Heat Capacity and Standard Thermodynamic Functions of Bis(η⁶-mesitylene)vanadium Fulleride [(η⁶-sim-Me₃H₃C₆)₂V]^•+[C₆₀]^•–over the Range fromT= (0 to 345) K

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.

Harnessing the Synergistic and Complementary Properties of Fullerene and Transition-Metal Compounds for Nanomaterial Applications

“…[282] Examples of transition metal doped fullerides are less abundant, and are summarised in Table 7. Among the transition metals fulleride compounds most common are smaller first row transition metals derivatives, with various examples of Cr compounds [285][286][287][288][289][290][291][292][293][294][295] as well as Ti, [283] V, [284] Mn, [296] Ni, [296,297] Fe [296,297] and Cu. [297] A few examples of larger second row transition metals such as Mo, [295,298] Pd, [299] Ag [297] and Cd [296], Pt [299][300][301] and Au [302] of the third row have also been reported.…”

“…Among the transition metals, the most common fulleride compounds are smaller first-row transition-metal derivatives, with various examples of Cr compounds − as well as Ti, V, Mn, Ni, , Fe, , and Cu . A few examples of larger second-row transition metals such as Mo, , Pd, Ag, and Cd and third-row transition metals Pt − and Au have also been reported.…”

“…The majority of compounds containing C 60 monoanions undergo reversible fullerene dimerization with the formation of diamagnetic fullerene dimers upon cooling to low temperatures. These transformations are endothermic and are characterized by calorimetric studies of temperature-dependent heat capacity to determine the thermodynamic constants of these processes. − …”

Thermodynamic properties of liquid-crystalline carbosilane dendrimers of the second and the fourth generation with methoxyphenylbenzoate terminal groups

“…The calorimeter design and the operation procedure were described earlier [14,15]. The calorimeter was tested by measuring the heat capacity of special-purity copper (OSCH) and reference samples of synthetic corundum and K-2 benzoic acid.…”