Polymers
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2019
·Vol. 11
·期 9
·1389
·
IF 3.164
Jianye Ji,Xin Ge,Weijie Liang,Ruiyuan Liang,Xiaoyan Pang,Ruoling Liu,Shuyi Wen,Jiaqi Sun,Xunjun Chen,Jianfang Ge
MQ silicone resins represent a broad range of hydrolytic condensation products of monofunctional silane (M units) and tetrafunctional silane (Q units). In this work, a Bio-Phenol MQ silicone resin (BPMQ) was designed and synthesized by the hydrosilylation of hydrogen containing MQ silicone resin and eugenol in the presence of chloroplatinic acid. The structure, thermal property, and antibacterial property againstEscherichia coliof the modified MQ silicone resin were investigated. The results showed that BPMQ has been prepared successfully, and the thermal stability of this modified polymer improved significantly because of the introduction of phenyl in eugenol. The temperature at the maximum degradation rate increased from 250 °C to 422.5 °C, and the residual yields mass left at 600 °C were increased from 2.0% to 28.3%. In addition, its antibacterial property againstEscherichia coliwas also enhanced markedly without adding any other antimicrobial agents. This improved performance is ascribed to special functional groups in the structure of eugenol. The BPMQ polymer is expected to be applied to pressure-sensitive adhesives and silicone rubber products for the biomedical field due to its reinforcing effect and antioxidant quality.Keywords:Bio-Phenol MQ silicone resin;hydrosilylation;modified;thermal stability;antibacterial property
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 6
·e4874
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IF 3.259
Yingpeng Huo,Jiwen Hu,Shudong Lin,Xingming Ju,Yanlong Wei,Zhenzhu Huang,Yangfei Hu,Yuanyuan Tu
Reported herein is an easy-to-prepare novel heterogeneous catalyst of platinum complexes bearing binary ligands of bidentate naphthalenolimine and cyclo-1,5-octadiene that are anchored onto mesoporous silica SBA-15. The presence of the binary ligands not only stabilized the platinum, but also enabled the platinum atoms to form nanoclusters with diameters of ca 1 nm, and led to high platinum loading (8.69 wt%). Moreover, the platinum catalyst exhibited high catalytic activity towards hydrosilylation of terminal alkenes and styrene with silanes under mild and solvent-free conditions, with excellent regioselectivity.
研究领域:
催化
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材料科学
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无机化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jinfang Kou,Jian Fang,Jianfeng Li,Huacheng Zhao,Mengmeng Gao,Gong Zeng,Wei David Wang,Fengwei Zhang,Jiantai Ma,Zhengping Dong
Selective catalytic hydrosilylation of alkenes for the synthesis of organosilicon products is very important in the fine chemical industry. Nevertheless, conventional Pt-based homogeneous catalysts are hindered by their low reaction selectivity, catalyst residues, and Pt leaching. In this study, a series of covalent organic frameworks (COFs)-anchored single-site Pt catalysts for achieving high-performance alkene hydrosilylation were prepared, and comprehensive characterizations confirmed that the actual coordination environment of Pt active sites is NS-Pt-Cl 2 . The resulting Pt(0.75%)@BTT-BPh-COF catalyst exhibited superior activity for the anti-Markovnikov hydrosilylation of alkenes with an excellent selectivity (>99%) under solvent-free conditions. Experimental and theoretical analysis revealed that the excellent catalytic performance is attributed to the effective charge transfer and strong coordination effect between Pt and S, N-co-doped COFs, which is conducive to the generation of electron-rich and highly active Pt single sites. High catalyst stability was maintained during recycling experiments due to the strong anchoring effect of the COFs support on atomically dispersed Pt single sites as well as the pore confinement effect. This study not only describes the precise design for the state-of-the-art catalysts with accurate active sites but also affords in-depth insights into alkene hydrosilylation.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2020
·Vol. 26
·期 24
·5494-5499
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IF 4.857
Xiaojuan Liu,Qingqing Wen,Li Xiang,Xuebing Leng,Yaofeng Chen
