New Molecular Descriptors Relevant to Physical Properties

New molecular descriptors based on statistical descriptions of the local ionization potential, local electron affinity and the local polarizability at the surface of the molecule are proposed. The significance of these descriptors has been tested by calculating them for the Maybridge database in addition to our set of 26 descriptors described previously. The new descriptors show little correlation with those already in use. Furthermore, the principal components of the extended set of descriptors for the Maybridge data show that especially the descriptors based on the local electron affinity extend the variance in our set of descriptors, which we have previously shown to be relevant to physical properties. The first seven principal components are shown to be most significant. As an example of the usefulness of the new descriptors, we have set up QSPR models for boiling point using the both the old and new descriptors.