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In the title compound, cis-[FeCl2(C12H8N2)2], the Fe atom has a distorted octa­hedral coordination composed of four N atoms from two phenanthroline groups and two Cl atoms. The crystal packing is stabilized by weak π–π stacking of neighboring phenanthroline groups.

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In the title compound, {(C16H18N3OS)[PbI3]·C3H7NO}n, each PbII atom is bonded to six I atoms to form chains of trans face-shared PbI6 octa­hedra. In the crystal structure, the cations are stacked along the c axis, with significant π–π inter­actions.

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In the title compound, [Zn(C4H2O4)(C12H8N2)(H2O)]n, the octa­hedrally coordinated Zn atom is bonded to two N atoms from phenanthroline, three carboxyl O atoms and one water O atom.

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In the title complex, [Ni(C2H8N2)2(H2O)2](C10H8NO3S)2·2H2O, the Ni atom of the centrosymmetric cation has a distorted octa­hedral coordination geometry, and is bonded to four N atoms, from two diethyl­enediamine ligands, and to two water O atoms. Symmetry-related 4-aminona­phthalene-1-sulfonate anions are antiparallel. The crystal structure is stabilized by π–π inter­actions and N—H...O, O—H...O and O—H...N hydrogen bonds.

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In the title compound, [Cu(C2H8N2)2(H2O)2](C10H8NO3S)2·2H2O, the CuII complex cation, located on an inversion centre, has a distorted octa­hedral coordination geometry formed by two ethyl­enediamine and two water mol­ecules. The distance of 3.4987 (11) Å between the centroids of neighbouring parallel aromatic rings of aminona­phthalenesulfonate anions suggests the existence of π–π stacking.

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In the title complex, [Cd(C6H12N4)2(H2O)4][Cd(H2O)6](C10H8NO3S)4·6H2O, there are two types of distorted octa­hedrally coordinated Cd centers in the cations. The first Cd center is coordinated by two N atoms from two hexa­methyl­enetetra­mine mol­ecules and four water O atoms; the second Cd atom is coordinated by six water O atoms. Both cations are centrosymmetric. The 4-amino­naphthalene-1-sulfonate anions are anti­parallel. The crystal structure is stabilized by π–π inter­actions and hydrogen bonds.
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