Addition Of NaClO Research Articles

Optimizing addition of NaClO in TEMPO-mediated oxidation of cellulose for less nanofiber degradation

Optimizing addition of NaClO in TEMPO-mediated oxidation of cellulose for less nanofiber degradation

Effect of sodium hypochlorite as a depressant for copper species in Cu-Mo flotation separation

One alternative to replace conventional depressants in Cu-Mo separation is using oxidizing agents to promote the formation of products on chalcopyrite that render its surface hydrophilic and thus favor its depression. This work provides a study to understand how sodium hypochlorite can act as a depressor for chalcopyrite in Cu-Mo flotation separation. The effect of NaClO in flotation tests was evaluated by means of electrochemical techniques, scanning electron microscopy (SEM), Fourier transform infrared analysis and contact angle measurements. The flotation results showed a selective depressant effect at a dosage of 1,020 g/t NaClO, conditioning time of 5 min, and pH 7. The mixed potential showed that the oxidation of chalcopyrite and molybdenite is possible through the addition of NaClO. The SEM observations showed changes in oxidized chalcopyrite morphology, which is supported by the decreasing contact angle change; no morphological changes were observed on molybdenite. FTIR analyses showed the characteristic peaks of the OH group after chalcopyrite was treated with NaClO; when molybdenite was treated with NaClO, the FTIR spectrum did not show changes. A scheme is proposed for the formation of oxidation species.

Applying lysozyme, alkaline protease, and sodium hypochlorite to reduce bioclogging during managed aquifer recharge: A laboratory study

Alleviating bacterial-induced clogging is of great importance to improve the efficiency of managed aquifer recharge (MAR). Enzymes (lysozyme and alkaline protease) and sodium hypochlorite (NaClO) are common biological and chemical reagents for inhibiting bacterial growth and activity. To investigate the applicability of these reagents to reduce bioclogging, percolation experiments were performed to simulate a weak alkaline recharge water infiltration through laboratory-scale sand columns, with adding 10 mg/L lysozyme, alkaline protease, and NaClO, respectively. The results showed that, with the addition of lysozyme, alkaline protease, and NaClO, the average clogging rates (the reduced percentages of relative saturated hydraulic conductivity of the sand columns per hour during the percolation experiments) were 0.53%/h, 0.32%/h and 0.06%/h, respectively, which were much lower than that in the control group (0.99%/h). This implied that bioclogging could be alleviated to some extent following the treatments. For further analyzing the mechanisms of the regents on alleviating bioclogging, the bacterial cell amount and extracellular polymeric substances (EPS) concentration were also measured to study the effects of lysozyme, alkaline protease, and NaClO on bacterial growth and EPS secretion. Lysozyme and alkaline protease could disintegrate bacterial EPS by hydrolyzing polysaccharides and proteins, respectively, while they had little effect on the bacterial cell amount. The addition of NaClO significantly decreased the bacterial cell amount (P < 0.05) and thus greatly alleviated bioclogging. Although the lowest average clogging rate was achieved in the NaClO group, it can generate disinfection by-products that are potentially harmful to the environment and human health. Therefore, the biological-based method, i.e., enzyme treatment, could be a promising option for bioclogging control. Our results provide insights for understanding the mechanisms of lysozyme, alkaline protease, and NaClO to alleviate bioclogging, which is of great importance for addressing the clogging problem during MAR activities and achieving groundwater resources sustainable utilization.

Investigation on series-wound orifice plate hydrodynamic cavitation (HC) degradation of Rhodamine B (RhB) assisted by several by-pass line orifice plates

In order to overcome the disadvantages of low single treatment effect and long processing cycle of traditional hydrodynamic cavitation (HC) technology in organic dye degradation, a by-pass line orifice plate is used to assist series-wound orifice plates for strengthening the HC effect. In this work, several series-wound orifice plate HC systems with three by-pass line orifice plate connection modes, namely, D-2 (two series-wound orifice plates paralleled with by-pass line orifice plate), D-3 (series-wound orifice plate-1 paralleled with by-pass line orifice plate) and D-4 (series-wound orifice plate-2 paralleled with by-pass line orifice plate), were designed and RhB was used to act as simulated contaminant to conduct the HC degradation experiment. After 60 min treatment under the same conditions, the RhB degradation ratios are 46.12 %, 52.27 % and 31.20 %, respectively, for D-2, D-3 and D-4. And the corresponding mineralization effects are 15.68 %, 24.78 % and 9.83 %, respectively, for D-2, D-3 and D-4. Apparently, D-3 gives the highest degradation ratio and the mineralization effect. The addition of NaClO to D-3 HC system can further enhance the RhB degradation effect, which gives 1.97 synergetic index and 87.28 % RhB degradation ratio. In the future, through continuous modification, it is possible that the by-pass line orifice plate assisted series-wound orifice plate HC technology would be used for large-scale industrial wastewater treatment.

