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Electric field controlled superlubricity of fullerene-based host–guest assembly

Nano Research 2023年第1期16卷 583-588页

作者： Shanchao Tan Hongyu Shi Xin Du Kunpeng Wang Haijun Xu Junhua Wan Ke Deng Qingdao Zeng Yuhong Liu State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China College of Chemical Engineering Jiangsu Key Lab of Biomass-based Green Fuels and ChemicalsNanjing Forestry UniversityNanjing 210037China Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal UniversityHangzhou 310012China Center of Materials Science and Optoelectonics Engineering University of Chinese Academy of SciencesBeijing 100049China

Controlling friction by the electric field is a promising way to improve the tribological performance of a variety of movable mechanical *** this work,the assembly structure and microscale superlubricity of a host–guest assembly are effectively controlled by the electric *** the help of the scanning tunneling microscopy(STM)technique,the host–guest assembly structures constructed by the co-assembly of fullerene derivative(Fluorene-C60)with macrocycles(4B2A and 3B2A)are explicitly *** with density functional theory(DFT),the distinct different assembly behaviors of fullerene derivatives are revealed at different probe biases,which is attributed to the molecular polarity of the fullerene *** the control on the adsorption behavior,the friction coefficient of host–guest assembly is demonstrated to be controllable in the electric field by using atomic force microscopy(AFM).At positive probe bias,the friction coefficient of the host–guest assembly is significantly reduced and achieves superlubricity(μmin=0.0049).The efforts not only help us gain insight into the host–guest assembly mechanism controlled by the electric field,but also promote the further application of fullerene in micro-electro-mechanical systems(MEMS).

关键词： superlubricity electric field friction control fullerene derivative host-guest assembly

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Pillar[5]arene and Azine Derivative assembly Improved Dual-Channel Detection of CN^(-)

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Chinese Journal of Chemistry 2024年第20期42卷 2471-2478页

作者： Qing-Ling Su Jin-Fa Chen Xiao-Mei Sun Juan Liu Xin-Yu Dai Tai-Bao Wei Hong Yao Qi Lin Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-environmental Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhouGansu 730070China Key Laboratoryof Environment-Friendly Composite Materials of the State Ethnic Affairs Commission Gansu Provincial Biomass Function Composites Engineering Research CenterCollege of Chemical EngineeringNorthwest Minzu University(Northwest Universityfor Nationalities)Xibei XincunLanzhouGansu 73000oChina

The cyanide anion(CN^(–))is known to be one of the most toxic ***,there is an urgent need to develop a reliable,sensitive,selective,rapid and effective method for the detection of CN^(–).Here,a self-assembly strategy based on pillar[5]arene P5 and azine derivative AZ was used to construct supramolecular sensors,and it was found that the detection effect of CN^(–)was significantly improved by the assembly *** sensitivity of the assembled sensor P5-AZ to CN^(–)is more than 10 times higher than that of *** detect mechanism was further investigated by theoretical calculations and 1H *** results showed that AZ detects CN–by a deprotonation process with fluorescence enhancement,while P5-AZ improves the sensitivity of CN^(–)recognition through hydrogen bonding,anion-πand anion-dipole interactions,as well as the strong bonding ability of the *** assembly P5-AZ has the advantages of low toxicity,high sensitivity,and more importantly,it provides a method to detect CN^(–)sensitivity in the aqueous phase and organisms by host-guest assembly.

关键词： host-guest assembly Improves sensing sensitivity Pillararene Azine derivative Cyanide Supramolecular sensors Energy transfer Colorimetric fluorescence dual-channel Fluorescence cell imaging

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Recent advances in room-temperature phosphorescent materials by manipulating intermolecular interactions

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Science China Chemistry 2023年第2期66卷 304-314页

作者： Liangwei Ma Xiang Ma Key Laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai200237China

Metal-free room-temperature phosphorescence(RTP)materials have the characteristics of large Stokes shift,long lifetime,and triplet state *** exhibit application potential in various fields,such as bioimaging,computer display,sensor,and anticounterfeiting and have drawn much research *** work showed that manipulating intermolecular interactions(e.g.,crystallization,polymerization,and rigid matrix)and host-guest assembly to restrain nonradiative transitions and isolate phosphor from oxygen as much as possible is a feasible way to obtain various types of efficient RTP *** some cases,intermolecular interactions also facilitated RTP emission by regulating the triplet *** the other hand,heavy atoms(Br,I,etc.),heteroatoms(N,O,S,etc.),or carbonyls were introduced to the molecular skeleton through molecular engineering to enhance intersystem crossing,which is important for populating the triplet *** comprehensively using the aforesaid strategies,great progress has been made for RTP *** this mini-review,we summarized recent advances in organic RTP materials based on manipulating intermolecular *** host-guest assembly,hydrogen-bond assembly,energy transfer process,and exciplex emission system-based RTP materials were well *** summary,the current challenges and prospects for development in this field were presented.

关键词： room-temperature phosphorescence host-guest assembly energy transfer exciplex supermolecule

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