The F-index and coindex of V-Phenylenic Nanotubes and Nanotorus and their molecular complement graphs

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Alsharafi M. S. Y. , Alameri A. Q.

NANOSYSTEMS-PHYSICS CHEMISTRY MATHEMATICS, vol.12, no.3, pp.263-270, 2021 (Journal Indexed in ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 3
  • Publication Date: 2021
  • Doi Number: 10.17586/2220-8054-2021-12-3-263-270
  • Page Numbers: pp.263-270


The forgotten topological index was defined to be used in the analysis of chemical structures which often appear in drug molecular graphs. In this paper, we studied the F-index and F-coindex for certain important physico chemical structures such as V-Phenylenic Nanotube V PHX[m, n] and V-Phenylenic Nanotorus V PHY [m, n] and their molecular complement graph. Moreover, we computed F-polynomial of the V-Phenylenic Nanotubes and Nanotorus. These explicit formulae can correlate the chemical structure of molecular graphs of Nanotubes and Nanotorus to information about their physicochemical structure.