journal menuBuy article online - an online subscription or single-article purchase is required to access this article.
research papers
Three biguanidinium salts of the energetic dinitramide anion have been prepared and structurally characterized from room-temperature X-ray diffraction data. Biguanidinium mono-dinitramide, (BIGH)(DN), triclinic, P
, a = 4.3686 (4), b = 9.404 (2), c = 10.742 (1) Å, 
= 83.54 (1), 
= 80.386 (9), 
= 79.93 (1)°, V = 426.8 (1) Å3, Z = 2, Dx = 1.62 g cm-3. Biguanidinium bis-dinitramide, (BIGH2)(DN)2, monoclinic, C2/c, a = 11.892 (2), b = 8.131 (1), c = 13.038 (2) Å, = 115.79 (1)°, V = 1135.1 (3) Å3, Z = 4, Dx = 1.84 g cm-3. Biguanidinium bis-dinitramide monohydrate, (BIGH2)(DN)2.H2O, orthorhombic, P212121, a = 6.4201 (6), b = 13.408 (1), c = 14.584 (2) Å, V = 1255.4 (4) Å3, Z = 4, Dx = 1.76 g cm-3. All three structures are characterized by extensive hydrogen bonding. Both the mono- and diprotontated cations consist of two planar halves twisted with respect to each other. The dinitramide anion has a surprisingly variable and asymmetric structure. The two halves of the anion are twisted with respect to each other; however, the twist varies from 5.1 to 28.9°. In addition, the two ends of the anion have significantly different geometries, e.g. the `equivalent' N-N bond lengths differ by up to 0.045 Å.
, a = 4.3686 (4), b = 9.404 (2), c = 10.742 (1) Å, 
= 83.54 (1), 
= 80.386 (9), 
= 79.93 (1)°, V = 426.8 (1) Å3, Z = 2, Dx = 1.62 g cm-3. Biguanidinium bis-dinitramide, (BIGH2)(DN)2, monoclinic, C2/c, a = 11.892 (2), b = 8.131 (1), c = 13.038 (2) Å, = 115.79 (1)°, V = 1135.1 (3) Å3, Z = 4, Dx = 1.84 g cm-3. Biguanidinium bis-dinitramide monohydrate, (BIGH2)(DN)2.H2O, orthorhombic, P212121, a = 6.4201 (6), b = 13.408 (1), c = 14.584 (2) Å, V = 1255.4 (4) Å3, Z = 4, Dx = 1.76 g cm-3. All three structures are characterized by extensive hydrogen bonding. Both the mono- and diprotontated cations consist of two planar halves twisted with respect to each other. The dinitramide anion has a surprisingly variable and asymmetric structure. The two halves of the anion are twisted with respect to each other; however, the twist varies from 5.1 to 28.9°. In addition, the two ends of the anion have significantly different geometries, e.g. the `equivalent' N-N bond lengths differ by up to 0.045 Å.
Subscribe to Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
