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    Chiral Crystal Structure of a <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> Kryptoracemate Iron(II) Complex with an Unsymmetric Azine Ligand and the Observation of Chiral Single Crystal Circular Dichroism

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    A chiral complex, [Fe­(HL)<sub>2</sub>]­(PF<sub>6</sub>)<sub>2</sub> (<b>1</b>), where HL denotes 2-pyridylmethylidenehydrazono-4-(2-methylimidazolyl)­methane, was prepared. X-ray structure analysis revealed that it crystallizes as a kryptoracemate of sesquihydrate chiral crystals in the orthorhombic noncentrosymmetric space group <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> (<i>Z</i> = 8, <i>Z</i>′ = 2). Two diastereomeric cationic complexes with opposite configuration reside within the asymmetric unit. KBr pellets prepared using selected single crystals showed enantiomorphous circular dichroism patterns
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