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Nanoparticle supercrystals (NPSCs) are of great interest as materials with emergent properties. Different types of intermolecular forces, such as van der Waals interaction and hydrogen bonding, are present in the NPSCs fabricated to date. However, the limited structural stability of such NPSCs that results from the weakness of these intermolecular forces is a challenge. Here, we report a spontaneous formation of NPSCs driven by covalent bonding interactions, a type of intramolecular force much stronger than the above-mentioned intermolecular forces. A model solution-phase anhydride reaction is used to form covalent bonds between molecules grafted on the surface of gold nanoparticles, resulting in three-dimensional NPSCs. The NPSCs are very stable in different solvents, in dried conditions, and at temperatures as high as 160 °C. In addition to this, the large library of covalent-bond-forming reactions available and the low cost of reactants make the covalent bonding approach highly versatile and economical.
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http://dx.doi.org/10.1021/acs.nanolett.0c03616 | DOI Listing |
Angew Chem Int Ed Engl
December 2024
Northeast Forestry University, Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, CHINA.
Materials with red room-temperature phosphorescence (RTP) derived from sustainable sources are crucial but rarely reported. Here, we produced red RTP materials from lignin. Lignin was covalently modified with Upy (1-(6-isocyanatohexyl)-3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl) urea) to obtain Lig-Upy.
View Article and Find Full Text PDFJ Mater Chem B
December 2024
School of Physics, University of Sydney, Sydney, NSW 2006, Australia.
Polymeric nanoparticles surface functionalised with fluorescent molecules hold significant potential for advancing diagnostics and therapeutic delivery. Despite their promise, challenges persist in achieving robust attachment of fluorescent molecules for real-time tracking. Weak physical adsorption, pH-dependent electrostatic capture, and hydrophobic interactions often fail to achieve stable attachment of fluorescent markers.
View Article and Find Full Text PDFMol Omics
December 2024
Department of Chemistry and Biochemistry, University of Texas at Arlington, Box 19065, 700 Planetarium Place, Room 130, Arlington, TX 76019, USA.
Designing reagents for protein labeling is crucial for investigating cellular events and developing new therapeutics. Historically, much effort has been focused on labeling lysine and arginine residues due to their abundance on the protein periphery. The chemo-selectivity of these reagents is a challenging yet crucial parameter for deciphering properties specifically associated with the targeted amino acid.
View Article and Find Full Text PDFSmall
December 2024
School of Chemistry, Dalian University of Technology, Dalian, 116024, China.
Confinement of metal species in porous supports is an effective strategy to optimize hydrogenation performance ascribing to tunable nanopore environments. However, only focusing on the electronic structure modulation for metal species has limited the design of improved catalysts. Herein, spatial confinement strategy is reported for constructing ultrasmall metal clusters in nitro-bonded COF (M@TpPa-NO, M = Pd, Pt, Ru, Rh, Ir).
View Article and Find Full Text PDFChemistry
December 2024
Southwest University, school of chemistry and chemical enjineering, 2 Tiansheng Road, Beibei District, Chongqing, 400700, Chongqing, CHINA.
Currently, metal-organic frameworks (MOFs) with tunability and covalent organic frameworks (COFs) with high stability are promising nanomaterials for electrochemiluminescence (ECL), while Ru-based metal covalent organic frameworks (Ru-MCOFs) have rarely been reported. Herein, an ECL immunosensor based on a strong ECL-emitting Ru-MCOF was proposed for the sensitive detection of the cardiac troponin-I (cTnI). Imine-linked Ru-MCOF was prepared as an ECL emitter via solvothermal method using tris(4,4' -diamino-2,2' -bipyridine)ruthenium(II) (Ru(dbpy)32+) as a precursor.
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