Geodesic
Comparative raman study of photo-oligomer stability in the donor-acceptor fullerene complex $\{\operatorname{Pt}(\operatorname{dbdtc})_2\}\cdot \mathrm{C}_{60}$ and pristine $\mathrm{C}_{60}$
Nanosistemy: fizika, himiâ, matematika, Tome 7 (2016) no. 1, pp. 125-132

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The photopolymerization process and the stability of the $\mathrm{C}_{60}$ photo-oligomers at elevated temperature in the molecular donor-acceptor fullerene complex $\{\operatorname{Pt}(\operatorname{dbdtc})_2\}\cdot \mathrm{C}_{60}$ ($\mathrm{C}_{60}$ complex with platinum dibenzyldithiocarbamate) and pristine fullerite $\mathrm{C}_{60}$ are studied by Raman spectroscopy. Fast polymerization, manifested by the appearance of additional peaks in the frequency region of the $A_g(2)$ pentagon-pinch (PP) mode of the $\mathrm{C}_{60}$ molecule, was observed upon sample illumination at $514.5$ and $532$ nm, even at low laser power density as well as at $785$ nm at higher power density. The frequencies of the new peaks are in accordance with the empirical dependence of the PP-mode frequency on the number of the $sp^3$-like coordinated carbon atoms per molecular cage. The temperature dependence of the polymer content under constant laser power density reveals the decomposition of the photo-oligomers to monomers at $\sim350$ K in the fullerene complex $\{\operatorname{Pt}(\operatorname{dbdtc})_2\}\cdot \mathrm{C}_{60}$ and at $\sim410$ K in the case of the pristine $\mathrm{C}_{60}$. These values are considerably smaller than the decomposition temperature of $525$ – $565$ K for the crystalline polymers of $\mathrm{C}_{60}$.
Keywords: fullerene, molecular complexes, Raman spectroscopy, photopolymerization. 
@article{NANO_2016_7_1_a16,
     author = {K. P. Meletov and J. Arvanitidis and D. Christofilos and G. Kourouklis},
     title = {Comparative raman study of photo-oligomer stability in the donor-acceptor fullerene complex $\{\operatorname{Pt}(\operatorname{dbdtc})_2\}\cdot \mathrm{C}_{60}$ and pristine $\mathrm{C}_{60}$},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {125--132},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2016_7_1_a16/}
}
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K. P. Meletov; J. Arvanitidis; D. Christofilos; G. Kourouklis. Comparative raman study of photo-oligomer stability in the donor-acceptor fullerene complex $\{\operatorname{Pt}(\operatorname{dbdtc})_2\}\cdot \mathrm{C}_{60}$ and pristine $\mathrm{C}_{60}$. Nanosistemy: fizika, himiâ, matematika, Tome 7 (2016) no. 1, pp. 125-132. http://geodesic.mathdoc.fr/item/NANO_2016_7_1_a16/