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Recent applications of click chemistry for the functionalization of gold nanoparticles and their conversion to glyco-gold nanoparticles
Abstract Glycoscience, despite its myriad of challenges, promises to unravel the causes of, potential new detection methods for, and novel therapeutic strategies against, many disease states. In the last two decades, glyco-gold nanoparticles have emerged as one of several potential new tools for glycoscientists. Glyco-gold nanoparticles consist of the unique structural combination of a gold nanoparticle core and an outer-shell comprising multivalent presentation of carbohydrates. The combination of the distinctive physicochemical properties of the gold core and the biological function/activity of the carbohydrates makes gl...
Source: Beilstein Journal of Organic Chemistry - January 3, 2018 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: azide – alkyne Huisgen cycloaddition carbohydrates click chemistry glyco-gold nanoparticles triazole Review Source Type: research

Glyco-gold nanoparticles: synthesis and applications
Abstract Glyco-gold nanoparticles combine in a single entity the peculiar properties of gold nanoparticles with the biological activity of carbohydrates. The result is an exciting nanosystem, able to mimic the natural multivalent presentation of saccharide moieties and to exploit the peculiar optical properties of the metallic core. In this review, we present recent advances on glyco-gold nanoparticle applications in different biological fields, highlighting the key parameters which inspire the glyco nanoparticle design. Beilstein J. Org. Chem. 2017, 13, 1008–1021. doi:10.3762/bjoc.13.100
Source: Beilstein Journal of Organic Chemistry - May 24, 2017 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: gold nanoparticles glyco nanoparticles glyconanomaterials immunology targeting Review Source Type: research

Optical detection of di- and triphosphate anions with mixed monolayer-protected gold nanoparticles containing zinc(II) – dipicolylamine complexes
Abstract Gold nanoparticles covered with a mixture of ligands of which one type contains solubilizing triethylene glycol residues and the other peripheral zinc(II)–dipicolylamine (DPA) complexes allowed the optical detection of hydrogenphosphate, diphosphate, and triphosphate anions in water/methanol 1:2 (v/v). These anions caused the bright red solutions of the nanoparticles to change their color because of nanoparticle aggregation followed by precipitation, whereas halides or oxoanions such as sulfate, nitrate, or carbonate produced no effect. The sensitivity of phosphate sensing depended on the nature of the anion...
Source: Beilstein Journal of Organic Chemistry - November 3, 2020 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: chemosensor diphosphate gold nanoparticles optical sensing triphosphate Full Research Paper Source Type: research

Cluster-mining: an approach for determining core structures of metallic nanoparticles from atomic pair distribution function data
A novel approach for finding and evaluating structural models of small metallic nanoparticles is presented. Rather than fitting a single model with many degrees of freedom, libraries of clusters from multiple structural motifs are built algorithmically and individually refined against experimental pair distribution functions. Each cluster fit is highly constrained. The approach, called cluster-mining, returns all candidate structure models that are consistent with the data as measured by a goodness of fit. It is highly automated, easy to use, and yields models that are more physically realistic and result in better agreeme...
Source: Acta Crystallographica Section A - December 17, 2019 Category: Chemistry Authors: Banerjee, S. Liu, C.-H. Jensen, K.M. Ø Juh á s, P. Lee, J.D. Tofanelli, M. Ackerson, C.J. Murray, C.B. Billinge, S.J.L. Tags: structural models nanoparticles clusters pair distribution functions data mining screening research papers Source Type: research

Towards atomistic understanding of polymorphism in the solvothermal synthesis of ZrO2 nanoparticles
Varying atomic short-range order is correlated with the ratio of the monoclinic (m) to tetragonal (t) phase in ZrO2 nanoparticle formation by solvothermal methods. Reactions from Zr oxynitrate in supercritical methanol and Zr acetate in water (hydrothermal route) were studied in situ by X-ray total scattering. Irrespective of the Zr source and solvent, the structure of the precursor in solution consists of edge-shared tetramer chains. Upon heating, the nearest-neighbor Zr — O and Zr — Zr distances shorten initially while the medium-range connectivity is broken. Depending on the reaction conditions, the disordered inter...
Source: Acta Crystallographica Section A - October 5, 2016 Category: Chemistry Authors: Dippel, A.-C. Jensen, K.M. Ø . Tyrsted, C. Bremholm, M. B ø jesen, E.D. Saha, D. Birgisson, S. Christensen, M. Billinge, S.J.L. Iversen, B.B. Tags: nanoparticles pair distribution function polymorphism solvothermal synthesis zirconia research papers Source Type: research

