H2O Solvent System Research Articles

Green synthesis of cobalt oxide nanoparticles (Co3O4NPs): Characterization and green light-driven photocatalytic aerobic oxidation of alkyl and aryl sulfides to the corresponding sulfoxides

In recent years, cobalt oxide nanoparticles (Co3O4NPs) have garnered significant attention due to their unique properties and wide range of applications, particularly in catalysis and environmental remediation. This study focuses on the green synthesis of Co3O4NPs using garlic extract as a bio-reducing and stabilizing agent, marking the first instance of employing this eco-friendly and cost-effective method. The synthesized nanoparticles were characterized using various techniques including SEM, EDX, FTIR, XRD, UV–Vis DRS, and BET analysis, revealing their spherical morphology, elemental composition, surface area, and optical properties. The primary application investigated was the photocatalytic aerobic oxidation of alkyl and aryl sulfides to sulfoxides under visible green light irradiation. The study meticulously optimized the reaction conditions, evaluating the effects of different solvents, light sources, and catalyst dosages. The optimal conditions were found to be a MeCN:H2O (5:1) solvent system, green LED light (535 nm), and 10 mg of Co3O4NPs catalyst with the highest TON of 12.5. Under these conditions, the catalyst demonstrated high efficiency, achieving up to 95% yield of sulfoxides with various substrates. Furthermore, the reusability of the Co3O4NPs was assessed through multiple catalytic cycles, showing excellent stability and consistent performance. Mechanistic studies indicated that the photocatalytic activity involves the generation of reactive oxygen species (ROS) such as superoxide anion radicals (O2.-) and singlet oxygen (1O2), with both holes and electrons playing crucial roles in the oxidation process. This research highlights the potential of green synthesized Co3O4NPs as effective and sustainable photocatalysts for selective oxidation reactions, offering a promising approach for environmentally benign chemical processes. The findings pave the way for further exploration of bio-derived catalysts in various industrial applications, promoting greener and more sustainable practices in chemical synthesis.

Development of a triazole-linked bis-organosilane compound as dual-function agent: Sensing of Al3+ ion in aqueous environments and inhibition of HIV-1 protease

The increasing applications of aluminum metal have led to rising concerns regarding its adverse environmental impacts, particularly on marine life and human health, necessitating its efficient detection. Bis-organosilane compounds hold a pivotal position in organosilicon chemistry, contributing significantly to industrial processes and scientific research. In this study, a synthesized bis-1,2,3-triazole-linked bis-organosilane was employed as a sensor for the selective detection of Al³⁺ ions in a MeOH: H₂O (7:3, v/v) solvent system. This sensor demonstrated high selectivity and strong anti-interference capabilities, even in the presence of other metal ions. The detection limit for Al³⁺ was found to be significantly lower than the WHO-prescribed limits for drinking water. Using an actual water sample analysis experiment, its practical utility was also investigated. Additionally, bis-organosilane (6) capability as an antioxidant to stabilize free radicals was also tested. Given the biological significance of triazoles, compound (6) was evaluated for its inhibitory activity against HIV-1 protease using molecular docking tools. the current study emphasizes bis-organosilane (6) as an Al3+ sensor with dual activity as a possible HIV medication and a significant antioxidant.

A thiazole-based colorimetric and photoluminescent chemosensors for As3+ ions detection: Density functional theory, test strips, real samples, and bioimaging applications

A Schiff-base Ethyl (E)-2-(3-((2-carbamothioylhydrazono)methyl)-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate (TZTS) dual functional colorimetric and photoluminescent chemosensor which includes thiazole and thiosemicarbazide has been synthesized to detect arsenic (As3+) ions selectively in DMSO: H2O (7:3, v/v) solvent system. The molecular structure of the probe was characterized via FT-IR, 1H, and 13C NMR & HRMS analysis. Interestingly, the probe exhibits a remarkable and specific colorimetric and photoluminescence response to As3+ ions when exposed to various metal cations. The absorption spectral changes of TZTS were observed upon the addition of As3+ ions, with a naked eye detectable color change from colorless to yellow color. Additionally, the chemosensor (TZTS) exhibited a new absorption band at 412 nm and emission enhancements in photoluminescence at 528 nm after adding As3+ ions. The limit of detection (LOD) for As3+ ions was calculated to be 16.5 and 7.19 × 10−9 M by the UV–visible and photoluminescent titration methods, respectively. The underlying mechanism and experimental observations have been comprehensively elucidated through techniques such as Job’s plot, Benesi-Hildebrand studies, and density functional theory (DFT) calculations. For practical application, the efficient determination of As3+ ions were accomplished using a spike and recovery approach applied to real water samples. In addition, the developed probe was successfully employed in test strip applications, allowing for the naked-eye detection of arsenic ions. Moreover, fluorescence imaging experiments of As3+ ions in the breast cancer cell line (MCF-7) demonstrated their practical applications in biological systems. Consequently, these findings highlight the significant potential of the TZTS sensor for detecting As3+ ions in environmental analysis systems.

