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In the cation of the title salt, [Ag(C12H6N2O2)2](C7H3N2O7), the AgI atom is coordinated in a distorted tetra­hedral geometry by four N atoms from two 1,10-phenanthroline-5,6-dione ligands, while the 3,5-dinitro­salicylate anion has only a short contact [2.847 (6) Å] between one of its O atoms and the AgI atom. The dihedral angle between the two 1,10-phenanthroline-5,6-dione ligands is 58.4 (1)°. There is an intra­molecular O—H...O hydrogen bond in the 3,5-dinitro­salicylate anion.

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In the crystal structure of the title compound, C18H13N5·H2O, adjacent mol­ecules are linked by O—H...N and N—H...O hydrogen bonds, generating a chain propagating along [001].

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The title compound, [Cu4Br4(C21H22Br2N4)4], features a macrocyclic Cu4L4 ring system in which each CuI atom is coordinated by one bromide ion and two N atoms from two 2,2′-dimethyl-1,1′-[2,2-bis­(bromo­meth­yl)propane-1,3-di­yl]di(1H-benzimidazole) (L) ligands in a distorted trigonal–planar geometry. The L ligands adopt either a cis or trans configuration. The asymmetric unit contains one half-mol­ecule with the center of the macrocycle located on a crystallographic center of inversion. Each bromide ion binds to a CuI atom in a terminal mode and is oriented outside the ring. The macrocycles are inter­connected into a two-dimensional network by π–π inter­actions between benzimid­azole groups from different rings [centroid–centroid distance = 3.803 (5) Å.

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In the title compound, [Cd(C10H6NO2)2]n, the CdII atom is coordinated by three O atoms and two N atoms from four quinoline-3-carboxyl­ate (L) ligands, leading to a distorted trigonal–bipyramidal geometry. The L ligands link the CdII atoms into a plane parallel to (100), with one ligand being tridentate, coordinating via the N atom and chelating a second Cd atom, and the other being bidentate, bridging two Cd atoms via the N and one O atom.. This two-dimensional network extends into a double-layer network by π–π inter­actions, with centroid–centroid distances of 3.680 (2) and 3.752 (2) Å. Another type of π–π inter­action between pyridine rings [centroid–centroid distance = 3.527 (2) Å] leads to a three-dimensional supra­molecular architecture.

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In the title complex, [Mn(N3)2(C8H8N6)2], the complete molecule is generated by the application of twofold symmetry, and is in a distorted octa­hedral environment, coordinated by four N atoms of two bidentate 6-(pyridin-2-yl)-1,3,5-triazine-2,4-diamine ligands and two N atoms from two azide anions. The two chelated 6-(pyridin-2-yl)-1,3,5-triazine-2,4-diamine ligands form a dihedral angle 74.75 (5)°. The mononuclear mol­ecules are alternatively linked into layers parallel to the ac plane via N—H...N hydrogen bonds. Adjacent layers are connected into a three-dimensional supra­molecular framework by futher N—H...N hydrogen-bonding inter­actions.

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In the title compound, {[Nd3(C7H3NO4)3(OH)3]·H2O}n, the NdIII atom is eight-coordinated by the three O atoms of three asymmetrically μ3-bridging hydroxide groups, by four carboxyl­ate O atoms of four different pyridine-2,5-dicarboxyl­ate (2,5-pydc) ligands, and by the N atom of a 2,5-pydc ligand. Six Nd atoms are connected by six hydroxide groups, forming an [Nd63-OH)6] cluster unit of symmetry -3 and a slightly compressed octa­hedral geometry. Adjacent [Nd63-OH)6] clusters are connected by the 2,5-pydc ligands, via O and N atoms, forming chains along the c axis. The remaining O atoms of the 2,5-pydc ligands link these chains into a three-dimensional framework. A disordered water molecule, located on a threefold rotation axis at the opposite side of the [Nd63-OH)6] cluster and exposed to each of the three Nd atoms, completes the structure.

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The title compound, C11H7NO4·H2O, contains a 3-carb­oxy­quinolin-1-ium-2-carboxyl­ate (qda) zwitterion and one water mol­ecule. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules into inversion dimers, and these dimers are further connected by O—H...O hydrogen bonds into a three-dimensional supra­molecular architecture. In addition, π–π inter­actions occur between pyridine and benzene rings from different qda ligands [centroid–centroid distance = 3.749 (1) Å] and the dihedral angles of the –CO2H and –CO2 groups to the quinoline system are 8.47 (3) and 88.16 (6)°, respectively.

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The title compound, C21H22Br2N4·0.5H2O, contains two benzimidazole groups which may provide two potential coordination nodes for the construction of metal–organic frameworks. The mean planes of the two imidazole groups are almost perpendicular, with a dihedral angle of 83.05 (2)°, and adjacent mol­ecules are linked into a one-dimensional chain by π–π stacking inter­actions between imidazole groups of different mol­ecules [centroid-to-centroid distances of 3.834 (2) and 3.522 (2) Å].

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In the title compound, [Ag2(C10H6NO2)2]n, the AgI atom is coordinated by one N atom and two O atoms from three quinoline-3-carboxyl­ate ligands in a T-shaped fashion, with an additional Ag...Ag distance of 2.9468 (6) Å. The ligands connect the AgI atoms into a double-chain structure along [010]. Weak Ag...O inter­actions [Ag...O = 2.802 (3) and 2.877 (4) Å] link the double-chains into a layer network parallel to (101). π–π inter­actions are also observed in the layer network [centroid–centroid distances = 3.780 (3) and 3.777 (3) Å].
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