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In the title compound, {[Co(C8H4O4)(C10H8N2O2)(H2O)2]·C10H8N2O2}n, the CoII atom, lying on an inversion center, is hexa­coordinated in a distorted octa­hedral geometry defined by two O atoms from two terephthalate (tp) ligands, two O atoms from two 4,4′-bipyridine N,N′-dioxide (bpydo) ligands and two water mol­ecules. The coordinated tp and bpydo ligands and uncoordinated bpydo mol­ecule all have an inversion center. The CoII atoms are connected by the tp and bpydo ligands into a layer parallel to (111). In the crystal, O—H...O hydrogen bonds link the uncoordinated bpydo mol­ecules and the layers into a three-dimensional supra­molecular structure. Intra­layer O—H...O hydrogen bonds and π–π inter­actions [centroid-to-centroid distances = 3.6643 (13) and 3.8048 (13) Å] are also observed.

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In the title compound, {[Zn(C24H15N2O4)2(H2O)2]·4C3H7NO}n, the ZnII ion is located on an inversion center and is six-coordinated by two N atoms from two ligands, two carboxylate O atoms from two other symmetry-related ligands and two O atoms from two water mol­ecules, furnishing a slightly distorted octa­hedral geometry. The ZnII atoms are connected by the bridging ligands into a layer parallel to (101). O—H...O hydrogen bonds link the layers and the dimethyl­formamide solvent mol­ecules. π–π inter­actions between the pyridine and benzene rings [centroid–centroid distances = 3.7428 (17) and 3.7619 (17) Å] and intra­layer O—H...O hydrogen bonds are also present.
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