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A. V. Markin V. A. Ruchenin N. N. Smirnova G. A. Abakumov G. V. Markin Yu. A. Shevelev V. A. Kuropatov M. A. Lopatin V. K. Cherkasov G. A. Domrachev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(8):1423-1429
The temperature dependence of heat capacity of crystalline bis(η6-ethylbenzene)chromium fulleride [(η6-EtPh)2Cr]·+ [C60]·− was studied in adiabatic vacuum calorimeter in the range of 6.7 to 344 K with an error of ±0.3%. Dependence of the parameters
of EPR signal of bis(η6-ethylbenzene)chromium fulleride on temperature was studied by electron paramagnetic resonance (EPR) in the range of 120 to
290 K. In the range of 204 to 246 K, upon heating, reversible endothermic transformation was recorded, which is caused by
the dissociation of dimer (C60−)2 and formation of fulleride [(η6-EtPh)2Cr]·+ [C60]·−; its standard thermodynamic parameters were estimated and analyzed. Standard thermodynamic functions were calculated by the
experimental data obtained: heat capacity, enthalpy, entropy, and Gibbs function of fulleride dimmer in the range of T → 0 to 204 K and monomer complex [(η6-EtPh)2Cr]·+ [C60]·− in the range of 246 to 344 K. Standard thermodynamic properties of fulleride under study, fullerides studied earlier, and
fullerite C60 were compared. 相似文献
2.
A. V. Markin V. A. Ruchenin N. N. Smirnova G. V. Markin Yu. A. Shevelev V. A. Kuropatov G. A. Domrachev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(8):1289-1294
The temperature dependence of the heat capacity of bis(η6-o-xylene)chromium(I) fulleride, [(η6-(o-xylene))2Cr]+?[C60]??, over the temperature range 6–340 K was measured on an adiabatic vacuum calorimeter. The low-temperature (20 K ≤ T ≤ 50 K) heat capacity was subjected to multifractal processing; conclusions about the heterodynamic character of the structure were drawn. The experimental data were used to calculate the standard thermodynamic functions C p ° (T), H °(T)-H °(0), S °(T), and G °(T)-H °(0) over the temperature range from T → 0 to 340 K and estimate the standard entropy of fulleride formation from simple substances at 298.15 K. The standard thermodynamic characteristics of [(η6-(o-xylene))2Cr]+?[C60]?? were compared with those of the initial fullerene C60. 相似文献
3.
A. V. Markin V. A. Ruchenin N. N. Smirnova E. A. Gorina S. N. Titova L. V. Kalakutskaya G. A. Domrachev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(12):2032-2038
The temperature dependence of heat capacity C
p
o = f(T) of fullerene derivative (t-Bu)12C60 has been measured by a adiabatic vacuum calorimeter over the temperature range T = 6–350 K and by a differential scanning calorimeter over the temperature range T = 330–420 K for the first time. The low-temperature (T ≤ 50 K) dependence of the heat capacity was analyzed based on Debye’s the heat capacity theory of solids and its fractal
variant. As a consequence, the conclusion about structure heterodynamicity is given. The experimental results have been used
to calculate the standard thermodynamic functions C
p
o (T), H
o(T)−H
o(0), S
o(T) and G
o(T) − H
o(0) over the range from T → 0 to 420 K. The standard entropy of formation at 298.15 K of fullerene derivative under study was calculated. The temperature
of decomposition onset of derivative was determined by differential scanning calorimetery and thermogravimetric analysis.
The standard thermodynamic characteristics of (t-Bu)12C60 and C60 fullerite were compared. 相似文献
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5.
V. A. Ruchenin A. V. Markin N. N. Smirnova G. V. Markin Yu. A. Shevelev V. A. Kuropatov M. A. Lopatin G. A. Domrachev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(6):928-933
The temperature dependence of the heat capacity of crystalline bis-(η6-ethoxybenzene)chromium fulleride [(η6-(EtOPh))2Cr]·+[C60]·− was studied for the first time by adiabatic vacuum calorimetry over the temperature range 6–340 K with errors of ±0.2%. The
temperature dependence of the EPR signal parameters of bis-(η6-ethoxybenzene)chromium fulleride was studied for the first time from 120 to 340 K. A reversible endothermic transformation
was observed between 160 and 250 K during heating; it was caused by the dissociation of the [(C60)2]2− dimer and the formation of the [(η6-(EtOPh))2Cr]·+[C60]·− fulleride; its standard thermodynamic characteristics were estimated and analyzed. The experimental data were used to calculate
the standard thermodynamic functions, including the heat capacity, enthalpy, entropy, and Gibbs function of the fulleride
dimer from T → 0 to 160 K and the [(η6-(EtOPh))2Cr]·+[C60]·− monomeric complex over the temperature range 250–340 K. The standard thermodynamic properties of the fulleride studied, fullerides
studied earlier, and fullerite C60 were compared. 相似文献
6.
