Anions In Aqueous Solution Research Articles

Development of colorimetric probe using robust zinc-MOF and its consistent melamine sponge composite: Instantaneous N3–, La3+ sensing and degradation applications

The crystalline sponge method (CSM), which involves soaking a target molecule into a crystalline metal-organic framework (MOF), offers a promising approach by eliminating the need for high-quality single crystals of the target compound. To broaden the scope of compounds that can be analyzed using CSM, it is essential to investigate various MOFs. In this study, we focused on evaluating the potential of a zinc-based MOF, specifically [Zn3(Cei)2((Bimb)3] (Zinc-MOF), as a CSM host. We successfully synthesized and thoroughly characterized Zinc-MOF. Additionally, we developed a Zinc-MOF@melamine sponge (Zinc-MOF@MS) composite, which exhibited significant photocatalytic activity by degrading hazardous organic dyes such as Rose Bengal (RB) and Crystal Violet (CV), achieving degradation efficiencies of 98.95 % and 92.51 %, respectively, after 120 min of exposure to visible sunlight. The luminescent properties of the Zinc-MOF were also explored, demonstrating strong luminescent emission and excellent chemical stability. Furthermore, Zinc-MOF showed remarkable sensing capabilities, selectively detecting La³⁺ cations and N₃⁻ anions in aqueous solutions through luminescence quenching.

Impact of dicarboxystilbene impurities on the properties of swift heavy ion latent tracks in PET films

We present a new hypothesis and supporting experimental evidence about the essential role played by small impurities of dicarboxystilbene in the process of UV treatment of PET films irradiated with swift heavy ions (SHI). This treatment both forms highly selective membranes with permeability values comparable to natural ones (the track-UV technique) and sharply accelerates the etching of latent tracks in membrane production (the track-etching technique). We hypothesize (1) that these high permeability value is due to the presence of a molecular motor of an Archimedes screw type in the central part of the latent track formed by photoinduced trans-cis isomerization of dicarboxystilbene molecules that are anchored in helical conformations in the latent track; and (2) that the acceleration of etching rates is due to the preferential accumulation of phenanthrene-type molecules in the central part of the latent track due to the existence of a cyclization channel for photoexcited molecules of cis-dicarboxystilbene. In the presence of alkali solution, phenanthrene molecules release electrons which behave as strong anions in aqueous solution, catalyzing alkaline hydrolysis of PET molecules in the central part of the track. We present experimental observations of photoinduced changes in transmission light intensity after track-UV light treatment of both pristine and SHI irradiated PET films that confirm the presence of trans-cis isomerization of dicarboxystilbene molecules and show their contribution to the formation of new helical conformations in SHI irradiated PET films during the light treatment.

In-depth quantitative and theoretical study of ambident electrophilies of 2-bromo-3-X-5-nitrothiophenes

As part of our continuing studies into the electron deficient nature of five-membered ring heterocycles, specifically 2‑methoxy-3-X-5-nitrothiophenes and 3-X-5-nitrothiophene, we report here a kinetic study of σ-complexation reactions involving 2‑bromo-3,5-dinitrothiophene 1 and various nitroalkyl anions in aqueous solution at 20 °C. Theoretical calculations at the density functional theory (DFT) level were performed to confirm the proposed mechanism. From the previously reported nucleophilicity parameters N and sN for the nucleophiles 2 and the derived second-order rate constants, the electrophilicity parameter (E) at the C-4 position of thiophene 1 was quantified according to the linear free enthalpy relationship log k (20 °C) = sN (E + N). Mayr's approach accurately predicted the rate constants for the reactions of this thiophene 1 with a series of para-substituted phenoxide anions in water at 20 °C. A reasonable correlation between calculated global electrophilicity index ω values and experimental electrophilic reactivities was observed and discussed.

A New, Rapid, Colorimetric Chemodosimeter, 4-(Pyrrol-1-yl)pyridine, for Nitrite Detection in Aqueous Solution.

