Hierarchical Assembly of Antiparallel Homochiral Sheets Formed by Hydrogen-Bonded Helixes of a Trapped-Valence CoII/CoIII Complex

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• 作者：Ana M. García-DeibeMatilde Fondo ; Julio Corredoira-VázquezM. Salah El Fallah ; Jesús Sanmartín-Matalobos
• 刊名：Crystal Growth & Design
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：467-473
• 全文大小：605K
• ISSN：1528-7505

文摘

On the basis of selected reagents and reaction conditions, a chiral dinuclear trapped-valence Co^II/Co^III complex was conveniently obtained {[Co₂(L)(O₂CCH₂CO₂)(H₂O)]·EtOH·1.25H₂O, being H₃L = 2-(5-bromo-2-hydroxyphenyl)-1,3-bis[4-(5-bromo-2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine)}. This complex behaves as a compact amphiphile, whose hydrophilic pole attracts ethanol and water solvates. Its crystal packing shows a hierarchical structure controlled by an amphiphatic nature. Molecules of each enantiomer are head-to-tail connected through intermolecular hydrogen bonds to give rise to infinite helixes. These helical chains are stacked in homochiral two-dimensional sheets with hydrophilic pockets, where water and ethanol solvates are trapped. Each layer displays its homoenantiomeric helixes with a parallel orientation, while their mirror helixes, which are alternate, are antiparallelly oriented.