Graphical A five-coordinate samarium(II) monoalkyl complex is synthesized and structurally characterized. This complex shows high catalytic activity and high stereo- and regioselectivity in the hydrosilylation of various aryl and methyl-substituted unsymmetrical internal alkynes with secondary hydrosilanes under mild conditions (see scheme). The synthesis and catalytic applications of trivalent rare-earth metal alkyl complexes have been well developed, but the chemistry of divalent rare-earth metal alkyl complexes lagged much behind. Herein, we report the synthesis, structure, and catalytic applications of a samarium(II) monoalkyl complex supported by a β-diketiminato-based tetradentate ligand, [LSmCH(SiMe 3 ) 2 ] (L=[MeC(NDipp)CHC(Me)NCH 2 CH 2 N(Me)CH 2 CH 2 NMe 2 ] − , Dipp=2,6-( i Pr) 2 C 6 H 3 ). This complex is synthesized by the salt metathesis reaction of samarium iodide [LSm( μ -I)] 2 and KCH(SiMe 3 ) 2 in 63 % yield. Its structure is characterized by single-crystal X-ray diffraction, showing a distorted square-pyramid coordination geometry. This samarium(II) monoalkyl complex exhibits high catalytic activity in the hydrosilylation of aryl and methyl-substituted unsymmetrical internal alkynes with secondary hydrosilanes, selectively providing the α-( E ) products in high yields.
研究领域:
化学
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催化材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Futing Li,Youxin Li
A novel catalyst by preparing silica supported ethylenediaminetetraacetic acid (EDTA) platinum complex was developed. The preparation conditions, such as heating temperature and solvent types, were optimized. The catalyst was phosphine-free and sulfur-free which was characterized by infrared spectroscopy (IR), energy dispersive X-ray spectrometer (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), ultraviolet spectroscopy (UV) and atomic absorption spectroscopy (AAS). Its catalytic activity was evaluated by catalyzing solventless hydrosilylation reactions. In the hydrosilylation reaction between 1-hexene and methyldicholosilane, the new catalyst showed a higher catalytic activity than that provided by Spiere’s catalyst. Moreover, the new catalyst could be reused for 12 times without obvious loss of catalytic activity. To confirm its practical feasibility, catalyzing the hydrosilylation reaction between 1-octene and methyldichlorosilane was performed. Our results indicated that the new catalyst can efficiently catalyze the hydrosilylation reaction.
研究领域:
化学
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材料科学
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催化反应
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产品关联
DOI
高影响因子
Molecular Catalysis
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2023
·
IF 4.6
Rong Wang,Shuhuai Liang,Jinhua Zhu,Mei Luo,Hailong Peng,Ronghui Shi,Wang Yin
Alkylsilanes, obtained from hydrosilylation of alkenes with tertiary silane, have high commercial application value. It is crucial to develop a heterogeneous Pt-based catalyst with high activity and high regioselectivity to catalyze this hydrosilylation reaction under solvent-free and mild conditions. Herein, a stable Pt(II)-vinyl complex with unique structure was successfully constructed on oxidized rice straw biochar through reasonable structural design and modification steps. Pt particles on the as-prepared catalyst (Pt-VTES-RSOC) were evenly dispersed with relatively minimum particle sizes (0.3∼2.5 nm). Compared to classic homogeneous catalysts, Pt-VTES-RSOC showed superior activity, great regioselectivity for tertiary silanes and high reusability. The apparent kinetic models for representative reactions over Pt-VTES-RSOC were also proposed to simulate the catalytic process under suggested reaction conditions for clarifying the reaction mechanism. The study proved that Pt-VTES-RSOC would have a good industrial application potential in hydrosilylation of alkenes with tertiary silanes by reducing operation cost and increasing the product quality.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 18
·3704
·
IF 4.6
Jing Zhou,Qiqi Zhang,Mengying Wang,Zongmu Xiao,Yixin Zhang
The design and development of low-cost and efficient nonhomogeneous catalysts for silicon hydrogen addition is a hot research topic. This study reports the synthesis of a novel solid catalyst, PtCu-NVF-HBNC, derived from hazelnut shell biomass waste. The catalyst was prepared through carbonisation, nitrogen-doped activation, functionalisation with N-vinylformamide (NVF), and subsequent bimetallic Pt–Cu loading. It features a divalent platinum–vinylamine complex as the active centre. The introduction of Cu as a promoter induces competitive coordination with the Pt(II)–vinylamine complex, leading to electron density redistribution on the vinylamine ligand and a significant enhancement in Pt(II) coordination bond strength. This electronic modulation results in markedly improved activity and regioselectivity in the hydrosilylation of alkenes with tertiary silanes. The optimised catalyst, Pt1.6Cu-NVF-HBNC, demonstrated high performance in the hydrosilylation of linear alkenes, including 1-hexene, 1-octene, and 1-octadecene with triethoxysilane, indicating broad substrate adaptability.