With increasing concerns over environmental impact and overall health of both the environment and its people, a need to quantify contaminants is of the utmost importance. Chemosensors with low detection limits and a relative ease of application can address this challenge. Nitrite ions are known to be detrimental to both the environment and human health. A new colorimetric chemodosimeter has been prepared from the homolytic photochemical cleavage of a reaction between pyrrole and pyridine. The product, 4-(pyrrol-1-yl)pyridine, yields a limit of detection of 0.330 (±0.09) ppm for the detection of nitrite in aqueous solution, employing a colorimetric change from yellow to pink. It is also highly selective for nitrite when various competitive anions such as SO3 2-, NO3 -, PO4 3-, SO4 -2, Cl-, F-, I-, Br-, AcO-, and CN- are present in great excess. The molecule's especially high sensitivity to nitrite is apparently the result of a complex supramolecular mechanism, characterized by both dynamic light scattering of the aggregate and the Tyndall effect. Consequently, this new sensor provides a simple, low-cost way to rapidly detect nitrite anions in aqueous solution.

A novel theranostic strategy for myocardial infarction through neutralization of endogenous SO2 using an endoplasmic reticulum-targeted fluorescent probe

Myocardial infarction (MI), one of the leading causes of death worldwide, urgently needs further understanding of the pathological process and effective therapies. SO2 in endoplasmic reticulum in several cardiovascular diseases has been reported to be particularly important. However, the role of endogenous SO2 in endoplasmic reticulum in treating myocardial infarction is still ambiguous and needs to be elucidated. Herein, we developed TPA-HI-SO2 as the first endoplasmic reticulum-targeting fluorescent agent for specific imaging and detection of sulfur dioxide derivatives both in vitro and in vivo. TPA-HI-SO2 shows a highly sensitive and selective response to SO2 derivatives over other anions in aqueous solution with a satisfactory response time and detection limit. Furthermore, TPA-HI-SO2 decreased the SO2 concentration in H9C2 cells treated with H2O2 and in an MI mouse model. Most importantly, TPA-HI-SO2 protects H9C2 cells from H2O2-induced apoptosis and obviously protects against myocardial infarction in vivo through neutralization of endogenous SO2. Taken together, we developed the first ER-targeting ratiometric fluorescent probe for endogenous SO2 with excellent biocompatibility, high selectivity and sensitivity in this paper. More importantly, we demonstrated an obvious increase of the endogenous SO2 concentration in a myocardial infarction mouse model for the first time, which suggests that neutralization of endogenous SO2 in endoplasmic reticulum could be a promising therapeutic strategy for myocardial infarction.

Porphyrin-based carbon dots as fluorescence probe for sensing of Fe3+ ion and S2- anion in aqueous solution

In this work, a facile bottom-up approach was employed to synthesize the porphyrin-citric acid-derived fluorescent carbon dots (Por-CA-CDs) using a single-step hydrothermal method. As-prepared Por-CA-CDs were well characterized using spectroscopic techniques such as FT-IR, high-resolution transmission electron microscopy, P-XRD, UV-Vis absorption, and photoluminescence spectroscopy. The synthesized Por-CA-CDs exhibited blue fluorescence with excellent photostability and diameter ranging from 2.4 to 6.4 nm. Por-CA-CDs show excitation-dependent emission behavior, with a quantum yield of 26% and were used for sensing of Fe3+ and S2− ions in an aqueous solution. Por-CA-CDs demonstrated a robust and selective reaction to Fe3+ compared to the other cations utilized in this investigation. The sensing capability of Por-CA-CDs with Fe3+ ions was evaluated with fluorescence spectroscopy, and results show a “Turn-Off” emission mode upon binding of Fe3+ with Por-CA-CDs. In metal ion sensing studies, the fluorescence intensity of Por-CA-CDs exhibited significant quenching upon the addition of Fe3+ at concentrations ranging from 0 to 230 μM, with a detection limit (LOD) of 3.2 × 10−8 M. The quenching efficiency and Stern-Volmer quenching constant were computed as 99.45% and 4.4 × 106 M−1, respectively. Interestingly, fluorescence of Por-CA-CDs can be regained with the addition of S2− (0-160 µM) with LOD of 4.3 × 10−6 M and Stern-Volmer quenching constant of 6 × 105 M−1. Most importantly, the toxicity assay revealed good reliability for samples in deionized, tap, and river water, suggesting applications for Fe3+ monitoring in complex environments.

