Stepwise isolation of an unprecedented silylene supported dinuclear gold(i) cation with aurophilic interaction

2016 ◽  
Vol 52 (20) ◽  
pp. 3880-3882 ◽  
Author(s):  
Shabana Khan ◽  
Shiv Pal ◽  
Neha Kathewad ◽  
Indu Purushothaman ◽  
Susmita De ◽  
...  
Keyword(s):  
Aurophilic Interaction

Isolation of the first Si(ii) supported dinuclear Au(i) cation with an intramolecular Au⋯Au interaction of 2.875(1) Å has been realized.

scholarly journals Methionine-stabilized nonclassical growth within self-assembled de novo gold nanoparticles in conjunction with secondary nucleation inhibition

2021 ◽  
Author(s):  
Jitendra Sahu ◽  
Shahbaz Lone ◽  
Kalyan Sadhu
Keyword(s):  
Self Assembly ◽  
De Novo ◽  
Noble Metal Nanoparticles ◽  
Secondary Nucleation ◽  
Unique Case ◽  
Primary Particles ◽  
Growth Reaction ◽  
Aurophilic Interaction ◽  
Key Steps

Abstract The key steps for seed mediated growth of noble metal nanoparticles involve primary and secondary nucleation, which depends upon the energy barrier and ligand supersaturation standards of the medium. Herein we report the unique case of methionine (Met) controlled growth reaction, which rather proceeds via impeding secondary nucleation in presence of citrate stabilized gold nanoparticle (AuNP). The interaction between freshly generated Au+ and thioether group of Met in the medium restricts the secondary nucleation process involving further Au+ reduction. This incomplete conversion of Au+ results in a significant enhancement of the zeta (ζ) potential even at low concentration of Met. Furthermore, the aurophilic interaction of Au+ controls the self-assembly process of the in situ generated emissive nucleated particles. Nucleation of primary particles on seed surface, their segregation and time dependent conversion to larger particles within self-assembly confirm the nonclassical growth, which has further been explored with Met containing bio-inspired peptides.

scholarly journals Size Effect on Aurophilic Interaction in Gold-Chloride Cluster Anions of AunCln+1– (2 ≤ n ≤ 7)

ACS Omega ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 650-654 ◽  
Author(s):  
Yuan Ma ◽  
Shen Bian ◽  
Yingying Shi ◽  
Xingting Fan ◽  
Xianglei Kong
Keyword(s):  
Size Effect ◽  
Gold Chloride ◽  
Cluster Anions ◽  
Aurophilic Interaction

scholarly journals Methionine controlled impediment of secondary nucleation leading to nonclassical growth within self-assembled de novo gold nanoparticles

2021 ◽  
Author(s):  
Jitendra Sahu ◽  
Shahbaz Lone ◽  
Kalyan Sadhu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
De Novo ◽  
Metal Nanostructures ◽  
Secondary Nucleation ◽  
Growth Reaction ◽  
Aurophilic Interaction ◽  
Seed Mediated ◽  
Dependent Growth ◽  
Key Steps

Abstract The conventional key steps for seed mediated growth of noble metal nanostructures involve classical and nonclassical nucleation. Furthermore, the surface of the seed catalytically enhances the secondary nucleation involving Au+ to Au0reduction, thus providing in-plane growth of seed. In contrast to this well-established growth mechanism, herein we report the unique case of methionine (Met) controlled seed mediated growth reaction, which rather proceeds via impeding secondary nucleation in presence of citrate stabilized gold nanoparticle (AuNP). The interaction between the freshly generated Au+ and thioether group of Met in the medium restricts the secondary nucleation process of further seed catalyzed Au+ reduction to Au0. This incomplete conversion of Au+, as confirmed by X-ray photoelectron spectroscopy (XPS), results in a significant enhancement of the zeta (z) potential even at low Met concentration. Nucleation of in situgenerated small-sized particles (nAuNPs) takes place on the parent seed surface followed by their segregation from the seed. Self-assembly process of these nAuNPs arises from the aurophilic interaction among the Au+. Furthermore, the time dependent growth of smaller particles to larger sized particles through assembly and merging within the same self-assembly validates the non-classical growth. This strategy has been successfully extended towards the seed mediated growth reaction of AuNP in presence of three bio-inspired decameric peptides having varying number of Met residues. The study confirms the nucleation strategy even in presence of single Met residue in the peptide and also the self-assembly of nucleated particles with increasing Met residues within the peptide.

