ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
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2016
·Vol. 71
·期 8
·869-874
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IF 0.686
Gao-Feng Wang,Xiao Zhang,Shu-Wen Sun,Hong Sun,Xia Yang,Hui Li,Chen-Zhong Yao,Shu-Gang Sun,Yu-Peng Tang,Li-Xin Meng
Two Mn(II) complexes, {[Mn(BIPMO) 2 Cl 2 ] · 2(H 2 O)} n ( 1 ) and {[Mn(BIPMO) 2 (SCN) 2 ] · 2(CH 3 OH)} n ( 2 ) (BIPMO = bis(4-(1 H -imidazol-1-yl)phenyl)methanone) with V-shaped BIPMO ligands, were synthesized and characterized by IR spectroscopy and elemental analyses along with their single-crystal X-ray diffraction analyses. The Mn(II) ions in 1 and 2 are both six-coordinated to four nitrogen atoms of four BIPMO ligands and two anions (Cl − for 1 , and SCN − for 2 ) to form a distorted octahedral geometry.
研究领域:
配位化学
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晶体学
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DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 11
·3492-3501
·
IF 2.911
Wang Xueyuan,Chen Li,Huang Deqi,Yue Jinfang,Luo Zhichen,Zeng Tao
Abstract The views on catalytic activity of zeolite in isomerization of α -pinene have not came to an agreement. Thus, the key active substance in zeolite was further studied through experiments. H-mordenite was treated in three ways: (i) calcination under nitrogen flows, (ii) calcination under oxygen flows, (iii) calcination under nitrogen flows after alkali treatment. The properties of modified zeolites were investigated by methods of SEM, EDS, XRD, nitrogen adsorption, NH 3 -TPD, Py-IR, and 29 Si and 27 Al MAS NMR. The results showed that the zeolites produced mesoporous after 0.4M NaOH solution soaking and calcinations above 500 °C, but it had a slight effect on the change of micropore volumes. Comparison of zeolite acid sites amount under different roasting temperature by NH 3 -TPD showed that the decrease of acid sites amount was mainly related to the roasting temperature. Py-IR and 27 Al MAS NMR experiment revealed that Lewis acid was produced by framework aluminum. Finally, Analysis on the influencing factors we studied of H-mordenite catalytic activity in this paper suggested that, in isomerization of α -pinene, the relative concentration of six-coordination aluminum in zeolite is the dominant factor of provided catalytic activity of H-mordenite. Graphical abstract
研究领域:
化学工程
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催化科学
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DOI
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
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2025
·
IF 0.9
Baojuan Zhao,Yiman Lan,Xiaodan Wang,Yan Ma,Ronghu Li,Weizhong Cao,Xiang Wang
Most of the previous artificial oxygen carriers realized the oxygen-carrying function through a reversible combination of penta-coordinated iron(II) porphyrin with oxygen. The other oxygen transport model, in which oxygen competes with other ligands for binding with central ions, has been rarely studied. In this study, oxygen-carrying properties of a series of hexa-coordinated complexes were investigated, with heme dimethyl ester working as an oxygen-carrying component. In addition, both oxygen uptake and the auto-oxidation rate of the hexa-coordinated complexes were also explored. The results indicate that the hexa-coordinated complexes can effectively carry oxygen, provided that there is at least one strong ligand on the fifth or sixth coordination site of the heme dimethyl ester. Promisingly, when one ligand is strong and the other ligand is weak, the hexa-coordinated complexes can exhibit highly efficient oxygen-carrying capacity. By fixing weak ligands and changing strong ligands, it was found that the coordination ability of strong ligands has a significant impact on the oxygenation curve of the system. Furthermore, the auto-oxidation rate of the hexa-coordinated complexes of heme dimethyl ester is related to the hydrophobicity of the fifth and sixth ligands. The longer the hydrophobic chain of the ligand, the slower the auto-oxidation rate. Consequently, the oxygen-binding mode of this heme derivative has the potential to be an effective oxygen carrier.