The Emerging Role of Polyethylene Glycol-Water (PEG-H2O) as the Benign Mixed Solvent System in Organic Synthesis

Abstract: Polyethylene glycol (PEG) has become a popular solvent and green catalyst for a variety of chemical reactions. It is a stable and biodegradable polymeric catalyst used in organic synthesis because it may be recycled numerous times without significantly losing its catalytic activity. Recently, the use of PEG-H2O mixed solvent systems in organic synthesis has gained popularity. This article presents an overview of PEG-H2O solvent system-mediated organic reactions, with a main focus on the importance of the solvent system. The study also focuses on recent developments in the PEG-H2O solvent system-mediated synthesis of a number of heterocy-clic compounds. Important characteristics of these PEG-H2O solvent systems include high atom economies, gentle reaction conditions, faster reaction rates, readily isolated side products and high yields. Results from various reactions showed that the choice of proper ratio of PEG: H2O solvent system plays a key role in product yields.

Hydrophilic Ti-MWW for catalyzing epoxidation of allyl alcohol

Titanosilicates are widely applied in the alkene epoxidation reactions with high reaction rate and selectivity to desired products. Their catalytic performance depends on the structure topology, the micro-environment of Ti active sites, and the hydrophobicity/hydrophilicity of zeolite framework. Herein, we focus on a hydrophilic substrate of allyl alcohol (AAL) and investigated catalytic performance of four titanosilicates (TS-1, Ti-MOR, Ti-MWW, and Re-Ti-MWW) in the AAL epoxidation reaction with hydrogen peroxide as the oxidant. Among them, Re-Ti-MWW, synthesized via the post-modification of Ti-MWW with piperidine, exhibited the highest activity. Moreover, the preferred solvent changed from MeCN for Ti-MWW to H2O for Re-Ti-MWW. The relative diffusion rate of AAL over Re-Ti-MWW was up to 466 × 10-7 s-1, much larger than those of other zeolites. The higher diffusion rate of Re-Ti-MWW was probably derived from the higher framework hydrophilicity as revealed by the smaller water contact angle of Re-Ti-MWW compared to the other zeolites, which contributed to the high activity in AAL epoxidation. In the continuous slurry reactor, Re-Ti-MWW achieved a high catalytic lifetime of 163 h, with the selectivity of desirable glycidol product maintained at > 97% in the H2O solvent system, showing high potential as an industrial catalyst for the AAL epoxidation reaction.

Integrated process towards sustainable renewable plastics: Production of 2,5-furandicarboxylic acid from fructose in a base-free environment

We report an integrated approach to produce 2,5-furandicarboxylic acid (FDCA) using fructose as a feedstock in a base-free environment, thus providing a promising alternative to the current protocol. FDCA, an alternative molecule to terephthalic acid (obtained from the petroleum route), is used to synthesize poly(ethylene-2,5-furanoate) (PEF), a renewable plastic. In our approach, we produced 5-hydroxymethylfurfural (HMF; 84% yield) by fructose dehydration in an acetone (Ace)/H2O solvent system. The obtained HMF feed was subsequently oxidized over Ru/MnO2, producing FDCA in 92% yield under base-free conditions. The Ru/MnO2 catalyst outperformed conventional Pt/C and Ru/C catalysts under identical reaction conditions. Our novel approach for FDCA production via an integrated process using an Ace/H2O solvent mixture under base-free conditions is economically feasible and environmentally friendly. To the best of our knowledge, this work is the first to report the production of FDCA via this route. We postulate that the high catalytic efficiency of the sulfonated porous organic polymer and Ru/MnO2 in an Ace/H2O system renders them superior to existing homogeneous catalytic routes for HMF production and conversion into FDCA via a scalable process.

