Journal ArticleDOI
Luminescent iron clusters in solution
Nirmal Goswami,Ananya Baksi,Anupam Giri,Paulrajpillai Lourdu Xavier,Gautam Basu,Thalappil Pradeep,Samir Kumar Pal +6 more
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TLDR
The synthesis and characterization of novel iron clusters in the hemoglobin matrix that are highly luminescent (quantum yield 10% at 565 nm) are reported.Abstract:
Metal clusters, composed of a few atoms at the core, exhibit unique properties and have potential applications. Although atomically precise clusters of noble metals have been synthesized, analogous systems of reactive metals, such as iron, have not been realized in solution due to high reactivity. Here we report the synthesis and characterization of novel iron clusters in the hemoglobin matrix that are highly luminescent (quantum yield 10% at 565 nm). The super-paramagnetic iron clusters, after successful ligand exchange from protein and phase transfer from water to chloroform using tri-octylphosphineoxide (TOPO), were detected as [Fe₁₀(TOPO)₃(H₂O)₃](+), [Fe₁₃(TOPO)₂(H₂O)](+) and [Fe₈(TOPO)(H₂O)₂](+) by mass spectrometry. This study lays the groundwork for exploiting unique properties of soluble iron clusters.read more
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Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles
TL;DR: Luminescence in the visible region, especially by clusters protected with proteins, with a large Stokes shift, has been used for various sensing applications, down to a few tens of molecules/ions, in air and water.
Journal ArticleDOI
Luminescent Metal Nanoclusters with Aggregation-Induced Emission.
TL;DR: The physical chemistry of a recently discovered aggregation-induced emission (AIE) phenomenon is discussed and the significance of AIE in understanding the PL properties of thiolated metal NCs is shown, as well as some recent developments in synthesizing the AIE-type luminescent metalNCs.
Journal ArticleDOI
Highly Luminescent Thiolated Gold Nanoclusters Impregnated in Nanogel
TL;DR: The “spatial confinement” method can be further used to prepare nanogels impregnated with Au nanoclusters of different color and different thiolate ligands, leading to a significant enhancement of their luminescence when in this nanogel.
Journal ArticleDOI
Bio-NCs – the marriage of ultrasmall metal nanoclusters with biomolecules
TL;DR: This feature article focuses on the recent studies emerging at the interface of metalNCs and biomolecules, where the interactions could impart unique physicochemical properties to the metal NCs, as well as mutually regulate biological functions of the bio-NCs.
Journal ArticleDOI
Mechanistic exploration and controlled synthesis of precise thiolate-gold nanoclusters
TL;DR: In this article, a review of recent advances in the precise control of well-defined thiolate-gold nanoclusters (generally described as Aun(SR)m NCs) is presented.
References
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Journal ArticleDOI
Structure of a thiol monolayer-protected gold nanoparticle at 1.1 A resolution
Pablo D. Jadzinsky,Guillermo Calero,Christopher J. Ackerson,David A. Bushnell,Roger D. Kornberg +4 more
TL;DR: The crystallization and x-ray structure determination of a p-mercaptobenzoic acid–protected gold nanoparticle, which comprises 102 gold atoms and 44 p-MBAs, is reported, which is chiral, with the two enantiomers alternating in the crystal lattice.
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Protein-directed synthesis of highly fluorescent gold nanoclusters.
TL;DR: A simple, one-pot, "green" synthetic route, based on the "biomineralization" capability of a common commercially available protein, bovine serum albumin (BSA), has been developed for the preparation of highly stable Au nanocrystals (NCs) with red emission and high quantum yield.
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Correlating the crystal structure of a thiol-protected Au25 cluster and optical properties.
TL;DR: An unusual single crystal structure of a 25-gold-atom cluster protected by eighteen phenylethanethiol ligands is reported, which violates the empirical golden rule "cluster of clusters", and is in good correspondence with time-dependent density functional theory calculations for the observed structure.
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Size-Dependent Cytotoxicity of Gold Nanoparticles
Yu Pan,Sabine Neuss,Annika Leifert,Monika Fischler,Fei Wen,Ulrich Simon,Günter Schmid,Wolfgang Brandau,Willi Jahnen-Dechent +8 more
TL;DR: A systematic study of water-soluble gold nanoparticles stabilized by triphenylphosphine derivatives ranging in size from 0.8 to 15 nm is made and the cytotoxicity of these particles in four cell lines representing major functional cell types with barrier and phagocyte function are tested.
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Glutathione-Protected Gold Clusters Revisited: Bridging the Gap between Gold(I)−Thiolate Complexes and Thiolate-Protected Gold Nanocrystals
TL;DR: It is proposed that a series of the isolated Au:SG clusters corresponds to kinetically trapped intermediates of the growing Au cores, and it is revealed that the subnanometer-sized Au clusters thiolated constitute a distinct class of binary system which lies between the Au(I)-thiolate complexes and thiolate-protected Au NCs.