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Free Content Mirror Symmetry Breaking and Absolute Configuration Correlations of Fe(III) Complexes with Achiral Substituted o-Iminobenzosemiquinonato Ligands

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A pair of chiral o-iminobenzosemiquinonato Fe(III) complexes, λ-mer- [Fe(LISQ)3] and δ-mer-[Fe(LISQ)3] (LISQ: 2-phenylimino-4, 6-di-tert-butylphenol, mer: meridian configuration), were synthesized from 2-anilino-4,6-di-tert-butylphenol (H2L) and FeCl2ยท4H2O. Their absolute configurations were determined by single crystal X-ray diffraction (XRD) and solid-state circular dichroism (CD) spectra (the same single crystal for XRD was dispersed in KCl). Correlations between the absolute configurations of the chiral-atmetal o-iminobenzosemiquinonato M(III) complexes [M(LISQ)3] (M=Cr, Fe, Co) and their solid-state CD spectra were also established. Comparison between solid-state CD spectra of the bulk samples from 10 different syntheses and their single crystals were thoroughly analyzed. The solid-state CD spectra of the powdered samples from 10 different crystallizations of one product were characterized. These studies indicated that mirror symmetry breaking (MSB) occurred during the crystallization process of the Fe(III) complexes and their enantiomeric excess (ee) values were between 15% and 100%.
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Keywords: Absolute configuration; Mirror symmetry breaking; Semiquinone Fe(III) complexes; Single crystal X-ray diffraction; Solid-state CD spectroscopy

Document Type: Research Article

Publication date: June 15, 2013

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  • Acta Physico-Chimica Sinica, founded in 1985, is sponsored by the Chinese Chemical Society and organized by the College of Chemistry and Molecular Engineering, PekingUniversity. Since 1997, Acta Physico-Chimica Sinica has been indexed in SCI of ISI (US). Acta Physico-Chimica Sinica is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and material physical chemists. Manuscripts that are essentially reporting data, applications of data, or reviews of the literature are not suitable for publication in Acta Physico-Chimica Sinica.
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