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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
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Catégories: INTERNATIONAL, MIOPS
Mots-clés: building units, Chirality, crystal-structures, Crystallography, Helical System, Oxide-fluorides, polar, proteins, solid-state
Créateurs: Gautier, Poeppelmeier
Collection: Crystals
Consultations : 2/638
Indice de consultation : 4%
Indice de popularité : 1%
Résumé     
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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