研究领域:
催化化学
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材料化学
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有机金属化学
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绿色化学
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可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Feihong Ye,Liping Li,Jianyin Xu,Lu Zhou
Synthesization of 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane through solvent-free hydrosilylation of 1H,1H,2H-perfluoro-1-octene with trimethoxysilane was efficiently conducted over the RuCl 3 ·3H 2 O catalyst. The synergistic action of Ru 3+ as the active center and the strong electronegativity of Cl − to attract the electron of the electron-donating group –OCH 3 in trimethoxysilane, activated the Si-H and thus promoted the reaction. The influences of different reaction conditions including feed order, feed ratio, catalyst dosage, reaction temperature and reaction time on the reaction yield were fully investigated, to conclude the optimized condition to achieve a yield of 86.80% was the feed of 1.2 mol trimethoxysilane per mole of 1H,1H,2H-perfluoro-1-octene, together with the addition of 9.56 × 10 −4 mol RuCl 3 ·3H 2 O per mole of trimethoxysilane, at 80 °C for 4 h; while the additive of CuCl to RuCl 3 ·3H 2 O catalyst could further improve the reaction yield at 50℃. Finally, after understanding the activity of Ru with different valence state, the reaction mechanism was also proposed.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Jinhua Zhu,Rong Wang,Shipeng Zhang,Xiaoyan Xie,Mei Luo,Hailong Peng,Yude Liu,Ronghui Shi,Wang Yin
A bimetallic PtNi-vinyl complex as catalytic active center was created on modified rice straw biochar by introducing an appropriate amount of cheap Ni component as a catalytic promoter. The constructed bimetallic catalyst (PtNi-VTES-RSOC) was used to catalyze hydrosilylation of terminal alkenes with tertiary silanes to produce alkylsilanes with high commercial application value. The experimental results proved that the conversion of 1-octene 96.5 % and selectivity for target product 97.1 % were obtained in hydrosilylation of 1-octene with triethoxysilane catalyzed by PtNi-VTES-RSOC with mass ratio of Pt/Ni = 1.5:1 (molar ratio of Pt/Ni≈1:2) under mild conditions (atmospheric pressure, solvent-free, 50 ℃ and 3 h). It also possessed higher catalytic ability and regioselectivity for hydrosilyation of long-chain alkenes (1-octadecene) with tertiary silanes compared to the counterpart monometallic catalysts. The characterization and theoretical calculation results demonstrated that the introduced suitable amount of Ni(II) could affect the structure of original Pt(II)-vinyl complexes and form a stable and unique bimetallic vinyl coordination microstructure by using a shared vinyl group, thereby affecting morphology, structure, and catalytic performance of the as-prepared bimetallic catalyst with mass ratio of Pt/Ni = 1.5:1. Changing the introduction order and introducing excessive or insufficient of Ni(II) would both disrupt the formation of this special structure and affect the catalytic performance. Additionally, the formed stable complex structure with vinyl groups could well maintain the catalytic stability. The study results exposed that the as-prepared bimetallic catalyst would possess a great industrial application potential in the hydrosilylation of alkenes by efficiently increasing the product quality and reducing operation cost.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Xiao-Yu Zhan,Hua Zhang,Yu Dong,Jian Yang,Shuai He,Zhi-Chuan Shi,Lei Tang,Ji-Yu Wang
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies revealed that hexafluoro-2-propanol also served as a hydrogen source in the process.
研究领域:
有机化学
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催化化学
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合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）