Acta Crystallographica Section C-Structural Chemistry
·
2019
·Vol. 75
·期 7
·927-934
·
IF 0.93
Xie L.-Y.,Zhang Y.,Xu H.,Gong C.-D.,Du X.-L.,Li Y.,Wang M.,Qin J.
Two acylhydrazone complexes, bis{6-methyl-N′-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazidato-κ2N′,O}nickel(II), [Ni(C13H12N5O)2], (I), and di-μ-azido-κ4N1:N1-bis({6-methyl-N′-[1-(pyrazin-2-yl-κN1)ethylidene]nicotinohydrazidato-κ2N′,O}nickel(II)), [Cu2(C13H12N5O)2(N3)2], (II), derived from 6-methyl-N′-[1-(pyrazin-2-yl)ethylidene]nicotinohydrazide (HL) and azide salts, have been synthesized. HL acts as an N,N′,O-tridentate ligand in both complexes. Complex (I) crystallizes in the orthorhombic space group Pbcn and has a mononuclear structure, the azide co-ligand is not involved in crystallization and the Ni2+ centre lies in a distorted {N4O2} octahedral coordination environment. Complex (II) crystallizes in the triclinic space group P\overline{1} and is a centrosymmetric binuclear complex with a crystallographically independent Cu2+ centre coordinating to three donor atoms from the deprotonated L− ligand and to two N atoms belonging to two bridging azide anions. The two- and one-dimensional supramolecular structures are constructed by hydrogen-bonding interactions in (I) and (II), respectively. The in vitro urease inhibitory evaluation revealed that complex (II) showed a better inhibitory activity, with the IC50 value being 1.32±0.4 µM. Both complexes can effectively bind to bovine serum albumin (BSA) by 1:1 binding, which was assessed via tryptophan emission–quenching measurements. The bioactivities of the two complexes towards jack bean urease were also studied by molecular docking. The effects of the metal ions and the coordination environments in the two complexes on in vitro urease inhibitory activity are preliminarily discussed.
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Science China-Chemistry
·
2024
·
IF 10.4
Chen Zhi-Wei,Wang Hong-Juan,Liu Chang,Lu Xiu-Li,Lu Tong-Bu
Nitrogen-doped carbon materials have been widely used for the constructions of single-atom catalysts, while the effect of different species of doped nitrogen on the catalytic activity of CO 2 electroreduction has rarely been investigated. Here we found that pyrrolic-N coordinated Ni 2+ catalysts display much higher electrocatalytic CO 2 -to-CO activity and selectivity than the corresponding pyridinic-N coordinated low valent Ni (0−+2) catalysts, and pyrrolic-N coordinated Ni 2 dual-atoms catalyst of Ni 2 /N-CNTs exhibits the best electrocatalytic performance, with over 90% Faradaic efficiencies in a broad potentials from −0.6 to −1.2 V vs. reversible hydrogen electrode, as well as an outstanding CO specific current of 56.2 A/mg Ni and high turnover frequency of 6.2 × 10 4 h −1 , over 7-times higher than those of pyridinic-N coordinated Ni catalysts. Electrochemical results indicate the weak electron-donor nature of pyrrolic-N facilitates the generation of a reduced active site at low overpotential for boosting CO 2 electroreduction. Density functional theory calculations reveal that the reaction free energy for the *COOH formation on pyrrolic-N coordinated Ni catalysts are lower than those on pyridinic-N coordinated Ni catalysts, and a H 2 O-adsorbed Ni 2 /N-CNTs displays the optimized reaction free energy for both *COOH formation and CO desorption, which derive the best catalytic performance.