Evaluation of pyrite/sodium hypochlorite for activating purification of arsenic from fractured-bedrock groundwater

In this work, the effectiveness of pyrite/sodium hypochlorite (FeS2/NaClO) treatment to eliminate arsenic (As) from fractured-bedrock groundwater via oxidative adsorption was evaluated. The As concentration in the tested reactors decreased sharply during the initial 5 min, as the addition of NaClO effectively increased the As removal efficiency, attaining 98.6% removal within 60 min in the presence of 0.05 M NaClO. There was no coexisting anion effect (Cl−, CO3−, HCO3−, NO3−, and F−) on the As removal capacity of FeS2/NaClO, except for the PO43− which resulted in less removal of As. X-ray spectroscopy analysis of As(III)-sorbed FeS2 surfaces revealed that a portion of As(III) was oxidized into As(V) during the adsorption process. Scanning electron microscopy-energy-dispersive spectrometer results of FeS2 exhibited the distribution of adsorbed As on the newly formed iron (oxy) hydroxide surfaces, with an As element ratio of 1.27%. A continuous flow-bed column study further demonstrated the efficiency of FeS2/NaClO treatment to lower the contamination level of As at the removal rates of 0.66–3.02 mg/L·day for 160 h. These results suggest that FeS2/NaClO treatment can be considered an effective strategy for removing As in groundwater of bedrock aquifers.

Mechanistic insights into the generation and control of Cl-DBPs during wastewater sludge chlorination disinfection process.

Chlorination disinfection has been widely used to kill the pathogenic microorganisms in wastewater sludge during the special Covid-19 period, but sludge chlorination might cause the generation of harmful disinfection byproducts (DBPs). In this work, the transformation of extracellular polymeric substance (EPS) and mechanisms of Cl-DBPs generation during sludge disinfection by sodium hypochlorite (NaClO) were investigated using multispectral analysis in combination with Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS). The microorganism Escherichia coli (E. coli) was effectively inactivated by active chlorine generated from NaClO. However, a high diversity of Cl-DBPs were produced with the addition of NaClO into sludge, causing the increase of acute toxicity on Q67 luminous bacteria of chlorinated EPS. A variety of N-containing molecular formulas were produced after chlorination, but N-containing DBPs were not detected, which might be the indicative of the dissociation of -NH2 groups after Cl-DBPs generated. Additionally, the release of N-containing compounds was increased in alkaline environment caused by NaClO addition, resulted in more Cl-DBPs generation via nucleophilic substitutions. Whereas, less N-compounds and Cl-DBPs were detected after EPS chlorination under acidic environment, leading to lower cell cytotoxicity. Therefore, N-containing compounds of lignin derivatives in sludge were the major Cl-DBPs precursors, and acidic environment could control the release of N-compounds by eliminating the dissociation of functional groups in lignin derivatives, consequently reducing the generation and cytotoxicity of Cl-DBPs. This study highlights the importance to control the alkalinity of sludge to reduce Cl-DBPs generation prior to chlorination disinfection process, and ensure the safety of subsequential disposal for wastewater sludge.

Flotation Separation of Covellite and Enargite via Oxidation Treatment

The flotation separation of enargite from copper sulfide minerals is difficult owing to the similar floatability and reagent adsorption characteristics of these minerals. In this study, the effect of oxidation treatment using NaClO flow with FeCl3 on the flotation separation of covellite and enargite was systematically investigated. Micro-flotation tests and contact angle measurements indicated that the addition of NaClO and FeCl3 increased the hydrophobicity difference between covellite and enargite. The bench-scale flotation test results show that the bulk copper concentrate could be separated into two products: a low-arsenic-containing (0.46%) and a high-arsenic-containing (5.18%) copper concentrate. X-ray photoelectron spectroscopy and scanning electron microscopy revealed that the oxidization treatment of NaClO caused the accumulation of oxides on the covellite surface, but not on the enargite surface. The varying precipitation of ferric hydroxide on the surfaces of covellite and enargite further exacerbated the difference in the hydrophilicity of these minerals. Thus, a possible method for separating enargite from covellite was obtained through oxidation treatment using NaClO and FeCl3.

