Synthesis and NMR study of trimethylphosphine gold(i)-appended calix[8]arenes as precursors of gold nanoparticles

Abstract

In this paper, the synthesis of gold(i)-calix[8]arene complexes from benzyloxycalix[8]arene is reported as well as their radiolytic reduction leading to gold nanoparticles.

Gold(i)–silver(i)-calix[8]arene complexes, precursors of bimetallic alloyed Au–Ag nanoparticles

“…First, trimethylphosphine Au(I)-appended calix [8]arene containing eight and sixteen equivalents of gold (Au(I)-C8 and 2Au(I)-C8, Chart 1) were synthesised and characterised by 1 H and 31 P NMR spectroscopy. 6 We also showed that the radiolytic reduction of these complexes leads to the formation of small Au NPs homogeneous in size. This has prompted us to prepare bimetallic complexes with eight equivalents of gold and eight equivalents of silver, and to reduce them to produce alloyed bimetallic NPs.…”

“…The main aromatic resonances observed around 6.3 ppm for Au(I)-C8 disappear in favour of two broad signals around 5.9 and 6.5 with the addition of Ag(I)-(PPh 3 ) 2 revealing a lowering of the symmetry of the formed Au(I)Ag(I)-C8 complexes, as already noted in the case of the previously synthesised 2Au(I)-C8 complexes. 6 Moreover, in the case of Au(I)-Ag(I)-C8_R1, the spectrum shows more resolved peaks compared to Au(I)-Ag(I)-C8_R2 suggesting more rigid conformers. The presence of Et 3 N in excess in the case of the route R1 might account for such results possibly by hydrogen bonding between the acidic [H-N(Et 3 )] + and the free hydroxyl groups of the calixarene.…”

“…The synthesis of p-octa(hydroxy)-octa(mercaptobutoxy)-calix [8] arene C8 and p-octa(hydroxy)-octa(mercaptobutoxy)-octa(trimethylphosphine)gold(I)-calix [8]arene (Au(I)-C8) have already been described in details elsewhere. 5,6 Bis(triphenylphosphine)silver(I) chloride (Cl-Ag-(PPh 3 ) 2 ). The compound was obtained according to the previously reported procedure.…”

Domino Suzuki-Miyaura Cross-Coupling and Oxidative Condensation Reaction: An Approach Towards Synthesis of Phenanthridine and Its Analogues

“…1, 4), 24 antibacterial, anti-infectives, antprotozoal, antituberculosis, antitrypanosomiasis compounds 5,18,19,[25][26][27][28][29][30][31][32] . The phenanthridine ring systems are also used in lockable colorimetric fluorescence molecular switch, PET tracers, and in material science applications 4,15,22,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] .…”

Novel β-Cyclodextrin Functionalized Core-Shell Fe3O4 Magnetic Nanoparticles for the Removal of Toxic Metals from Water

“…47 The surface of MNPs has also been functionalized with macromolecules such as calixarenes, crown ethers and cyclodextrins due to the macrocyclic properties of these compounds which have a stabilizing effect of the entire entity along with the stabilization of the magnetic core. The unique host-guest type interactions and the variation in ring sizes and chemical groups thus make them attractive candidates for surface functionalization [48][49][50][51][52][53] .…”