hydrogen peroxide determination. The reaction rate constants (<i>k</i>) for <b>1</b> and <b>2</b> are calculated as 3.729 × 10³ and 4.083 × 10³ (mol L)⁻² s⁻¹. The maximum conversion rate of phenol red for <b>1</b> is 83.32%, while for <b>2</b> is 81.12%.</p

Self-Assembled Cd-MOF Material Supported by a Triazine Skeleton: Stimuli Response to Traces of Nitroaromatics and Amines

As an important chemical raw material, nitro aromatic compounds (NACs) and primary aromatic amines are widely used in the chemical industry. However, they are serious pollutants, which have already threatened human beings and the environment. Therefore, it is critical to develop a simple strategy to detect them. Luminescent metal–organic framework (LMOF) sensors have been promising platforms for sensing NACs and aromatic amines because of stable pore structure, outstanding optical properties, fast response, excellent sensitivity, and low detection limit. In this work, a novel LMOF [Cd3(TDPAT) (H2O)6(μ-H2O)3]·4H2O·2DMF (Cd-MOF) was constructed by 5,5′,5″-(1,3,5-triazine-2,4,6-triyltriimino) tris­(azanediyl) trisophthalate (H6TDPAT) and Cd­(NO3)2·4H2O. The structure was analyzed in detail and the results showed that Cd-MOF presented a unique hexagonal-petal shape composed of binuclear building blocks [Cd2O13] connected by a triazine hexacarboxylic skeleton, which also showed an interesting three-dimensional porous structure. Through fluorescence properties and sensing experiments, we found that it possessed strong fluorescence emission and exhibited an excellent sensitivity for the detection of NACs. It could correspond sensitively to 2,4,6-trinitrophenol (TNP), 2,4-dinitrophenol (DNP), p-dinitrobenzene (p-DNB), o-dinitrobenzene (o-DNB), p-nitrophenol phenol (PNP), and o-nitrophenol (ONP). Notably, it exhibited extremely low detection limits for TNP, DNP, and PNP at 0.089, 0.092, and 0.016 μM, respectively. In addition, it could distinguish a class of isomers of primary aromatic amines (OPD, MPD, and PPD) through fluorescence properties experiment and detect OPD and MPD sensitively

Functional Sensing Materials Based on Lanthanide N‑Heterocyclic Polycarboxylate Crystal Frameworks for Detecting Thiamines

A family of polymers [Ln₂(ad)­(Had)₂­(NO₃)₂(H₂L)₂­(H₂O)₂]­·2H₂O (Ln = Nd (<b>1</b>), Sm (<b>2</b>), Eu (<b>3</b>)) and [Ln­(ad)­(H₂L)­(H₂O)₂]­·NO₃­·2H₂O (Ln = Gd (<b>4</b>), Tb (<b>5</b>), Dy (<b>6</b>)) was synthesized. The polymers were characterized by powder X-ray diffraction (PXRD), infrared spectra (IR), single-crystal X-ray diffraction, thermogravimetric analysis (TG), and elemental analysis (C, H, N). On the basis of the luminescence properties of the polymers, we used polymer <b>5</b> as an example to detect thiamines (TPP, TMP, TCl). In the way that was expected, polymer <b>5</b> could quickly detect TPP, TMP, and TCl, which could be used as a typical luminescence sensing material in the field of optical detection

Synthesis, structures, and catalytic studies of new copper(II) complexes with arene-linked pyrazolyl methane ligands

<div><p>Two new copper complexes, [Cu₂(L1)(dipic)₂(H₂O)₂]⋅2H₂O (<b>1</b>) and [Cu₂(L2)(dipic)₂(H₂O)₂]⋅3H₂O (<b>2</b>) (L1 = 1,4-bis((1<i>H</i>-pyrazol-1-yl)methyl)benzene; L2 = 1,4-bis((3,5-dimethyl-1<i>H</i>-pyrazol-1-yl)methyl)benzene; and H₂dipic = 2,6-pyridinedicarboxylic acid), were synthesized by the reaction of copper salt, arene-linked pyrazolyl methane ligands, and 2,6-pyridinedicarboxylic acid in 95% C₂H₅OH. They were characterized by elemental analysis, IR, UV–vis, single-crystal X-ray diffraction analysis, X-ray powder diffraction, and thermogravimetric analysis. We explored the application of the copper complexes in bromination reactions; the complexes exhibited bromination catalytic activity in single-pot reaction for the conversion of phenol red into bromophenol blue. A feasible bromination reaction mechanism of copper complexes was proposed.</p></div