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A novel topological index derived from eccentric connectivity index bas been proposed. The new topological index and eccentric connectivity index were correlated with eight physical properties such as the boiling point, critical temperature, critical pressure, critical volume, evaporation heat, density, heat capaci- ty, surface tension, and three thermodynamic properties suck as standard enthalpy, standard entropy and standard formation free energy or alkanes. A series of empiric equations for calculating the properties were obtaines. Correlation coefficients or nine properties were more than 0. 99. Regression analysis and calcula- tion results indicated that the topological indices were well correlated with the physico-chemical properties or alkanes, and the novel topological index was far superior to eccentric connectivity index in the correlation.
A novel topological index derived from eccentric connectivity index bas been proposed. The new topological index and eccentric connectivity index were correlated with eight physical properties such as the boiling point, critical temperature, critical pressure, critical volume, evaporation heat, density, heat capaci- ty series tension, and three thermodynamic properties suck as standard enthalpy, standard entropy and standard formation free energy or alkanes. A series of empiric equations for calculating the properties were obtaines. Correlation coefficients or nine properties were more than 0. 99. Regression analysis and calcula- tion results indicated that the topological indices were well correlated with the physico-chemical properties or alkanes, and the novel topological index was far superior to eccentric connectivity index in the correlation.