CHINESE JOURNAL OF CATALYSIS
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2016
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IF 2.628
Jianqiang Zhang,Yongsheng Peng,Wenguang Leng,Yanan Gao,Feifei Xu,Jinling Chai
We introduced bipyridine ligands into a series of two-dimensional (2D) covalent organic frameworks (COFs) using 2,2′-bipyridine-5,5′-dicarbaldehyde (2,2′-BPyDCA) as a component in the mixed building blocks. The framework of the COFs was formed by the linkage of imine groups. The ligand content in the COFs was synthetically tuned by the content of 2,2′-BPyDCA, and thus the amount of metal, palladium(II) acetate, bonded to the nitrogen ligands could be manipulated. Both the bipyridine ligands and imine groups can coordinate with Pd(II) ions, but the loading position can be varied, with one ligand favoring binding in the space between adjacent COFs′ layers and the other ligand favoring binding within the pores of the COFs. The Pd(II)-loaded COFs exhibited good catalytic activity for the Heck reaction.
研究领域:
材料化学
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催化化学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2022
·Vol. 2022
·期 29
·e202200376
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IF 2.551
Zhuang-Hua Liu,Ran-Qi Chen,San-Tai Wang,Ya-Jie Liu,Wei-Hui Fang,Jian Zhang
Graphical The solvothermal synthesis of low nuclearity aluminum clusters to polynuclear aluminum clusters was achieved by regulating the amount of nitrogen-containing ligands. Present herein is the currently largest catecholato-based aluminum oxo clusters. By adjusting the amount of auxiliary 3, 5-dimethylpyrazole ligands, the synthesis of aluminum oxo clusters (AlOCs) ( AlOC-86 ) to high nuclearity AlOCs ( AlOC-88 ) were successfully achieved. Such synthetic strategy is applicable to imidazole ligands and new compounds ( AlOC-87 and AlOC-89 ) were obtained. Single crystal analysis shows that AlOC-86 and AlOC-87 are hexanuclear clusters made up of two edge-sharing tetrahedral clusters. The nuclearity of compounds AlOC-88 and AlOC-89 is doubled and they are S-shape dodecanuclear AlOCs. The aggregation of such clusters is attributed to the labile sites on the two ends of the hexanuclear clusters. In addition, open aperture (OA) Z-scan measurements results indicate that these compounds exhibit manifest reverse saturation absorption (RSA) response.
研究领域:
无机化学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Xiong-Feng Ma,Rui Xiao,Yingcong Wei,Shaohui Zhang,Xiaoyi Hu,Ling Zhang,Nanfang Qin,Lele Wang,Zhengxin Ding,Huaxiang Lin,Zizhong Zhang,Jinlin Long,Rusheng Yuan
Photothermal catalytic N-acetylation of aniline has been a promising strategy to synthesize amides, which combined the advantages of thermal catalysis and photocatalysis . Herein, we demonstrate a high-performance strategy to synthesize amides catalyzed by the in-situ formed first-row transition-metal (Fe, Co, Ni, Mn et al.) complexes nanodots (TMC NDs) under solar light excitation without using noble metals or strong acids. The dual-functional nitriles substrates acted as the ligands to coordinate with transition-metal salts affording photosensitive TMC NDs with high solar-to-thermal energy conversion efficiency. Intramolecular charge transitions reduced the energy barrier of nitriles activation by weakening C N bond and triggered near-field temperature rise via the electron–phonon scattering non-radiative pathway. The reaction system exhibited good tolerance to different functional groups, affording a series of amide derivatives. Such a dynamic coordination reaction mode and the in-situ formed TMC NDs opens new avenues toward solar-heat conversion via photon–phonon coupling in the field of chemical synthesis.
