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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Abstract
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
