The molecules of the title compound pair up to form carboxylic acid–carboxylic acid homodimers in the crystal structure.
The title compound, C13H10BrNO2, was obtained by the reaction of 2,5-dibromobenzoic acid and aniline. The molecule is twisted with a dihedral angle between the aromatic rings of 45.74 (11)° and an intramolecular N—H⋯O hydrogen bond is seen. In the crystal, pairwise O—H⋯O hydrogen bonds generate carboxylic acid inversion dimers.
The structure of 2-ferrocenyl-2-[(2-ferrocenylethenyl)(morpholin-4-yl)methyl]-1,3-dithiolane, is described. In the crystal, cyclopentadienyl-C—H⋯O(morpholinyl) interactions feature within helical chains parallel to the c-axis direction. The chains are connected by methylene- and cyclopentadienyl-C—H⋯O(cyclopentadienyl) interactions.
The molecular structure of 2-ferrocenyl-2-[(2-ferrocenylethenyl)(morpholin-4-yl)methyl]-1,3-dithiolane, [Fe2(C5H5)2(C19H21NOS2)] or C29H31Fe2NOS2, has the ferrocenyl fragments in a trans disposition with respect to the vinyl group. One of the methylene groups is disordered over two sites with occupancies of 0.782 (13):0.218 (13). In the crystal, cyclopentadienyl-C—H⋯O(morpholinyl) interactions feature within helical chains parallel to the c-axis direction. The chains are connected by methylene- and cyclopentadienyl-C—H⋯O(cyclopentadienyl) interactions.
The structure of the title compound, [Ag2(NO3)2(C14H18N2)2] n , contains subtle differences in ligand, metal, and counter-anion coordination. One quinoxaline ligand uses one of its quinoxaline N atoms to bond to one silver cation. That silver cation is bound to a second quinoxaline which, in turn, is bound to a second silver atom, thereby using both of its quinoxaline N atoms. A nitrate group bonds with one of its O atoms to the first silver and uses the same oxygen to bond to a silver atom (related by symmetry to the second), thereby forming an extended network. The second nitrate group on the other silver bonds via two nitrate O atoms; one silver cation therefore has a coordination number of three whereas the second has a coordination number of four.
The structure of the title compound, [C14H18N2)2Ag2](NO3)2, contains subtle differences in ligand, metal, and counter-anion coordination. One quinoxaline ligand uses one of its quinoxaline N atoms to bond to one silver cation. That silver cation is bound to a second quinoxaline which, in turn, is bound to a second silver atom; thereby using both of its quinoxaline N atoms. A nitrate group bonds with one of its O atoms to the first silver and uses the same oxygen to bond to a silver atom (related by symmetry to the second), thereby forming an extended network. The second nitrate group on the other silver bonds via two nitrate O atoms; one silver cation therefore has a coordination number of three whereas the second has a coordination number of four. One of the quinoxaline ligands has a disordered ethyl group.
The bis-chelated mononuclear nickel(II) complex shows inversion symmetry, with the dithiocarbazato ligand in the usual trans configuration and the central metal cation in a square-planar coordination environment.
The central NiII atom in the title complex, [Ni(C13H25N2S2)2], is located on an inversion center and adopts a roughly square-planar coordination environment defined by two chelating N,S donor sets of two symmetry-related ligands in a trans configuration. The Ni—N and Ni—S bond lenghts are 1.9193 (14) and 2.1788 (5) Å, respectively, with a chelating N—Ni—S bond angle of 86.05 (4)°. These data are compared with those measured for similar dithiocarbazato ligands that bear n-octyl or n-hexyl alkyl chains. Slight differences are observed with respect to the phenylethylidene derivative where the ligands are bound cis relative to one another.
The coordination geometry of the pentacoordinated SiIV atom in the title complex is a distorted trigonal bipyramid.
The title SiIV complex, C16H21NO3Si, is built up by a tridentate dinegative Schiff base ligand bound to a silacyclohexane unit. The coordination geometry of the pentacoordinated SiIV atom is a distorted trigonal bipyramid. The presence of the silacyclohexane ring in the complex leads to an unusual coordination geometry of the SiIV atom with the N atom from the Schiff base ligand and an alkyl-C atom in apical positions of the trigonal bipyramid. There is a disorder of the methyl group at the imine bond with two orientations resolved for the H atoms [major orientation = 0.55 (3)]. In the crystal, C—H⋯O interactions are found within corrugated layers of molecules parallel to the ab plane.
There are no significant π–π or C—H⋯π interactions in the extended structure of the title compound.
In the title compound, C26H18BrN, the dihedral angles between the anthracene ring system and the phenyl rings are 89.51 (14) and 74.03 (15)°. In the extended structure, a weak C—H⋯Br interaction occurs, which generates [100] chains, but no significant π–π or C—H⋯π interactions are observed.
In the cation of the title complex, the central palladium(II) atom is surrounded by two bidentate ligands, 2,2′-bipyridine and 4,4′-dimethoxy-2,2′-bipyridine, in a distorted square-planar environment.
In the title complex salt, [Pd(C10H8N2)(C12H12N2O2)](CF3SO3)2, the palladium(II) atom is fourfold coordinated by two chelating ligands, 2,2′-bipyridine and 4,4′-dimethoxy-2,2′-bipyridine, in a distorted square-planar environment. In the crystal, weak π–π stacking interactions between the 2,2′-bipyridine rings [centroid-to-centroid distances = 3.8984 (19) Å] and between the 4,4′-dimethoxy-2,2′-bipyridine rings [centroid-to-centroid distances = 3.747 (18) Å] contribute to the alignment of the complex cations in columns parallel to the b-axis direction.
Both molecules in the asymmetric unit of the title compound are twisted. In the crystal, weak C—H⋯π interactions link the molecules into a three-dimensional network.
The title pyrene-fused spiropyran derivative, C30H25NO, crystallizes with two molecules in the asymmetric unit with dihedral angles between their fused-ring sub units of 76.20 (8) and 89.38 (9)°. In the crystal, weak C—H⋯π interactions link the molecules into a three-dimensional network.
The title compound, C14H12O4, was prepared via alkylation of 4-hydroxy-3-methoxybenzoic acid with propargyl bromide in the presence of K2CO3.
The title compound, C14H12O4, comprises of two crystallographically independent molecules in the asymmetric unit, linked via C—H⋯O interactions to form dimeric entities. The allylic groups are twisted out of the phenyl planes with dihedral angles varying between 7.92 (13) and 25.42 (8)°. In the crystal, the packing follows a zigzag pattern along the c-axis direction. The absolute configuration of the sample could not be determined reliably.
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