研究领域:
材料科学
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催化化学
·
电化学
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Ying Yang,Zheng Yuan,Xing-Pei Liu,Qiao Liu,Chang-Jie Mao,He-Lin Niu,Bao-Kang Jin,Sheng-Yi Zhang
The detection and speciation analysis of metal-ion is very important for environmental monitoring. A novel electrochemical biosensor for Nickel(II) detection based on a DNAzyme-CdSe nanocomposite was developed. We firstly hybridized with capture probe (DNA1) and sequentially with DNA (DNA2) on the gold electrode. Then CdSe QDs were incorporated the specific recognition of DNA2 by covalent assembling. Upon addition of nickel ion into the above system, the substrate strand of the immobilized DNAzyme was catalytically cleaved by target Ni 2+ , resulting in disassociation of the shorter DNA fragments containing CdSe QDs. The remaining CdSe QDs on the electrode surface detected by differential pulse anodic stripping voltammetry (DPASV). Under optimal conditions, the as-prepared sensor exhibited high sensitivity and fast response to Ni 2+ with the linear range from 20 nM to 0.2 mM and a low detection limit of 6.67 nM. The prepared biosensor also shows good stability and good reproducibility and high selectivity toward target Ni 2+ against other metal ions because of highly specific Ni 2+ -dependent DNAzyme. Thus, our strategy has a good potential in the environment surveys.
研究领域:
环境科学
·
生物化学
·
分析化学
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PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Mingyu Zhang,Chaoyong Wang,Junkai Zhang,Gang Li,Li Gu
LiNi0.8Co0.1Mn0.1O2 (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li+/Ni2+ intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li+/Ni2+ intermixing, suppressed phase transition, and decreased potential polarization and impedance.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Xinru Pan,Yunzhen Chang,Sheng Zhu,Shujie Liu,Jieru Yang,Gaoyi Han
Ti 3 C 2 T x (TC) shows fascinating application prospects in energy storage field, but its practical applications are limited by the self-stacking and its susceptibility to oxidation. Herein, Ni 2+ /aniline co-intercalated Ti 3 C 2 T x (TC-NA) is prepared by intercalating Ni 2+ /aniline into Ti 3 C 2 T x through a simple ultrasonic and filtration process. On one hand, introducing Ni 2+ and aniline into Ti 3 C 2 T x induces self-assembly of Ti 3 C 2 T x to form 3D-like porous network structure, expanded interlayer spacing and increased electrochemical active sites, which are beneficial to improve its electrochemical performance. On the other hand, the interaction between Ni 2+ and terminal groups of Ti 3 C 2 T x , as well as interaction between aniline and Ti 3 C 2 T x help to passivate Ti 3 C 2 T x to improve the electrochemical stability. At scan rate of 2 mV s −1 , the TC-NA achieves a specific capacitance of 217.6 F g −1 in 1 M H 2 SO 4 employing two-electrode system, and retain 83.5% of its initial capacitance after 10,000 cycles at current density of 5 A g −1 , which is significantly superior to TC (48.8%). Furthermore, after being stored for 470 days, the TC-NA can still retain 67.3% of its initial capacitance after 7000 cycles (TC only 28.1%). This work provides a new idea for improving the electrochemical performance, especially cycling stability of MXene-based materials.
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ChemistrySelect
·
2022
·Vol. 7
·期 45
·e202203339
·
IF 2.307
Junjie Zhang,Zhourong Xiao,Li Wang,Xiangwen Zhang,Guozhu Li
Graphical The key role of Ni valence state on the catalytic SMR performance of Ni/Al 2 O 3 is reported. Ni 0 /Ni 2+ ratio on Ni/Al 2 O 3 is individually regulated by changing the reduction temperature while maintaining the states of nickel particles and support. A deep understanding is gained on how the Ni valence state of Ni/Al 2 O 3 affects the catalytic SMR performance. Steam methane reforming (SMR) is the most mature technology for hydrogen production in industry, and alumina supported nickel (Ni/Al 2 O 3 ) is the most widely used catalyst. Herein, the key role of Ni valence state on the catalytic SMR performance of Ni/Al 2 O 3 is reported. The ratio of Ni 0 /Ni 2+ on Ni/Al 2 O 3 is individually and effectively tuned by changing the reduction temperature after wet impregnation. Catalytic performance of Ni/Al 2 O 3 is greatly dependent on the surface concentration of Ni 0 and Ni 2+ . The catalyst reduced at 675 °C possesses balanced Ni 0 and Ni 2+ sites and exhibits superior catalytic performance, on which 60 % of methane is stably converted at 600 °C. CH 4 -TPD and CO-TPD profiles demonstrate that appropriate Ni 0 /Ni 2+ ratio can promote the adsorption of CH 4 and inhibit the moderate-strength adsorption of CO, which leads to increased SMR activity and selectivity.
