Cryometry and excess functions of the adduct of light fullerene C60 and arginine – C60(C6H12NaN4O2)8H8 aqueous solutions

Abstract

Cryometry investigation of C 60 (C 6 H 12 NaN 4 O 2 ) 8 H 8 -H 2 O solutions was made over concentrations ranging from 0.1 -10 g of fullerene-arginine adduct per 1 dm 3 . Freezing point depression was measured for these aqueous solutions. Excess functions for water and fullerene-arginine adduct activities, activity coefficients and excess Gibbs energy of the solutions were calculated. All solutions demonstrate huge deviations from ideality. The last fact, to our opinion, is caused by the very specific -hierarchical type of association of fullerene-arginine adducts in aqueous solution components, which is proved by the results of our visible light scattering analysis.

Cryometry data in the binary systems bis-adduct of C60 and indispensable aminoacids - lysine, threonine, oxyproline

“…For the calculation of water activity, we have used well-known equation, obtained from the equality of the chemical H 2 O potentials in pure solid ice and non-ideal liquid solution [10,11]:…”

“…Authors [10,11] calculated concentration dependencies ln γ H2O , derivatives d ln γ H2O /dX bis−adduct (numerically). Then authors [10,11] calculated the dependencies d ln γ bis−adduct /dX bis−adduct , (according to classical differential Gibbs-Duhem differential equation) and at the end by numerical integration the dependencies ln γ nabis−adduct (X bis−adduct ) were calculated. As a result, as was expected earlier, gigantic positive deviations of the solution from ideality for the functions ln γ bis−adduct were obtained ln γ bis−adduct ≈ n(10 2 ) (in Fig.…”

Cryometry data and excess thermodynamic functions in the binary system: water soluble bis-adduct of light fullerene C70 with lysine. Assymmetrical thermodynamic model of virtual gibbs energy decomposition - VD-AS

“…2 and Table. 1. Additional researchers [24,25] calculated concentration dependencies ln γ H2O , derivatives d ln γ H2O /dx nano−cluster (numerically).…”

“…), to the best of our knowledge, until this time, has not been provided, except for two original works [24,25]. In those articles, in the binary systems with the help of cryometry investigations, the authors determined the decrease in temperature for ice crystallization initiation (liquidus temperatures), water activities, water activity coefficients, and then, solving numerically the Gibbs-Duhem equation -activities and activity coefficients of fullerene derivatives.…”

Bioactivity Study of the C60-L-Threonine Derivative for Potential Application in Agriculture

“…Additionally, they possess anticancer and antioxidant activities [34,37,46] (ii) Theoretical studies of fullerene derivatives with amino acids. In particular, this group of articles is devoted to the ability of the C 60 fullerene to interact with amino acids [40], calculation of dissociation constants [41], and molecular structure of hybrid derivatives based on C 60 and amino acids [33], as well as to the investigation of physicochemical properties of water-soluble fullerene derivatives (investigation of pH, degree of association [33,[47][48][49][50][51], solubility in water, density, specific conductivity, molar conductivity, dissociation constant, activity coefficients, and size distribution) [42][43][44]. The ability of watersoluble fullerene derivatives to penetrate through the cell membranes (due to lipophilicity and nanosize), to deliver macro-and microelements and to have antioxidant activity, make it interesting to research their influence on the plant cultures.…”