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Plasmonic CsPbBr_(3)–Au nanocomposite for excitation wavelength dependent photocatalytic CO_(2) reduction

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Journal of Energy Chemistry 2021年第2期30卷 309-315,I0011页

作者： Jin-Feng Liao Ya-Ting Cai Jun-Yan Li Yong Jiang Xu-Dong Wang Hong-Yan Chea Dai-Bin Kuang MOE Key laboratory of bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510217GuangdongChina

The optoelectronic performance of CsPbBr_3 nanocrystal(NC) has been dramatically limited by the severe charge carrier recombination and its narrow light absorption range,which are anticipated to be resolved via coupling with plasmonic Au nanoparticle(NP).In view of this,CsPbBr_3-Au nanocomposite is fabricated and further employed as a concept model to study the electronic interaction between perovskite NC and Au NP for the first *** has been found that the excitation-wavelength dependent carrier transfer behavior exists in CsPbBr_3-Au *** illumination with visible light(λ>420 nm),photo-generated electrons in CsPbBr_3 can inject into Au with an electron injection rate and efficiency of 2.84×10~9 s^(-1) and 78%,*** boosted charge separation is further translated into a 3.2-fold enhancement in CO_2 photocatalytic reduction activity compared with pristine CsPbBr_*** the other hand,when solely exciting Au NP with longer wavelength light(λ>580 nm),the localized surface plasmon resonance(LSPR) induced hot electrons in Au NPs can transfer to CsPbBr_3 NC and further participate in photocatalytic reaction towards CO_2 *** present study provides new insights into preparing plasmonic nanostructure to enhance the performance of perovskite based optoelectronic devices.

关键词： Perovskite Gold nanoparticle Photocatalysis Localized surface plasmon resonance

Investigations on multi-photon emissions of Nd^3＋-sensitized core/shell nanoparticles

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Journal of Rare Earths 2017年第1期35卷 1-6页

作者： ZHANG Ge DONG Hao WANG Di SUN Lingdong YAN Chunhua Beijing National laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

The past few years witnessed extensive emergence of short-wavelength upconversion（UC） emission stimulated photoactivation studies. However, low efficiency of multi-photon process greatly limits further applications. Here, ultraviolet（UV） upconversion emissions originated from multi-photon process of Tm^3＋ were studied with Nd^3＋-sensitized NaGdF4：Yb,Tm@NaYF4：Nd,Yb core/shell nanoparticles. Crucial factors, including the contents of sensitizers Nd^3＋, Yb^3＋ and activator Tm^3＋, as well as the excitation power density were investigated based on the UV emission. Spectral results showed that high contents of Nd^3＋ in shell region up to 50%（molar fraction hereafter） and Yb^3＋ of 10% were essential to mediate the energy transfer via the core/shell interface and facilitate multi-photon UV emissions. Compared with segregated activator and sensitizer, a core/shell strategy with isolated Nd^3＋ in the shell was important for higher UV emission. Although the upconverting process was initiated with Nd^3＋→Yb^3＋, the short-wavelength emissions were intrinsically coming from four- and five-photon process. The optimized nanoparticles were found to be able to manipulate the configuration transition of azobenzene molecules, and it could be promising for near infrared（NIR） triggered optical switches applications.

关键词： Nd3+ sensitizer upconversion emission multi-photon core/shell nanoparticle rare earths

Antibacterial Behavior of Pyridinecarboxylatesilver（Ⅰ） Complexes

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Chinese Journal of Chemistry 2012年第7期30卷 1631-1635页

作者： Abarca, Romina Gomez, Grace Velasquez, Carla Paez, Maritza A. Gulppi, Miguel Arrieta, Abel Azocar, Manuell laboratory of bioinorganic Chemistry Faculty of Chemistry and Biology University of Santiago of Chile Av. Bernardo O'Higgins 3363 Santiago Chile

FT-1R spectroscopy of carboxylic groups and viability tests were useful to understand the antibacterial proper- ties of six highly efficient silver（I） pyridinecarboxylate （nicotinic, picolinic and isonicotinic acids） and bipiridinecarboxylate （pyridine-2,3-dicarboxylic, pyridine-2,4-dicarboxylic and pyridine-2,5-dicarboxylic acids） complexes with Ag--O and Ag--N bonds against E. coli （ATCC 25922） and Streptococcus＇ agalactiae （ISP 329-09）. The resuits show a tendency between the nature of Ag--X （X=oxygen and nitrogen） bonds and the rate or efficiency of antibacterial behavior.

