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https://read.qxmd.com/read/30772669/one-pot-synthesis-of-polypyrrole-nanoparticles-with-tunable-photothermal-conversion-and-drug-loading-capacity
#1
Bingqian Guo, Jiulong Zhao, Chenyao Wu, Yuting Zheng, Changqing Ye, Mingxian Huang, Shige Wang
With an excellent near-infrared (NIR) light-responsive property, polypyrrole (PPy) nanoparticle has emerged as a promising NIR photothermal transducing agent for tumor photothermal therapy (PTT). Herein, we reported the PVP mediated one-pot synthesis of colloidal stable and biocompatible PPy nanoparticles (PPy-PVP NPs) for combined tumor photothermal-chemotherapy. The influence of molecular weight and PVP concentration on the spectroscopic characteristic, photothermal feature, drug loading performance, and antitumor efficiency of the resultant PPy-PVP NPs was systematically studied...
February 8, 2019: Colloids and Surfaces. B, Biointerfaces
https://read.qxmd.com/read/30772535/one-pot-solvothermal-synthesis-of-reduced-graphene-oxide-supported-uniform-ptco-nanocrystals-for-efficient-and-robust-electrocatalysis
#2
Han-Bin Meng, Xiao-Fang Zhang, Yu-Lu Pu, Xue-Lu Chen, Jiu-Ju Feng, De-Man Han, Ai-Jun Wang
Pt-based nanocomposites with low Pt utilization and high-activity by incorporating with other transition metals have received significant interest in catalysis. Meanwhile, loading Pt-based catalysts on graphene has great research value for improved stability and dispersity of the catalysts. Herein, a facile l-proline-mediated solvothermal strategy was reported to construct reduced graphene oxide (rGO) supported sheet-like PtCo nanocrystals (Pt78 Co22 NCs/rGO) in ethylene glycol (EG). The as-synthesized nanocomposite manifested remarkably improved catalytic properties and chemical stability for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), surpassing home-made Pt29 Co71 nanoparticles (NPs)/rGO, Pt83 Co17 NPs/rGO, Pt52 Co48 NPs, commercial Pt/C and Pt black catalysts...
January 28, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30772534/one-pot-aqueous-synthesis-of-two-dimensional-porous-bimetallic-ptpd-alloyed-nanosheets-as-highly-active-and-durable-electrocatalyst-for-boosting-oxygen-reduction-and-hydrogen-evolution
#3
Hong-Yan Chen, Mi-Xue Jin, Lu Zhang, Ai-Jun Wang, Junhua Yuan, Qian-Li Zhang, Jiu-Ju Feng
Recently, two-dimensional materials have gained increasing research attention due to their large surface area, high physical and chemical stability, and excellent electrocatalytic performances. Herein, we reported a simple and fast one-pot aqueous method for synthesis of two-dimensional porous bimetallic PtPd alloyed nanosheets (NSs) using benzyldimethylhexadecylammonium chloride (HDBAC) as the capping agent and stabilizer. The formation mechanism involved the oriented attachment and self-assembly. The PtPd NSs exhibited excellent oxygen reduction reaction (ORR) activity with the positive shift (c...
January 29, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30771909/facile-rapid-one-pot-synthesis-of-multifunctional-gold-nanoclusters-for-cell-imaging-hydrogen-sulfide-detection-and-ph-sensing
#4
Pengfei Gao, Min Li, Yan Zhang, Chuan Dong, Guomei Zhang, Lihong Shi, Gao Li, Mingjian Yuan, Shaomin Shuang
In this study, we have developed a facile, rapid one-pot strategy for synthesis of orange fluorescent gold nanoclusters (MBISA-AuNCs) at room temperature by using 2-Mercapto-5-benzimidazolesulfonic acid (MBISA) as both reducing and protecting reagent. The prepared AuNCs exhibited prominent advantages including high fluorescent quantum yield, good water solubility, excellent biocompatibility and low toxicity. Based on these superior properties, the AuNCs have been multi-talented applied in cell imaging, hydrogen sulfide detection and pH sensing...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771004/a-fluorescent-nanoprobe-for-4-ethylguaiacol-based-on-the-use-of-a-molecularly-imprinted-polymer-doped-with-a-covalent-organic-framework-grafted-onto-carbon-nanodots
#5
Huilin Liu, Ying Zhang, Dianwei Zhang, Fuping Zheng, Mingquan Huang, Jinyuan Sun, Xiaotao Sun, Hehe Li, Jing Wang, Baoguo Sun
An efficient and rapid fluorescent nanoprobe is described for the determination of the aroma compound 4-ethylguaiacol (4-EG). A molecularly imprinted polymer was doped with a covalent organic framework (COF) grafted onto carbon nanodots that was prepared by one-pot reverse microemulsion polymerization. Amino groups at the surface of carbon nanodots coordinate to the COFs to produce a strong bond and this warrants thermal and chemical stability of the probe. Remaining free amino groups interact with the phenolic hydroxyl groups of 4-EG through acid-base pairing interactions...
