Molecular overlapping of perylene tetracarboxylic diimides (PTCD) in Langmuir-Blodgett (LB) films is discussed. With the use of Kuhn's extended dipole model and spectral data in the visible and infrared regions, the degree of molecular overlap in a series of PTCD derivatives was determined. The results are in general agreement with the overlap values reported in X-ray studies for crystal packing of similar molecules.
Eric Johnson and Ricardo Aroca, "Molecular Orientation and Stacking of Perylenetetracarboxylic Diimide Derivatives in Langmuir-Blodgett Monolayers: Part II," Appl. Spectrosc. 49, 472-477 (1995)