关键词： silver complexes antibacterial Ag--O and Ag--N bonds FTIR

Thermal expansion behaviors of Mn(Ⅱ)-pyridylbenzoate frameworks based on metal-carboxylate chains

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Science China Chemistry 2014年第3期57卷 365-370,1-3页

作者： ZHOU HaoLong Li Mian LI Dan ZHANG JiePeng CHEN XiaoMing MOE Key laboratory of bioinorganic and Synthetic Chemistry School of Chemistry and Chemical Engineering Sun Yat-Sen University Department of Chemistry Shantou University

Solvothermal reactions of MnCl2with pyridylbenzoic acids gave three-dimensional metal-carboxylate frameworks(MCFs),named MCF-34,MCF-43,and MCF-44,based on one-dimensional Mn-carboxylate *** crystal structure,stability,porosity,and framework flexibility of the new compound MCF-44 were studied in detail and compared with its *** on their shapes and the bridging angles of the ligands,these compounds possess different network connectivities and *** the pyridylbenzote ligands and Mn(II)ions as,respectively,3-and 6-connected nodes,they resemble either the anatase(ant)or rutile(rtl)polymorph of ***-temperature single-crystal X-ray diffraction studies revealed large thermal expansion coefficients for these compounds,which are probably related to the relatively flexible edge-sharing polyhedral structure of their Mn-carboxylate ***,the new compound MCF-44,with its highly porous rtl structure exhibits the largest thermal expansion coefficienct among the coordination polymers reported so far.

关键词： coordination polymer thermal expansion framework flexibility topology

CoS_2 Yolk-Shell Spheres Coated with Carbon Thin Layers as High Active and Stable Electrocatalysts for Hydrogen Evolution Reaction

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 619-629页

作者： Wang Anliang Tong Yexiang Li Gaoren MOE laboratory of bioinorganic and Synthetic Chemistry The Key Lab of Low-Carbon Chemistry &Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen University

Though water electrolysis is effective in generating high-quality hydrogen gas,it requires effective electrocatalysts for hydrogen evolution reaction(HER).CoS_2 have been considered as a promising HER electrocatalyst because of its high ctalytic ***,the key limitation for CoS_2 nanomaterial as HER electrocatalyst is its poor stability,which may be due to the structural breakdown of CoS_2 nanostructure or the evolution of S during H_2 evolution in acid *** porous carbon thin layer for protection from structural breakdown and evolution of S is a good way to improve catalytic *** addition,coating carbon layer can change electronic structure of CoS_2 for the moderated hydrogen adsorption energy,leading to enhanced catalytic ***,CoS_2 yolk-shell spheres coated with carbon thin layers exhibit superior catalytic performance for HER with low overpotential,small Tafel slope,and excellent stability.

关键词： CoS2@C yolk-shell sphere electrocatalyst hydrogen evolution reaction(HER) high stability

Synthesis,crystal structures,electrochemical and spectroscopic properties of ruthenium(Ⅱ) complexes containing diamino-1,3,5-triazine derivatives

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Science China Chemistry 2010年第10期53卷 2099-2105页

作者： CHEN Yu, XU WenChao, KOU JunFeng, WEI XuHui, YU BoLe, CHAO Hui & JI LiangNian MOE laboratory of bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China 1. MOE laboratory of bioinorganic and Synthetic Chemistry School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou 510275 China

