title: Variable connectivity index as a tool for modeling structure-property relationships.
abstract: We report on the calculation of normal boiling points for a series of n = 58 aliphatic alcohols using the variable connectivity index in which variables x and y are used to modify the weights on carbon (x) and oxygen atoms (y) in molecular graphs, respectively. The optimal regressions are found for x = 0.80 and y = -0.90. Comparison is made with available regressions on the same data reported previously in the literature. A refinement of the model was considered by introducing different weights for primary, secondary, tertiary, and quaternary carbon atoms. The standard error in the case of the normal boiling points of alcohols was slightly reduced with optimal weights for different carbon atoms from s = 4.1 degrees C (when all carbon atoms were treated as alike) to s = 3.9 degrees C.
authors.affiliation: National Institute of Chemistry, Ljubljana, Slovenia. mrandic@msn.com
authors.forename: Milan
authors.initials: M
authors.lastname: Randić
authors.forename: Matevz
authors.initials: M
authors.lastname: Pompe
authors.forename: Denise
authors.initials: D
authors.lastname: Mills
authors.forename: Subhash C
authors.initials: SC
authors.lastname: Basak
mesh_terms: D005233:Fatty Alcohols / Q000737:chemistry*; D008956:Models, Chemical; D021281:Quantitative Structure-Activity Relationship; D044366:Transition Temperature
chemical_list: D005233:Fatty Alcohols