Computing the edge version of eccentric connectivityindexfor a circumcoronene series of benzenoid

Let G be a molecular graph. The edge eccentric connectivity index of G is defined as ξ_e^c (G)=∑_(fϵE(G))〖deg⁡(f)ecc(f),〗 where deg(f) is the degree of an edge f and ecc(f) is its eccentricity. In this paper, this index for a molecular gragh of benzenoid family is computed.