Bonding in exohedral metal–fullerene cationic complexes

Robledo, Maitreyi; Aguirre, Néstor F.; Díaz‐Tendero, Sergio; Martín, Fernando; Alcamı́, Manuel

doi:10.1039/c4ra10776d

Cited by 18 publications

(31 citation statements)

References 63 publications

(61 reference statements)

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“… 32 For Cs, Rb, and K the Mulliken charge on the alkali is very close to +1.00 e but it decreases to about 0.90 e for Na and 0.70 e for Li. Qualitatively the same decreasing trend has been reported by other researchers for Li, Na, K. 23 , 24 , 31 , 33 …”

Section: Discussionsupporting

confidence: 89%

Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions

et al. 2017

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We report on the formation and ionization of cesium and C60Cs clusters in superfluid helium nanodroplets. Size distributions of positively and negatively charged (C60)mCsn± ions have been measured for m ≤ 7, n ≤ 12. Reproducible intensity anomalies are observed in high-resolution mass spectra. For both charge states, (C60)mCs3± and (C60)mCs5± are particularly abundant, with little dependence on the value of m. Distributions of bare cesium cluster ions also indicate enhanced stability of Cs3± and Cs5±, in agreement with theoretical predictions. These findings contrast with earlier reports on highly Cs-doped cationic fullerene aggregates which showed enhanced stability of C60Cs6 building blocks attributed to charge transfer. The dependence of the (C60)mCs3– anion yield on electron energy shows a resonance that, surprisingly, oscillates in strength as m increases from 1 to 6.

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Section: Discussionsupporting

confidence: 89%

Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions

et al. 2017

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“…For C 60 Li, however, the energy differences between hexagonal and pentagonal sites are very small; Hamamoto et al [11], Wang and Jena [12] and Sun et al [39] report a small energetic preference for the pentagonal site. The degree of charge transfer increases in the order Li/Na/K [11,37,40].…”

Section: Discussionmentioning

confidence: 99%

Adsorption of sodium and cesium on aggregates of C60

et al. 2016

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Abstract.We explore the formation of C60 sodium and C60 cesium complexes in superfluid helium nanodroplets. Anomalies in mass spectra of these doped droplets reveal anomalies in the stability of ions. (C60)mCs + n ions (m 6) are particularly abundant if they contain n = 6m + 1 cesium atoms; (C60)mCs 2+ n dications (m 3 or 5) are abundant if n = 6m + 2. These findings are consistent with the notion that alkali metal atoms (A) transfer their valence electrons into the three-fold degenerate lowest unoccupied orbital of C60, resulting in particularly stable C60A6 building blocks. However, (C60)4Cs 2+ n dications display an entirely different pattern; instead of an expected anomaly at n = 6 × 4 + 2 = 26 we observe a strong odd-even alternation starting at n = 6. Also surprising is the effect of adding one H2O or CO2 molecule to (C60)mCsn mono-or dications; anomalies shift by two units as if the impurity were acting as an acceptor for two valence electrons from the alkali metal atoms.

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“…It can be achieved by physical or chemical methods, and will allow the anchoring of isolated atoms because of the potential existing around these centres . The use of sp 2+δ materials presenting curved surface allows significantly higher binding energies, particularly with fullerenes, for which binding energy ranging between 1.25 and 3.1 eV have been reported for TM adatoms . Consequently, the production of metal fullerides, in which single metallic atoms are bonded to C 60 is possible, even if, in some cases, they constitute the kinetic product of the reaction .…”

Section: Types Of Carbon Materials For Single Atom Deposition and Nature Of The Adsorption Sitesmentioning

confidence: 99%

Single Atom Catalysts on Carbon‐Based Materials

2018

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Metal particle size is an important parameter to consider when looking at supported catalyst performances. As for other properties, surface reactivity of metallic nanoparticles is thus highly size‐dependent. The smallest size that can be reached for this type of object is of course the isolated atom deposited on a support. The preparation of single‐atom catalysts (SAC) is not trivial, since to avoid clustering, the mean adsorption energy of the metal on the support should be higher than its cohesive energy. The choice of a support that allows a strongly interacting environment with the metal is therefore a key step in the preparation of such catalysts. The spectrum of carbon (nano)materials is very broad, and their structure as well as their surface chemistry, although sometime complex, can be tuned and exploited for the stabilization of SAC. This Review summarizes in a comprehensive manner experimental and computational studies aiming at: i) preparing SAC on carbon materials, ii) understanding the metal‐support interactions in SAC, and iii) studying how this relates to catalytic performances. The use of SAC follows well the needs dictated by society (energy and environment issues), and many studies have already been published in various fields, such as thermal catalysis, photocatalysis and electrocatalysis.

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Bonding in exohedral metal–fullerene cationic complexes

Cited by 18 publications

References 63 publications

Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions

Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions

Adsorption of sodium and cesium on aggregates of C60

Single Atom Catalysts on Carbon‐Based Materials

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Bonding in exohedral metal–fullerene cationic complexes

Cited by 18 publications

References 63 publications

Positively and Negatively Charged Cesium and (C60)mCsn Cluster Ions

Positively and Negatively Charged Cesium and (C60)mCsn Cluster Ions

Adsorption of sodium and cesium on aggregates of C60

Single Atom Catalysts on Carbon‐Based Materials

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Product

Resources

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Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions

Positively and Negatively Charged Cesium and (C₆₀)_mCs_n Cluster Ions