检索结果-南通市图书馆

Green Synthesis and Catalysis 2022年第2期3卷 137-149页

作者： Biqiong Hong Lei Shi Lin Li Shuming Zhan Zhenhua Gu College of Materials and Chemical Engineering Minjiang UniversityFuzhou 350108China Department of Chemistry University of Science and Technology of ChinaHefei 230026China

The dirhodium(II)-catalyzed organic reactions,including asymmetric transformation,are significantly benefitted from the discovery of simple and efficient protocols to introduce various bridging ligands,e.***.carboxylic acids,amide and phosphoric acids.ligands lying at axial position of dirhodium(II)complexes could strongly affect the activity and selectivity of these metal complexes involved reactions.This review summarizes the newly explored reactivity of dirhodium(II)complexes with N-heterocyclic carbenes or phosphines as the axial ligands.The asymmetric tries are also highlighted,where their stereo-induction were solely from the axial ligand of dirhodium(II)complexes.In the last part,the reactions catalyzed by inherent chiral ortho-metalated dirhodium(II)/phosphine complexes are also discussed.

关键词： Dirhodium(II) axial ligand NHC carbene Phosphine Enantioselectivity Remote control

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

P-functionalized carbon nanotubes promote highly stable electrocatalysts based on Fe-phthalocyanines for oxygen reduction: Experimental and computational studies

引用

Journal of Energy Chemistry 2022年第9期31卷 276-290,I0008页

作者： Beatriz Martinez-Sanchez Diego Cazorla-Amors Emilia Morallon Departamento de Quimica Fisica and Instituto Universitario de Materiales de Alicante(IUMA)University of Alicante Ap.99.03080 AlicanteSpain Departamento de Quimica Inorganica and Instituto Universitario de Materiales de Alicante(IUMA) University of AlicanteAp.9903080 AlicanteSpain

Iron(Ⅱ) phthalocyanines(FePc) supported on functionalized nanostructured carbon materials have been studied as electrocatalysts for the oxygen reduction reaction(ORR) in an alkaline medium. Herein, two types of carbon nanotubes(CNTs) have been explored as support, Single-Walled Carbon Nanotubes and Herringbone Carbon Nanotubes(SWCNTs and h CNTs, respectively), both electrochemically modified with ortho-aminophenylphosphonic acid(2APPA), which provides phosphate axial coordinating ligands for the immobilization of FePc molecules. All the catalysts were prepared via a facile incipient wetness impregnation method. Comprehensive experimental analysis together with density functional theory(DFT) calculations has demonstrated both the importance of the five-coordinated Fe macrocycles that favor the interaction between the FePc and the carbon support, as well as the effect of the CNT structure in the ORR. FePc axial coordination provides a better dispersion, leading to higher stability and a favorable electron redistribution that also tunes the ORR performance by lowering the stability of the reaction intermediates. Interestingly, such improvement occurs with a very low content of metal(~1 wt% Fe),which is especially remarkable when h CNT support is employed. This work provides a novel strategy for the development of Fe-containing complexes as precious metal-free catalysts towards the ORR.

关键词： Carbon nanotubes Iron phthalocyanine Oxygen reduction Electrocatalysis axial ligand

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

DFT Studies on Second-order Nonlinear Optical Properties of a Series of axially Substituted Bis（salicylaldiminato） Zinc（II） Schiff-base Complexes

引用

Chemical Research in Chinese Universities 2015年第4期31卷 597-602页

作者： LIU Chunguang ZHANG Dingfan GAO Mingli LIU Shuang College of Chemical Engineering Northeast Dianli University Jilin 132012 P. R. China Institute of Functional Material Chemistry Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

Coordination of an axial ligand to metal center to enhance the second-order nonlinear optical（NLO） re- sponse of a two-dimensional bis（salicylaldiminato） zinc（II） Schiff-base complex is an unprecedented model. The second-order NLO responses of a series of axially substituted bis（salicylaldiminato） zinc（II） Schiff-base complexes were explored according to the finite field（FF） method at CAM-B3LYP/6-31＋G（d） level（LANL2DZ basis set for metal atoms）. The results show that the second-order NLO properties can be effectively tuned by exchanging the do- nor and accepter of the axial ligand and extending the length of the conjugated bridge along the axial direction. A system involving the electron acceptor along the appropriate direction has a large three-dimensional second-order NLO response. Meanwhile, time dependent density functional theory（TD-DFT） method was employed to calculate the physical parameters of excited states. The results show that the Y- and Z-polarized transitions of the zinc（II） Schiff-base complex are the first and second excited states, respectively, and have a low-lying excited energy. Al- though the X-polarized transition has a high excited energy, the large oscillator strength indicates that it will signifi- cantly contribute to the second-order NLO response.

关键词： Schiff base Zinc（II） complex Nonlinear optical property axial ligand Density functional theory

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Theoretical Study on Oxidation of Alkenes to Aldehydes catalysed by Ruthenium Porphyrins Using O2 as the Sole Oxidant

A Theoretical Study on Oxidation of Alkenes to Aldehydes cat...

引用

第十三届全国量子化学会议

作者： Linlin Zhang Xiangyun Wang Zhen Guo College of Material Science and Engineering Taiyuan University of Technology

The mechanism of ruthenium porphyrin-catalysed oxidation of styrene to access aldehyde has been comprehensively studied by a density functional theory（DFT） calculation. [1-3] The calculated results indicate that two reactive oxidants including ruthenium.oxo and ruthenium.superoxo were participated in the catalytic oxidation process,whereby the resultant monooxoruthenium porphyrin plays a vital role in tandem epoxide isomerization reaction to furnish aldehyde selectively as well as to generate bis-oxoruthenium porphyrin triggering new oxidation reaction cycles. In addition, the comparative oxidative abilities of ruthenium.oxo/superoxo with different axial ligands were established,suggesting that ruthenium.oxo/superoxo species bearing chloride axial ligand has the higher reactivity than it s counterpart with oxygen atom.

关键词： oxidation of alkenes ruthenium-oxo ruthenium-superoxo axial ligand

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：