Abstract
Chiral crystals have particular interest due to their application in asymmetric catalysis, ferroelectrics, and nonlinear optics. A novel molecule, 2,2′-azobis (5-methylpyridine) ([abmpy]) was synthesized and utilized to prepare organic-inorganic hybrid crystals with anions of ZnCl42−, BiI52−, Sb2Cl82−, ZnBr42− and SnCl62−, respectively. The packing mode of [abmpyH2] cations was tuned by these anions. [abmpyH2] cations stacked in helical arrangement in [abmpyH2]ZnCl4 crystal which resulted in a chiral space group of C222, while the other four compounds crystallize in centrosymmetric point groups. The absolute structures of [abmpyH2]ZnCl4 crystals were confirmed by single-crystal X-ray using the Flack parameter method, and positive and negative Cotton effect could also be found in the CD spectra for the two enantiomers of [abmpyH2]ZnCl4 crystals. Besides, the nonlinear effect was observed for this chiral crystal.
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