NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2014, 5 (3), P. 435–440
POLYTHERMAL SOLUBILITY AND COMPLEX THERMAL ANALYSIS OF WATERSOLUBLE TRISMALONATE OF LIGHT FULLERENE —C60 [= C(COOH)2]3
K. N. Semenov – St. Petersburg State University, Saint Petersburg, Russia
N. A. Charykov – St. Petersburg State Technological Institute (Technical University); St. Petersburg State Electro-Technical University (LETI), Saint Petersburg, Russia
A. S. Kritchenkov – St. Petersburg State University, Saint Petersburg, Russia
I. A. Cherepkova – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
O. S. Manyakina – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
D. P. Tyurin – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
A. A. Shestopalova – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
V. A. Keskinov – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia; keskinov@mail.ru
K.V. Ivanova – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
N. M. Ivanova – St. Petersburg State University, Saint Petersburg, Russia
D. G. Letenko – St. Petersburg State University Architecture Academy, Saint Petersburg, Russia
V. A. Nikitin – St. Petersburg State Technical University, Saint Petersburg, Russia
E. L. Fokina – St. Petersburg State University, Saint Petersburg, Russia
I. A. Pestov – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
A. O. Netrusov – St. Petersburg State Technological Institute (Technical University), Saint Petersburg, Russia
The polythermal solubility of the trismalonate C60 [= C(COOH)2]3 – H2O binary system was investigated from 20 – 80 °C with the help of the method of isotherm saturation in ampoules. Concentration of tris-malonate C60 [= C(COOH)2]3 in solutions was determined by light absorption at 330 nm. A diagram of the solubility is non-monotonic, consisting of 2 branches, which correspond to 2 different crystal-hydrates of C60 [= C(COOH)2]3 and one non-variant point, corresponding to the saturation both crystal-hydrates. Complex thermal analysis of C60 [= C(COOH)2]3 crystal hydrates, in equilibrium with a saturated aqueous solution at room temperature, was performed from 20 – 600 °C. Consecutive effects of the losses of C=O and C=O + H2O were determined.
Keywords: tris-malonate of light fullerene, solubility, density, complex thermal analysis.
PACS 61.48.+c