Crystallographic study of the energetic salt 1,2,4-triazolium perchlorate

Syntheses and crystal structures of 4-benzyl-1-ethyl-1,2,4-triazolium bromide and its corresponding NHC complexes of rhodium and iridium

The syntheses and crystal structures of a triazolium salt, 4-benzyl-1-ethyl-1,2,4-triazolium bromide, C11H14N3 +·Br- (2), and the corresponding N-heterocyclic carbene complexes, (4-benzyl-1-ethyl-1,2,4-triazol-5-yl-idene)chlorido-[(1,2,5,6-η)-cyclo-octa-1,5-diene]rhodium(I), [RhCl(C8H12)(C11H13N3)] (3), (4-benzyl-1-ethyl-1,2,4-triazol-5-yl-idene)[(1,2,5,6-η)-cyclo-octa-1,5-diene](tri-phenyl-phosphane)iridium(I) tetra-fluorido-borate, [Ir(C8H12)(C11H13N3)(C18H15P)]BF4 (5), and (4-benzyl-1-ethyl-1,2,4-triazol-5-yl-idene)[(1,2,5,6-η)-cyclo-octa-1,5-diene](tri-cyclo-hexyl-phosphane)iridium(I) tetra-fluorido-borate dicholoro-methane sesquisolvate, [Ir(C8H12)(C11H13N3)(C18H33P)]BF4·1.5CH2Cl2 (6), are presented. Complexes 2 and 6 crystallize in the monoclinic space group P21/c, complex 3 in the triclinic space group P1 and complex 5 in the triclinic space group P1 with two mol-ecules in the asymmetric unit. The three metal complexes 3, 5, and 6 have a distorted square-planar geometry around the metal ions. The N1-C1-N3 bond angle in the triazolium salt 2 is 107.1 (2)° and is observed in the range of 102.2 (3) to 103.8 (5)° in the NHC ligands in complexes 3, 5, and 6. The two substituent 'wing tips' in the NHC ligand (N-ethyl and N-benz-yl) are oriented in an anti-arrangement in compounds 2 and 3, a syn-arrangement in compound 6, and both syn and anti-arrangements in the two independent ion pairs in compound 5. All structures exhibit non-classical hydrogen-bonding inter-actions with the most acidic hydrogen atoms in complexes 2 and 3 playing critical roles in the orientations of structural units.

4-(4-tert-Butyl-benz-yl)-1-neopentyl-1,2,4-triazolium bromide

The title 1,2,4-triazolium salt, C18H28N3 +·Br-, crystallizes in the monoclinic space group Pc. The extended structure exhibits a short inter-molecular inter-action between a heterocyclic C-H group and a bromide ion (H⋯Br = 2.57 Å). Additional weaker inter-actions exist between the other heterocyclic C-H group, an alkyl C-H group and bromide ions.

Synthesis and crystal structure of 1H-1,2,4-triazole-3,5-di-amine monohydrate

The title compound, a hydrate of 3,5-di-amino-1,2,4-triazole (DATA), C2H5N5·H2O, was synthesized in the presence of sodium perchlorate. The evaporation of H2O from its aqueous solution resulted in anhydrous DATA, suggesting that sodium perchlorate was required to precipitate the DATA hydrate. The DATA hydrate crystallizes in the P21/c space group in the form of needle-shaped crystals with one DATA and one water mol-ecule in the asymmetric unit. The water mol-ecules form a three-dimensional network in the crystal structure. Hirshfeld surface analysis revealed that 8.5% of the inter-molecular inter-actions originate from H⋯O contacts derived from the incorporation of the water mol-ecules.

1-Ethyl-4-isopropyl-1,2,4-triazolium bromide

An ionic compound consisting of a triazolium cation and bromide anion, C7H14N3 +·Br-, has been synthesized and structurally characterized using single-crystal X-ray diffraction and NMR. The compound crystallizes in the monoclinic space group P21/m with the non-hydrogen atoms of one cation lying on general positions and the others lying on a mirror plane. One bromide ion also lies on the mirror. The extended structure exhibits only weak inter-molecular inter-actions between heterocyclic C-H groups and Br- ions.