研究领域:
生物化学
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医学化学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Xiao Chen,Yan Peng,Runli Gao,Hongmei Wang,Chengxin Pei
An isostructural series of rare earth complexes has been synthesized by using the dimethylarsinate ligand. All complexes have the formula [Ln(Me 2 AsO 2 ) 3 ][H 2 O] 8 (Ln = Sm( 1 ), Eu( 2 ), Gd( 3 ), Tb( 4 ), Dy( 5 ), Ho( 6 ), Er( 7 ), Tm( 8 ), Yb( 9 ), Y( 10 )). They are the first rare earth complexes ligated by organoarsinate. Crystallographic characterizations reveal that all the compounds feature 1D chain-like arrangements, in which two rare earth ions are bounded by three dimethylarsinate ligands (syn,syn, μ 2 - ƞ 1 : ƞ 1 ) and the rare six-coordinated rare earth ions display ideal octahedron coordination geometry. The solid state photoluminescent studies reveal that compounds 2 and 4 exhibit the characteristic emission band of the Eu III and Tb III ions respectively. Magnetic measurements indicate Gd( 3 ) shows magnetocaloric effect (MCE) with entropy change of 24.92 J kg –1 K –1 for ΔH = 0 – 7 T at 3 K. The Dy( 5 ) and Yb( 9 ) show field induced slow relaxation, which is rare for octahedron coordinate Ln III compounds.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2025
·
IF 3.4
Hongyu Wang,Fumin Wang,Kaiwei Wang,Xubin Zhang,Changhao Bing,Xiaolu Fan,Tongxue Zhang,Syed Mujtaba ul Hassan
Developing an approach for the efficient synthesis of TS-1 zeolites with desirable morphologies and tunable coordination environments for Ti active sites is a pivotal challenge in the design of high-performance catalysts and zeolite crystal engineering. Herein, we report a cost-effective and efficient additive, guanidinoacetic acid (GAA), and conduct a systematic study on the synthesis of plate-like TS-1 zeolites using GAA as an additive. Introducing GAA during hydrothermal synthesis not only modulates the morphology of TS-1 crystals but also permits GAA to adequately chemically interact with titanium precursors to form hexa-coordinated Ti species. TS-1 zeolites with a controllable b-axis thickness in the range of 80–110 nm, and abundant framework Ti and hexa-coordinated Ti species are successfully achieved by optimizing the synthetic parameters. Through SEM, FT-IR, XPS, TEM, and XRD analysis, the mechanism of GAA altering crystal growth is mainly to inhibit the growth of the (010) plane. A b-axis-oriented TS-1 zeolite enriched with hexa-coordinated Ti species displays better catalytic performance in the 1-hexene epoxidation reaction than the conventional TS-1 zeolite containing only framework Ti species (35 vs 24%). This can be ascribed to the more active hexa-coordinated Ti species and shorter diffusion distance. This synthetic strategy provides a way to change the zeolite morphology and tune the number and distribution of Ti species in TS-1 zeolites.
研究领域:
催化材料
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晶体工程
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化学合成
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DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
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2025
·Vol. 95
·期 6
·1444-1454
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IF 0.8
Wang Xiang,Wang Xiaodan,Zhang J.,Li R.,Zhao B.
Previous artificial oxygen carriers mainly rely on the reversible combination of five coordination of porphyrin iron and oxygen to achieve oxygen carrying function. However, another oxygen-carrying mode, the competitive binding between oxygen and other ligands, has rarely been studied. In this study, heme dimethyl ester [HDME(II)] was used as the oxygen-carrying component to study the oxygen-carrying properties of its hexacoordinated complexes. The oxygen absorption capacity of the hexacoordinated complexes was determined by gas absorption method. At the same time, the oxygen absorption capacity was used as an indicator to investigate its s oxidation rate. The results show that in the five and six complexes of HDME(II), when there is a strong ligand, the hexa-coordinated complexes can effectively coordinate oxygen. When there is a strong ligand and a weak ligand at the same time, the oxygen binding capacity of the hexa-coordinated complexes is significantly improved. In addition, when the weak ligand is fixed and the strong ligand is changed, it can be observed that the coordination ability of the strong ligand has a significant effect on the oxygenation curve of the system. In addition, the long hydrophobic chain of the axial ligand in the HDME(II) hexacoordinated complexes helps to slow down the oxidation rate of the hexa-coordinated complexes. When the axial ligand has a certain reducibility, the oxidation rate of the hexacoordinated complexes is further reduced. Therefore, the oxygen carrier mode of the heme derivative is expected to become an effective oxygen carrier.
