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phosphine-free synthesis of FeTe2 nanoparticles and self-assembly into tree-like nanoarchitectures

Chinese Physics B 2019年第10期28卷 473-477页

作者：王红宇武敏王艺璇王浩黄晓丽杨新一 State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China College of Material Science and Engineering Jilin Jianzhu UniversityChangchun 130118China

Manipulating the self-assembly of transition metal telluride nanocrystals(NCs) creates opportunities for exploring new properties and device applications. Iron ditelluride(FeTe2) has recently emerged as a new class of magnetic semiconductor with three-dimensional(3D) magnetic ordering and narrow band gap structure, yet the self-assembly of FeTe2 NCs has not been achieved. Herein, the tree-like FeTe2 nanoarchitectures with orthorhombic crystal structure have been successfully synthesized by hot-injection solvent thermal approach using phosphine-free Te precursor. The morphology, size, and crystal structure have been investigated using transmission electron microscopy(TEM), high-resolution TEM(HRTEM),and powder x-ray diffraction(XRD). We study the formation process of tree-like FeTe2 NCs according to trace the change of the sample morphology with the reaction time. It was found that the FeTe2 nanoparticles show oriented aggregation and self-assembly behavior with the increase of reaction time, which is attributed to size-dependent magnetism properties of the samples. The magnetic interaction is thought to be the driving force of nanoparticle self-organization.

关键词： self-assembly transition metal tellurides phosphine-free Te precursor tree-like nanoarchitectures

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Functionalized Ionic Liquid as an Efficient and Recyclable Reaction Medium for phosphine-free Palladium Catalyzed Heck Reaction

Functionalized Ionic Liquid as an Efficient and Recyclable R...

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中国化学会第二十五届学术年会

作者：王磊周丽淮北煤炭师范学院化学系淮北煤炭师范学院化学系

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Advances in green colloidal synthesis of metal selenide and telluride quantum dots

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Chinese Chemical Letters 2019年第2期30卷 277-284页

作者： Dong Yao Yi Liu Jing Li Hao Zhang State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University The Scientific Research Center China-Japan Union Hospital Jilin University

During the past three decades, metal selenide and telluride quantum dots (QDs) have been deemed one of the most vital nanomaterials in virtue of their extensive applications, including lighting, solar harvesting,photocatalysis, biolabelling, quantum computing and so forth. With the growing demands for the QDrelated products, environmental friendly, energy-efficient and timesaving approaches to synthesize functional metal selenide and telluride QDs are greatly welcome. On the basis of the development in synthesis of chalcogen precursors, this mini review summarizes the recent progress in the green methods for synthesizing metal selenide and telluride QDs. At first, the panorama of basic synthetic methodology of metal chalcogenide QDs is briefly introduced. Then, numerous evolving colloidal synthetic methods are discussed, highlighting the phosphine-free precursors and the aqueous ionic precursors. Finally, this review ends with remaining challenges and future prospects in synthetic schemes. We hope this review will provide some stimulating information to promote further advancement in this area.

关键词： Green synthesis Metal selenide/telluride Quantum dots phosphine-free precursor Aqueous ionic precursor

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Aqueous-Phase, Palladium-Catalyzed Suzuki Reactions under Mild Conditions

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Green and Sustainable Chemistry 2013年第4期3卷 1-5页

作者： Yueqin Cai Gonghua Song Zhongyuan Wu Jiawei Zhang School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China Shanghai Key Laboratory of Chemical Biology Institute of Pesticides & Pharmaceuticals East China University of Science and Technology Shanghai China

Water-soluble ionic liquid-supported diols have been used as phosphine-free ligands in Suzuki couplings of aryl idides/bromides/chlorides under mild conditions in aqueous solvent. It was found that 2,2-bis((1-hexylimidazolium)-mehyl) propane-1,3-diol hexafluorophosphate (4) in combination with palladium (II) salts gave the most significant catalyst. Suzuki couplings of aryl iodides/bromides occurred efficiently at room temperature in water/acetonitrile. Notably, the reactions of hydrophilic aryl bromides gave high yields in neat water. The catalyst PdCl2-4 was recycled five times in Suzuki couplings in water before catalyst activity began to significantly drop. The average yield of five cycles was >95% per cycle.

关键词： Suzuki Reaction Ionic Liquid-Supported Diols phosphine-free Ligands

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