Permanent magnetism in phosphine- and chlorine-capped gold: from clusters to nanoparticles

Muñoz‐Márquez, Miguel Ángel; Guerrero, E.; Fernández, A.; Crespo, P.; Hernando, A.; Lucena, Raquel; Conesa, J.C.

doi:10.1007/s11051-010-9862-0

Cited by 20 publications

(24 citation statements)

References 58 publications

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“…The Hakkinen's valence electron count for this cluster is 49 electrons, which is an odd number. The result is in agreement with permanent magnetism observed for triphenylphosphine capped n Au‐TPP particles reported previously and with our DFT calculations that indicates the ground state to be a magnetic doublet …”

supporting

confidence: 93%

“…25 clusters (black) shows a typical diamagnetic behavior for these clusters. A similar result was observed by Conesa and coworkers [ 27 ] for 1.4 nm triphenylphosphine-capped particles. The valence electron count for this cluster calculated using Hakkinen's method [ 28 ] gives 16 electrons, which is an even number (the PPh 3 ligands here are considered weak and Figure 1.…”

supporting

confidence: 89%

“…Figure a shows M vs H curves obtained for each of the four clusters at 5 K. The curve for mixed ligand‐stabilized Au 25 clusters (black) shows a typical diamagnetic behavior for these clusters. A similar result was observed by Conesa and coworkers for 1.4 nm triphenylphosphine‐capped particles. The valence electron count for this cluster calculated using Hakkinen's method gives 16 electrons, which is an even number (the PPh 3 ligands here are considered weak and do not contribute to the electron count).…”

supporting

confidence: 89%

“…The result is in agreement with permanent magnetism observed for triphenylphosphine capped n Au-TPP particles reported previously and with our DFT calculations that indicates the ground state to be a magnetic doublet. [ 10,25,27 ] The results clearly show two different magnetic behaviors for clusters with same core size ( i.e. 25 atoms).…”

mentioning

confidence: 91%

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Chemically Induced Magnetism in Atomically Precise Gold Clusters

Krishna

Tarakeshwar

Mújica

et al. 2013

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Comparative theoretical and experimental investigations are reported into chemically induced magnetism in atomically-precise, ligand-stabilized gold clusters Au25 , Au38 and Au55 . The results indicate that [Au25 (PPh3 )10 (SC12 H25 )5 Cl2 ](2+) and Au38 (SC12 H25 )24 are diamagnetic, Au25 (SC2 H4 Ph)18 is paramagnetic, and Au55 (PPh3 )12 Cl6 , is ferromagnetic at room temperature. Understanding the magnetic properties resulting from quantum size effects in such atomically precise gold clusters could lead to new fundamental discoveries and applications.

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confidence: 93%

supporting

confidence: 89%

supporting

confidence: 89%

mentioning

confidence: 91%

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Chemically Induced Magnetism in Atomically Precise Gold Clusters

Krishna

Tarakeshwar

Mújica

et al. 2013

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“…Gold nanoclusters (AuNCs) have attracted great attention in the past decade. Research interest ranges from fundamental properties such as photoluminescence,1–4 optical chirality,5–7 ferromagnetism,8 and quantized double‐layer charging behavior9, 10 to potential applications in optoelectronics,11 sensing,4, 12–15 and bioassays 16–18. Compared to semiconductor quantum dots, which have larger size (3–100 nm) and contain toxic metal species (e.g., cadmium, lead), AuNCs are highly attractive because of their smaller size and nontoxicity 19.…”

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confidence: 99%

Calcium Carbonate–Gold Nanocluster Hybrid Spheres: Synthesis and Versatile Application in Immunoassays

Peng

Feng

Zhang

et al. 2012

Chemistry A European J

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Fluorescent gold nanoclusters (AuNCs) were incorporated into porous calcium carbonate spheres through electrostatic interaction. The resulting CaCO(3)/AuNCs hybrid material exhibited interesting properties, such as porous structure, excellent biocompatibility, good water solubility, and degradability. These properties make the CaCO(3)/AuNCs hybrid material a promising template to assemble horseradish peroxidase/antibody conjugates (HRP-Ab(2)). By using CaCO(3)/AuNCs/HRP-Ab(2) bioconjugates as probes, a versatile immunosensor was developed for fluorescent and electrochemical detection of the cancer biomarker neuron-specific enolase (NSE). The detection limits of the sensor were 2.0 and 0.1 pg mL(-1) for fluorescent and electrochemical detection, respectively. The immunosensor shows high sensitivity and offers an alternative strategy for the detection of other proteins and DNA.

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