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 Coup>II up>/Coup>III up> complex was conveniently obtained {[Coub>2 ub>(L)(Oub>2 ub>CCHub>2 ub>COub>2 ub>)(Hub>2 ub>O)]·EtOH·1.25Hub>2 ub>O, being Hub>3 ub>L = 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.