Abstract
The Padmakar-Ivan (PI) index of a graph G is defined as PI(G) = Σ e=uv [m u (e)+ m v (e)], where m u (e) is the number of edges of G lying closer to u than to v, m v (e) is defined analogously and summation goes over all edges of G. In this paper, the PI index of tetrathiafulvalene (TTF) dendrimer is computed, whereby TTF units were employed as branching centers.
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