Mixed-metal complex [Fe(bipe)(Au(CN)2)2·MeOH] with gold clusters: a novel two-dimensional polyrotaxane net clipped by aurophilic interaction

CrystEngComm ◽  
2010 ◽  
Vol 12 (12) ◽  
pp. 4031 ◽  
Author(s):  
Haitao Xu ◽  
Gergely Juhász ◽  
Kazunari Yoshizawa ◽  
Masashi Takahashi ◽  
Shinji Kanegawa ◽  
...  
Keyword(s):  
Metal Complex ◽  
Gold Clusters ◽  
Two Dimensional ◽  
Mixed Metal ◽  
Aurophilic Interaction

Synthesis and Characterization of [3]Ferrocenophane-derived P, P-Chelate Ligand Gold Complexes Featuring an Aurophilic Interaction

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1413-1422 ◽  
Author(s):  
Gerrit Lübbe ◽  
Christian Nilewski ◽  
Gerald Kehr ◽  
Roland Fröhlich ◽  
Gerhard Erker
Keyword(s):  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Chelate Ligand ◽  
Gold Complexes ◽  
X Ray ◽  
Aurophilic Interaction

The P,P-chelate ligand (rac)-4 was prepared starting from the α-dimethylamino-[3]ferrocenophane by a series of directed ortho-lithiation, phosphination with ClPPh2 and substituent exchange using HPiPr2. Treatment with two molar equivalents of (Me2S)AuCl subsequently gave the corresponding κP,κP(AuCl)2 complex (rac)-9. In similar sequences the α-PCy2/o-PPh2 ligands (S,S,Spl )- 2 and the "substituent-invertomer" (R,R,Rpl)-3 (α-PPh2/o-PCy2) were prepared. Treatment with (Me2S)AuCl in a 1 : 2 ratio gave the chelate ligand-(AuCl)2 complexes (S,S,Spl )-8 and (R,R,Rpl)- 11, respectively. The ligand (rac)-4 and the gold complexes 8, 9 and 11 were characterized by X-ray diffraction. All three show an intramolecular Au . . . Au interaction

Control of aurophilic interaction: conformations and electronic structures of one-dimensional supramolecular architectures

2017 ◽  
Vol 46 (25) ◽  
pp. 8077-8082 ◽  
Author(s):  
Hiroaki Imoto ◽  
Shintaro Nishiyama ◽  
Takashi Yumura ◽  
Seiji Watase ◽  
Kimihiro Matsukawa ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Theoretical Studies ◽  
Ordered Structures ◽  
One Dimensional ◽  
Supramolecular Architectures ◽  
Aurophilic Interaction ◽  
Experimental And Theoretical Studies

Experimental and theoretical studies demonstrated that higher-ordered structures of one-dimensional aurophilic chains directly influenced their electronic structures.

Sulfur-bridged Linkage of [Ni(thiolato)2(amine)2]-type Complexes with Linear Gold(I) Ions Assisted by Aurophilic Interaction

2005 ◽  
Vol 34 (8) ◽  
pp. 1146-1147 ◽  
Author(s):  
Takumi Konno ◽  
Masafumi Usami ◽  
Atsushi Toyota ◽  
Masakazu Hirotsu ◽  
Tatsuya Kawamoto
Keyword(s):  
Aurophilic Interaction
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