Crystals
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2023
·Vol. 13
·期 11
·1587
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IF 2.7
Yiyi Xiao,Hui Huang,Jinkun Guo,Mi Yan,Liyuan Wei,Yu Liu,Shiliang Huang,Rufang Peng,Bo Jin
Energetic complexes represent a crucial research direction for the design and synthesis of novel energetic materials. In this work, 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105), a significant explosive compound with exceptional comprehensive properties, was selected as the ligand for coordinating with various metal ions. Four novel energetic complexes, Ni(C4H3N6O5)2·DMF (1), Co(C4H3N6O5)2·2DMF (2), Mn(C4H3N6O5)3·3/2DMF (3), and Cu3(C4H2N6O5)3·3DMF (4) were successfully synthesized, and their crystal structures were identified by a single-crystal X-ray diffraction technique. The structural analyses illustrated that LLM-105 can form either a mononuclear metal complex after the deprotonation of one amino group or a trinuclear metal complex after the deprotonation of two amino groups. Compound1exhibits a planar quadrilateral geometry, while both compounds2and3display distorted octahedral configurations. Compound4has three metal centers and exhibits two coordination configurations of distorted tetragonal pyramid geometry and planar quadrilateral geometry. The detonation performances of compounds1–4were also theoretically calculated, revealing their favorable explosive properties. These findings emphasize the diverse coordination modes of LLM-105 and the structural variability and adjustability of its complexes, offering valuable insights for regulating both the structure and performance of the LLM-105 complex as well as researching its deprotonation.Keywords:energetic complexes;LLM-105 ligand;single-crystal structure;coordination modes
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MINERALS ENGINEERING
·
2023
·
IF 4.8
Yimei Xiao,Jinchan Feng,Bingqiao Yang,Huihua Luo,Fang Zhou
In this work, fulvic acid (FA) was tested as a novel arsenopyrite depressant in the flotation separation of chalcopyrite from arsenopyrite with or without calcium hypochlorite (Ca(ClO) 2 ). The flotation behaviors were investigated by single and artificial mixed mineral flotation tests. The depression mechanism of FA and Ca(ClO) 2 on mineral surface was uncovered by electrochemical measurement, Zeta potential, contact angle, adsorption capacity, Raman, Fourier Transform Infrared spectroscopy (FTIR), and X-ray Photoelectron Spectroscopy (XPS). Flotation tests illustrated that FA had strong depression action on arsenopyrite but hardly influenced the flotation of chalcopyrite with or without Ca(ClO) 2 . Electrochemical measurement and Raman spectra results showed that the oxidation degree of arsenopyrite surface was higher than that of chalcopyrite. Zeta potential, FTIR and adsorption capacity results illustrated that FA preferred to adsorb on arsenopyrite surface than chalcopyrite surface, and the introduction of Ca(ClO) 2 facilitated the adsorption of FA on arsenopyrite surface. XPS results indicated that Ca(ClO) 2 promoted the oxidation of arsenopyrite surface to form more iron oxide products. In addition, FA strongly absorbed on arsenopyrite surface via the complexing between hydroxyl groups and Fe oxidized product to form Fe-OH species, preventing the adsorption of sodium isobutyl xanthate (SIBX) on arsenopyrite and rendering it hydrophilic. While FA weakly adsorbed on chalcopyrite surface, which could be substituted by SIBX and regain hydrophobicity.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Fengping Zhan,Yanan Zhao,Xiaohui Dai,Jingbin Zeng,Qingxiang Wang
The development of new method for the rapid and facile screening of antibiotics residues in food is of great importance in food safety. Herein, a nanocompisite of polyaniline@copper-1,3,5-benzenetricarboxylic acid (PAN@Cu-BTC) with excellent electrochemical activity was directly prepared on the screen-printed electrode surface by a two-step electrochemical synthesis method. Then the tetracycline aptamer (TC-Apt) was assembled onto the electrode surface through the coordination between 5′-PO 4 3- on the aptamer and Cu 2+ on the MOF, achieving a novel electrochemical aptasensor for tetracycline (TC). The PAN@Cu-BTC has two functions in the aptasensors, namely the immobilization matrix of the aptamer probe and the internal signal source for target recognition. The electrochemical sensing assays showed that the capture of TC-Apt to the target on the electrode surface could cause the decrease of the electrochemical signal of PAN@Cu-BTC. Based on this, the TC can be analyzed in a wide range from 10 pM to 1 µM, with a low detection limit of 0.32 pM. The recoveries of the aptasensor for the detection of TC from Ctenopharyngodon idella meat were 90.0 %∼102.0 %, indicating that the constructed aptasensor is applicable for the detection of TC residues in fresh aquatic products.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Minjie Peng,Yufeng Sun,Wen Zang,Changyong Gao,Lijing Miao,Aiguo Wu,Yujie Zhang