Design and development of an azo dye‐based ultra‐sensitive chemosensor for the ubiquitous organic anion in aqueous solutions

AbstractOxalate plays a crucial role in various biological and industrial applications. Its involvement in diseases, drug‐ and toxin‐induced disorders, and disruption of industrial processes makes it a high‐priority chemical for the development of more precise, selective, and straightforward analytical methods. Herein, an innovative and efficient strategy for sequentially measuring Cu2+ and oxalate ions is reported. During an indicator displacement process, where Cu2+ and azo dye, ArsenazoIII (AAIII), are used as receiver and indicator, respectively, oxalate (C2O42−) is measured by a colorimetric method. Proof of concept results from UV–visible spectroscopy, naked eye, and signal reset of the indicator revealed a more robust interaction of the Cu2+ receptor with C2O42− than the AAIII indicator with high selectivity, good sensitivity, and lower detection limit(4.01 × 10−8 and 3.04 × 10−9mol L−1, for Cu2+ and C2O42−, respectively). The results of measuring C2O42− in actual samples (urine, mushrooms, and spinach) showed the applicability of the existing method. Most importantly, the colorimetric system based on molecular exchange in the indicator dislocation proceeding can serve as a colorimetric INHIBIT logic‐gate. It works like a molecular keypad lock system that can be controlled by two users with two different sets of chemical passwords (inputs) that can be identified through optical paths.

Elucidating Factors Contributing to Dicamba Volatilization by Characterizing Chemical Speciation in Dried Dicamba-Amine Residues.

Dicamba is a semivolatile herbicide that has caused widespread unintentional damage to vegetation due to its volatilization from genetically engineered dicamba-tolerant crops. Strategies to reduce dicamba volatilization rely on the use of formulations containing amines, which deprotonate dicamba to generate a nonvolatile anion in aqueous solution. Dicamba volatilization in the field is also expected to occur after aqueous spray droplets dry to produce a residue; however, dicamba speciation in this phase is poorly understood. We applied Fourier transform infrared (FTIR) spectroscopy to evaluate dicamba protonation state in dried dicamba-amine residues. We first demonstrated that commercially relevant amines such as diglycolamine (DGA) and n,n-bis(3-aminopropyl)methylamine (BAPMA) fully deprotonated dicamba when applied at an equimolar molar ratio, while dimethylamine (DMA) allowed neutral dicamba to remain detectable, which corresponded to greater dicamba volatilization. Expanding the amines tested, we determined that dicamba speciation in the residues was unrelated to solution-phase amine pKa, but instead was affected by other amine characteristics (i.e., number of hydrogen bonding sites) that also correlated with greater dicamba volatilization. Finally, we characterized dicamba-amine residues containing an additional component (i.e., the herbicide S-metolachlor registered for use alongside dicamba) to investigate dicamba speciation in a more complex chemical environment encountered in field applications.

Voltammetric Sensing of Chloride Based on a Redox-Active Complex: A Terpyridine-Co(II)-Dipyrromethene Functionalized Anion Receptor Deposited on a Gold Electrode.

A redox-active complex containing Co(II) connected to a terpyridine (TPY) and dipyrromethene functionalized anion receptor (DPM-AR) was created on a gold electrode surface. This host-guest supramolecular system based on a redox-active layer was used for voltammetric detection of chloride anions in aqueous solutions. The sensing mechanism was based on the changes in the redox activity of the complex observed upon binding of the anion to the receptor. The electron transfer coefficient (α) and electron transfer rate constant (k0) for the modified gold electrodes were calculated based on Cyclic Voltammetry (CV) experiments results. On the other hand, the sensing abilities were examined using Square Wave Voltammetry (SWV). More importantly, the anion receptor was selective to chloride, resulting in the highest change in Co(II) current intensity and allowing to distinguish chloride, sulfate and bromide. The proposed system displayed the highest sensitivity to Cl- with a limit of detection of 0.50 fM. The order of selectivity was: Cl- > SO42- > Br-, which was confirmed by the binding constants (K) and reaction coupling efficiencies (RCE).

Oxygen vacancies-rich Co3O4 cones loaded low content Pd for efficient and fast electrocatalytic hydrodechlorination

Pd-based materials have been considered to be the preferred electrocatalysts for electrocatalytic hydrodechlorination (EHDC) due to their excellent H* production capacity. However, the scarcity and high price of Pd restrict its use, thus, an efficient Pd-based EHDC electrocatalyst with low Pd content should be developed. In this work, oxygen vacancies-rich Co3O4 (Co3O4-OV) cone-like architecture growth in situ on Ni foam was used as an intermediate layer to synthesize Pd@Co3O4-OV/NF EHDC electrocatalyst with low Pd loading (0.0254 mg cm−2). Pd@Co3O4-OV/NF electrocatalyst can obviously promote the H* production and shows high EHDC activity with a dechlorination activity (DA) of 2.07 mmol2,4-DCP gPd−1 min−1 for EHDC of 2,4-dichlorophenol, which is higher than most reported Pd-modified electrodes. The Pd@Co3O4-OV/NF exhibited excellent anti-background interference ability (different initial pH and anions in aqueous solution) and good cycle stability (5 consecutive EHDC cycles), which could effectively improve aquatic biosafety.