A Highly Sensitive and Selective Quinazoline-Based Colorimetric Probe for Naked-Eye Detection of Fe3+ Ions.

A novel quinazoline-based colorimetric sensor (probe 1) that detected Fe3+ via naked-eye in a buffered MeOH: H2O (8:2) solvent system within a neutral pH range was synthesized and its structure was confirmed by 1H-NMR, 13C-NMR, FT-IR, and Mass spectroscopy. Its photophysical properties were also studied. The sensitivity and selectivity factor in the presence of 16 metal ions was examined by utilizing absorption titrations. Based on the selectivity test, probe 1 exhibited excellent selectivity and sensitivity toward Fe3+ ions among various other ions. The competitive effect indicated relatively low interference of other cations on the interaction of probe 1/Fe3+. To specify the sensing behavior of probe 1 to Fe 3+, the mole ratio method was carried out. After addition of around 500 µL of Fe3+, the absorption of probe1 reached saturation, and the reaction was completed. The effect of pH on the absorption and stability of probe 1 towards Fe3+ was examined. The pH range from 5.0 to 9.0 was appropriate for detection of Fe3+. To find the binding stoichiometric of the complex, Job's plot studies were carried out by varying the molar ratio of Fe3+. A 1:2 binding ratio was proposed. Under the optimal conditions, a good linear relationship (R2 = 0.9886) was at the concentration of Fe3+ over the range of 50-110µM, with a detection limit of 47.44nM. Our quinazoline-based probe has shown good results for the quantitative determination of Fe3+ in samples of urine with high recovery.

Phenanthridine-based fluorescence sensor for the “off-on” determination of thorium ion and its bio-imaging applications

A new Intramolecular charge transfer (ICT) based fluorescent sensor for recognizing Th4+ ions has been successfully designed and developed. Sensor probe of 2-methyl-4-(4-(7,8,13,14-tetrahydrodibenzo[a,i]phenanthridin-5-yl)phenyl)but-3-yn-2-ol (1a) and 5-(4-ethynylphenyl)-7,8,13,14-tetrahydrodibenzo[a,i]phenanthridine (1b) selectively determined Th4+ ion with an instant color change from colorless to blue in CH3CN:H2O (9:1) solvent system. The detection limit (1a: 3.4 × 10−8 M and 1b: 1.4 × 10−8 M) for Th4+ ion was below the U.S Environmental Protection Agency's (EPA) permissible level in drinking water. In addition, 1a was applied to quantify thorium ions in natural water samples. The present sensor probe could detect thorium ions in biological cells using fluorescence bio-imaging with different emission channels. The detailed sensing mechanisms of 1a and 1b for Th4+ ion have been investigated from NMR titrations, FTIR, Electrospray ionization (ESI)-Mass, and theoretical calculation techniques.

2-((E)-1-((E)-(2-methoxybenzylidene)hydrazono)ethyl)phenol based cost-effective sensor for the selective detection of Eu3+ ions

The detection of lanthanides has emerged as an attractive field of research due to potential applications in biomedical sciences. Here we design a simple and cost-effective ligand 2-((E)-1-((E)-(2-methoxybenzylidene)hydrazono)ethyl)phenol (MHEP) that acts as a rapid selective sensor for Eu3+ ions with a blue shift in UV–visible, ratiometric enhancement in fluorescence intensity and significant redox potential changes in cyclic voltammetric graph among various metal ions in the CH3OH:H2O (1:1, v/v) solvent system. The UV–visible titrations are used to determine the limit of detection 1.2 × 10−7 M, the limit of quantitation 41 × 10−7 M and linear range 22 × 10−6 M−1 to 124 × 10−6 M−1 are determined. The binding stoichiometry is determined by Job’s plot, mole ratio method and Benesi-Hildebrand plot that is found 1:1 (MHEP:Eu3+) with association constant 2.360 × 105 M−1. The IR spectroscopy reveals the role of imine functionalities for the Eu3+ ions detection.

Preparative separation of six compounds from Salvia yunnanensis Radix using pH-zone-refining counter-current chromatography.

