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New Chiral Bis(dipolar) 6,6′‐Disubstituted Binaphthol Derivatives for Second‐Order Nonlinear Optics

Macro- and microscopic nonlinear optical properties of 6,6′-diacceptor-substituted binaphthol derivatives with C2 symmetry were measured by the Kurtz–Perry powder test (scheme, right) and electric field induced second harmonic generation (EFISHG). These derivatives are axially chiral and possess two equal donor–acceptor systems linked together, to give a V-shaped bis(dipolar) system. The use of this type of chirality (atropisomerism) ensures noncentrosymmetric packing in crystals necessary for second-harmonic generation in bulk.