scholarly journals Electrochemically Switchable Polymerization from Surface-Anchored Molecular Catalysts

2021 ◽  
Author(s):  
Miao Qi ◽  
Haochuan Zhang ◽  
Qi Dong ◽  
Jingyi Li ◽  
Rebecca A Musgrave ◽  
...  
Keyword(s):  
Solid State ◽  
Molecular Complexes ◽  
Polymerization Catalyst ◽  
Iron Based ◽  
Redox Switching ◽  
Molecular Catalysts

Redox-switchable polymerization of lactide and epoxides were extended to the solid state by anchoring an iron-based polymerization catalyst to TiO2 nanoparticles. The reactivity of the molecular complexes and their redox-switching...

scholarly journals Zn(II) Heteroleptic Halide Complexes with 2-Halopyridines: Features of Halogen Bonding in Solid State

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3393
Author(s):  
Mikhail A. Vershinin ◽  
Marianna I. Rakhmanova ◽  
Alexander S. Novikov ◽  
Maxim N. Sokolov ◽  
Sergey A. Adonin
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Crystal Packing ◽  
Halogen Bonding ◽  
Molecular Complexes ◽  
Substituted Pyridines ◽  
Halide Complexes

Reactions between Zn(II) dihalides and 2-halogen-substituted pyridines 2-XPy result in a series of heteroleptic molecular complexes [(2-XPy)2ZnY2] (Y = Cl, X = Cl (1), Br (2), I (3); Y = Br, X = Cl (4), Br (5), I (6), Y = I, X = Cl (7), Br (8), and I (9)). Moreover, 1–7 are isostructural (triclinic), while 8 and 9 are monoclinic. In all cases, halogen bonding plays an important role in formation of crystal packing. Moreover, 1–9 demonstrate luminescence in asolid state; for the best emitting complexes, quantum yield (QY) exceeds 21%.

scholarly journals Metallopolymerization as a Strategy to Translate Ligand-Modulated Chemoselectivity to Porous Catalysts

2019 ◽  
Author(s):  
Wen-Yang Gao ◽  
Andrew A. Ezazi ◽  
Chen-Hao Wang ◽  
Jisue Moon ◽  
Carter Abney ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Nir Spectroscopy ◽  
Molecular Complexes ◽  
Allylic Amination ◽  
X Ray ◽  
Porous Catalysts ◽  
Nitrene Transfer ◽  
Synthetic Strategy ◽  
Formidable Challenge ◽  
Molecular Catalysts

<div> <div> <div> <p>Porous catalysts have garnered substantial interest as potential platforms for group-transfer catalysis due to the ability to site-isolate catalysts and to non-covalently co- localize substrates in proximity to reactive intermediates. In contrast to soluble molecular catalysts, the limited synthetic toolbox available to prepare porous catalysts presents a formidable challenge to controlling the primary coordination sphere of lattice-confined catalysts and thus modulating the electronic structures of reactive catalyst intermediates. Here, we utilize Sonogashira cross-coupling chemistry to prepare a family of porous metallopolymers, in which the primary coordination sphere of Ru2 sites is systematically varied. The newly synthesized materials are characterized by IR, elemental analysis, gas sorption, powder X-ray diffraction, thermogravimetric analysis, X-ray absorption spectroscopy, and diffuse-reflectance UV-vis-NIR spectroscopy. The resulting porous materials are catalysts for nitrene-transfer chemistry and the chemoselectivty for allylic amination of olefin aziridination can be tuned by modulating the primary coordination sphere of the catalyst sites. The demonstration of metallopolymerization as a rational synthetic strategy allows to translate ligand-modulated chemoselectivity to porous catalysts, which represents a new opportunity to tailor the functionality of heterogeneous analogues of molecular complexes. </p> </div> </div> </div>

scholarly journals Metallopolymerization as a Strategy to Translate Ligand-Modulated Chemoselectivity to Porous Catalysts

