Effect of temperature on the molar conductivity of aqueous solutions of sodium and calcium fullerenehexamalonates, Th-C66(COONa)12 and Th-C66((COO)2Ca)6
Literature Information
Aleksander Vrhovšek, Janez Cerar, Marija Bešter-Rogač, Jože Škerjanc
Electrical conductivity measurements on aqueous solutions of the sodium and calcium salts of fullerenehexamalonic acid, C66(COONa)12 and C66((COO)2Ca)6, were carried out at four temperatures: 5, 15, 25 and 35°C, and in the concentration range from about 0.04 to 0.0001 mol (COO−) dm−3. Few measurements were also performed at 25°C on mixed solutions of C66(COONa)12 and C66((COO)2Ca)6. The limiting equivalent conductivities of the fullerenehexamalonate anion were estimated: Λ0[1//12C66(COO−)12] = 68.9, 91.4, 115.4 and 137.2 Ω−1 cm2 mol−1, respectively, at the temperatures of our measurements. Walden's product for the fullerenehexamalonate anion is practically independent of the temperature and is close to the theoretical value predicted by the Stokes' law. Following the idea of association of counterions with the macroion we estimated the values of the molar conductivity of the fullerene macroion constituent and its transport number, assuming for the fraction of apparently free counterions the theoretical values based on the solution of the Poisson–Boltzmann equation for the spherical cell model. A reasonable concentration dependence of these properties has been observed.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











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