Phenolic acids are the main active components in Salvia yunnanensis Radix, which have significant effects such as cardiovascular protection, anti-thrombosis, anti-oxidant, and anti-inflammation. In this study, pH-zone-refining counter-current chromatography (pH-ZRCCC) was successfully applied to the preparative separation of phenolic acids from S. yunnanensis Radix. First, a two-phase solvent system composed of Pet-EtOAc-ACN-H2 O (1.5:2.5:1:5, v/v) [TFA (10 mM) was added in the upper phase and NH3 ·H2 O (30 mM) was added in the lower phase] was used for the separation of 4.0 g of the crude sample to obtain 55.6 mg of rosmarinic acid (1), 69.0 mg of caffeic acid (2), 18.9 mg of protocatechualdehyde (3), 14.6 mg of 8-epiblechnic acid 9-methyl ester (4), and a mixture containing two compounds. After the recovery, 1.3 g of the mixture was obtained and separated using the MtBE-H2 O (1:1, v/v) solvent system containing TFA (5 mM) and NH3 ·H2 O (60 mM) to obtain 259.9 mg of salvianolic acid B (5) and 28.75 mg of lithospermic acid (6). Moreover, a systematic separation pattern for separating the relatively low-polarity phenolic acids from natural products by pH-ZRCCC was summarized for the first time. This study provided technical support for the pharmacological activity and quality control research of S. yunnanensis Radix.

Improving enzymatic saccharification of Chinese silvergrass by FeCl3-catalyzed γ-valerolactone/water pretreatment system

In this work, we report that FeCl3, a benign Lewis acid, could be used as a catalyst in the γ-valerolactone (GVL)/H2O solvent system to facilitate efficient pretreatment of Chinese silvergrass. The results showed that approximately 87.8% of xylan and 75.8% of lignin were removed by 80% GVL under 170 °C using 50 mM FeCl3 as a catalyst. The solubilized carbohydrate fractions in the pretreatment liquor were mainly composed of monosaccharides (glucose and xylose) rather than oligosaccharides (glucose oligomers and xylose oligomers) and inhibitors (furfural, hydroxymethylfurfural, formic acid and acetic acid). Moreover, FeCl3 decreased the transesterification of GVL with hydroxyl groups on the cellulose surface and resulted in more easily degraded cellulose. Approximately 96.5% of cellulose and 92.2% of xylan in the pretreated Chinese silvergrass were converted to fermentable monosaccharides by 10 FPU/g cellulases. This study indicated that FeCl3-catalyzed GVL solvent could efficiently deconstruct biomass and increase the cellulose digestibility, which provided a novel, GVL-based pretreatment system for processing biomass.

Colorimetric and fluorescent multi-ion recognition by Anthracene appended di-Schiff base chemosensor

A new di-Schiff base colorimetric sensor, 4-(Anthracen-9-ylmethylene-hydrazonomethyl)-benzene-1,3-diol (coded as AHB), possessing anthracene and 2,4-dihydroxybenzaldehyde as fluorophore and receptor, respectively, has been reported. The sensor AHB is capable of naked eye detection of Hg2+ ions and detection of Cu2+ and Al3+ ions via two different fluorescence mechanisms in HEPES buffered CH3OH: H2O (9: 1) solvent system. The sensor witnessed high selectivity towards all the three ions in the presence of various other metal ions. The quantitative detection limit of Hg2+ ions was calculated to be 2 μM; while it was 2.07 and 1.29 μM for Cu2+ and Al3+ ions, respectively.

Solvent assisted reactive dyeing of cotton with high exhaustion in the absence of salt

Conventional reactive dyeing generates colored effluents with large amounts of salt. Herein, an ethanol (EtOH)-carbon tetrachloride (CCl4)-water (H2O) solvent-assisted dyeing system was proposed for the reactive dyeing of cotton. In detail, cotton yarns were firstly pretreated with alkali solution, followed by dyeing in a 55:40:5 (v/v) EtOH–CCl4–H2O solvent system without the addition of salt. To validate the developed salt-free dyeing approach, six kinds of representative reactive dyes were selected for the experiments according to their color hues and reactive groups. The effects of dyeing temperature and time on the exhaustion and total fixation of the investigated reactive dyes were studied. The influences of the EtOH–CCl4–H2O solvent system on the morphology, particle size, zeta potential, contact angle, and penetration time of the dye solutions were also determined to elucidate the dyeing mechanism detailly. Compared with the samples dyed with conventional method, the cotton yarns dyed in the EtOH–CCl4–H2O solvent system exhibited significantly higher K/S values, exhaustion, and total fixation. More importantly, the excellent permeability, satisfactory colorfastness, and acceptable color uniformity were also achieved on the samples dyed in the EtOH–CCl4–H2O solvent system. Despite that the developed salt-free dyeing method may consume slightly higher material costs, it can significantly reduce chemicals consumption and wastewater discharge. Therefore, this dyeing method can be a promising approach for the cleaner production of cotton. Future studies in this direction will mainly focus on its industrial applications and the reuse of solvents.

