Examinando por Autor "Alvarez-Thon, L."
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Ítem 2-[2-(3-Chloro-phen-yl)hydrazinyl-idene]-1,3-diphenyl-propane-1,3-dione(International Union of Crystallography, 2011-06) Bustos, C.; Alvarez-Thon, L.; Cárcamo, J.; Ibãez, A.; Sánchez, C.The mol-ecular structure of the title compound, C21H 15ClN2O2, features one strong intra-molecular N - H⋯O resonance-assisted hydrogen bond (RAHB). In the crystal, mol-ecules form inversion-related dimers via pairs of weak inter-molecular N - H⋯O contacts. These dimers are further stabilized via three weak C - H⋯O contacts, developing the three-dimensional structure.Ítem 2-[2-(4-Acetylphenyl)hydrazinylidene]-1,3-diphenylpropane-1,3-dione(International Union of Crystallography, 2011-08) Bustos, C.; Barría, D.; Alvarez-Thon, L.In the title compound, C 23H 18N 2O 3, the inter-planar angle between the benzoyl units is 80.51 (6)° while the dihedral angles between the hydrazinyl-idene and benzoyl groups are 43.43 (6) and 54.16 (6)°. In the crystal, a strong resonance-assisted intra-molecular N - H⋯O hydrogen bond is observed. The molecules form an inversion dimer via a pair of weak C - H⋯O hydrogen bonds and a π-π inter-action [centroid-centroid distance of 3.5719 (10) Å]. These dimers are linked via weak C - H⋯O contacts, forming chains along the b axis.Ítem 2-[2-(4-Bromophenyl)hydrazinylidene]-1,3-diphenylpropane-1,3-dionec(International Union of Crystallography, 2011-06) Bustos, C.; Alvarez-Thon, L.; Cárcamo, J.; Garland, M.; Sánchez, C.The conformation of the title molecule, C21H 15BrN2O2, is stabilized by a weak intra-molecular C-H⋯N hydrogen bond and a strong resonance-assisted N-H⋯O intra-molecular hydrogen bond. In the crystal, the molecules are linked by weak intermolecular C-H⋯O inter-actions, forming zigzag chains along the b axis.Ítem 2-[2-(4-Nitro-phen-yl)hydrazinyl-idene]-1,3-diphenyl-propane-1,3-dione(International Union of Crystallography, 2011-07) Bustos, C.; Alvarez-Thon, L.; Barría, D.; Garland, M.; Sánchez, C.In the mol-ecular structure of the title compound, C 21H 15N 3O 4, the inter-planar angle between the benzoyl units is 89.7 (1)°. The corresponding angles between the phenyl-hydrazono and the benzoyl groups are 31.4 (3) and 60.8 (2)°, respectively. In the crystal, a strong resonance-assisted intra-molecular hydrogen bond (N - H⋯O) and a weak intra-molecular hydrogen bond (C - H⋯N) strongly affect the observed conformation of the mol-ecule. The crystal packing is determined by a strong inter-molecular hydrogen bond (N - H⋯O), giving rise to a helical chain along the a axis. In addition, two weak inter-molecular contacts (C - H⋯O) are observed.Ítem A second monoclinic polymorph of 2-[2-(4-meth-oxy-phen-yl)hydrazinyl-idene] -1,3-diphenyl-propane-1,3-dione(International Union of Crystallography, 2011) Bustos, C.; Alvarez-Thon, L.; Barría, D.; Cárcamo, J.; Garland, M.The title compound, C 22H 18N 2O 3 is the second monoclinic polymorph (P21/c) of the compound, the first being reported in space group P21 [Bertolasi et al. (1993). J. Chem. Soc. Perkin Trans. 2, pp. 2223-2228]. In the mol-ecular structure of the title compound, the inter-planar angle between the benzoyl units is 80.04 (5)°, while the corresponding angles between the phenyl-hydrazinyl-idene and benzoyl groups are 36.11 (5) and 55.77 (2)°. A strong resonance-assisted intra-molecular N - H⋯O hydrogen bond is found. In the crystal, the entire supra-molecular structure is constructed by weak inter-molecular C - H⋯O inter-actions and an inter-ring π-π inter-action [centroid-centroid distance = 3.6088 (8) Å].Ítem (Acetyl-acetonato)dibromido[2,2-diphenyl-hydrazin-1-ido(1-)][2, 2-diphenyl-hydrazin-1-ido(2-)]molybdenum(VI)(International Union of Crystallography, 2011-06) Bustos, C.; Alvarez-Thon, L.; Ibãez, A.; Sánchez, C.In the title compound, [MoBr2(C12H11N 2)(C12H10N2)(C5H 7O2)], the MoVI atom is six-coordinated in a distorted octa-hedral geometry by two N atoms from the diphenyl-hydrazide(1-) and diphenyl-hydrazide(2-) ligands, two O atoms from a bidentate acetyl-acetonate ligand and two Br- ions. The mol-ecules form an inversion dimer via a pair of weak C - H⋯O hydrogen bonds and a π-π stacking inter-action with a centroid-centroid distance of 3.7401 (12) Å. Weak intra-molecular C - H⋯Br inter-actions and an intra-molecular π-π stacking inter-action with a centroid-centroid distance of 3.8118 (15) Å are also observed.