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ligand-free CsPbBr_(3) with calliandra-like nanostructure for efficient artificial photosynthesis

Journal of Energy Chemistry 2023年第2期77卷 317-325,I0009页

作者： Yan-Fei Mu Hui-Ling Liu Meng-Ran Zhang Hong-Juan Wang Min Zhang Tong-Bu Lu MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009JiangsuChina

The low-efficiency CO_(2) uptake capacity and insufficient photogenerated exciton dissociation of current metal halide perovskite(MHP)nanocrystals with end-capping ligands extremely restrict their application in the field of artificial photosynthesis.Herein,we demonstrate that ligand-free CsPbBr_(3) with calliandralike nanostructure(LF-CPB CL)can be synthesized easily through a ligand-free seed-assisted dissolutionrecrystallization growth process,exhibiting significantly enhanced CO_(2) uptake capacity.More specifically,the abundant surface bromine(Br)vacancies in ligand-free MHP materials are demonstrated to be beneficial to photogenerated carrier separation.The electron consumption rate of LF-CPB CL for photocatalytic CO_(2) reduction increases 7 and 20 times over those of traditional ligand-capping CsPbBr_(3)nanocrystal(L-CPB NC)and bulk CsPbBr_(3),respectively.Moreover,the absence of ligand hindrance can facilitate the interfacial electronic coupling between LF-CPB CL and tetra(4-carboxyphenyl)porphyrin iron(Ⅲ)chloride(Fe-TCPP)cocatalyst,bringing forth significantly accelerated interfacial charge separation.The LF-CPB CL/Fe-TCPP exhibits a total electron consumption rate of 145.6μmol g^(-1) h^(-1) for CO_(2)photoreduction coupled with water oxidation which is over 14 times higher than that of L-CPB NC/FeTCPP.

关键词： Artificial photosynthesis Charge separation Halide perovskite ligand-free Vacancy defect

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Copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids under ligand-free or both ligand-and base-free conditions

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Chinese Chemical Letters 2016年第4期27卷 571-574页

作者： Ying-Wei Zhao Qiang Feng Qiu-Ling Song Institute of Next Generation Matter Transformation College of Chemical Engineering Huaqiao University

An efficient copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids with bis（pinacolato）diboron was developed, affording b-vinylboronates as the only products in high yields. Extra hydrogen sources such as methanol are not needed in this catalytic system. This reaction could be performed successfully under ligand- and base-free conditions. It demonstrated that phenylpropiolic acids can be employed as alkyne synthons in the hydroboration reaction and exhibited good reactivity and higher selectivity than terminal alkynes.

关键词： Decarboxylation Hydroboration ligand-free Base-free Copper-catalysis

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Highly selective detection of copper(Ⅱ) by a “ligand-free” conjugated copolymer in nucleophilic solvents

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Frontiers of Chemical Science and Engineering 2020年第1期14卷 105-111页

作者： Weixing Deng Pengfei Sun Quli Fan Lei Zhang Tsuyoshi Minami Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&TelecommunicationsNanjing 210023China Institute of Industrial Science The University of TokyoMeguro-kuTokyo 153-8505Japan

The synthesis of N-cyclohexyl carbamate-attached fluorene-alt-phenylene copolymer(PFPNCC)and the use of PFPNCC as a“ligand-free”fluorescent chemosensor for Cu(Ⅱ)are described.Addition of Cu(Ⅱ)can efficiently quench the fluorescence of PFPNCC in nucleophilic solvents such as DMF and DMSO,but not in low nucleophilic solvents such as 1,4-dioxane and THF.Ultraviolet-visible spectra of the mixture of the conjugated polymer and Cu(Ⅱ)indicate the presence of a reduced Cu(Ⅰ)ion in the solution.Furthermore,fluorescence recovery of PFPNCC observed at low temperature suggests that the quenching and reducing mechanism is most probably due to a photo-induced electron transfer from excited PFPNCC to Cu(Ⅱ).Our findings provide a novel strategy for highly selective conjugated polymer-based chemosensors for various target analytes,albeit“ligand-free”.

关键词： ligand-free fluorescent chemosensor copper photo-induced electron transfer

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ligand-free Copper-catalyzed Synthesis of Symmetrical Diynes from 1,1-Dibromo-1 -alkenes

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Chinese Journal of Chemistry 2011年第3期29卷 592-594页

作者： Jin, Hui Kuang, Chunxiang Department of Chemistry Tongji University Shanghai 200092 China

Symmetrical diynes were synthesized by ligand-free copper-catalyzed homocoupling reaction of 1,1-dibromo-1- alkenes using a DBU/DMSO system at room temperature in good to excellent yields.

