EXTENSION OF EDGE-CONNECTIVITY INDEX - RELATIONSHIPS TO LINE GRAPH INDEXES AND QSPR APPLICATIONS

The concept of edge connectivity index is extended to a series of indi ces based on adjacency between edges in various fragments of the molec ular graph. The analogous concept of vertex adjacency indices of the l ine graph of the molecular graph is also introduced. Some mathematical relations between both series of indices are found, showing that line -graph-based connectivity indices are linear combinations of edge-base d descriptors. The study of eight representative physical properties o f alkanes was used to compare the ability of both series of indices to produce significant quantitative structure-property relationship (QSP R) models.