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The aggregation of chalcogenopyrylium‐terminated heptamethine dyes in high‐chromophore density films can be substantially suppressed by attachment of rigid, bulky substituents that project out of the plane of the conjugated π‐system of the dye, allowing the retention in the solid state of favorable linear and nonlinear optical properties relevant to all‐optical signal processing (AOSP). Dye structures...
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