Based on topological theories of molecules and electrons,and by taking the influence of the electronegativity of heteroatoms into account,improved molecular connectivity indexes(MCIs) have been established using the resulting modified atom valences.By considering the characteristics of supercritical fluids a model,which contains information about the solute,solvent and their interaction parameters,was constructed in order to correlate the solubilities of solids in supercritical carbon dioxide.The model gave...