Critical concentration for clogging of TEMPO-oxidized bamboo pulp suspensions in a high-pressure homogenizer

Clogging is a critical problem that restricts the delamination of fibers in a high-pressure homogenizer (HPH). In this work, bleached bamboo pulp fibers were pretreated in TEMPO/NaBr/NaClO system prior to high-pressure homogenization to study the clogging condition in a high-pressure homogenizer. Effects of the additional amount of NaClO on the functional groups and morphologies of the bamboo pulp fiber were evaluated by conductometric titration, Fourier transform infrared spectroscopy (FTIR), fiber morphology analysis, and scanning electron microscopy (SEM). The fiber morphology analyzer revealed that the addition of NaClO facilitated to reduce the length of the fiber. The SEM images showed that TEMPO-mediated oxidation had a destructive effect on the fiber surface. The carboxylate contents of bamboo pulp fibers increased with the addition of NaClO, which were beneficial for increasing the critical concentrations of suspensions in the HPH. Nanocelluloses were successfully isolated from the TEMPO-oxidized bamboo pulp with different clogging critical concentrations, as were revealed by atomic force microscopy (AFM).

Adsorption of aqueous Hg2+ and inhibition of Hg0 re-emission from actual seawater flue gas desulfurization wastewater by using sulfurized activated carbon and NaClO

The potential impacts of seawater flue gas desulfurization (SFGD) process used in coal-fired power plants have been greatly concerned because the wastewater containing Hg is directly discharged into the ocean environment without proper treatment. Furthermore, the re-emission of Hg as Hg0 to the atmosphere from SFGD wastewater caused by the reduction of aqueous Hg2+ has also been observed. This study investigated the dependence of Hg2+ adsorption behavior for sulfurized activated carbon (SAC) in actual SFGD wastewater on various influencing factors, including initial Hg2+ concentration, solution pH, contact time, temperature, and the addition of oxidant (sodium hypochlorite, NaClO). SAC exhibited greater Hg2+ adsorption than raw activated carbon at an initial Hg2+ concentration of more than 4,723 ng L−1. The Hg2+ removal efficiency of SAC was slightly larger at pH 7.0 and 8.0 than that at pH within 2.0–6.0. Hg2+ adsorption on SAC was well correlated with the linear adsorption model. Kinetic analysis results indicate that pseudo-second-order adsorption may serve as the rate-limiting reaction of Hg2+ adsorption on SAC. Thermodynamic analyses confirmed the endothermic and spontaneous adsorption behavior of Hg2+ on SAC in the seawater environment. Notably, the addition of NaClO significantly reduced the Hg2+ removal efficiency when SAC was used as the adsorbent. Nevertheless, NaClO addition also inhibited the reduction reaction of Hg2+ to Hg0 by forming strong HgCl complexes, which decreased the risk of Hg0 reemitted into the atmosphere via a SFGD system.

A dual-channel and fast-response fluorescent probe for selective detection of HClO and its applications in live cells

In this work, a novel water-soluble fluorescent probe (BODIPY-P) was designed and synthesized for HClO detection. The probe exhibited ratiometric fluorescence variation with rapid response upon addition of NaClO in deionized water (PBS buffer, pH 7.4) and the change of fluorescence color from red to orange was distinguishable by the naked eyes. The ratio of fluorescence intensity (F567/F629) gradually increased and showed a good linear correlation with HClO concentration in the range of 0–5 eq. The detection limit was estimated to be 31.6 nM, which enables the quantitative detection of trace amount of HClO realizable. Fluorescence titration experiments demonstrated that the probe was highly selective and competitive over other ROS, biothiols, common anions, physiological relevant cations. The recognition mechanism of the probe towards HClO was proved to be HClO-promoted oxidative cleavage of olefinic CC double bond. Most importantly, the fluorescence imaging of BODIPY-P in L929 cells suggested that the probe was cell membrane permeable and low toxic, which was capable of monitoring exogenous and endogenous HClO within a few seconds.

A Ratiometric Fluorescent Probe for Selective Detection of Hypochlorite Anion

A new fluorescent probe based on rhodamine and naphthalimide was synthesized for the discrimination of hypochlorite anion. Upon addition of NaClO, the emission intensities ratio (I576 nm/I528 nm) of the probe 1 increased quickly accompanied with the obvious change of color. The probe 1 also exhibited highly selectivity and fast response to hypochlorite anion. Furthermore, the newly proposed probe has been applied for natural water samples, and a satisfied result was obtained.