研究领域:
化学工程
·
材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenyang Shen,Yi Zhao,Lin Yuan,Ling Ding,Ya Chen,Haisheng Yang,Shimin Liu,Jingheng Nie,Weidong Xiang,Xiaojuan Liang
All-inorganic perovskite nanocrystals (NCs) have become a new generation of low-cost semiconductor luminescent materials for optoelectronic applications due to their excellent optical properties. Prepared perovskite NCs undergo different ion doping and surface modification, which makes the NCs photo-luminescence quantum yield (PLQY) basically uniform. However, stability of perovskite NCs solution in the environment has always been an important factor restricting its practical application. Here, we used melt-quenching method to prepare a series of different Ni 2+ doped CsPbBr 3 NCs glass. Through experimental characterization and DFT calculation it is found that the entry of Ni 2+ into the NCs lattice can eliminate the structural defects of NCs and improve the order of the perovskite lattice. Ni 2+ doped perovskite NCs have strong band edge emission and high quantum yield (up to 84.3%).
研究领域:
材料科学
·
光学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Renlu Liu,Bin Lian
Ubiquitous bio-minerals exert significant effects on the migration and transformation of metal ions in the environment, however, research into the adsorption of heavy metals by biogenic vaterite (BV) has rarely been reported. The aim of our research was to evaluate the removal effects of Cd 2+ , Ni 2+ , and Cu 2+ in single and multi-metal ion aqueous solutions using BV induced by Bacillus subtilis . The results demonstrate that the adsorption data of BV for metal ions are more accurately fitted to the Langmuir model compared with the Freundlich model. The max adsorption capacity (mg/g) order of BV was Ni (270.27) > Cu (178.57) > Cd (172.41) in a single-metal system, and Cu (175.44) > Ni (94.34) > Cd (30.30) in a multi-metal system (pH = 5.0, 2.5 g/L). A competitive effect exists amongst heavy metals in multi-metal ion systems, and Cu 2+ adsorption is less affected by other two ions. Furthermore, BV can maintain favourable adsorption characteristics even in a very strong acidic environment (pH = 3.0), and its adsorptive capability becomes more favourable at higher temperatures. Kinetic analysis shows that the adsorption process can be better described by a pseudo-second-order model. XRD , FTIR, and SEM-EDS results reveal that metal ion adsorption on BV mostly happened through physical means, and the favourable adsorption characteristics of BV might be attributable to its larger specific surface area , aggregated spherical polyporous and organic–inorganic structure.
研究领域:
环境科学
·
地球微生物学
·
生物矿化
·
环境污染与修复
·
水处理技术
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 7
·1-9
·
IF 2.8
Li Wei,Dai Bo,Li Zhao,Yang Hongwei,Liu Guixiang,Xu Fang
A series of Ni x Zn 1− x Fe 2 O 4 ( NiZn, x = 0.15, 0.25, 0.35, 0.45, 0.65, 0.7, 0.8, 0.85) ferrites were prepared via a solid-phase sintering method. The microstructure, phase, and gyromagnetic properties of the NiZn samples were studied in depth. It was found that the lattice constants, density, and hardness of the samples gradually decreased with increasing Ni 2+ content. X-ray diffraction confirmed that all of the samples were in the spinel phase. Scanning electron microscopy indicated that the grain sizes were more uniformly distributed when x = 0.65. Raman analysis showed that the variation of Ni 2+ content affected the occupancy distribution of ferrite ions. The results indicated that Zn 2+ mainly occupied the A-site and that Ni 2+ mainly occupied the B-site. The coercivity ( H c ) of NiZn increased with increasing Ni 2+ content. Meanwhile, the saturation magnetization ( M s ) initially increased and then decreased. When x = 0.65, the total molecular magnetic moment started decreasing because of the decrease in the net A-site magnetic moment. The sample that had a composition of Ni 0.65 Zn 0.35 Fe 2 O 4 had the highest M s intensity with a value of 78.68 emu/g and a maximum value of 4 πM s = 4780 Gs.
