PI index of tetrathiafulvalene dendrimers

Department of Mathematics, Statistics and Computer Science, Faculty of Science, University of Kashan.

Kashan 87317-51167, I. R. Iran

Manuscript received 5 October 2010, accepted 6 October 2010

The Padmakar-lvan (PI) index of a graph G is defined as PI(G) = ∑ _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.