研究领域:
无机化学
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生物无机化学
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配位化学
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材料科学
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人工血液替代品
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DOI
高影响因子
Journal of Energy Storage
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2025
·
IF 9.8
Huan-Huan Liu,Rui-Yue Qi,Dong Xiang,Guo-Xian Yu,Hai-Feng Li,Jing Xiang
A stable 6-coordinate Fe III compound K[Fe III (THEED)] (H 4 THEED = N,N,N′,N′ -tetrakis(2-hydroxyethyl)ethylenediamine) was used as the anodic active material for all‑iron alkaline redox flow battery (ARFB), which shows a redox potential of E 1/2 = −0.93 V ( vs. Ag/AgCl). When it was paired with K 4 [Fe(CN) 6 ] as the cathodic counterpart, it gives a cell voltage of ∼1.3 V. Fe(THEED) exhibits the enhanced resistance to metallic iron deposition as compared with the 5-coordinate Fe-triethanolamine complex Fe(TEOA), mainly attributed to its saturated 6-coordinate structure with a large stabilization constant that effectively inhibits various side reactions. The cell performance of ARFB can be significantly improved by using Fe(THEED) as the negative active material. The ARFB containing 0.5 M Fe(THEED) and Fe(CN) 6 electrolytes demonstrated a discharge capacity of 14.59 Ah L −1 at a current density of 80 mA cm −2 , with a coulombic efficiency (CE) of 99.8 %, and an energy efficiency (EE) of 79.9 %. The peak power density can reach 194 mW cm −2 at a current density of 240 mA cm −2 . The system can exhibit exceptional cycling stability with 99.9 % capacity retention over 100 cycles (∼36 h). The low cost of Fe-THEED and Fe(CN) 6 components increases the economic viability, as compared to conventional V-based and previously reported Fe-based systems.
研究领域:
电化学储能
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能源材料
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液流电池
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无机化学
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应用化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Xuliang Deng,Yang Xu,Jincheng Liu,Dong Lin,Ze Zong,Juncong Yuan,Zhiyang Li,Guanghui Zhao,Yongjun Zhang,Yibin Liu,Xiaobo Chen,Xiang Feng,De Chen,Chaohe Yang,Honghong Shan
Regulating the Ti active sites in titanosilicates with different coordination modes is of prime scientific and industrial significance to the rational design of efficient catalysts for olefin epoxidation. In this study, the Ti species in Ti-beta zeolite catalysts (open/closed tetra-coordinated Ti sites, hexa-coordinated Ti species, and TiO2) were keenly controlled via the dealumination-metallization approach. By multiple characterizations, kinetics study, and multivariate model analysis, it is found that the open tetra-coordinated framework Ti(OH)(OSi)3 species contribute more to the catalytic performance for 1-hexene epoxidation with H2O2. Moreover, the Ti-beta with rich open tetra-coordinated Ti(OH)(OSi)3 species showed significantly improved reaction performance (TON: 401, conversion: 64%, selectivity: 98%, H2O2 efficiency: 97%) with lower apparent activation energy. This study not only opens up new prospects for the design of efficient titanosilicates by modifying Ti microenvironments but also proposes the strategy to improve the content of open tetra-coordinated Ti sites.
