Acta Cryst. (2003). C59, o383-o387 [ doi:10.1107/S0108270103009521 ]
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 C10N12O6
Structure factor file (CIF format) (72.6 kbytes)
Structure factor file (CIF format) (70.7 kbytes)
Structure factor file (CIF format) (72.5 kbytes)
Structure factor file (CIF format) (65.6 kbytes)
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