Synthesis and Characterization of Poly‐NHC‐Derived Silver(I) Assemblies and Their Transformation into Poly‐Imidazolium Macrocycles

Abstract

Three metallosupramolecular assemblies composed of two bis-NHCs and two silver atoms, [4](PF 6 ) 2 , two tetra-NHCs and four silver atoms, [7](PF 6 ) 4 , and two tri-NHCs and three silver atoms [8](BF 4 ) 3 , have been prepared. Assemblies [4](PF 6 ) 2 and [7](PF 6 ) 4 feature NHC ligands decorated with terminal olefin groups. Irradiation of [4](PF 6 ) 2 yielded complex [5](PF 6 ) 2 with two terminal cyclobutane rings linking the two bis-NHC ligands. Liberation of the macrocyclic tetrakisimidazolium salt H 4 -6(PF 6 ) 4 was achieved by reaction of [5](PF 6 ) 2 with NH 4 Cl/NH 4 PF 6 . No [2 + 2] cycloaddition was observed upon irradiation of [7](PF 6 ) 4 , apparently due to an unfavorable orientation of the olefin groups. Irradiation of complex [8](BF 4 ) 3 with three internal pairs of olefin groups leads to [9](BF 4 ) 3 as a mixture of two isomers that differ on the relative orientation of the internal cyclobutane rings. Reaction of [9](BF 4 ) 3 with NH 4 Cl/NH 4 BF 4 yields an isomer mixture of the novel cage-line hexakisimidazolium salt H 6 -10(BF 4 ) 6 .

Colorimetric and naked-eye detection of arsenic(iii) using a paper-based microfluidic device decorated with silver nanoparticles

“…Silver atoms are strongly bonded to electron-rich sites due to their performance among the highest. 38,45 These cumulative negative charges carried through the nanoparticle domain are separate and increase the stability of the NPs. Cysteine acts as an adsorbent due to its thiol, amine, and carboxylate sites.…”

Synthesis of silver complexes with chelating bidentate N‐heterocyclic ligands, their application in catalytic A3 coupling, and as antimicrobial agents

“…[9] Examples where the bidentate ligand chelates the silver ion are scarce, and only a few such complexes are known. [10][11][12][13] Raising antibiotic resistance is one of the major medical threats nowadays. [14,15] Before the invention of modern antibiotics, silver was the major tool to fight the bacterial infection.…”

“…[ 9 ] Examples where the bidentate ligand chelates the silver ion are scarce, and only a few such complexes are known. [ 10–13 ]…”

Template-Controlled Supramolecular Photodimerization of 2-Substituted Anthracenes Mediated by Metal–NHC Complexes

“…Particularly, the [4 + 4] photodimerization of anthracene is one of the most extensively investigated photochemical reactions and has enormous potential in chemical synthesis. − However, such photochemical transformation always suffers from nonspecific regio- and stereoselectivity during the photoreactions in homogeneous solutions and thus results in product mixtures of diverse configurations . Therefore, developing a controllable strategy that can efficiently generate photochemical products with a definite configuration in solution is of interest. − …”