关键词： symmetrical diynes copper-catalyzed 1,1-dibromo-l-alkenes ligand-free homocoupling

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Angular dependence of nanoparticle generation in the matrix assembly cluster source

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Nano Research 2019年第12期12卷 3069-3074页

作者： Maria Chiara Spadaro Junlei Zhao William D.Terry Jian Liu Feng Yin Flyura Djurabekova Richard E.Palmer College of Engineering Swansea UniversityBay CampusFabian WaySwansea SAI 8ENUK Department of Physics and Helsinki Institute of Physics University of HelsinkiP.O.Box43f FIN-00014HelsinkiFinland Nanoscale Physics Research Laboratory School of Physics and AstronomyUniversity of BirminghamBirmingham B152TTUK National Center for Electron Microscopy in Beijing Key Laboratory cf Advanced Materials(MOE)The State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Physics and Information Technology Shaanxi Normal UniversityXian 710062China Catalan Institute of Nanoscience and Nanotechnology(ICN2) CSIC and BISTCampus UABBellaterra08193 BarcelonaCataloniaSpain

The matrix assembly cluster source(MACS)represents a bridge between conventional instruments for cluster beam deposition(CBD)and thelevel of industrial production.The method is based on Ar^+ion sputtering of a pre-condensed Ar-M matrix(where M,is typically a metal such asAg).Each Ar^+ion produces a collision cascade and thus the formation of metal clusters is in the matrix,which are then sputtered out.Here wepresent an experimental and computational investigation of the cluster emission process,specifically its dependence on the Ar^+ion angle of in cidence and the cluster emission angle.We find the in cide nee angle strongly in flue nces the emerging cluster flux,which is assigned to thespatial location of the deposited primary ion energy relative to the cluster into the matrix.We also found an approximately constant anglebetween the incident ion beam and the peak in the emitted cluster distribution,with value between 99°and 109°.

关键词： cluster beam deposition scale-up nano particles silver ligand-free green synthesis

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Acid-DDQ Assisted Chemoselective Oxidative Heck Reaction With Unactivated Alkenes under Ball Milling : Synthesis of Arylolefins and Diarylolefins

Acid-DDQ Assisted Chemoselective Oxidative Heck Reaction Wit...

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中国化学会·第十五届全国有机合成化学学术研讨会

作者： Haowen Shou 俞静波 Weike Su National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology 浙江工业大学

The oxidative Heck reaction is one of the most direct coulping methodology for the formation of carbon-carbon bond, which is vital in the synthesis of complex organic molecules. Despite momentous progress, the restrict of substrate scope, in particular noncompliance of unactivated alkenes, and require of highly active ligands are greatly limited the versatility and applicability of this reaction, [2-3] which indicates that there is a demand for an efficient and green synthesis.In this work, we disclosed a mechanochemically promoted solvent-free and ligand-free reaction of aryl boric acids with unactivated alkenes.When the reaction was carried out in the presence of Pd(Ⅱ) and stoichiometric acid under an air atmosphere, arylolefins were given as sole products.Whereas, unexpected diarylolefins were separated as the main products using 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone(DDQ) as additive.The reaction chemoselectivity could be efficiently controlled by evaluating the ratio of DDQ and acid, which proposed that acid helped to enhance the oxidation of air offering once-coupling product arylolefins, while adding DDQ under the presence of acid and Pd(Ⅱ) promoted the second coupling giving diarylolefins.Thereby, the acid-DDQ conditions provided access to challenging chemoselectivity control with ample substrate scope.

关键词： unactivated alkenes oxidative Heck reaction ligand-free solvent-free ball milling

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Highly Stable NiOx Nanocrystal for Efficient Flexible Perovskite Solar Cells

Highly Stable NiOx Nanocrystal for Efficient Flexible Perovs...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Enbing Bi Jinjin He Weiyu Kong Xudong Yang Han Chen Liyuan Han School of Materials Science and Engineering Shanghai Jiao Tong University

Inverted configuration perovskite solar cells containing a NiOx layer fabricated by using a low-temperature process have yielded highly efficient, flexible devices. However, the ligands such as hydroxyl functional groups on NiOx prepared by low-temperature processes can reduces the stability of the devices;We report the inverted planar perovskite device(active area, 1.02 cm) based on high-quality, ligand-free NiOx nanocrystals, as the hole-transporting material exhibited a PCE of 18.49% and 15.89% on a rigid and flexible substrate, respectively. The devices retain 90% of their initial performance at 500 h in a damp‐heat test(85 ℃ and 85% relative humidity) due to free ligands on the NiOx surface, which degrade perovskite.

关键词： ligand-free hole-transporting material perovskite solar cell

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