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Vertex-degree-based molecular structure descriptors of benzenoid systems and phenylenes

Gutman Ivan (Faculty of Science, Kragujevac)
Furtula Boris (Faculty of Science, Kragujevac)

Several recently published papers report expressions for various vertex-degree-based molecular structure descriptors of benzenoid systems and phenylenes. We deduce here the general expression for these descriptors, and show that a simple and generally valid relation exists between such structure descriptors of phenylenes and their hexagonal squeezes.

Keywords: molecular structure descriptor, topological index, degree-based molecular structure descriptor, benzenoid system, phenylene, hexagonal squeeze