Theoretical study on the off-resonant polarizabilities of linear, square-lattice and dendritic molecular aggregates

We investigate the intermolecular-interaction effects on the off-resonant polarizabilities (a) of fractal-dimensional (dendritic), one-dimensional (linear) and two-dimensional (square-lattice) aggregate models in order to elucidate the structure-property relation in a. As a fractal-dimensional system, we consider a D25-like dendritic molecular-aggregate model, which involves chromophores at the position of acetylene units of a phenylacetylene dendrimer D25. It is found for a dendritic aggregate that intermolecular-interaction effects more enhance the contribution to a in the core region than that in the periphery region.