检索结果-南通市图书馆

Handedness-inverted polymorphic helical assembly and circularly polarized luminescence of chiral platinum complexes

Science China Chemistry 2021年第5期64卷 788-799页

作者： zhong-liang gong Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Circularly polarized luminescence(CPL)materials have potential applications in three-dimensional(3D)displays,quantum encryption,and optical *** development of single-component CPL materials with polymorphic assembly and handedness inversion remains a significant ***,we present the access of such materials by controlling the underlying assembly pathway of well-designed chiral emitters.A pair of enantiomeric platinum complexes(R)-1 and(S)-1 decorated with a chiralα-methylbenzyl isocyanide ligand were *** using the mixed-solvent(THF/n-hexane,THF=tetrahydrofuran)or high-concentration condition,these complexes were found to assemble via a cooperative or isodesmic pathway with significantly enhanced yellow or red emission,*** aggregate samples obtained via these conditions show efficient CPL(dissymmery factor|glum|>0.02,emission quantum yieldΦ>20%).Interestingly,different assembly pathway leads to helical nanoribbons or nanofibers with opposite handedness from the complex with the same molecular *** has been unambiguously and consistently manifested by circular dichroism and CPL spectral analysis and transmission electron,scanning electron,and atomic force microscope *** work demonstrates an appealing example of constructing polymorphic helical architectures with highly efficient CPL and inverted handedness thanks to the excellent assembly and emission of platinum complexes.

关键词： self-assembly nanostructures circularly polarized luminescence chiral materials platinum complexes

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

Urea-bridged diferrocene: structural, electrochemical, and spectroelectrochemical studies

引用

Science China Chemistry 2015年第9期58卷 1444-1450页

作者： zhong-liang gong Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences

Urea-bridged diferrocene derivatives N,N?-diferrocenylurea(1) and N,N?-dimethyl-N,N?-diferrocenylurea(2) were prepared and characterized. Single-crystal X-ray analysis shows that Compound 1 has a trans-trans linear conformation whereas Compound 2 has a trans-cis conformation. Both compounds display two consecutive redox couples with, respectively, E1/2 of +0.29 and +0.42 V vs. Ag/Ag Cl for 1 and +0.31 and +0.50 V for 2. Spectroelectrochemical studies show the presence of distinct intervalence charge transfer(IVCT) transitions for the one-electron-oxidized mixed-valent Compound 1+, with an estimated electronic coupling parameter of 190 cm?1. By contrast, the one-electron-oxidized Compound 2+ shows much weaker IVCT transitions.

关键词： mixed-valent compounds ferrocene electrochemistry urea spectroelectrochemistry

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

New insight into hydrogen bond-mediated electron transfer

引用

Science China Chemistry 2019年第8期62卷 927-928页

Electron transfer (ET) is one of the most fundamental processes in nature, biological systems, and optoelectronic devices. The in-depth ET investigations of synthetic materials are of great significance for the understanding of those occurring in natural systems. Mixed-valence (MV) compounds, consisting of two bridged redox motifs that are structurally identical but different in valence, provide an appealing platform for this purpose [1]. To date, a vast number of MV compounds have been synthesized and examined. However, successful or even partially successful examples of MV compounds with efficient electronic coupling and ET through a hydrogen bond are very limited [2,3]. The difficulty in building hydrogen bond-bridged MV compounds is mainly caused by the dynamic nature and elusive chargetransporting property of hydrogen bond and its decreased stability upon redox reactions.

关键词： New insight transfer stability

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

Circularly polarized phosphorescence and photon transport of micro/nanocrystals of ruthenium and iridium complexes with chiral anions

引用

Science China Chemistry 2023年第10期66卷 2892-2902页

作者： zhong-Qiu Li zhong-liang gong Tongling liang Stefan Bernhard Yu-Wu zhong Jiannian Yao Beijing National Laboratory for Molecular Sciences(BNLMS) CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Chemistry Carnegie Mellon UniversityPittsburghPennsylvania 15213USA

