The Journal of Physical Chemistry B · 2005 · 19 citations · 16 references
Natural SciencesChemistryPhysicsMolecular PhysicsOptical MaterialsSupramolecular ChemistryMolecular BondingMolecular StructureNonlinear OpticsOrganic SemiconductorsSupramolecular MaterialsSupramolecular PolymersConjugated MoleculesExciton DelocalizationMolecular Nonlinear OpticsMolecular WiresNonlinear Optical PropertiesOptical PropertiesOrganic Nonlinear Optical MaterialsPalladium-catalyzed Cross-coupling
A series of oligomers consisting of ethynyl-linked azobenzene units was prepared using Pd-catalyzed cross coupling. The linear and nonlinear optical properties of the oligomers were investigated. The molecular second hyperpolarizability, gamma, followed the power law gamma proportional, variant n(2.12+/-0.05) (n is the number of repeat units) for unusually large molecular lengths exceeding 360 conjugated bonds (>49 nm). The exceptional exciton delocalization length is attributed to the rigidity of the conjugated backbone.
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