The radiation-induced preparation of ultrasmall gold nanoparticles in Au(III) complexes with units of poly(1-vinyl-1,2,4-triazole) and poly(1-vinyl-1,2,4-triazole) – poly(acrylic acid)

Assembling of Metal-Polymer Nanocomposites in Irradiated Solutions of 1-Vinyl-1,2,4-triazole and Au(III) Ions: Features of Polymerization and Nanoparticles Formation

“…Significantly, when mixing aqueous solutions of VT and HAuCl 4 (the resulting pH is 2.5–3.0), a distinct band with the maximum at 310 nm ( Figure 1 A), corresponding to electronic transitions from occupied Cl − ligand orbitals to unoccupied metal orbitals [ 29 ], practically disappears. The same effect was observed earlier for PVT-HAuCl 4 aqueous solutions [ 27 ], and it clearly indicates the replacement of chlorine ions in the chloride complex by the triazole groups. The schematic representation of the proposed structures of the VT–Au(III) complexes is shown in Figure 1 B.…”

“…The schematic representation of the proposed structures of the VT-Au(III) complexes is shown in Figure 1B. Depending on pH and the VT/Au(III) ratio, L could be either a low molecular weight ligand Cl − , OH − or another VT molecule [27,29]. All experiments were carried out in a slightly acidic medium at an initial pH value of 5.6 (±0.2), which ensures the generation of reducing species with high yields [16,20] and prevents the hydrolysis of Au(III) ions [29].…”

“…Poly(1-vinyl-1,2,4-triazole) (PVT), synthesized in this work by the radiation-induced polymerization of (1-vinyl-1,2,4-triazole) (VT), is a biocompatible, non-toxic and hydrophilic polymer, which also shows high thermal and chemical stability [ 24 ]. VT-polymers exhibit an excellent ability to stabilize gold and silver nanoparticles, which determines the benefits of application of the systems based on them for the preparation of metal–polymer nanocomposites [ 25 , 26 , 27 ]. Thereby, taking into consideration the above-mentioned benefits of PVT as a matrix for AuNPs, PVT-based nanocomposites might be promising materials for medical applications, including therapy and theranostics.…”

“…Actually, small AuNPs ranging in size from one to several nanometers seem to be of particular interest owing to their extremely large total surface area. Recently, we reported that ultra-small AuNPs, with an average size of 1.5 nm, can be successfully obtained by the radiation chemical method in aqueous solutions in the presence of both PVT and poly(acrylic acid) [ 27 ].…”

Dithiocarbamates as Effective Reversible Addition–Fragmentation Chain Transfer Agents for Controlled Radical Polymerization of 1-Vinyl-1,2,4-triazole

“…PVT has shown high efficiency as a stabilizing matrix for silver and gold nanoparticles [ 12 , 13 ]. On the basis of interpolymer complexes of PVT and polyacrylic acid, under the action of X-rays, nanocomposites with a controlled size of gold and copper nanoparticles were obtained [ 14 , 15 ]. Using the radiation–chemical approach, nanocomposites with silver nanoparticles in a PVT matrix were obtained that exhibited a high antimicrobial activity against various strains of bacteria ( E. coli , P. aeruginosa , K. pneumoniae ), which depends on the size of the nanoparticles [ 16 ].…”