2019 ◽  
Author(s):  
Wen-Yang Gao ◽  
Andrew A. Ezazi ◽  
Chen-Hao Wang ◽  
Jisue Moon ◽  
Carter Abney ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Nir Spectroscopy ◽  
Molecular Complexes ◽  
Allylic Amination ◽  
X Ray ◽  
Porous Catalysts ◽  
Nitrene Transfer ◽  
Synthetic Strategy ◽  
Formidable Challenge ◽  
Molecular Catalysts

<div> <div> <div> <p>Porous catalysts have garnered substantial interest as potential platforms for group-transfer catalysis due to the ability to site-isolate catalysts and to non-covalently co- localize substrates in proximity to reactive intermediates. In contrast to soluble molecular catalysts, the limited synthetic toolbox available to prepare porous catalysts presents a formidable challenge to controlling the primary coordination sphere of lattice-confined catalysts and thus modulating the electronic structures of reactive catalyst intermediates. Here, we utilize Sonogashira cross-coupling chemistry to prepare a family of porous metallopolymers, in which the primary coordination sphere of Ru2 sites is systematically varied. The newly synthesized materials are characterized by IR, elemental analysis, gas sorption, powder X-ray diffraction, thermogravimetric analysis, X-ray absorption spectroscopy, and diffuse-reflectance UV-vis-NIR spectroscopy. The resulting porous materials are catalysts for nitrene-transfer chemistry and the chemoselectivty for allylic amination of olefin aziridination can be tuned by modulating the primary coordination sphere of the catalyst sites. The demonstration of metallopolymerization as a rational synthetic strategy allows to translate ligand-modulated chemoselectivity to porous catalysts, which represents a new opportunity to tailor the functionality of heterogeneous analogues of molecular complexes. </p> </div> </div> </div>

scholarly journals Nanoparticles for the multivalent presentation of a TnThr mimetic and as tool for solid state NMR coating investigation

2019 ◽  
Vol 91 (9) ◽  
pp. 1471-1478 ◽  
Author(s):  
Francesco Papi ◽  
Giulia Targetti ◽  
Linda Cerofolini ◽  
Claudio Luchinat ◽  
Marco Fragai ◽  
...  
Keyword(s):  
Immune Response ◽  
Solid State ◽  
Silica Nanoparticles ◽  
Cancer Immunotherapy ◽  
Solid State Nmr ◽  
Proof Of Concept ◽  
Tnf Α ◽  
Iron Based ◽  
Solid System

Abstract The fully characterization of tumor associated antigens (TAAs) and of tumor associated carbohydrate antigens (TACAs) have opened the avenue of cancer immunotherapy. The intrinsic poor immunogenicity of TACAs, however, spotlighted the importance of multivalent presentation of the antigen(s) to trigger an immune response. Nanoparticles are excellent scaffolds for this purpose. Here we reported on the easy glycosylation of iron-based and biocompatible dextran-based nanoparticles with 1, a mimetic of the TnThr antigen. The multivalent presentation of 1 induced the induction of TNF-α and IL-6/IL10, respectively. The multivalent glycosylation of silica nanoparticles (GSiNPs) was also performed and saccharide loading qualitative assessed by solid state NMR. Our results offer the proof of concept that biomolecules coating can also be investigated on solid system by NMR.

From Molecular Complexes to Complex Metallic Nanostructures-2H Solid-State NMR Studies of Ruthenium-Containing Hydrogenation Catalysts

ChemPhysChem ◽  
2013 ◽  
Vol 14 (13) ◽  
pp. 3026-3033 ◽  
Author(s):  
Torsten Gutmann ◽  
Iker del Rosal ◽  
Bruno Chaudret ◽  
Romuald Poteau ◽  
Hans-Heinrich Limbach ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Molecular Complexes ◽  
Metallic Nanostructures ◽  
Nmr Studies ◽  
Hydrogenation Catalysts
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