Effect of Extraction Conditions on the Phenolic Content and DPPH Radical Scavenging Activity of Hypericum perforatum L.

In this study, various extracts of Hypericum perforatum L. were investigated in terms of their extraction yields. For this purpose, five solvent systems including 70%EtOH-30% H2O (A), 50%EtOH-50% H2O (B), 30%EtOH-70% H2O (C), 100% EtOH (D), and 100% H2O (E) were used. Ultrasonic-assisted extraction was used for extraction and extraction processes were performed at different temperatures (30°-70oC) and extraction times (30-70 min.). The optimum extraction conditions for H. perforatum was determined based on extraction yield, total phenolic contents, and DPPH radical scavenging activities of the crude extracts, as well. The best ultrasound extraction conditions are achieved in the presence of 70%EtOH-30% H2O solvent system, for 40 min, at 30°C for H. perforatum.

A novel, anthracene-based naked eye probe for detecting Hg2+ ions in aqueous as well as solid state media

A novel di-Schiff base colorimetric sensor, 2-((E)-(((E)-anthracen-9-ylmethylene)hydrazineylidene)methyl)quinolin-8-ol (coded as AQ), connecting anthracene and 8-hydroxyquinaldehyde functionalities is developed for the naked eye detection of Hg2+ ions in HEPES buffered CH3OH: H2O (7: 3) solvent system within neutral pH range. The sensor witnessed high selectivity towards Hg2+ ions in the presence of various other metal ions with naked eye colour change from yellow to pink. The quantitative detection limit of 220 nM was achieved through UV–Vis spectroscopy. The change in the intramolecular charge transfer behaviour of AQ has been proposed to be responsible for the observed absorption as well as colour change as evident from 1H NMR titration, FT-IR studies and DFT calculations. Moreover, the probe AQ has been efficiently applied for the solid state naked eye detection of Hg2+ ions in the form of filter paper strips and solid silica gel (60–120 mesh), pre-impregnated with AQ, and for the detection of Hg2+ ions in real water samples.

Wearable, Antifreezing, and Healable Epidermal Sensor Assembled from Long-Lasting Moist Conductive Nanocomposite Organohydrogel.

Flexible wearable soft epidermal sensors assembled from conductive hydrogels have recently attracted tremendous research attention because of their extensive and significant applications in body-attachable healthcare monitoring, ultrasensitive electronic skins, and personal healthcare diagnosis. However, traditional conductive hydrogels inevitably face the challenge of long-term usage under room temperature and cold conditions, due to the lost water, elasticity, and conductivity at room temperature, and freezing at the water icing temperatures. It severely limits the applications in flexible electronics at room temperature or cold environment. Herein, we report a flexible, wearable, antifreezing, and healable epidermal sensor assembled from an antifreezing, long-lasting moist, and conductive organohydrogel. The nanocomposite organohydrogel is prepared from the conformal coating of functionalized reduced graphene oxide network by the hydrogel polymer networks consisting of poly(vinyl alcohol), phenylboronic acid grafted alginate, and polyacrylamide in the binary ethylene glycol (EG)/H2O solvent system. The obtained organohydrogel exhibits excellent temperature tolerance (-40 °C), long-lasting moisture (20 days), reliable self-healing ability, and can be assembled as wearable sensor for an accurate detection of both large and tiny human activities under extreme environment. Thus, it paves the way for the design of highly sensitive wearable epidermal sensors with reliable long-lasting moisture and excellent temperature tolerance for potential versatile applications in electronic skins, wearable healthcare monitoring, and human-machine interaction.