February 15, 2019: Mikrochimica Acta
https://read.qxmd.com/read/30768814/one-pot-synthesis-of-pd-ptnl-core-shell-icosahedral-nanocrystals-in-high-throughput-through-a-quantitative-analysis-of-the-reduction-kinetics
#6
Younan Xia, Chi-Ta Lee, Helan Wang, Ming Zhao, Tung-Han Yang, Madeline Vara
We report a one-pot method for the facile synthesis of Pd@PtnL (nL denotes the number of Pt atomic layers) core-shell icosahedral nanocrystals. The success of this method relies on the use of Na2PdCl4 and Pt(acac)2 as the precursors to Pd and Pt atoms, respectively. Our quantitative analysis of the reduction kinetics indicates that the Pd(II) and Pt(II) precursors are sequentially reduced with a major gap between the two events. Specifically, the Pd(II) precursor is reduced first, leading to the formation of Pd-based icosahedral seeds with a multiply-twinned structure...
February 15, 2019: Chemistry: a European Journal
https://read.qxmd.com/read/30763898/multifunctional-spiky-branched-gold-silver-nanostars-with-near-infrared-and-short-wavelength-infrared-localized-surface-plasmon-resonances
#7
Dickson Joseph, Rengarajan Baskaran, Su Geun Yang, Yun Suk Huh, Young-Kyu Han
We report a one-pot seedless green method for the synthesis of gold-silver (AuAg) spiky branched nanostars, with gold (90%) being the major component. Here, the zwitterionic surfactant lauryl sulfobetaine (LSB) is employed in the synthesis of bimetallic nanostars. The concentration of LSB plays an important role in determining the shape of nano-objects. A minimum LSB concentration of 50 mM is required for the formation of spiky branched nanostars, the size of which is controlled by increasing the LSB concentration...
February 7, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30763110/rh-iii-catalyzed-synthesis-of-3-amino-4-arylisoquinolinones-from-4-diazoisochroman-3-imines-and-n-methoxybenzamides
#8
Zhenmin Li, Li Wu, Ben Chang, Ping Lu, Yanguang Wang
A Rh(III)-catalyzed reaction of N-methoxybenzamides and 4-diazoisochroman-3-imines is described. This method offers a rapid entry to 3-amino-4-arylisoquinolinone architectures from readily available starting materials under mild reaction conditions. A one-pot cascade C-H bond activation/formal [4 + 2] cycloaddition mechanism is proposed. The synthesized 3-amino-4-arylisoquinolinones can be conveniently converted into dibenzo[ c, f][1,8]naphthyridines.
February 14, 2019: Organic Letters
https://read.qxmd.com/read/30762271/iridium-i-catalyzed-c-h-borylation-in-air-using-mechanochemistry
#9
Yadong Pang, Tatsuo Ishiyama, Koji Kubota, Hajime Ito
Mechanochemistry has been applied for the first time to an iridium(I)-catalyzed C-H borylation reaction. Using either none or just a catalytic amount of a liquid, the mechanochemical C-H borylation of a series of heteroaromatic compounds proceeded in air to afford the corresponding arylboronates in good to excellent yield. A one-pot mechanochemical C-H borylation/Suzuki-Miyaura cross-coupling sequence for the direct synthesis of 2-aryl indole derivatives is also described. The present study constitutes an important milestone toward the development of industrially attractive solvent-free C-H bond functionalization processes in air...
February 14, 2019: Chemistry: a European Journal
https://read.qxmd.com/read/30758352/hydrothermal-synthesis-of-novel-rhombic-dodecahedral-sns-nanocrystals-for-highly-efficient-photothermal-therapy
#10
Fei Chen, Dongliang Yang, Haifeng Shen, Meng Deng, Ying Zhang, Guolun Zhong, Yanling Hu, Lixing Weng, Zhimin Luo, Lianhui Wang
Novel rhombic dodecahedral SnS nanocrystals were prepared via a facile one-pot hydrothermal method for the first time, which exhibit a large extinction coefficient of 36.8 L g-1 cm-1 and a high photothermal conversion efficiency of 39.4% under irradiation with a 785 nm laser. Moreover, they show good performance for photothermal therapy of HeLa tumors.