Three Ru(Ⅱ) complexes [Ru(bpy)2(1-IQTNH)](ClO4)2 (1), [Ru(bpy)2(2-QTNH)](ClO4)2 (2) and [Ru(bpy)2(3-IQTNH)](ClO4)2 (3) (bpy = 2,2′-bipyridine, 1-IQTNH = 6-(isoquinolin-1-yl)-1,3,5-triazine-2,4-diamine, 2-QTNH = 6-(quinolin-2-yl)-1,3,5-triazine-2,4-diamine, 3-IQTNH = 6-(isoquinolin-3-yl)-1,3,5-triazine-2,4-diamine) have been synthesized and characterized by elemental analysis, 1H NMR spectroscopy, electrospray ionization mass spectrometry and X-ray crystallography. The electrochemical and spectroscopic properties of the complexes differ from those of [Ru(bpy)3]2+ owing to the structural differences between the ligands and their complexes.

关键词： ruthenium(Ⅱ) complex diamino-1 3 5-triazine crystal structures electrochemistry spectroscopy

Carboxylic-containing copolymer as template to prepare CdS,ZnS and doped nanoparticles

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Science China Chemistry 2001年第1期44卷 23-30页

作者：孙聆东徐波付雪峰王明文钱程廖春生严纯华 1. State Key laboratory of Rare Earth Materials Chemistry & Applications PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry Peking University 100871 Beijing China

CdS, CdS:Mn, ZnS, ZnS:Mn and ZnS:Tb nanoparticles were preparedby using carboxylic-containing copolymer, polystyrene-maleic anhydride (PSM), as template. Average particle size, 2.5 nm for CdS nanoparticles, is deduced from UV-vis absorption spectra and consistent with the observation of TEM. Characteristic emissions of the doping ions can be observed and the energy transfer from the host to the doping ions is verified. Fourier transform infrared (FTIR) spectra were studied to confirm the bonding effect of the copolymer and the metal ions. PSM hydrolyzed and chelated metal ions by its carboxylic group, and then performed as a protection layer after the formation of nanoparticles.

关键词： polystyrene-maleic anhydride nanoparticle emission spectra

Advances and prospects of rare earth metal-organic frameworks in catalytic applications

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Journal of Rare Earths 2020年第8期38卷 801-818,I0001页

作者： Xiaochen Sun Kun Yuan Yawen Zhang Beijing National laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

In recent years,rare earth metal-organic frameworks(RE-MOFs)have attracted increasing attention because of abundant coordination behaviors,adjustable channels and stable *** various electron structures of rare earth ions contribute to the catalytic applications of RE-MOFs and their *** this review,we systematically summarize the research progress that using RE-MOFs and their derivates as catalysts for organic reaction,photocatalytic reaction,and CO oxidation *** major parts include synthetic strategies and catalytic applications of the ***,impressive achievements of RE-MOF catalysts are emerging and a prospect is provided for the development of RE-MOF catalysts at the end of the review.

关键词： Rare earth metal-organic frameworks Synthesis methodology Heterogeneous catalysis Photocatalysis

Antioxidant activity of polyaniline nanofibers

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Chinese Chemical Letters 2007年第8期18卷 1005-1008页

作者： Jia Wang Li Hua Zhu Jing Li He Qing Tang Department of Chemistry and Chemical Engineering Hubei Key laboratory of Bioinorganic Chemistry and Materia Medica Huazhong University of Science and Technology Wuhan 430074 China

Well-confined uniform polyaniline （PANI） nanofibers were synthesized by using photo-assisted chemical oxidative polymer- ization of aniline in the presence of different dopant acids, and the radical scavenging ability of the produced PANI nanofibers was determined by the DPPH assay. It was found that the antioxidant activity of PANI nanofibers was higher than conventional PANI, and increased with decreasing of averaged diameter of the nanofibers. The enhanced antioxidant activity was concerned with increased surface area of PANI nanofibers.

关键词： Polyaniline nanofibers Dopant acids Antioxidant activity DPPH radical