Facile controlled preparation of gold nanoparticles with amphiphilic thiacalix[4]arene as reductant and stabilizer

Abstract

A facile controlled synthesis method of gold nanoparticles (AuNPs) under mild conditions has been developed by combining the stabilization ability of amphiphilic thiacalixarene and the reduction ability of phenolic moieties together, and the particle sizes of AuNPs can be readily controlled by only adjusting the feeding ratio of Au/S.

Controlled spontaneous generation of gold nanoparticles assisted by dual reducing and capping agents

“…8 to 40 - [72] 40 Sargassum wightii 8 to 12 11 [73] 41 Thermonospora sp. 7 to 12 8 [74] 42 Shewanella oneidensis 5 to 10 8.4±0.7 [75] 43 Bile salts 4 to 30 10 [76] 44 Bovine serum albumin -2 [ 77] 45 Cholesterol phenoxy hexanoate 12 to 16 - [79] 46 Cucurbit [7]uril 6 to 22 10±1.6 [80] 47 Thiacalix [4]arene -13.5 [81] 48 β-Cyclodextrin 60 to 100 - [82] 49 Hydroquinone 17 to 25 20 [83] 50 2,3,5,6-Tetrakis-(morpholinomethyl)hydroquinone -170±17 [84] 24 20 relationship existing between the surface of the particles and the stabilizing agent. In this regard, the growth of gold nanocrystals persists as long as the crystallization sites are not blocked by the capping agent and as long as the gold (III) salt is available in the reaction medium.…”

“…Interestingly, the nanoparticles thus obtained showed strong catalytic activities for the reduction of 4-nitrophenol in the presence of NaBH 4 . Similarly, reaction of HAuCl 4 with thiacalix [4] arene produced nanoparticles whose shapes were finely tuned by controlling the addition of HAuCl 4 [81]. This macrocyclic approach was also transposed to cyclic oligosaccharide β-cyclodextrin which formed spherical Au-NPs only in aqueous solutions free of dodecyltrimethylammonium bromide [82].…”

In situ template synthesis of gold nanoparticles using a bis-imidazolium amphiphile-based hydrogel

“…However, alternative ligands used to stabilize GNPs are also viable, such as amines [5], phosphines [6], triazole ring-containing polymers [7], and other polymers that may be synthetic [8] or extracts from natural sources [9,10]. Also, amphiphiles that both reduce and cap the GNPs have been employed [11,12] as well as imidazolium-based amphiphiles [13].…”

Thiacalix[4]arene functionalized gold nano-assembly for recognition of isoleucine in aqueous solution and its antioxidant study

“…Calix based nanoparticles have found versatile applications in all contemporary fields of science [20]. Tu et al have reported the preparation of size-controlled gold nanoparticles using amphiphilic thiacalixarene derivatized with a hydrophilic tail, namely, poly(ethylene glycol) monomethyl ether (SCaQ-MPEG550) [21]. A few calixarene functionalized AuNps have been reported as chemosensors for amino acids.…”