A carbon dot-based hybrid fluorescent sensor for detecting free chlorine in water medium

There are two fluorescence peaks for the CD–RhB nanohybrid and the fluorescence of CDs would be quenched with the addition of NaClO while the peak of RhB almost remains constant and an obvious color change (rose red to lilac) accompanies the process which is very convenient to distinguish by the naked eye.

Reversibility of fouling on ultrafiltration membrane by backwashing and chemical cleaning: differences in organic fractions behaviour

Membrane fouling is an inherent phenomenon in ultrafiltration (UF) membrane processes, making it necessary to periodically perform backwashes (BW) and chemical “cleanings in place” (CIP) to restore the initial permeability of the membrane. The objective of this study was (1) to explore systematically the effect of distinct BW-related variables (BW transmembrane pressure, duration, frequency and composition) on the reversibility of UF membrane fouling and on the permeate quality (in terms of total organic carbon, turbidity and UV absorbance) over successive filtration/BW cycles; and (2) to identify which organic fractions were most removed by the membrane and, of these, which were most detached after BW, alkaline and oxidant CIP and acid CIP episodes. For this purpose, a bench-scale outside-in hollow fibre module operated under dead-end filtration mode at constant transmembrane pressure and treating settled water from a drinking water treatment plant was employed. Dissolved organic carbon fractionation was performed by high-performance size-exclusion chromatography. Results showed that, in general, the more intensive the BW was (in terms of high transmembrane pressure, shortened frequency and prolonged duration) the more effective it was in removing fouling from the membrane. Concerning the composition of the water used for the BW, the addition of NaClO led to maximum fouling reversibility, closely followed by the combination of NaOH + NaClO, while citric acid and NaOH contributed little compared to water alone. However, results also showed that irreversible fouling was never completely avoided whatever the BW regime applied, leading to a gradual increase in the total resistance over time. Larger differences in the behaviour of the different organic fractions were observed. UF membrane preferentially retained the heaviest fraction of biopolymers (BP), while the intermediate fraction of humic substances (HS) was removed at a lower percentage and the lighter fractions seemed to entirely pass through the UF membrane. The successive application of BW and CIPs resulted in the detachment from the membrane of a significant percentage of the retained BP, whereas only a modest percentage of the retained HS.

Pre-treatment for ultrafiltration: effect of pre-chlorination on membrane fouling.

Microbial effects are believed to be a major contributor to membrane fouling in drinking water treatment. Sodium hypochlorite (NaClO) is commonly applied in membrane cleaning, but its potential use as a pretreatment for controlling operational fouling has received little attention. In this study, the effect of adding a continuous low dose of NaClO (1 mg/l as active Cl) in combination with alum, before ultrafiltration, was compared with only alum as pretreatment. The results showed that the addition of NaClO substantially reduced membrane fouling both in terms of the rate of TMP development and the properties of the membrane cake layer. Although the size of nano-scale primary coagulant flocs changed little by the addition of NaClO, the cake layer on the membrane had a greater porosity and a substantially reduced thickness. NaClO was found to inactivate bacteria in the influent flow, which reduced both microbial proliferation and the production of proteins and polysaccharides in the cake layer and contributed significantly to improving the overall ultrafiltration performance. NaClO dosing had no adverse impact on the formation of currently regulated disinfection by-product compounds (THMs and HAAs).

Screening of Some Chemical Disinfectants for Media Sterilization During In Vitro Micropropagation of Sugarcane

Three antimicrobial compounds viz. mercuric chloride (HgCl2), sodium hypochlorite (NaClO) and bleaching powder, (CaOCl2) were tested at various concentrations to find out an effective chemical agent for sterilization of nutrient media for in vitro micropropagation of sugarcane. The best result was obtained in presence of NaClO at 0.1 % concentration where maximum 96 % shoot cultures were found contamination free, grew normally and were comparable to the cultures grown on autoclaved nutrient medium (control). Mercuric chloride (0.1 %), though prevented microbial contamination in about 85 % cultures, the shoots remained green for 4–7 days only and thereafter gradually turned brownish-yellow, showed rotting appearance and ultimately approximately half of the sterile shoots died within next one week. No microbial contamination was observed at higher concentrations (0.15 and 0.2 %) of HgCl2 and NaClO both, however the survival and growth of shoots were affected adversely. None of the chemicals was able to prevent microbial contamination up to the desired extent at concentrations below 0.1 %. Shoot cultures could be micropropagated successfully up to 10 subcultures (cycles) on medium supplemented with 0.1 % of NaClO, without any adverse effect on shoot growth. Addition of NaClO in rooting medium at a concentration of 0.1 % was also found equally effective. The results suggested that chemical sterilization of media with sodium hypochlorite, can be a cost effective option of autoclaving during micropropagation of sugarcane at commercial scale.