研究领域:
化学合成
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材料科学
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催化反应
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DOI
高影响因子
Polymers
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2023
·Vol. 15
·期 5
·1231
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IF 5
Zhenyu Han,Yongqiang Zhang,Liang Wang,Guangqian Zhu,Jia Kuang,Guangyu Zhu,Guangqiang Xu,Qinggang Wang
3,4-Enhanced polymerization of isoprene catalyzed by late transition metal with high activity remains one of the great challenges in synthetic rubber chemistry. Herein, a library of [N, N, X] tridentate iminopyridine iron chloride pre-catalysts (Fe 1–4) with the side arm were synthesized and confirmed by the element analysis and HRMS. All the iron compounds served as highly efficient pre-catalysts for 3,4-enhanced (up to 62%) isoprene polymerization when 500 equivalent MAOs were utilized as co-catalysts, delivering the corresponding high-performance polyisoprenes. Furthermore, optimization via single factor and response surface method, it was observed that the highest activity was obtained by complexFe 2with 4.0889 × 107g·mol(Fe)−1·h−1under the following conditions: Al/Fe = 683; IP/Fe = 7095; t = 0.52 min.Keywords:tridentate iminopyridine iron complex;high activity;isoprene polymerization;response surface methodology
研究领域:
有机化学
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高分子化学
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DOI
PubMed
高影响因子
Inorganic and Nano-Metal Chemistry
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2019
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IF 0.685
Xue-Wen Liu,Jie Huang,Yu-Xuan Tang,Song-Bai Zhang,Ji-Lin Lu
Two new ruthenium complexes containing a new polyaza ligand were found to inhibit the DNA supercoiled relaxation mediated by topoisomerase I (topo I), cleave DNA under irradiation and interact with CT-DNA by intercalation. Both complexes exhibited fast singlet oxygen generation rate, and DNA photocleavage reaction should be initiated by 1O2. Furthermore, complex 2 showed higher photocleavage activity, topo I inhibition activity, and DNA affinity than complex 1. This work shows that two complexes can act as DNA binders with high affinity and good DNA photocleavers. Furthermore, complex 2 can act as a good topo I inhibitor.
研究领域:
化学
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分子生物学
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药理学
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DOI
高影响因子
ACS Omega
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2025
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IF 4.3
Hongda Jia,Sihuang Huang,Wensi Guo,Jingjiao Liu,Chaojie Gai,Jicheng Yu,Haojie Cao,Qigu Huang
Facing global energy and environmental challenges, transportation industries are adopting lightweighting as a key strategy to improve energy efficiency. Nylon12 is a crucial material in lightweight applications. However, 1,5,9-cyclododecatriene (1,5,9-CDT) serves as a key intermediate in its synthesis, and the preparation methods of 1,5,9-CDT currently still suffer from low catalytic activity and insufficient conversion, coupled with a lack of mechanistic studies on macrocyclic formation. To address these challenges, this study focuses on the key synthesis technology of 1,5,9-CDT by designing and preparing four novel nitrogen-ligand-supported transition metal catalysts (Cat.1–Cat.4). Using 1,3-butadiene as the monomer, the effects of the catalyst performance and reaction conditions on the oligomerization process were systematically investigated. These results demonstrate that Cat.2, under optimized conditions (toluene as solvent, catalyst content of 0.2 g/L in polymerization solution, polymerization temperature of 50 °C, and n(Al)/n(Ti) ratio of 50 with sesquiethylaluminum chloride as cocatalyst), achieves a 93% yield of ctt-1,5,9-CDT, verified by 1H (13C) NMR, FT-IR, and GC-MS. Density functional theory (DFT) calculations reveal a thermodynamically controlled reaction pathway, confirming the experimental product as the most stable conformation and elucidating the origin of high selectivity. This work provides a green and efficient catalytic system for 1,5,9-CDT synthesis while enriching the theoretical foundation of macrocyclic compound formation mechanisms. The findings exhibit significant potential for industrial-scale applications.
研究领域:
有机化学
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催化化学
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高分子化学
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理论化学
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材料合成
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产品关联
DOI
PubMed
高影响因子
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