研究领域:
材料科学
·
陶瓷
·
固体物理
·
磁学
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·824-832
·
IF 3.502
Dashuang Ding,Yanlong Wang,Changgui Lin,Jing Ren,Wenbo Shi,Pengyuan Wang,Bing Yang,Shaoqian Zhang,Liping Duo
Incorporation of transition-metal ions (TMIs) in the precipitated nanocrystals (NCs) of glass-ceramics (GCs) greatly improves the photonic properties of these materials. The crystal field and coordination of TMIs show fingerprints for spectroscopic characterization. However, it is difficult to probe the effect of the host NCs’ structural phase on doped TMIs’ d-d orbitals. Herein, ZnF 2 :Ni and KZnF 3 :Ni based on controllable crystallization in KF-ZnF 2 -SiO 2 :Ni 2+ GCs were taken as model systems. Compared to ZnF 2 , perovskite-type KZnF 3 has higher binding energy Zn-F bonds in which Ni 2+ are easier to be segregated, which makes KZnF 3 :Ni be better “excited electron trapper” due to hole localization to intra-gap Ni states. These findings contribute to the understanding and design of TMIs-doped GCs in practical applications.
研究领域:
材料科学
·
光子学
·
固态化学
·
纳米材料
·
光学材料
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 4
·1731-1737
·
IF 2.2
Chen Minshu,Li Yuanxun,Li Fuyu
Here, Ca 5 Mn 4− x Ni x V 6 O 24 (CMNVO, x = 0.00–0.08) ceramics are successfully prepared by the solid-phase reaction method, and the connection between the physical phase information, microscopic morphology, Raman spectroscopy, and microwave dielectric properties is explored. The experimental results show that Ni 2+ occupies the Mn 2+ sites without altering the crystal structure and is effectively solid-solvated into the lattice. The relative density reaches a maximum value of 95.9% when the temperature (Tem.) = 900°C and x = 0.06. The trend of the dielectric constant ( ε r ) depends on the ionic polarization rate, and the quality factor ( Q×f values) are correlated with the microstructure and relative density. The maximum value of 43,800 GHz is reached at Tem. = 900°C and x = 0.06, and the temperature coefficient of resonant frequency ( τ f values) is enhanced from −75 ppm/°C to −52 ppm/°C. The CMNVO ( x = 0.06) ceramic obtains better microwave dielectric properties ( ε r = 11.4, Q×f = 43,800 GHz, and τ f = −52 ppm/°C). This ceramic material is expected to be a candidate for low-temperature co-fired ceramic (LTCC) microwave devices.
研究领域:
材料科学
·
电子工程
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高影响因子
APL Materials
·
2020
·Vol. 8
·期 6
·
IF 3.819
Li Xiu,Chen Chen,Zhang Faqiang,Huang Xintang,Yi Zhiguo
Photostrictive effect that has been discovered for over half a century is getting renewed interest in recent years in view of the great potentials for optomechanical applications. Ferroelectric materials represented by lead lanthanum zirconated titanate have been widely studied in this field because of their relatively large photostriction and fast photoresponse, but their wide bandgaps with limit response to visible light hinder further practical application. Here, visible-light-driven photostrictions of the order of 10 −3 are discovered in Bi(Ni 2/3 Nb 1/3 )O 3 –PbTiO 3 (BNNPT) ferroelectric solid solutions. Three BNNPT compositions with different phase structures, exhibiting notably different piezoelectric and photovoltaic properties, are selected to conduct the photostriction investigation, and their analogous photostrictive behaviors contradict with previous acknowledgment that the photostriction of ferroelectrics originates from the photovoltage-induced inverse piezoresponse. The nonuniform shifts of the XRD diffraction peaks under external laser illumination and the redshifts of the laser power dependent Raman modes disclose that the photostriction is mainly attributed to the light-induced distortion of BO 6 octahedra. This study sheds insight into the mechanism of the photostriction of ferroelectrics.
研究领域:
材料科学
·
光学
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高影响因子
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