Lanthanum carbide (La2C80): a soluble dimetallofullerene

Alvarez, Marcos M.; Gillan, Edward G.; Holczer, K.; Kaner, Richard B.; Min, Kweon Sik; Whetten, Robert L.

doi:10.1021/j100179a014

Cited by 218 publications

(112 citation statements)

References 0 publications

Supporting

Mentioning

111

Contrasting

Order By: Relevance

“…Similar results were obtained from studies of yttrium-fullerene complexes, with the additional observation of an anomalous abundance of Y 2 @Cs2 [5]. A dilanthanumfullerene, La 2 @Cs 0 , was observed first by Whetten and coworkers [6] to be very abundant in the LD/MS analysis of the toluene soot extract, yet, this dimetallofullerene had not been observed using similar methods [4,5].…”

Section: Introductionsupporting

confidence: 80%

Mass Spectrometry of Metallofullerenes

et al. 1992

View full text Add to dashboard Cite

Fullerenes with a metal atom inside of the cage, metallofulierenes, were produced by either laser vaporization or a graphite arc and characterized using a variety of mass spectrometric methods. First, yttrium-fullerene adducts were formed by direct laser vaporization of samples consisting of graphite, yttrium oxide and fullerenes. Fragmentation and oxidation ion/molecule reactions showed that the laser-generated adducts are endohedral complexes (Y,@Cj), in contrast to externally-bound Y(C,)+ species formed by gas-phase reactions. In addition, evidence was obtained for laserinduced bulk coalescence reactions yielding the metallofullerenes. Second, negative ion/desorption chemical ionization mass spectrometry was used to characterize metallofullerenes in arc-generated soot, pyridine extracts and the extract residue. The pyridine extracts of La 2 0 3 /graphite soot contain mostly La@Cs 2 and La 2 @Cs 0 , in addition to (empty) fullerenes. However, the raw soot and the extract residue contain a broader range of metallofullerenes with relative abundances different than those observed from the extract (e.g. abundant La@C6 0 , La@C 7 ) 0 and La@C 7 4 ). The thermal desorption behavior of the doped and undoped fullerenes indicate an interaction between the C. and LaQ@C, species. Analysis of aqueous solutions of dried pyridine extracts of LaO 3 /graphite soot show C. and La•@C,, which is consistent with the possible presence of metallofullerene/ fullerene ionic complexes, (La,@C)+C,-.

show abstract

Section: Introductionsupporting

confidence: 80%

Mass Spectrometry of Metallofullerenes

et al. 1992

View full text Add to dashboard Cite

show abstract

“…14 15 The yield of dimetallofullerenes in arc discharge burning is usually substantially lower than for monometallofullerenes and thus detailed spectroscopic information on these compounds is less abundant. The first dimetallofullerene isolated in considerable amounts was La 2 @C 80 , 16 and it is remains to be the most studied dimetallofullerene up to now. The family of dimetallofullerenes is less rich than that of the monometallofullerenes, the most abundant structures of M 2 @C 2n are based on C 80 (M = La, Ce) and C 82 (M = Y, Er, etc.)…”

Section: Introductionmentioning

confidence: 99%

Metal-Cage Bonding, Molecular Structures and Vibrational Spectra of Endohedral Fullerenes: Bridging Experiment and Theory

Popov¹

2009

Jnl of Comp & Theo Nano

View full text Add to dashboard Cite

A survey of theoretical and combined experimental/theoretical studies of endohedral metallofullerenes is given with the emphasis on endofullerenes with trimetallic nitride clusters. Three general topics are addressed. First, peculiarities of the metal-cage bonding are discussed. Then, the factors which determine isomerism of carbon cages in endohedral metallofullerenes are reviewed, including formal charge of the fullerene and the carbon cage dimensions in terms of its matching the size and shape of the encapsulated cluster. Finally, the strengths of vibrational spectroscopy as a powerful method in the studies of endohedral fullerenes and importance of theoretical modeling for interpretation of vibrational spectra are emphasized.

show abstract

“…16 Comparatively little is known about metal-carbon compounds containing more than one metal atom, since only several species M 2 C n have been isolated by, e.g., high-pressure liquid chromatography. 17,18 On the other hand, gas-phase molecular beam studies have proven the existence of a multitude of endohedrally doped fullerenes covering a far wider range of masses. Information on those metal-carbon compounds that are not available in macroscopic quantities is limited to theoretical approaches [19][20][21] and gas-phase experiments, namely anion laser photoelectron spectroscopy 22 and ion mobility measurements.…”

Section: Introductionmentioning

confidence: 99%

Mass spectra of metal-doped carbon and fullerene clusters

Klingeler

Bechthold

Neeb

et al. 2000

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present a systematic study of the abundancies of metal-doped cluster cations M x C n ϩ (MϭCa, Sc, Y, La, Ce, Gd; xϭ1,2͒ produced in a laser vaporization source. The mass spectra of MC n ϩ and M 2 C n ϩ reveal the onset of endohedrally doped fullerenes from which the smallest possible cage sizes can be deduced. Y 2 C n and La 2 C n show a distinct transition from alternation odd-even to even-odd at nϭ69 and nϭ71, respectively, which can be explained by a substantial change in the doped fullerene structure, i.e., from networked to bi-endohedral systems. A metal induced cluster formation pathway is briefly discussed.

show abstract

Lanthanum carbide (La2C80): a soluble dimetallofullerene

Cited by 218 publications

References 0 publications

Mass Spectrometry of Metallofullerenes

Mass Spectrometry of Metallofullerenes

Metal-Cage Bonding, Molecular Structures and Vibrational Spectra of Endohedral Fullerenes: Bridging Experiment and Theory

Mass spectra of metal-doped carbon and fullerene clusters

Contact Info

Product

Resources

About