Background As a common industrial raw material and chemical intermediate, p-Aminophenol (pAP) is recognized as a serious pollutant that poses harm to both the environment and human health. The traditional detection methods for pAP have the advantages of good selectivity and high sensitivity, but their complex operation and time-consuming defects limit their application in on-site detection. Therefore, it is necessary to develop a simple, low-cost, rapid and high-sensitivity method for the detection of pAP. Results Noble metal nanoparticles have been widely used in colorimetric sensing because of their simplicity and practicality. Herein, we presented a simple, excellent sensitive and selective colorimetric method for high-performance detection of pAP based on Cu–Au nanoparticles (Cu–Au NPs) and KIO 3 . In the presence of pAP, KIO 3 was reduced to I 2 , which subsequently chemically adsorbed onto Cu–Au NPs surface and induced the dispersion and reorganization of Cu–Au NPs, along with prominent color change of the dispersion from gray-blue to pink and the transformation of Cu–Au NPs from chain-like aggregates to individual dispersed, irregular, subspherical nanoparticles. The mechanism was verified by TEM , DLS , Zeta potential , UV–vis and XPS . Meanwhile, Cu–Au NPs probe can rapidly detect pAP within 25 min, the limit of detection of pAP probe is 5 μM by the naked eyes and 0.03 μM by UV–vis absorption spectrum . Significance and novelty This is the first colorimetric assay for pAP based on Cu–Au NPs probe. The satisfactory linearity (R 2 = 0.9984) indicates that the colorimetric probe based on Cu–Au NPs and KIO 3 can be utilized for quantitative detection of pAP. The detection results of pAP in real environmental water samples, urine samples and paracetamol tables demonstrate the practicability of pAP colorimetric probe.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Yumei Zhang,Xinhao Liu,Yandong Duan,Yue Wang,Jinying Song,Qingzhi Luo,Jing An,Xueyan Li,Huiying Mu,Desong Wang
Azobenzene and hydrazobenzene compounds are essential intermediates for synthesizing pharmaceuticals and dyes. Meanwhile, the hydrazobenzene/azobenzene couple is a potential hydrogen storage system when both the dehydrogenation of hydrazobenzene and the hydrogenation of azobenzenes can be achieved under mild reaction conditions. In this work, we report an entirely mutual transformation of azobenzene and hydrazobenzene under very mild conditions using porous BN supported Cu nanoparticles (Cu/PBN) as the catalyst for the first time. Direct oxidative dehydrogenation reaction proceeded in the open air with the removal of molecular hydrogen as the by-product and a wide range of hydrazobenzenes readily undergoes dehydrogenation, resulting in an excellent yield of the corresponding azobenzene.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Hua Li,Mudong Tu,Yahan Fang,Tianzhi Hao,Baodui Wang
At present, a variety of catalysts have been studied and used for the electrocatalytic reduction of nitrate. However, it is still a great challenge to improve the selectivity of the electrocatalytic nitrate reduction reaction (NO3–RR) catalyst for ammonia and reduce the activity of the competitive reaction. Herein, two-dimensional CuOx nanosheets with abundant oxygen vacancy defects were in situ grown on Cu nanoparticles to construct Cu/2D-CuOx composite nanomaterials as nitrate reduction electrocatalysts. The two-dimensional (2D) nanosheet morphology facilitated the exposure of active sites and promoted the mass/charge transfer process during electrocatalysis. As a result, the synergistic effect of abundant oxygen vacancy defects and the 2D nanosheet-like structure on the surface of the catalyst endows the Cu/2D-CuOx with superior performance for the nitrate reduction reaction, achieving high ammonia selectivity (97.56%) and NH4+ yield (1476 μg h–1 mg–1).