Structure and size of complete hydration shells of metal ions and inorganic anions in aqueous solution.

The structures of nine hydrated metal ions in aqueous solution have been redetermined by large angle X-ray scattering to obtain experimental data of better quality than those reported 40-50 years ago. Accurate M-OI and M-(OI-H)⋯OII distances and M-OI(H)⋯OII bond angles are reported for the hydrated magnesium(II), aluminium(III), manganese(II), iron(II), iron(III), cobalt(II), nickel(II), copper(II) and zinc(II) ions; the subscripts I and II denote oxygen atoms in the first and second hydration sphere, respectively. Reported structures of hydrated metal ions in aqueous solution are summarized and evaluated with emphasis on a possible relationship between M-OI-OII bond angles and bonding character. Metal ions with high charge density have M-OI-OII bond angles close to 120°, indicative of a mainly electrostatic interaction with the oxygen atom in the water molecule in the first hydration shell. Metal ions forming bonds with a significant covalent contribution, as e.g. mercury(II) and tin(II), have M-OI-OII bond angles close to 109.5°. This implies that they bind to one of the free electron pairs in the water molecule. Comparison of M-O bond distances of hydrated metal ions in the solid state with one hydration shell, and in aqueous solution with in most cases at least two hydration shells, shows no significant differences. On the other hand, the X-O bond distance in hydrated oxoanions increases by ca. 0.02 Å in aqueous solution in comparison with the corresponding X-O distance in the solid state. A linear correlation is observed between volume, calculated from the van der Waals radius of the hydrated ion, and the ionic diffusion coefficient in aqueous solution. This correlation strongly indicates that monovalent metal ions, except lithium and silver(I), and singly-charged monovalent oxoanions have a single hydration shell. Divalent metal ions, bismuth(III) and the lanthanoid(III) and actinoid(III) ions have two hydration shells. Trivalent transition and tetravalent metal ions have two full hydration shells and portion of a third one. Doubly charged oxoanions have one well-defined hydration shell and an ill-defined second one.

Stability of Highly Soluble Ferrocyanides at Neutral pH for Energy Dense Flow Batteries

Ferro- and ferricyanides are among the most employed positive electrolyte materials in aqueous flow battery research but the limited solubility of commonly available sodium and potassium salts is a critical factor limiting application at scale. We systematically study the cation dependent solubility of these materials and, importantly, the cation dependent stability of the anion in aqueous solution. For Li4Fe(CN)6 we report a maximum solubility of 2.3 M and show stable cycling of a 2 M symmetric cell (54 Ah L−1) over 200 days, and also demonstrate solubilities of 1.6 M for ammonium and calcium salts. Importantly, we observe cation dependent electrolyte stability in long-term experiments and investigate the pronounced anion decomposition observed in presence of ammonium cations.[1] While achieving high solubilities leads to increased energy densities, concentrated electrolytes present many challenges such as high osmotic strength and high viscosity. This is particularly pronounced in electrolytes that employ ions with high charge states such as ferrocyanide. Furthermore, the selected cation needs to be compatible with the membrane in the cell.[2] We thus outline several often neglected design aspects that must be considered when developing new active materials for aqueous flow batteries. [1] Reber, D., Thurston, J.R., Becker, M., Marshak, M.P., Stability of highly soluble ferrocyanides at neutral pH for energy dense flow batteries, Cell. Rep. Phys. Sci. 2022, 4, 101215 [2] Waters, S.E., Thurston, J.R., Armstrong, R.W., Robb, B.H., Marshak, M.P., Reber, D., Holistic design principles for flow batteries: Cation dependent membrane resistance and active species solubility J. Power Sources 2022, 520, 230877

Simple excited state intramolecular proton transfer (ESIPT) based probe for pH and selective detection of copper(II) ion in aqueous alkaline environment: Sensitivity, selectivity and logic behavior

A low molecular weight ESIPT-based probe was synthesized and tested for detecting pH, cations, and anions in aqueous solutions. The probe exhibited a good emission in water due to aggregation induced by π-π* stacking. It gave an “off–on” fluorescent response to higher pHs because of blocking the non-radiative ESIPT after deprotonating phenolic hydroxyl groups. Moreover, the fluorescence emission of the probe (water/ethanol = 3:1, pH 10) was quenched only by Cu2+ with limit of detection LOD = 3.2 μM. The stoichiometric ratio of the probe/Cu2+ complex was found to be 1:1. Furthermore, changes of the probe’s absorption and emission signals (as outputs) in response to the presence of H+ and HO– or Cu2+ and Br− stimuli (as chemical inputs) mimics INHIBIT, IMPLICATION and NOT TRANSFER logic gates.

