Computing PI and Szeged indices of multiple phenylenes and cyclic hexagonal–square chain consisting of mutually isomorphic hexagonal chains

Abstract

PI and Szeged indices are two of the most important topological indices defined in chemistry. In this study, the PI and Szeged indices of linear [n]-phenylenes and a cyclic hexagonal-square chain consisting of n mutually isomorphic hexagonal chains were computed. The PI and Szeged indices of a multiple phenylene, which is the 2-dimensional case of a phenylenic nanotube and nanotorus, were determined.

Keywords

• PI index
• Szeged index
• linear [n]-phenylenes
• multiple phenylenes nanotube