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ANALYTICAL BIOCHEMISTRY
·
2023
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IF 2.9
Qinhong Yin,Xiaolan Yang,Lihua Yang,Dezhi Yang,Yaling Yang,Yanqin Zhu
As newly developed synthetic enzymes with exceptional catalytic capabilities and outstanding stability, nanozymes have drawn considerable interest in the realm of sensing. Using a simple hydrothermal process, iodine and copper-doped carbon dots (Cu,I-CDs) with simulated enzymes were fabricated in the current investigation. Cu,I-CDs demonstrate peroxidase-mimicking function together with high catalytic effectiveness due to aforementioned features. This led to generation of a colorimetric sensor for quick and accurate quantitative assessment of morphine (MOR). The outcomes showed the method's usefulness for the colorimetric detection of MOR. The linear range for MOR detection is 0.25–25 μg/mL having a reduced detection limit of 64 ng/mL. This sensor's successful use in the analysis of MOR in biological material is more noteworthy.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Lirong Lv,Zhongguo Zhang,Sheng Wang,Yue Shan,Liangliang Wang,Tongzhou Xu,Peiran He
A series of Y Ce catalysts were prepared using Y-loaded (Y = Cu, Co, Mn) Ce-based metal–organic framework as a precursor. Mn-loaded CeO 2 exhibited significantly better catalytic activity in the catalytic oxidation of ethyl acetate (EA) than noble metal catalyst. The relationship between the physicochemical properties of Y Ce catalysts and catalytic activity was studied by different characterization methods. The enhanced catalytic activity was attributed to the strong interaction between the transition metals and Ce, high specific surface area, abundant lattice defects, more oxygen vacacies and higher O latt /(O latt + O ads + O w ) molar ratios. The main intermediates in the oxidation of EA were ethanol, acetic acid, acetone, acetaldehyde and diethyl ether.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 19
·195403
·
IF 3.874
Ding Zhang,Xiaoning Tang,Zhaoguang Yang,Ying Yang,Haipu Li
The development of renewable energy conversion and storage has triggered the development of electrode materials for oxygen evolution reaction (OER) and supercapacitors. Here we report a highly active Cu doped NiFe nanosheets hydroxide electrode with rich oxygen vacancies (OVs) (denoted as H-NiFeCuO/NF) prepared by in situ anodic electrodeposition on the three-dimensional macroporous nickel foam (NF) substrate followed by heat treatment with H2. The as-prepared H-NiFeCuO/NF electrode showed the initial potential of 1.44 V (versus RHE) for OER and 980 F g−1 specific capacity as supercapacitor in 1 M KOH. Further investigation suggested that the tuning of composition and structure by doping copper ions and creating OVs helped accelerate the electrochemical reactions. This practice provides an efficient approach for the fabrication of heteromultimetallic hydroxide monolithic electrode with high performance in OER or supercapacitor application.