Pyrene-Based Cationic Fluorophores with High Affinity for BF4-, PF6-, and ClO4- Anions: Detection and Removal.

Anions play an indispensable role in the balance and regulation of the ecological environment and human health; however, excess anions can cause serious ecological and environment problems. Therefore, the detection and removal of excess anions in aqueous solution is not only a technological problem but also crucial for environmental protection. Herein, a set of water-soluble pyrene-based cationic fluorophores were synthesized, which exhibit high sensitivity for the detection of the anions BF4-, PF6-, and ClO4- via electrostatic interactions. Such fluorescent probes exhibit "turn-on" emission characteristics even at low concentrations of anions due to anion-π+ interactions. Moreover, these fluorescence probes act as efficient precipitating agents for the removal of the BF4-, PF6-, and ClO4- anions from an aqueous environment. This work opens up new avenues for future research on pyrene-based fluorophores as turn-on fluorescence probes for anion detection and as excellent precipitating agents in environmental settings.

A sensitive single-layered graphene oxide-based sensor for electrochemical sensing of phosphate anion

In recent years, the electrochemical determination of phosphate anion in aqueous solution has attracted widespread interest because of its potential to address the environmental, economic and health concerns associated with phosphate management protocol. Herein, we report a direct electrochemical approach to identify phosphates using a special architecture of single-layered graphene oxide (SLGO) with abundant oxygen-containing surface functional groups. The electrochemical adsorption of phosphate onto SLGO was confirmed by X-ray photoelectron spectroscopy (XPS), and the formation of covalent bonds between phosphorus and carbon atoms occurred through the partial conversion of C-O covalent bonds to C-O semi-ionic bonds, which was beneficial to the electrochemical performances of phosphate at SLGO. The electrochemical adsorption of phosphates at other carbon nanomaterials modified glassy carbon electrodes (GCE) and bare GCE was also carried out. Further characterization by XPS, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) revealed the electrochemical mechanism of SLGO/GCE toward phosphates. Under the optimized conditions, the concentration of phosphate was linearly related to the peak current in the range of 10.0–100.0 μM with limit of detection (LOD) of 2.0 μM (S/N = 3). More importantly, SLGO/GCE could be further extended to the quantitative detection of phosphate in industrial wastewater and human serum with acceptable recoveries (95.09–103.48%). This research could provide an effective method for the detection of trace phosphates in environmental media as well as physiological media.

A new avibactam Gemini quaternary ammonium salt: synthesis, self-assembly, vibrational spectra, crystal structures and DFT calculations

Avibactam ([AV]), a non-β-lactam β-lactamase inhibitor, contains a sulfonic acid group, which making separation and purification extremely difficult. The ability of the gemini quaternary ammonium salt N,N,N,N’,N’,N’-hexabutylbutanediammonium dibromide [444][Br]2 to precipitate [AV] from aqueous solutions resulted in the successful synthesis of a new avibactam gemini quaternary ammonium salt [444][AV]2. To understand the self-assembly, the transmission electron microscope (TEM) and spectra of [444] cations and [AV] anions in aqueous solution were investigated. By using a slow evaporation technique, the [444][AV]2 complex single crystal was produced from a water solvent. The title crystal structure conformation was done by single crystal X-ray diffraction (SCXRD) technique, and its belongs to the P-1 space group with the triclinic system. The thermal stability of [444][AV]2 has been investigated by TG/DSC studies, and its experimental vibrational bands (FT-IR and Raman) have been studied and assigned. The stability test indicated that [444][AV]2 exhibits outstanding physical stability under long-term and accelerated conditions. According to DFT calculations, electrostatic potential and Mulliken charges showed that [444] cations were readily adsorbed on the negatively charged [AV] anions surface sites through electrostatic attraction, and the existence of inter-molecular interactions was assessed by Hirshfeld surface of [444][AV]2 single crystal.

