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Enantioselective crystallization of chiral inorganic crystals of ε-Zn(OH)2 with amino acids.

Many inorganic materials can form crystals but little is known about their enantioselective crystallization. In this article, we report on the enantioselective crystallization of ε-Zn(OH) 2 (Wulfingite) chiral crystals using amino acids. Crystals of ε-Zn(OH) 2 were crystallized from supersaturated sodium-hydroxide and zinc-nitrate aqueous solutions in the presence of L- or D-Arginine. All our chiral measurements, such as selective chiral adsorption by circular dichroisem (CD) /chiral chromatography and polarimetry measurements, clearly show chiral discrimination during the crystallization of ε-Zn(OH) 2 . In addition, we have developed a new method for identifying chirality in crystals using electron paramagnetic resonance (EPR). Although the values of chiral induction of the ε-Zn(OH) 2 crystals we obtained are somewhat low, they are still significant since they demonstrate that enantioselectivity during crystallization of chiral inorganic crystals with chiral additives can be achieved. The method is quite general and can be applied to many chiral inorganic systems. Understanding and controlling the crystallization of chiral inorganic crystals is of importance for gaining knowledge on the interaction of chiral molecules with inorganic surfaces. This can lead to understanding basic scientific questions such as the evolution of homochirality in biomolecules and developing chiral inorganic crystals for a variety of purposes such as asymmetric catalysis, optical applications and more.