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In the centrosymmetric title coordination compound, [Er2{Fe(C5H5)(C6H4O2)}6(CH3OH)2(H2O)2]·2CH3OH, the two ErIII ions are bridged by two ferrocene­carboxyl­ate anions as asymmetrically bridging ligands, leading to dimeric cores. The ErIII ion has a distorted dodeca­hedral coordination with six coordinating O atoms derived from the ferrocene­carboxyl­ate ligands and two coordinated O atoms from one water mol­ecule and one methanol mol­ecule. The asymmetric unit comprises a half of the complex mol­ecule and a methanol solvent mol­ecule. Intra­molecular O—H...O and C—H...O inter­actions occur. In the crystal, mol­ecules are linked by inter­molecular O—H...O hydrogen bonds and C—H...O as well as C—H...π inter­actions.

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The mol­ecule of the title compound, C7H6ClNO2, is almost planar, with a dihedral angle of 3.34 (14)° between the COOMe group and the aromatic ring. In the crystal, the mol­ecules are arranged into (1\overline{1}2) layers by C—H...N hydrogen bonds and there are π–π stacking inter­actions between the aromatic rings in adjacent layers [centroid–centroid distance 3.8721 (4) Å]

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In the title coordination polymer, [Sn(CH3)3(C6H4N3)]n, the SnIV atom is five-coordinated in a distorted trigonal–bipyramidal geometry with the methyl groups in equatorial positions and two N atoms of two symmetry-related benzotriazolide anions in axial positions. The anion bridges adjacent metal atoms, forming zigzag polymeric chains parallel to [011] and [0\overline{1}1].

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The crystal structure of the title compound, C15H17N3O4, is stabilized by inter­molecular N—H...N hydrogen bonds. An intra­molecular N—H...O hydrogen bond also occurs.

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In the title compound, [Co(C18H18N2O4)Cl(H2O)]·C3H7NO, the CoIII ion is six-coordinated by a tetra­dentate 6,6′-dimeth­oxy-2,2′-[ethane-1,2-diylbis(nitrilo­methanylyl­idene)]diphenolate ligand, with a chloride ion and an aqua ligand in the apical positions. The compound crystallized as a dimethyl­formamide (DMF) monosolvate. In the crystal, complex mol­ecules are linked via O—Hwater...O hydrogen bonds to form a dimer-like arrangement. These dimers are linked via a C—H...Cl inter­action, and the DMF mol­ecule is linked to the complex mol­ecule by C—H...O inter­actions.

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The three mol­ecules in the asymmetric unit of the title compound, C3H4N2O2S, are connected via N—H...O hydrogen bonds, forming layers normal to [001]. The rings of the mol­ecules are approximately planar, with r.m.s. deviations of 0.0051 (1), 0.0044 (1) and 0.0111 (1) Å.

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The title compound, [Co(C7H5O2)2(C12H16N3O2)2(H2O)2], was obtained from a conventional solvent evaporation method. The complex mol­ecule is centrosymmetric, so pairs of equivalent ligands lie trans to each other in a slightly distorted octa­hedral CoN2O4 geometry. The CoII ion is coordinated by the pyridine N atoms from NITpPy ligands [NITpPy is 4,4,5,5-tetra­methyl-2-(pyridin-4-yl)imidazoline-1-oxyl 3-oxide), water O atoms and two monodentate benzoate O atoms. The complex mol­ecules are connected by O—H...O hydrogen bonds between water mol­ecules and benzoate ligands, forming chains parallel to [100]. π–π stacking inter­actions between the benzoate ligands with centroid–centroid distances of 3.752 (2) Å connect the chains into layers parallel to (10-1).

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In the structure of the title complex, [ZnCl2(C6H8N4)2], the ZnII atom has a distorted octa­hedral geometry. Two cis Cl ions and four N atoms belonging to two different 2-(1-hydrazinylideneeth­yl)pyrazine ligands coordinate the ZnII atom, forming two five-membered Zn—N—C—C—N rings. The dihedral angle between the planes of these metallocycles is 88.13 (4)°. The organic ligands are essentially planar (r.m.s. deviations from planarity = 0.072 and 0.040 Å). Inter­molecular N—H...N and N—H...Cl inter­actions join the mol­ecules into a three-dimensional framework.

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In the title ep­oxy monomer, C24H22O5, the dihedral angle in the biphenyl residue is 3.34 (19)°, indicating a nearly coplanar conformation; this residue is not planar with the adjacent benzene ring [dihedral angle = 58.93 (14)°]. Each of the epoxide rings is disordered. Each epoxide ring was resolved over two alternative positions with site-occupancy ratios of 0.638 (10):0.362 (10) and 0.797 (9):0.203 (9).

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In the title compound, C19H14F3N3, the dihedral angles between the mean planes of the indole ring and the 4-CF3-phenyl and imidazole rings are 54.95 (4) and 61.36 (7)°, respectively.

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In the title compound, C16H9Cl2N5O2, the folded mol­ecular conformation is characterized by a dihedral angle between the two benzene rings of 74.03 (5)°. An intra­molecular N—H...O hydrogen bond is observed between the H atom of the amide group and a nitro-group O atom. Inter­molecular C—H...O and N—H...N hydrogen bonds feature in the crystal packing.

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In the title compound, C10H6ClF3N4O3, the dihedral angle between the benzene ring and the triazolone ring is 59.9 (1)°, while the nitro substituent subtends an angle of 39.5 (1)° to the benzene ring plane. In the crystal, pairs of mol­ecules form inversion dimers via C—H...O hydrogen bonds.

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The title compound, C17H22N4O3, comprises a 1,4-diazepine ring in a twist-boat conformation fused to a pyrimidine ring. The dihedral angle between the pyrimidine and phenyl rings is 80.8 (1)°. The crystal packing features N—H...O and C—H...O hydrogen bonds.

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In the title compound, C20H11Cl2F4N3, the central pyrazolo­[1,5-a]pyrimidine unit is almost planar [the mean deviation from the best least-square plane through the nine atoms is 0.006 (2) Å]. The fluoro­benzene ring is rotated out of this plane by 10.3 (3)°, whereas the dichloro­benzene ring is rotated by 46.2 (3)°. The crystal packing is dominated by Cl...Cl inter­actions of 3.475 (3) Å and van der Waals inter­actions.

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In the title compound, C25H13Cl2F4N3, there are four planar systems, viz. three benzene rings and a pyrazolo­[1,5-a]pyrim­idine system [r.m.s. deviation = 0.002 Å]. The dihedral angle between the dichloro­phenyl ring and the unsubstituted phenyl ring is 69.95 (5)°, while that between the fluoro­phenyl ring and the unsubstituted phenyl ring is 7.97 (10)°. The crystal packing is dominated by van der Waals inter­actions. A Cl...Cl inter­action of 3.475 (3) Å also occurs.

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The title compound [systematic name: 9-(9H-fluoren-3-yl)-9H-fluorene], C26H18, was obtained unintentionally as the product of the synthesis of a compound based on fluorene-thio­phene units. The two fluorene rings are connected through C atoms in the 3- and 9'-positions, and the dihedral angle between the mean planes of the two fluorene units is 78.57 (6)°.
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