Title:Thermodynamic Properties and Strength of Bonds in Some Organic and Bioorganic Compounds
VOLUME: 7 ISSUE: 4
Author(s):Vitaly Ovchinnikov*
Affiliation:Department of General Chemistry and Ecology, Kazan National Research Technical University, A.N. Tupolev KNITU-KAI, Kazan
Keywords:Atom, hydrocarbons, carbohydrates, free energy, enthalpy, entropy, combustion, formation,
bond strength.
Abstract:Aim: The analysis of the gaseous and condensed thermodynamic function of all
atoms of Mendeleev’s Periodic table was carried out and seventy nine equations of such type
as Δg,f,sΨo = i ± f N, in which Δg,f,sΨo is thermodynamic function, N is the number of atom
electrons and i and f are stoichiometric coefficients, have been formulated.
Method: The obtained equations can be used for the next calculation of bond strength in
heteroatomic compounds.
Observations: The strength of C-H and C-C bonds (enthalpy) in alkanes, of C-C, C-H, C-O,
C=O and O-H bonds in carbohydrates for condensed phases were calculated first time by
using Widows-Excel-function «Search of the decision by a gradient descent method».
Conclusion: The reduced magnitudes of the force of all bonds in condensed phase, compared
to gas state, designated as the strength of the bond (Sb) of carbohydrates are necessary to
explain the presence of significant hydrogen bonds, dipole-dipole- and dispersive interactions
in biochemical molecules.