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MATERIALS & DESIGN
·
2021
·
IF 7.991
Tayiba Ilyas,Fazal Raziq,Sharafat Ali,Amir Zada,Nasir Ilyas,Rahim Shaha,Yong Wang,Liang Qiao
Water splitting and CO 2 conversion are emerging energy transfer techniques to generate hydrogen and low carbon fuel as eco-friendly energy sources. Herein, a frugal and facile approach is reported for decorating MoS 2 nanosheets on copper nanorods to design MoS 2 /Cu architecture as a trifunctional catalyst for electrochemical water splitting and photocatalytic CO 2 conversion. Under optimized conditions, MoS 2 /Cu electrocatalyst shows high performance at an overpotential of 252 mV for oxygen evolution reaction and 160 mV for hydrogen evolution reaction to attain 20 mAcm −2 and 10 mAcm −2 current densities in alkaline medium. The improved efficiency is mainly credited to the synergistic effect of MoS 2 nanosheets and Cu nanorods architecture. The electrode delivered a cell voltage of ~1.508 V to impart about 10 mAcm −2 current density with high durability. Also, the negligible overpotential decay after running the cell for 12 h with 3000/HER and 2000/OER CV cycles suggests remarkable stability that makes it a promising electrocatalyst for energy production. The photocatalytic CO 2 conversion activity was also measured, where MoS 2 /Cu exhibited a significant efficiency of CO 2 to methane conversion (CH 4 ~ 23 µmol g −1 h −1 ). Based on the obtained results, it is foreseeable that this work validates the significance of transition metals tuning for electrocatalysts and photocatalysts toward more efficient water electrolysis and CO 2 reduction for potential large-scale energy applications.
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ACS Catalysis
·
2021
·
IF 13.084
Hong Li,Tian-Wen Jiang,Xianxian Qin,Jie Chen,Xian-Yin Ma,Kun Jiang,Xia-Guang Zhang,Wen-Bin Cai
Electrochemical CO2 reduction reaction (CO2RR) on Cu is often plagued by low selectivity and stability because of less-controlled preparation of electrocatalytic materials as well as insufficient understanding of the structure–performance relation. In this work, we develop a facile galvanic displacement protocol, involving an electropolished Cu sheet in a mixed Sb(III)–Cl– precursor solution, to form an Sb-modified Cu electrode that can selectively convert CO2 to CO with a Faradaic efficiency of ca. 82% and an undecayed reduction current over 12 h. Moreover, in situ infrared spectroscopy detects a relatively weak and red-shifted CO band on the Sb-modified Cu electrode as compared to that on the Cu electrode at potentials of CO2RR. Density functional theory calculations reveal that the Sb clusters on the Cu surface change the electronic structures of Cu as well as Sb and thus weaken the CO binding strength on Cu sites, consistent with the observed CO band feature and high CO selectivity. These findings may shed light on the rational design of high-selectivity CO2RR electrocatalysts by proper interfacial structure engineering.
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Acta Pharmaceutica Sinica B
·
2021
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IF 11.614
Lin Hou,Yanlong Liu,Wei Liu,Mervat Balash,Hongling Zhang,Yi Zhang,Huijuan Zhang,Zhenzhong Zhang
Although approved as an alcohol-abuse drug, disulfiram (DSF) exhibited potential anticancer activity when chelated with copper (Cu). However, the low level of intrinsic Cu, toxicity originated from exogenous Cu supplementation, and poor stability of DSF in vivo severely limited its application in cancer treatment. Herein, we proposed an in situ DSF antitumor efficacy triggered system, taking advantages of Cu-based metal-organic framework (MOF). In detail, DSF was encapsulated into Cu-MOF nanoparticles (NPs) during its formation, and the obtained NPs were coated with hyaluronic acid to enhance the tumor targetability and biocompatibility. Notably, DSF loaded Cu-MOF NPs maintained stability and integrity without Cu 2+ leakage in blood circulation, thus showing excellent biosafety. Once accumulating at tumor site, NPs were internalized into tumor cells via receptor-mediated endocytosis and released DSF and Cu 2+ simultaneously in the hyaluronidase-enriched and acidic intracellular tumor microenvironment. This profile lead to in situ chelation reaction between DSF and Cu 2+ , generating toxic DSF/Cu complex against tumor cells. Both in vitro and in vivo results demonstrated the programmed degradation and recombination property of Cu-based MOF NPs, which facilitated the tumor-specific chemotherapeutic effects of DSF. This system provided a promising strategy for the application of DSF in tumor therapy.
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