A tetrazole-based metallogel induced with Ag+ ion and its silver nanoparticle in catalysis

Abstract

A tetrazole-based ligand forms a supramolecular metallogel in the presence of Ag + in aqueous solution at basic condition. The silver-induced metallogel has been characterized by SEM, TEM, XRD and rheometry. The metallogel exhibits a fiber structure. Upon standing, silver nanoparticles grow in the gel. TEM confirmed that the particles are exclusively formed in the gel fibers. The size of the silver nanoparticles formed on the gel fibers is dependent to the concentration of silver during gel formation. The silver nanoparticles show a face-centered cubic crystalline structure. The silver nanoparticles can effectively catalyze reduction of 4-nitrophenol by sodium borohydride in aqueous solution. The formation of Ag + -induced metallogels does not strongly depend on anions. According to DFT calculations, two silver cations are coordinated to nitrogen at the tetrazole moiety. The other silver cation is coordinated to the nitrogen of the pyridine and coordinated to the oxygen of the amide moiety. Furthermore, the rheological properties of the Ag + -tetrazole-based metallogel were strongly dependent on the concentration of AgClO 4 .

A Gel-Based Approach To Design Hierarchical CuS Decorated Reduced Graphene Oxide Nanosheets for Enhanced Peroxidase-like Activity Leading to Colorimetric Detection of Dopamine

“…41,42 The importance of the in-situ preparation procedure relies on atom economy as no extra reducing agents or stabilizers are introduced to complete the reaction. 43,44 Our previous study has revealed that aqueous solution of Cu 2+ and thiourea (TU) proceeds through spontaneous one electron transfer protocol involving TU and Cu 2+ which results in Cu(I) species and oxidized form of TU.…”

Selective gelation of N-(4-pyridyl)nicotinamide by copper(ii) salts

“…The selectivity of metal salts in gelation process have been reported. The perchlorate and nitrate salts of Ag(I) selectively formed metallogels indicating the importance of metal salts in gelation 50 . The selectivity of copper(II) chloride salts over other copper(II) salts in metallogel formation have been reported 51 .…”

Metallogel Template Fabrication of pH‐Responsive Copolymer Nanowires Loaded with Silver Nanoparticles and Their Photocatalytic Degradation of Methylene Blue

“…In the templation synthesis of metal NPs, a supramolecular gel not only has coordination groups to entrap metal NPs or metal ions, but can also act as the medium that directs the in situ synthesis of 1D polymer nanostructures 12. The groups of Jung12a and Steed12b reported the preparation of silver nanoparticles (Ag NPs) in a metallogel with silver ions based on a tetrazole ligand and a pyridyl bis(urea) ligand. These are rare examples in which the metal ions act as both the template and the NP growth substrate.…”