Materials with efficient circularly polarized phosphorescences(CPPs) are of potential use in advanced data encryption and anticounterfeiting, bioimaging, optoelectronic devices and so forth. Herein, a simple method is presented for the preparations of CPP-active micro/nanocrystals with large luminescence dissymmetry factors(glum), high phosphorescence quantum efficiencies(Φ_(P)) and tunable emission colors. Diastereomeric Ir^(Ⅲ) and Ru^(Ⅱ) complexes with chiral(±)-camphorsulfonate counter-anions are readily synthesized and assembled into crystalline microrods, microplates or nanofibers with ordered morphologies. The chirality information of chiral counter-anions is efficiently transferred to the metal components to afford CPPs with cyan, green,yellow, or red emission colors and Φ_(P)in the range of 5%–85%. The number of chiral anions is found to play a role in influencing the CPP magnitudes of these crystals. The dicationic Ru^(Ⅱ) and tricationic Ir^(Ⅲ) complexes show glumvalues in the 10^(-2)order, which are much larger with respect to those of monocationic Ir^(Ⅲ) complexes. Single crystal X-ray analysis is performed to obtain information on the chirality transfer of these materials. In addition, circularly polarized photonic signal waveguiding is demonstrated using the microcrystals of an Ir^(Ⅲ)complex. This work demonstrates an appealing strategy of constructing chiral micro/nano-architectures for potential applications in chiral nanophotonics.

关键词： circularly polarized luminescence transition metal complexes chirality transfer micro/nanocrystals photon transport

来源：

维普期刊数据库

同方期刊数据库

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

Circularly polarized luminescence of coordination aggregates

Aggregate

引用

Aggregate 2022年第5期3卷 82-99页

作者： zhong-liang gong zhong-Qiu Li Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina

The development and applications of materials with efficient circularly polarized luminescence(CPL)have become an interdisciplinary frontier research *** summarize herein the recent advance in the development and applications of CPLactive aggregates based on metal-ligand coordination materials(termed as“coordination aggregates”).The materials surveyed are classified as aggregates of smallmolecular metal complexes,which include monocomponent assemblies of Pt(II)complexes and other complexes and binary aggregates of metal complexes,and CPL-active metal-ligand coordination helicates,polymers,and *** efforts in improving the dissymmetry luminescence factors and quantum yields of these materials and the use of the aggregation strategy in enhancing the performance of isolated molecules are *** recent applications of chiral metal complexes in circularly polarized organic light-emitting diodes(OLEDs)based on solution-or evaporation-processed procedures are *** addition,the uses of lanthanide complexes in CPL-contrast imaging and as CPL probes are *** common discussion on the mechanism of aggregation-enhanced CPLs and a perspective on future works of CPL-active coordination aggregates are finally given.

关键词： chiral metal complexes circularly polarized luminescence coordination helicates and polymers liquid crystals metal-organic frameworks supramolecular assemblies

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 Star-Shaped Solvatofluorochromic Pyrene-Triarylamine Derivative as a Fluorescent Thermometer over a Wide Temperature Range

引用

Chinese Journal of Chemistry 2020年第12期38卷 1515-1520页

作者： Tian-Ge Sun zhong-liang gong Jiang-Yang Shao Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

of main observation and conclusion A star-shaped compound 1 with a pyrene core and four triarylamine arms has been prepared and *** exhibits intense intramolecular-charge-transfer(ICT)emissions with strong *** the basis of the temperature-dependent emission color and wavelength changes,compound 1 behaves as a fluorescent thermometer between 200 and 400 Kwith a high *** comparison,model compounds with one or two triarylamine arms show distinctly lower thermosensitivity.

关键词： compound conclusion intense

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 pre-organized monomer-reservoir strategy to prepare multidimensional phosphorescent organoplatinum nanocrystals and suprastructures

引用

Science China Chemistry 2022年第2期65卷 328-338页

作者： Rui Li zhong-liang gong Qijian Zhu Meng-Jia Sun Yanke Che Jiannian Yao Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

