Crystal structure and Hirshfeld surface analysis of the 1:3 adduct of tetra-aqua-trinitrato-neodymium(III) with 3-amino-1,2,4-triazine.

In the title compound, [Nd(NO3)3(H2O)4]·3C3H4N4, neodymium is ten-coordinate with a distorted bicapped square-anti-prismatic geometry formed from six O atoms from three nitrate ions and four O atoms from four coordinated water mol-ecules. The structure also contains neutral 3-amino-1,2,4-triazine mol-ecules which are not coordinated to the central metal atom. The coordinated water mol-ecules and nitrate ions of adjacent complexes are linked by O-H⋯O hydrogen bonds to form cyclic R22(8) ring motifs, which in turn are further connected via hydrogen bonds to generate a sheet-like structure. The triazine mol-ecules are involved in a number of hydrogen-bonding inter-actions: N-H⋯N and O-H⋯N inter-actions to form R33(9) motifs and N-H⋯N inter-actions to link the organic mol-ecules into chains. Weak C-H⋯O hydrogen bonds also occur between triazine mol-ecules and coordinated nitrate atoms. All these inter-molecular contacts contribute to the stabilization of the three-dimensional supra-molecular framework. Hirshfeld surface analysis shows that N⋯H/H⋯N and H⋯H inter-actions account for 42.9 and 20.6% of the surface, respectively.

Crystal structure and Hirshfeld surface analysis of 2,4-di-amino-6-phenyl-1,3,5-triazin-1-ium 4-methyl-benzene-sulfonate.

In the title mol-ecular salt, C9H10N5+·C7H7O3S-, the asymmetric unit consists of a 2,4-di-amino-6-phenyl-1,3,5-triazin-1-ium cation and a 4-methyl-benzene-sulfonate anion. The cation is protonated at the N atom lying between the amine and phenyl substituents. The protonated N and amino-group N atoms are involved in hydrogen bonding with the sulfonate O atoms through a pair of inter-molecular N-H⋯O hydrogen bonds, giving rise to a hydrogen-bonded cyclic motif with R22(8) graph-set notation. The inversion-related mol-ecules are further linked by four N-H⋯O inter-molecular inter-actions to produce a complementary DDAA (D = donor, A = acceptor) hydrogen-bonded array, forming R22(8), R42(8) and R22(8) ring motifs. The centrosymmetrically paired cations form R22(8) ring motifs through base-pairing via N-H⋯N hydrogen bonds. In addition, another R33(10) motif is formed between centrosymetrically paired cations and a sulfonate anion via N-H⋯O hydrogen bonds. The crystal structure also features weak S=O⋯π and π-π inter-actions. Hirshfeld surface and fingerprint plots were employed in order to further study the inter-molecular inter-actions.

Crystal structure and Hirshfeld surface analysis of 2,4-di-amino-6-methyl-1,3,5-triazin-1-ium tri-chloro-acetate monohydrate.

The asymmetric unit of the title mol-ecular salt, C4H8N5+·C2Cl3O2-·H2O, coomprises a 2,4-di-amino-6-methyl-1,3,5-triazin-1-ium cation, a tri-chloro-acetate anion and a water mol-ecule of solvation. The protonated N atom of the cation forms a hydrogen bond with a carboxyl O atom of the anion, which also acts as a hydrogen-atom acceptor with the water mol-ecule. The cations form centrosymmetric dimeric units through R22(8) N-H⋯N bond pairs and are extended into zigzag chains along the c-axis direction, also through similar cyclic R22(8) dual N-H⋯N hydrogen-bonding inter-actions. The water mol-ecule acts as a dual acceptor forming N-H⋯O hydrogen bonds between the amine groups of the cations, forming cyclic R23(8) motifs. The second H atom of the water mol-ecule also acts as a donor in an O-H⋯O hydrogen bond with the second carboxyl O atom, linking the chains along the b-axis direction. These interactions give rise to an overall three-dimensional supra-molecular structure. A Hirshfeld surface analysis was employed in order to study the inter-molecular inter-actions.