Selective optical detection of HSO4− via hydrolysis of a simple Schiff Base

A very simple Schiff Base derived from 1-Naphthylamine and 4-(Trifluoromethy) benzaldehyde (L) was prepared as a selective colorimetric and turn-on fluorescent sensor for hydrogen sulfate. In the CH3CN:H2O (3:2, v/v) solvent system, L shows a highly selective colorimetric response to HSO4− ions by changing its color from yellow to colorless immediately. In addition, the weakly fluorescent receptor L shows a highly selective enhancement of fluorescence intensity at 425 nm for HSO4− upon excitation at 320 nm. The recognition process is proven to be hardly influenced by the other tested competitive anions. The sensing is suggested to involve a hydrolysis process promoted by HSO4− which has been further supported by UV–Vis, 1H NMR and HRMS spectroscopic studies. Applicability of L to detect HSO4− in tap water has been demonstrated. An easy-to-prepare test strip of L has also been made for the naked-eye detection of HSO4− in real samples.

Microporous assembly and shape control of a new Zn metal–organic framework: Morphology‐dependent catalytic performance

A new metal–organic framework (MOF), [Zn(ATA)(bpd)]∝ (1Zn) (ATA: 2‐aminoterephthalic acid; bpd: 1,4‐bis(4‐pyridyl)‐2,3‐diaza‐1,3‐butadiene), exhibiting a three‐dimensional extended porous structure was successfully assembled in a MeOH–H2O solvent system. Under various controlled conditions, 1Zn was obtained in a variety of morphologies such as microspheres, microblocks, microsheets, microplates and microrods. The catalytic performance of the 1Zn microsized MOF was evaluated, and a possible catalytic mechanism was proposed. The flexibility of this MOF assembly strategy for shape control will certainly enhance new potential applications of micro−/nano−MOFs.

Effect of water of crystallization on the dissolution efficiency of molten zinc chloride hydrate salts during the pre‐treatment of corncob biomass

AbstractBACKGROUNDAgro‐wastes albeit abundant and cheap, require pre‐treatment steps tailored to overcome the characteristic recalcitrance of lignocellulosic biomass. In this study, zinc chloride hydrate salts were studied for their biomass deconstruction potential. The role of salts' hydration and to what degree it affects the dissolution efficiency was evaluated. Milled corn cobs from local farmlands were dissolved in the following solvent systems; ZnCl2.3H2O, ZnCl2 .4H2O, ZnCl2 .5H2O and ZnCl2 .7H2O at 70 °C for 60 mins at a biomass to solvent ratio of 1:12.RESULTSThe difference between the least and most hydrated solvent systems in terms of total released sugars as a percentage of recoverable sugar is 70.1%. The ZnCl2.4H2O solvent system extracted up to 49.1% of glucose and 95% of xylose. There were significant differences in the crystallinity indices and surface morphologies between the untreated and treated biomass.CONCLUSIONThe findings as documented contribute to current insights on the mechanisms of disintegration of lignocellulosic biomass in molten hydrate salts. The extraction of sugar components of biomass by ZnCl2.4H2O solvation was about 43% glucan and 99% xylan. © 2017 Society of Chemical Industry

Selective catalytic properties determined by the molecular skeleton: Two new isostructural coordination polymers[{M(H2O)5}2(μ-4-bpdh)(oba)]∞ (M = Co, Ni)

Two new isostructural metal–organic coordination polymers [{M(H2O)5}2(μ-4-bpdh)(oba)]∞ (M=Co, Ni), 1Co and 2Ni, respectively, were constructed from 4-bpdh (2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) and oba (4,4′-oxybis(benzoic acid)) in a MeOH–H2O solvent system. The Co (Ni) ion was located in a hexa-coordinate environment surrounded by five aqua ligands and one 4-bpdh ligand, which bridged two metal centers to form a rod-like structure. Both the Co and Ni coordination polymers can catalyze methyl orange (MO) and malachite green (MG), showing that the unique molecular skeleton determines their properties. Interestingly, different central metal ions of 1Co and 2Ni result in the difference of degradation efficiency. Furthermore, microcrystals of 1Co (2Ni) with different sizes and morphologies were obtained under various conditions. Additionally, a detailed oxidation catalytic mechanism of MO and MG was proposed. These two highly active coordination polymers that are able to selectively degrade organic dyes will be useful in many practical applications.