Abstract
The neighborhood M-polynomial is effective in recovering neighborhood degree sum based topological indices that predict different physical, chemical and biological characteristics of material under investigation. In this work, the neighborhood M-polynomial of Titania nanotube TiO2 and the crystallographic structure of TiF2 are obtained. From the neighborhood M-polynomial, some neighborhood degree sum based topological indices are recovered. Effect of oxygen vacancies on outcomes is discussed. A comparative study among the findings and some well-established degree-based indices is performed. (c) 2021 The Authors. Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).