Design of a Portable and Reliable Fluorimeter with High Sensitivity for Molecule Trace Analysis

There is a growing need for portable, highly sensitive measuring equipment to analyze samples in situ and in real time. For these reasons, it is becoming increasingly important to research new experimental equipment to carry out this work with advanced, robust and low-cost devices. In this framework, a flexible, portable and low-cost fluorimeter (under EUR 500), based on a C12880 MA MEMS micro-spectrometer with an Arduino compatible breakout board, has been developed for the trace analysis of biological substances. The proposed system can employ two selectable excitation sources for flexibility, one in the visible region at 405 nm (incorporated in the board) and an external LED at 365 nm in the UV region. This additional excitation source can be easily interchanged, varying the LED type for investigating any fluorophore compound of interest. The measurement process is micro-controlled, which allows the precise control of the spectrometer sensitivity by adjusting the integration time of each experiment separately. Data acquisition is easy, reliable and interfaced with a spreadsheet for fast spectra visualization and calculations. For testing the performance of the new device in fluorescence measurements, different fluorophore molecules which can be commonly found in biological samples, such as Fluorescein, Riboflavin, Quinine, Rhodamine b and Ru (II)-bipyridyl, have been employed. A high sensitivity and low quantitation limits (in the ppb range) have been found in all cases for the investigated chemicals. The portable device is also suitable for the study of other interesting phenomena, such as fluorescence quenching induced by chemical agents (such as halide anions or even auto-quenching). In this sense, an application for the quantification of chloride anions in aqueous solutions has been performed obtaining a LOD value of 18 ppm. The obtained results for all chemicals investigated with the proposed fluorimeter are always very similar in quantification figures, or even better than the data reported in literature, when using commercial laboratory equipment.

Synthesis and characterization of Cu2O@Cu/Al-CLDH for efficient adsorption of iodide anions in aqueous solutions

Synthesis and characterization of Cu2O@Cu/Al-CLDH for efficient adsorption of iodide anions in aqueous solutions

Voltammetric determination of phosphates using ion-selective electrode based on organotin ionophore

This work describes the development of an amperometric phosphate-selective electrode with a plasticized membrane that includes bis(2-ethylhexyl)tin (IV) dichloride as an ionophore. The potentiometric response of the plasticized membrane was investigated, in addition to its selectivity for hydrophilic anions. The membrane provided a linear potential response with respect to HPO42- ions in the concentration range from 4·10-5 to 3·10-2 mol/L with a Nernst slope of 29 ± 2 mV·decade-1 activity. By using cyclic voltammetry, we characterized the ionophore-facilitated transfer of mono- and dihydro phosphate ions at the water/PVC-2-nitrophenyl octyl ether phase interface. An interphase distribution coefficient, a galvanic potential, a half-wave potential, the Gibbs energy of facilitated interphase transfer, as well as the Gibbs energy of facilitated interphase transfer were determined. Alternating current voltammetry was used to quantify phosphate ions in aqueous solutions. The linear response was observed in the range of phosphate concentrations from 2 to 10-6 to 1·10-4 mol/L and the detection limit was 8·10-7 mol/L under these conditions. This AISE has demonstrated high selectivity for phosphate ions in comparison to the most common anions in aqueous solutions. It has been used to determine the amount of phosphates in two fertilizers.

Two unique 2D metal-organic frameworks based on various metal-oxygen chains for high sensitivity sensing of Fe(III) and Cr(VI) in aqueous media

Two new 2D MOFs, namely, {[Cd2(HL)(H2O)(DMF)2]·(H2O)·(DMF)}n (1), {[Co2(HL)(H2O)(DMF)2]·(H2O)·(DMF)}n (2) were constructed under the solvothermal conditions by using 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid and d10 metal ion Cd(Ⅱ) and Co(Ⅱ). Because the diversity of ligands leads to two different coordination patterns in complexes 1–2, resulting in 1 and 2 with multiple structures. Both 1 and 2 exhibit a 3D supramolecular framework, which based on different metal-oxygen chains. The chains form a 2D layered structure through the carboxyl oxygen atoms in the ligand. The solid-state luminescence spectra of 1 at room temperature showed that the maximum emission peak is 458 nm (λex = 346 nm). At the same time, 1 showed high fluorescence selectivity and low detection limit for Fe3+ cations, Cr2O72− and CrO42− anions in aqueous solution, and can be used as a potential multifunctional material for the detection of these substances. In addition, the fluorescence sensing properties and quenching mechanism of the above ions are discussed in detail.