Crystallographic insights into the structural aspects of thioctic acid based halogen-bond donor for the functionalization of gold nanoparticles
The synthesis and self-assembly capabilities of a new halogen-bond donor ligand, 2,3,5,6-tetrafluoro-4-iodophenyl 5-(1,2-dithiolan-3-yl)pentanoate (1), are reported. The crystal structure of ligand (1) and the formation of a cocrystal with 1,2-di(4-pyridyl)ethylene, (1) · (2), both show halogen bonds involving the 4-iodotetrafluorobenzene moiety. Ligand (1), being a self-complementary unit, forms an infinite halogen-bonded chain driven by the S...I synthon, while the cocrystal (1) · (2) self-assembles into a discrete trimeric entity driven by the N...I synthon. Ligand (1) was also successfully used to functionalize the s...
Source: Acta Crystallographica Section B - March 29, 2017 Category: Chemistry Authors: Sanjeeva, K.B. Tirotta, I. Kumar, V. Bombelli, F.B. Terraneo, G. Metrangolo, P. Tags: self-assembly halogen bonding gold nanoparticles surface functionalization research papers Source Type: research

Sugar-based micro/mesoporous hypercross-linked polymers with in situ embedded silver nanoparticles for catalytic reduction
Abstract Porous hypercross-linked polymers based on perbenzylated monosugars (SugPOP-1–3) have been synthesized by Friedel–Crafts reaction using formaldehyde dimethyl acetal as an external cross-linker. Three perbenzylated monosugars with similar chemical structure were used as monomers in order to tune the porosity. These obtained polymers exhibit microporous and mesoporous features. The highest Brunauer–Emmett–Teller specific surface area for the resulting polymers was found to be 1220 m2 g−1, and the related carbon dioxide storage capacity was found to be 14.4 wt % at 1.0 bar and 273 K. As ...
Source: Beilstein Journal of Organic Chemistry - June 22, 2017 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: catalytic reduction hypercross-linking porous polymers silver nanoparticles sugar Full Research Paper Source Type: research

A numerical method for deriving shape functions of nanoparticles for pair distribution function refinements
In the structural refinement of nanoparticles, discrete atomistic modeling can be used for small nanocrystals (
Source: Acta Crystallographica Section A - June 6, 2018 Category: Chemistry Authors: Usher, T.-M. Olds, D. Liu, J. Page, K. Tags: nanoparticles shape function pair distribution function total scattering research papers Source Type: research

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles
Abstract A new heterogeneous catalytic system consisting of cobalt nanoparticles (CoNPs) supported on MgO and tert-butyl hydroperoxide (TBHP) as oxidant is presented. This CoNPs@MgO/t-BuOOH catalytic combination allowed the epoxidation of a variety of olefins with good to excellent yield and high selectivity. The catalyst preparation is simple and straightforward from commercially available starting materials and it could be recovered and reused maintaining its unaltered high activity. Beilstein J. Org. Chem. 2021, 17, 519–526. doi:10.3762/bjoc.17.46
Source: Beilstein Journal of Organic Chemistry - February 22, 2021 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: alkenes cobalt nanoparticles epoxides oxidation TBHP Full Research Paper Source Type: research

Molecules, Vol. 21, Pages 1227: Molecular-Based Fluorescent Nanoparticles Built from Dedicated Dipolar Thienothiophene Dyes as Ultra-Bright Green to NIR Nanoemitters
Fluorescent Organic Nanoparticles (FONs), prepared by self-aggregation of dedicated dyes in water, represent a promising green alternative to the toxic quantum dots (QDs) for bioimaging purposes. In the present paper, we describe the synthesis and photophysical properties of new dipolar push-pull derivatives built from thieno[3,2-b]thiophene as a π-conjugated bridge that connects a triphenylamine moiety bearing various bulky substituents as electron-releasing moiety to acceptor end-groups of increasing strength (i.e., aldehyde, dicyanovinyl and diethylthiobarbiturate). All dyes display fluorescence properties in chlorofor...
Source: Molecules - September 13, 2016 Category: Chemistry Authors: Cristiano Mastrodonato Paolo Pagano Jonathan Daniel Michel Vaultier Mireille Blanchard-Desce Tags: Article Source Type: research

Current progress and prospects of organic nanoparticles against bacterial biofilm
Adv Colloid Interface Sci. 2021 Jun 30;294:102475. doi: 10.1016/j.cis.2021.102475. Online ahead of print.ABSTRACTBiofilm plays a vital role in the pathogenicity and resistance of bacteria, and is an important problem to be settled urgently in the treatment of bacterial diseases. Exploring effective strategies to control bacterial biofilm has become a hot research topic. Compared to other measures, organic nanomaterials have shown greater prospects in overcoming the problems of bacterial biofilms due to their unique properties. In order to explore more effective organic nanomaterials against biofilms, we used relevant keywo...
Source: Advances in Colloid and Interface Science - July 19, 2021 Category: Chemistry Authors: Xinyao Li Dongmei Chen Shuyu Xie Source Type: research