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We present a model for molecular materials made up of polar and polarizablemolecular units. A simple two state model is adopted for each molecular siteand only classical intermolecular interactions are accounted for, neglectingany intermolecular overlap. The complex and interesting physics driven byinteractions among polar and polarizable molecules becomes fairly transparentin the adopted model. Collective effects are recognized in the large variationof the molecular polarity with supramolecular interactions, and cooperativebehavior shows up with the appearance, in attractive lattices, of discontinuouscharge crossovers. The mean-field approximation proves fairly accurate in thedescription of the gs properties of MM, including static linear and non-linearoptical susceptibilities, apart from the region in the close proximity of thediscontinuous charge crossover. Sizeable deviations from the excitonicdescription are recognized both in the excitation spectrum and in linear andnon-linear optical responses. New and interesting phenomena are recognized nearthe discontinuous charge crossover for non-centrosymmetric clusters, where theprimary photoexcitation event corresponds to a multielectron transfer.Comment: 14 pages, including 11 figure

Supramolecular interactions in clusters of polar and polarizable molecules