February 13, 2019: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30747539/multicomponent-synthesis-of-isoindolinones-by-rh-iii-relay-catalysis-synthesis-of-pagoclone-and-pazinaclone-from-benzaldehyde
#11
Yan Zhang, Haiqian Zhu, Yuting Huang, Qi Hu, Yu He, Yihang Wen, Gangguo Zhu
A practical one-pot isoindolinone synthesis enabled by RhIII catalysis was developed. The advantage of this protocol is that it does not require pre-preparation of amide substrates, because RhIII participates in two reactions independently. This mild, operationally multicomponent process transforms a wide variety of commercially available aldehydes into the corresponding γ-lactams in good yields, thereby demonstrating that N-pyridin-2-yl benzamide is an effective directing group. Notably, the anxiolytic drugs pagoclone and pazinaclone can be directly prepared by this methodology...
February 12, 2019: Organic Letters
https://read.qxmd.com/read/30747535/distribution-of-cofe-2-o-4-nanoparticles-inside-pnipam-based-microgels-of-different-crosslinker-distributions
#12
Marcus U Witt, Stephan Hinrichs, Nadir Möller, Sebastian Backes, Birgit Fischer, Regine von Klitzing
The aim of this study is to tailor the inner structure of positively charged poly-(N-Isopropylacrylamid-co-allylamine) (P(NIPAM-co-AA)) microgels for a better control of the distribution of negatively charged magnetic cobaltferrite (CoFe_2 O_4 @CA) nanoparticles (MNP) within the microgels. Therefore, two different strategies are followed for the microgel synthesis: the (one pot) batch method which leads to a higher crosslinker density in the microgel core and the feeding method which compensates different reaction kinetics of the crosslinker and the monomers...
February 12, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30744747/co%C3%A2-adsorption-investigation-on-an-innovative-nanocomposite-material-with-hierarchical-porosity
#13
S Candamano, A Policicchio, A Macario, G Conte, R G Agostino, P Frontera, F Crea
A NaX nanozeolite-geopolymer monolith, with hierarchical porosity, has been produced by a one-pot hydrothermal synthesis using metakaolin as alluminosilicate source and a sodium silicate solution as activator. Its final composition, reported in terms of oxides, is 1.3-Na₂O-3.0SiO₂-1Al₂O₃-12H₂O. Its microstructural and chemical features and CO₂ adsorption performance have been investigated. The microstructure of the composite is characterized by NaX zeolite nanocrystals glued by the geopolymeric binder to form a complex three-dimensional network of pores...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30743991/one-pot-synthesis-of-triazolobenzodiazepines-through-decarboxylative-3-2-cycloaddition-of-nonstabilized-azomethine-ylides-and-cu-free-click-reactions
#14
Xiaoming Ma, Xiaofeng Zhang, Weiqi Qiu, Wensheng Zhang, Bruce Wan, Jason Evans, Wei Zhang
A one-pot synthesis of triazolobenzodiazepine-containing polycyclic compounds is introduced. The reaction process involves a decarboxylative three-component [3 + 2] cycloaddition of nonstabilized azomethine ylides, N -propargylation, and intramolecular click reactions.
February 8, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30741966/synthesis-of-18-f-favipiravir-and-biodistribution-in-c3h-hen-mice-as-assessed-by-positron-emission-tomography
#15
Thomas M Bocan, Falguni Basuli, Robert G Stafford, Jennifer L Brown, Xiang Zhang, Allen J Duplantier, Rolf E Swenson
Favipiravir (T705; 6-fluoro-3-hydroxypyrazine-2-carboxamide) is a pyrazine analog that has demonstrated potent antiviral activity against a broad spectrum of viruses in multiple in vivo disease models. To better understand the compounds anti-viral activity, assessment of the drug's biodistribution and kinetics in vivo may lend insight into how best to evaluate the compound efficacy preclinically and to contribute to the design of clinical studies to take into account the compound's pharmacokinetic distribution and kinetics...
February 11, 2019: Scientific Reports
https://read.qxmd.com/read/30741301/a-silver-i-catalyzed-cascade-bicyclization-strategy-for-synthesis-of-5h-benzo-d-tetrazolo-5-1-b-1-3-thiazines
#16
Jiankang Miao, Yahui Zhang, Xiaoyan Sang, Wenyan Hao
A simple and efficient protocol for silver(i)-catalyzed tandem reaction of o-alkynylphenyl isothiocyanates with sodium azide has been developed, affording a series of 5H-benzo[d]tetrazolo[5,1-b][1,3]thiazines in moderate to good yields. In this transformation, a [3 + 2] cycloaddition reaction mechanism was involved and two new rings were formed in one pot.