The preparation of multidimensional nano-and microstructures,in particular suprastructures with well-defined morphology and bright emissions,is a challenging task in supramolecular *** this purpose,a new type of amphiphilic diplatinum complexes is presented as an excellent building block to assemble into highly phosphorescent nanofibers by supramolecular Pt…Pt *** organoplatinum supramolecular fibers are further used as a pre-organized monomer reservior for the metal ion-triggered post-transformation into crystalline nanoneedles,nanorods,nanobunches,microplates,and microflowers with controllable morphology and bright phosphorescence.A reverse transformation of the obtained nanorods into nanofibers is demonstrated with the aid of ethylenediamine tetraacetic *** contrast,the direct treatment of diplatinum complexes with different metal ions fails to give well-defined nano and microstructures,suggestive of the pre-organized role of nanofibers for the morphological *** applications of these nano-and suprastructures in sensing temperature and organic vapours by emission signal changes are *** contrast to the conventional hierarchical assembly,the pre-organized monomer-reservoir strategy disclosed in this study offers a versatile method for the synthesis of organic nano and suprastructures with multidimensional morphology and controllable emission properties.

关键词： self-assembly nanostructures phosphorescence amphiphilic molecules platinum complexes

来源：

维普期刊数据库

同方期刊数据库

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

Wavelength-Tunable Single-Mode Microlasers Based on Photoresponsive Pitch Modulation of Liquid Crystals for Information Encryption

引用

Research 2020年第1期2020卷 1044-1052页

作者： Fa-Feng Xu zhong-liang gong Yu-Wu zhong Jiannian Yao Yong Sheng Zhao Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Information encryption and decryption have attracted particular attention;however,the applications are frequently restricted by limited coding capacity due to the indistinguishable broad photoluminescence band of conventional stimuli-responsive fluorescent ***,we present a concept of confidential information encryption with photoresponsive liquid crystal(LC)lasing materials,which were used to fabricate ordered microlaser arrays through a microtemplate-assisted inkjet printing *** microlasers exhibit narrow-bandwidth single-mode emissions,and the wavelength of LC microlasers was reversibly modulated based on the optical isomerization of the chiral dopant in *** this basis,we demonstrate phototunable information authentication on LC microlaser arrays using the wavelength of LC microlasers as primary *** results provide enlightenment for the implementation of microlaser-based cryptographic primitives for information encryption and anticounterfeiting applications.

关键词： dopant template lasing

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

Electropolymerized films of redox-active ruthenium complexes for multistate near-infrared electrochromism,ion sensing,and information storage

引用

Chinese Chemical Letters 2016年第8期27卷 1105-1114,1464页

作者： Jiang-Yang Shao Chang-Jiang Yao Bin-Bin Cui zhong-liang gong Yu-Wu zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of SciencesBeijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

This paper summarizes our recent progress on the preparations and applications of electropolymerized thin films of redox-active ruthenium *** films of vinyl-functionalized diruthenium or ruthenium-amine conjugated complexes are prepared by reductive *** resulting films are useful for multistate near-infrared electrochromism,ion sensing,and mimicking flip-flop and flip-flap-flop logic *** oxidative electropolymerization of diruthenium complexes with two distal triarylamine units affords electropolymers with an alternating diruthenium and tetraphenylbenzidine structural *** applications of the resulting films in multistate near-infrared electrochromism and resistive memory are discussed.

关键词： Electropolymerization Ruthenium complexes Electrochromism Thin films Molecular memory

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

Synthesis and electrochemical and spectroscopic studies of a N,N,N＇,N＇- tetraphenylbenzidine-bridged bis(2,2＇-bipyridine) ligand and diruthenium complex

引用

Chinese Chemical Letters 2018年第3期29卷 385-389页

作者： Jun Feng Jiang-Yang Shao Hai-Jing Nie zhong-liang gong Yu-Wu zhong CAS Key Laboratory of Photochemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Belting 100190 China University of Chinese Academy of Sciences Beijing 100049 China

A N,N,N＇,N＇-tetraphenylbenzidine-bridged bis（2,2＇-bipyridine） ligand and corresponding diruthenium complexes were synthesized and characterized. They show rich multistep redox processes due to the stepwise oxidations of the amine units and ruthenium components. Their absorption and emission spectral changes in response to electrochemical stimulus were examined by spectroelectrochemical measurements. DFT and TDDFF calculations were performed to complement the experimental results.

关键词： Ruthenium Spectroelectrochemistry Electrochromism Redox-active compounds Bipyridine

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

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

在线全文

在线全文

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

在线全文

在线全文

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：