Studies of metallofullerene primary soots by laser and thermal desorption mass spectrometry

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100128a009· OSTI ID:5116468

Moro, L; Ruoff, R S; Becker, C H; Lorents, D C; Malhotra, R ^[1]

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1. SRI International, Menlo Park, CA (United States)

Laser desorption (LD) and thermal desorption (TD) mass spectra of the metallofullerenes found in arc-produced primary soots have been studied for a large variety of alkaline earth and lanthanide elements. The metallofullerene ratios found in the LD spectra indicate that two distinct groups are observed: Sc, Y, La, Ce, Pr, Nd, Gd, Tb, Ho, Er, and Lu (group A) and Ca, Sr, Sm, Eu, and Yb (group B). The TD spectra of most of these same soots also separate into two groups that contain the same elements as groups A and B. Group A metallofullerenes show strong signals in both LD and TD spectra. Group B metallofullerenes are distinguished by their presence in the LD spectra but absence in the TD spectra. From the general ionic behavior of the elements of these groups, and recent studies of the endohedral oxidation states, we propose that the oxidation states are +3 for group A and +2 for group B. C[sub 70] metallofullerenes are anomalous in that they are absent in TD spectra for all group A and B elements, even at T = 750[degrees]C, but present in LD spectra. 31 refs., 4 figs., 2 tabs.

• OSTI ID: 5116468
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:26; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CARBON
DESORPTION
ELEMENTS
FULLERENES
HEATING
LASER-RADIATION HEATING
MASS SPECTROSCOPY
NONMETALS
PLASMA HEATING
RARE EARTH COMPOUNDS
SOOT
SORPTION
SPECTROSCOPY
SYNTHESIS