Relationship between Length and Degree of Polymerization of TEMPO-Oxidized Cellulose Nanofibrils

The influence of 2,2,6,6-tetrametylpiperidine-1-oxyl (TEMPO)-mediated oxidation of wood cellulose and the mechanical disintegration of oxidized cellulose in water on degree of polymerization determined by viscosity measurement (DP(v)) and the apparent length of the TEMPO-oxidized cellulose nanofibrils (TOCNs) was investigated. DP(v) values decreased from 1270 to 500-600 with increasing addition of NaClO in the TEMPO-mediated oxidation stage. The DP(v) values were further decreased by mechanical fibrillation in water. There is a linear relationship between the average fibril length and DP(v); the lengths of TOCNs can be approximated from DP(v) using 0.5 M copper ethylenediamine as a solvent of both the cellulose and oxidized celluloses in TOCNs. Based on the cellulose fibril models and TEMPO oxidation mechanism, the depolymerization behavior of TOCNs is tentatively explained in terms of distribution of disordered regions in wood cellulose fibrils and formation of C6-aldehydes in cellulose fibrils during TEMPO-mediated oxidation.

Acid Leaching of Vanadium from a Vanadium Residue

A process has been developed at the laboratory scale for leaching of vanadium from a vanadium residue using mixed hydrofluoric and sulfuric acid solutions, and NaClO as an oxidant. The extraction studies were carried out using various acid concentrations, liquid/solid ratios, addition of oxidant, reaction temperatures and leaching times. The optimum leaching conditions were then determined. Characterization of the leach residues was carried out by SEM and EDS analysis. Results indicate that the silicates can be effectively destroyed by HF, and the vanadium contained in the vanadium-iron spinel can be leached by the mixed acid solutions. The addition of NaClO enhanced the leaching process by the oxidation of V3+(s) to V4+ and V5+. The leaching efficiency was also improved by raising the leaching temperature, prolonging the reaction rime and using a higher liquid/solid ratio. A vanadium recovery of 81.8% was obtained by the direct acid leaching process

Oxidation of bleached wood pulp by TEMPO/NaClO/NaClO2 system: effect of the oxidation conditions on carboxylate content and degree of polymerization

Oxidation of bleached wood pulp by the TEMPO/NaClO/NaClO2 system was carried out at pH 3.5–6.8 and 25°–60°C with different amounts of NaClO, and investigated in terms of effects of the reaction conditions on carboxylate content and degree of polymerization (DP) of the oxidized pulp. Oxidation was accelerated by the addition of NaClO, when carried out at pH 6.8 and 40°–60°C. Addition of NaClO of more than 0.5 mmol per gram of the pulp was effective to accelerate the oxidation. Carboxylate content of pulp oxidized under such conditions increased to approximately 0.6 mmol/g within 6 h. Although DP of the oxidized pulp gradually decreased with oxidation time, no significant differences in DP of oxidized pulps were found at oxidation temperatures between 25° and 60°C, and DP values of more than 900 were maintained after oxidation for 54 h at 60°C.

Supramolecular Aggregation of Inorganic Molecules at Au(111) Electrodes under a Strong Ionic Atmosphere