N. N. Smirnova Yu. A. Zakharova V. A. Ruchenin O. G. Zamyshlyayeva 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2012,86(4):539-547
The temperature dependence of the heat capacity of cross-linked and branched (co)polymers based on tris- and bis-(pentafluorophenyl)germanes is studied in the temperature range of 6–7 to 535–570 K, using adiabatic vacuum and differential
scanning calorimeters. In the indicated temperature range, physical transformations are revealed and their thermodynamic characteristics
are determined. The obtained experimental data are used to calculate the thermodynamic functions of (co)polymers: C
p
/°, H°(T) - H°(0), S°(T) - S°(0), and G°(T) - H°(0) in the range of T → 0 to 535 K for the branched (co)polymer and from T → 0 to 500 K for the cross-linked polymer. Their standard entropies of formation are determined at 298.15 K. The obtained
results are compared with analogous data for hyperbranched perfluorinated polyphenylenegermane studied earlier. The effect
of the structure of polyphenylenegermanes on their thermodynamic properties is analyzed. 相似文献
7.
A. V. Markin N. N. Smirnova I. E. Boronina V. A. Ruchenin A. G. Lyapin 《Russian Chemical Bulletin》2008,57(9):1975-1980
Temperature dependences of the heat capacities of disordered graphite-like nanostructures prepared by the thermobaric treatment
of fullerite C60 (p = 2 and 8 GPa, T = 1373 K) were measured in the temperature ranges from 7 to 360 K in an adiabatic vacuum calorimeter and from 330 to 650
K in a differential scanning calorimeter. At T < 50 K, the dependences obtained were analyzed using the Debye theory of the heat capacity of solids and its multifractal
version. The fractal dimensions D were determined and some conclusions on the heterodynamic character of the structures studied were made. The thermodynamic
functions C
p
o
T), H
o(T) − H
o(0), S
o(T) − S
o(0), and G
o(T) − H
o(0) were calculated in the temperature range from T → 0 to 610 (650) K. The thermodynamic properties of the graphite-like nanostructures studied and some carbon allotropes were
compared. The standard entropies of formation Δf
S
o of the graphite nanostructures studied and diamond were calculated along with the standard entropies of the reactions of
their synthesis from the face-centered cubic phase of fullerite C60 and their interconversions at T = 298.15 K.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1940–1945, September, 2008. 相似文献
8.
Kurenkov V. F. Snigirev S. V. Churikov F. I. Ruchenin A. A. Lobanov F. I. 《Russian Journal of Applied Chemistry》2001,74(3):445-448
A study was made of the low-temperature hydrolysis of high-moleculer-weight polyacrylamide Praestol under the action of NaOH in dilute aqueous solution. The performance of the hydrolyzed and nonhydrolyzed polymer when combined with aluminum sulfate in treatment of natural water was estimated. 相似文献
9.
N. N. Smirnova A. V. Markin V. A. Ruchenin S. N. Titova E. A. Gorina L. V. Kalakutskaya G. A. Domrachev A. M. Ob”edkov S. Yu. Ketkov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(6):854-860
The temperature dependence of the heat capacity C p o of the [(Me3Si)7C60]2 fullerene complex was measured for the first time using precision adiabatic vacuum calorimetry over the temperature range 6.7–340 K and high-accuracy differential scanning calorimetry at 320–635 K. For the most part, the error in the C p o values was about ±0.5%. An irreversible endothermic effect caused by the splitting of the dimeric bond between fullerene fragments and the thermal decomposition of the complex was observed at 448–570 K. The thermodynamic characteristics of this transformation were calculated and analyzed. Multifractal analysis of the low-temperature (T < 50 K) heat capacity was performed, and conclusions were drawn concerning the character of the heterodynamicity of the structure. The experimental data obtained were used to calculate the standard thermodynamic functions C p o (T), H o (T) ? H o (0), S o (T) ? S o (0), and G o (T) ? H o (0) over the temperature range from T → 0 to 445 K and estimate the standard entropy of formation of the compound from simple substances at 298.15 K. The standard thermodynamic properties of [(Me3Si)7C60]2 are compared with those of the (C60)2 dimer, the [(η6-Ph2)2Cr]+[C60]?? fulleride, and the initial C60 fullerene. 相似文献
10.
I. A. Letyanina N. N. Smirnova A. V. Markin V. A. Ruchenin V. N. Larina V. V. Sharutin O. V. Molokova 《Journal of Thermal Analysis and Calorimetry》2011,103(1):355-363
In the present research for the first time, the heat capacity
C\textp ° C_{\text{p}}^{ \circ } of crystalline tetraphenylantimony acetophenoneoxymate Ph4SbONCPhMe has been measured using the methods of precision adiabatic vacuum calorimetry over the range from 6 to 350 K, the
standard thermodynamic functions: heat capacity
C\textp ° (T ) C_{\text{p}}^{ \circ } (T ) , enthalpy H°(T) − H°(0), entropy S°(T), and Gibbs function G°(T) − H°(0) have been calculated over the range from T → 0 K to 350 K. Low-temperature (20 K ≤ T ≤ 50 K) heat capacity data have shown a chain-layered structure topology of the compound under study. The energy of combustion
of the compound has been determined in the isothermal combustion calorimeter with a stationary bomb. The standard thermodynamic
functions of formation of crystalline Ph4SbONCPhMe at 298.15 K have been calculated. The differential scanning calorimetry and thermogravimetric analysis studies have
shown the compound melts with decomposition and its melting temperature has been estimated. Thermodynamic properties of Ph4SbONCPhMe, Ph5Sb and Ph4SbONCPh2 have been compared. 相似文献
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