February 11, 2019: Organic & Biomolecular Chemistry
https://read.qxmd.com/read/30740262/enantioselective-synthesis-of-pharmaceutically-active-%C3%AE-aminobutyric-acids-using-a-tailor-made-artificial-michaelase-in-one-pot-cascade-reactions
#17
Lieuwe Biewenga, Thangavelu Saravanan, Andreas Kunzendorf, Jan-Ytzen van der Meer, Tjaard Pijning, Pieter G Tepper, Ronald van Merkerk, Simon J Charnock, Andy-Mark W H Thunnissen, Gerrit J Poelarends
Chiral γ-aminobutyric acid (GABA) analogues represent abundantly prescribed drugs, which are broadly applied as anticonvulsants, as antidepressants, and for the treatment of neuropathic pain. Here we report a one-pot two-step biocatalytic cascade route for synthesis of the pharmaceutically relevant enantiomers of γ-nitrobutyric acids, starting from simple precursors (acetaldehyde and nitroalkenes), using a tailor-made highly enantioselective artificial "Michaelase" (4-oxalocrotonate tautomerase mutant L8Y/M45Y/F50A), an aldehyde dehydrogenase with a broad non-natural substrate scope, and a cofactor recycling system...
February 1, 2019: ACS Catalysis
https://read.qxmd.com/read/30739439/one-pot-synthesis-of-high-quality-bimagnetic-core-shell-nanocrystals-with-diverse-exchange-coupling
#18
Yahong Chai, Feng Feng, Qilong Li, Chanchan Yu, Xueyan Feng, Pan Lu, Xiaolin Yu, Maofa Ge, Xiuyu Wang, Li Yao
Exchange coupled bimagnetic core/shell nanoparticles are promising for emerging multiferroic and spintronic technologies compared with traditional, single-phase materials, as they deliver numerous appealing effects, such as large exchange bias, tailored coercivities, and tunable blocking temperatures. However, it remains a challenge to manipulate their magnetic properties via exchange coupling due to the lack of a straightforward method that enables the general preparation of desired composites. Here we report a robust and general one-pot approach for the synthesis of different kinds of bimagnetic core/shell nanostructures (BMCS NSs)...
February 9, 2019: Journal of the American Chemical Society
https://read.qxmd.com/read/30736454/synthesis-of-aromatic-rings-embedded-in-polycyclic-scaffolds-by-triyne-cycloaddition-competition-between-carbonylative-and-non-carbonylative-pathways
#19
Laura Salacz, Nicolas Girard, Jean Suffert, Gaëlle Blond
Cycloadditions have emerged as some of the most useful reactions for the formation of polycyclic compounds. The carbonylative cycloaddition of triynes can lead to carbonylative and non-carbonylative competitive pathways, each leading to the formation of an aromatic ring. We report herein the one-pot synthesis of fully- and unsymmetrically-substituted tetracyclic 6,5,7,5-troponic and 6,5,6,5-benzenoid scaffolds using pre-organized triynes showing the competition between these two pathways.
February 7, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30735618/synergistic-dual-role-of-hmim-br-arso2cl-in-cascade-sulfenylation-halogenation-of-indole-mechanistic-insight-into-regioselective-c-s-and-c-s-c-x-x-cl-br-bonds-formation-in-one-pot
#20
Danish Equbal, Richa Singh, Saima Malik, Aditya Gandhidas Lavekar, Arun K Sinha
Bifunctionalized indoles are an important class of biologically active heterocyclic compounds and potential drug candidates. Because of the lack of efficient synthetic methods, one pot cascade synthesis of these compounds is rare and remains a challenge. To expand this field, we herein disclose a step-economic and temperature tunable strategy wherein the synergistic effect between [hmim]Br-ArSO2Cl leads exclusively to the formation of 3-arylthio indole via sulfenylation of indole at room temperature while heating the reaction mixture at 50 ºC provided an unexpected 2-halo-3-arylthio indole with construction of C-S and C-S/C-X (X= Br & Cl) bonds without addition of any external halogenating agent via cascade sulfenylation-halogenation reactions under metal-oxidant-base-free condition...
February 8, 2019: Journal of Organic Chemistry
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