No abstract

Heat capacities of triphenylantimony dimethacrylate Ph3Sb(O2CCMeCH2)2 were measured by precision adiabatic vacuum calorimetry over the temperature range from T = (6 to 335) K and by differential scanning calorimetry over the temperature range from T = (300 to 470) K. The melting of the sample was observed within the above temperature range. The melting was accompanied by a compound decomposition. On the obtained data, the standard thermodynamic functions of molar heat capacity C p,m o, enthalpy H o(T) – H o(0), entropy S o(T), and Gibbs energy G o(T) – H o(0) of Ph3Sb(O2CCMeCH2)2 were calculated over the range from T = (0 to 400) K. The low-temperature (T < 50 K) heat capacity dependence was analyzed on the basis of Debye's heat capacity theory of solids and its multifractal model, so the characteristic temperatures and the fractal dimension were determined, and some conclusions about the structure topology were made. The standard entropy of formation at T = 298.15 K of Ph3Sb(O2CCMeCH2)2(cr) was calculated.

No abstract

No abstract

No abstract

No abstract

Low-temperature heat capacities of the crystalline bis(η 6 -mesitylene)vanadium fulleride [(η 6 -sim-Me]•À have been measured by a precision adiabatic vacuum calorimeter over the temperature range from T = (7 and 345) K for the first time. The experimental results have been used to calculate the standard (P°= 0.1 MPa) thermodynamic functions: molar heat capacities C p,m o , enthalpy H o (T) À H o (0), entropy S o (T), and Gibbs energy G o•À over the range from T = (0 to 345) K. The low-temperature (T < 50 K) dependence of the heat capacity was analyzed on the basis of Debye's heat capacity theory of solids and its fractal variant. Following that, the characteristic temperatures as well as the fractal dimension were determined, and some conclusions about the structure topology were made. The standard entropy of formation at•À (cr) was calculated. The standard thermodynamic properties of tested fulleride and previously studied C 60 fullerite were compared.

No abstract