Neutral inorganic molecules are generally weak in surface adsorption and intermolecular interactions. Self-assembly of such types of molecule would provide valuable information about various interactions. At electrochemical interfaces, the relative strength of these interactions may be modified through control of electrode potential and electrolyte, which may lead to the discovery of new structures and new phenomena. However, studies of this nature are as yet lacking. In this work, we consider the covalent-bound semimetal compound molecules, XCl(3) (X = Sb, Bi), as model systems of neutral inorganic molecules to investigate their self-assembly at electrochemical interfaces under a high ionic atmosphere. To fulfill such investigations, in situ STM and cyclic voltammetry are employed, and comparative experiments are performed on Au(111) in ionic liquids as well as aqueous solutions with high ionic strength. In the room temperature ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF(4)), potential-dependent partial charge transfer between the Au surface and XCl(3) molecules creates a molecule-surface interaction and provides the driving force for adsorption of the molecules. Supramolecular aggregations of adsorbed XCl(3) are promoted through chlorine-based short-range intermolecular correlation under crystallographic constraint, while repulsive Coulombic interactions created between the partially charged aggregations facilitate their long-range ordering. For SbCl(3) molecules, hexagonally arranged 6- or 7-member clusters are formed at 0.08 to -0.2 V (vs Pt), which assemble into a secondary ( radical31 x radical31)R8.9 degrees structure. For BiCl(3) molecules, both the 6-membered hexagonal and 3-membered trigonal clusters are formed in the narrow potential range -0.3 to -0.35 V, and are also arranged into an ordered secondary structure. Comparative studies were performed with SbCl(3) in concentrated aqueous solutions containing 2 M HCl to simulate the strong ionic strength of the ionic liquid. Almost identical 6-/7-member clusters and long-range ( radical31 x radical31)R8.9 degrees structure are observed at -0.1 V, demonstrating the crucial role of strong ionic strength in such supramolecular aggregations. However, such supramolecular structures are modified and eventually destroyed as ionic strength is further increased by addition of NaClO(4) up to 6 M. The destructive changes of the supramolecular structures are attributed to the alteration of ion distribution in the double layer from cation-rich to anion-rich at increasing NaClO(4) concentration. This modifies and eventually breaks the balance of intermolecular and molecule-electrolyte interactions. Finally, the dynamic behavior of the SbCl(3) assembly is investigated down to molecular level. It has been demonstrated that the initial stage of assembly follows a two-dimensional nucleation and growth mechanism and has a potential-dependent rate that is closely related to the surface mobility of the SbCl(3) clusters. There is a probability that clusters can escape from an existing assembly domain or insert into a vacancy in such a domain while they can also relax with central or ring members in a dynamic fashion. These phenomena indirectly reflect the dynamic properties of cations from electrolytes at the interface. The rich information contained in the self-assembly behavior of SbCl(3) and BiCl(3) demonstrates that neutral inorganic molecules can be employed for fundamental studies of a variety of interesting issues, especially the interplay of various interfacial interactions.

Salicylaldoxime in manganese(III) carboxylate chemistry: Synthesis, structural characterization and physical studies of hexanuclear and polymeric complexes

The use of salicylaldehyde oxime (H 2salox) in manganese(III) carboxylate chemistry has yielded new members of the family of hexanuclear compounds presenting the [Mn 6(μ 3-O) 2(μ 2-OR) 2] 12+ core, complexes [Mn III 6(μ 3-O) 2(O 2CPh) 2(salox) 6(L 1) 2(L 2) 2] (L 1 = py, L 2 = H 2O ( 1); L 1 = Me 2CO, L 2 = H 2O ( 2); L 1 = L 2 = MeOH ( 3)). Addition of NaOMe to the acetonitrile reaction mixture, afforded the 1D complex [Mn III 3Na(μ 3-O)(O 2CPh) 2(salox) 3(MeCN)] n ( 4), whereas addition of NaClO 4 to the acetone reaction mixture afforded an analogous 1D complex [Mn III 3Na(μ 3-O)(O 2CPh) 2(salox) 3(Me 2CO)] n ( 5). The structures of 1–3 present the [Mn 6(μ 3-O) 2(μ 2-OR) 2] 12+ core and can be described as two [Mn 3(μ 3-O)] 7+ triangular subunits linked by two μ 2-oximato oxygen atoms of the salox 2− ligands, which show the less common μ 3-κ 2 O:κ O′:κ N coordination mode. The benzoato ligands are coordinated through the usual syn, syn-μ 2-κ O:κ O′ mode. The 1D polymeric structures of 4 and 5 consist of alternating [Mn 3(μ 3-O)] 7+ subunits and Na + atoms linked through two μ 3-κ 2 O:κ O′:κ N and one μ 4-κ 2 O:κ 2 O′:κ N salox 2− ligands as well as one syn, anti-μ 2-κ O:κ O′ benzoato ligand. DC and AC magnetic susceptibility studies on 1 revealed the stabilization of an S = 4 ground state, and indications of single-molecule magnetism behavior, whereas the DC experimental data from polycrystalline sample of 5 are indicative of antiferromagnetic interactions within the [Mn 3] subunit. Solid state 1H NMR data of 1 were used to probe the spin-lattice relaxation of the system.