Acta Crystallographica Section C
Crystal Structure Communications
Volume 59, Part 7 (July 2003)
Four 3-cyanodifurazanyl ethers: potential propellants
Abstract: In earlier papers, we described the synthesis and structures of bis(3-nitrofurazan-4-yl) ether, C4N6O7, (I), bis[3-(nitro-N,N,O-azoxy)furazan-4-yl] ether, C4N10O9, (II), and bis[3-(5H-[1,2,3]triazolo[4,5-c]furazan-5-yl)furazan-4-yl] ether, C8N14O5, (III). Here we compare the structures of (I)-(III) with those of four 3-cyanodifurazanyl ethers, namely bis(3-cyanofurazan-4-yl) ether, C6N6O3, (IV), 3-cyanofurazanyl 3-nitrofurazanyl ether, C5N6O5, (V), 3,4-bis(3-cyanofurazan-4-yloxy)furazan, C8N8O5, (VI), and bis[3-(3-cyanofurazan-4-yloxy)furazan-4-yl]diazene, C10N12O6, (VII). It was found that the geometric parameters of the difurazanyl ether fragments are similar in these structures and therefore not influenced by substituent effects; however, the conformation of this fragment is different, viz. structures (I), (III), (V) and (VI) have approximate C2 symmetry, and structures (II), (IV) and (VII) have Cs symmetry. Dense crystal packing (1.626-1.898 Mg m-3) is characteristic for all these hydrogen-free compounds. A linear correlation is also determined between crystal density and `molecular density' (M/V), where M is the mass of a molecule and V is the molecular volume.
Formula: C6N6O3, C5N6O5, C8N8O5 and C10N12O6Notes:
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.
Copyright © International Union of Crystallography