Cage Destruction in Metal-Fullerene Clusters.

摘要: Mass spectrometric studies on free clusters composed of single fullerene molecules and transition metal atoms ( ${\mathrm{C}}_{60}{M}_{x}$ ${\mathrm{C}}_{70}{M}_{x}$; $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0,\dots{},150$, $M\ensuremath{\in}{\mathrm{T}\mathrm{i},\phantom{\rule{0ex}{0ex}}\mathrm{V},\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{b},\phantom{\rule{0ex}{0ex}}\mathrm{T}\mathrm{a}}$) reveal that they undergo a laser induced transformation from metal-fullerene to carbide metallo-carbohedrene clusters. Two types fragmentation behavior are observed. Fullerenes doped with titanium or vanadium seem be stable at low intensities, whereas tantalum niobium severely destabilize the cage. Photofragmentation spectra preselected ${\mathrm{C}}_{60}{\mathrm{Ta}}_{x}$ indicate ${\mathrm{C}}_{60}$ cage is destroyed for $x\ensuremath{\ge}3$.