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New M 3 N@C 2 n Endohedral Metallofullerene Families (M=Nd, Pr, Ce; n =40–53): Expanding the Preferential Templating of the C 88 Cage and Approaching the C 96 Cage
Author(s) -
Chaur Manuel N.,
Melin Frederic,
Elliott Bevan,
Kumbhar Amar,
Athans Andreas J.,
Echegoyen Luis
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200800044
Subject(s) - metallofullerene , cerium , cyclic voltammetry , chemistry , neodymium , praseodymium , mass spectrum , spectroscopy , endohedral fullerene , crystallography , electrochemistry , mass spectrometry , metal , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , fullerene , organic chemistry , chromatography , electrode , laser , physics , optics , quantum mechanics
Three new families of trimetallic nitride template endohedral metallofullerenes (TNT EMFs), based on cerium, praseodymium, and neodymium clusters, were synthesized by vaporizing packed graphite rods in a conventional Krätschmer–Huffman arc reactor. Each of these families of metallofullerenes was identified and characterized by mass spectroscopy, HPLC, UV/Vis‐NIR spectroscopy, and cyclic voltammetry. The mass spectra and HPLC chromatograms show that these larger metallic clusters are preferentially encapsulated by a C 88 cage. When the size of the cluster is increased, the C 96 cage is progressively favored over the predominant C 88 cage. It is also observed that the smaller cages (C 80 –C 86 ) almost disappear on going from neodymium to cerium endohedral metallofullerenes. The UV/Vis‐NIR spectra and cyclic voltammograms confirm the low HOMO–LUMO gap and reversible electrochemistry of these M 3 N@C 88 metallofullerenes.