The Y- index and coindex of VC?C?[p, q] and HC?C?[p, q] nanotubes

Abstract

The Y-index and coindex are degree based molecular structure descriptors that have been shown to give a high degree of predictability compare to Zagreb indices and F-index and their coindices for some physicochemical properties of octane isomers. In this paper, we studied the Y ? index and Y ? coindex for certain important chemical structures like line graphs of the VC?C?[p, q] and HC?C?[p, q] nanotubes and their molecular complement graph. Moreover, we defined Y ? polynomial of graph G and applied it on the line graphs of the VC?C?[p, q] and HC?C?[p, q] nanotubes. These explicit formulae can correlate the chemical structure of molecular graph of nanotube to information about their physical structure.