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Gautier, R. & Poeppelmeier, K. R. (2016) Packing of Helices: Is Chirality the Highest Crystallographic Symmetry? Crystals, 6 106.
Added by: Richard Baschera (2016-10-31 10:20:35) Last edited by: Richard Baschera (2016-10-31 10:33:49) |
| Type de référence: Article DOI: 10.3390/cryst6090106 Numéro d'identification (ISBN etc.): 2073-4352 Clé BibTeX: Gautier2016a Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS Mots-clés: building units, Chirality, crystal-structures, Crystallography, Helical System, Oxide-fluorides, polar, proteins, solid-state Créateurs: Gautier, Poeppelmeier Collection: Crystals |
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Chiral structures resulting from the packing of helices are common in biological and synthetic materials. Herein, we analyze the noncentrosymmetry (NCS) in such systems using crystallographic considerations. A comparison of the chiral structures built from helices shows that the chirality can be expected for specific building units such as 3(1)/3(2) or 6(1)/6(5) helices which, in hexagonal arrangement, will more likely lead to a chiral resolution. In these two systems, we show that the highest crystallographic symmetry (i.e., the symmetry which can describe the crystal structure from the smallest assymetric unit) is chiral. As an illustration, we present the synthesis of two materials ([Zn(2,2'-bpy)(3)](NbF6)(2) and [Zn(2,2'-bpy)(3)](TaF6)(2)) in which the 3(n) helices pack into a chiral structure.
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