研究领域:
催化
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材料科学
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化学工程
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无机化学
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DOI
高影响因子
MACROMOLECULES
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2025
·
IF 5.2
Yicong Wang,Peiyi Cheng,Shu Zhang,Yixian Wu
A six-coordination stable structure of Ni2+ with two carboxylate ligands and two sulfur atoms in side chains of ethylene-propylene copolymers can be constructed to form 3D physically cross-linked networks according to a density functional theory simulation. The reversibly cross-linked polar ethylene/propylene/5-ethylidene-2-norbornene copolymer elastomers (rcEPDMs) with triple noncovalent cross-linking sites of hydrogen bonds, ionic aggregation, and 6-coordination Ni2+ bonds can be successfully in situ prepared by the reaction of carboxyl functionalized EPDM with NiCl2·6H2O in the presence of tetrabutylammonium hydroxide. The rcEPDM networks with Ni2+ having a coordination number of 6 (rcEPDM-Ni2+) show much higher cross-linking density than their analogues with Zn2+ having a coordination number of 4 (rcEPDM-Zn2+), which is confirmed by swelling experiments and Mooney–Rivlin analysis. The rcEPDM-Ni2+ networks exhibit a much higher tensile strength of 19.0 MPa at an elongation of 587% than rcEPDM-Zn2+ networks (6.8 MPa at 777%). The mechanical properties of rcEPDM-Ni2+ networks containing triple cross-linking sites are superior to those of networks containing hydrogen and coordination bonds as well as those containing ionic aggregation and coordination bonds. The hysteresis energy of rcEPDM-Ni2+ networks increases by 19 times, and the strain recovery reaches 95% when the strain gradually increases from 50% to 400%, which is attributed to the synergy of noncovalent cross-linking sites. The hysteresis energy of rcEPDM-Ni2+ network is 66% higher than that of rcEPDM-Zn2+ networks at 400% strain, due to the formation of a more stable and dense six-coordination structure of rcEPDM-Ni2+ networks. To the best of our knowledge, this is the first example of renewable triple noncovalently cross-linked polar EPDM with high strength and outstanding strain recovery using Ni2+-carboxylate coordination bonds. The renewable cross-linked EPDM elastomers would have potential applications in organic–inorganic composite materials, bonding agents, sealing parts, and reusable elastomers.
研究领域:
高分子科学
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材料化学
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物理化学
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材料力学性能
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绿色与可持续材料
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Qiang Zhao,Han Peng,He-zhen Wang,Shu-ran Gao,Jun-zhao Wang,Lin-Xi Qin,Meng-ting Fan
In order to better study the properties of rare earth complexes in terms of fluorescence, magnetism, and fluorescent probes, in this work, 5-(2-carboxyphenoxy)isophthalic acid (H 3 ocpia) and rare metal ions Eu 3+ , Tb 3+ , Dy 3+ were used to synthetic metal complexes by solvothermal reaction. Then three complexes Eu(ocpia) (1) , Tb(ocpia) (2) and Dy(ocpia) (3) were synthesized, their structural formulas are as follows: EuC 15 H 7 O 7, TbC 15 H 7 O 7 and DyC 15 H 7 O 7 . Data on the structure acquired via an X - ray single - crystal diffractometer indicates that complexes 1, 2 , and 3 possess the same spatial structures. They are two-dimensional planar structures with undulating ripples. Moreover, solid - state fluorescence tests were carried out on complexes H 3 ocpia, 1 , and 2 , and magnetic property tests were done on complexes 2 and 3 . Fluorescence recognition studies were conducted on complexes 1 and 2 in dispersed systems. The solid-state fluorescence results show that complexes 1 and 2 have excellent fluorescence properties, with higher fluorescence intensity than the ligand. The CIE chromaticity coordinates of complexes 1 and 2 are (0.59, 0.34) and (0.33, 0.62), respectively, and exhibit bright characteristic lights of europium and terbium under fluorescent lamps. Magnetic susceptibility measurements reveal that compounds 2 and 3 exhibit antiferromagnetic coupling behavior between adjacent metal centers. Fluorescence recognition studies have shown that complexes 1 and 2 exhibit good recognition of acetone in dispersed systems, the detection thresholds were determined to be 0.063 vol.% for complex 1 and 0.136 vol.% for complex 2 .
研究领域:
无机化学
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配位化学
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材料科学
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荧光光谱学
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磁性材料
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传感器技术
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晶体学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）