Analysis of the crystalline packing of known aza[5]helicenes is presented together with some newly synthesized diaza[5]helicenes species, characterized by NMR spectroscopy and X-ray diffraction. The comparison with carbo[5]helicenes and monoaza[5]helicenes emphasizes the importance of the "shape factor" (responsible of the isomorphism between some species in the series) as well as the lack of a unique supramolecular effect organizing the molecules in the crystals (responsible of the polymorphism observed for some compounds).
Synthesis, Crystal Structure and Crystal Packing of Diaza[5]Helicenes
BAZZINI, Cristina;CARONNA, Tullio;FONTANA, Francesca;NATALI SORA, Isabella;
2008-01-01
Abstract
Analysis of the crystalline packing of known aza[5]helicenes is presented together with some newly synthesized diaza[5]helicenes species, characterized by NMR spectroscopy and X-ray diffraction. The comparison with carbo[5]helicenes and monoaza[5]helicenes emphasizes the importance of the "shape factor" (responsible of the isomorphism between some species in the series) as well as the lack of a unique supramolecular effect organizing the molecules in the crystals (responsible of the polymorphism observed for some compounds).File allegato/i alla scheda:
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