This work presents two unique entangled coordination
polymers based
on square Cd4-building blocks. Complex 1 represents
the first example of 2D→ 3D parallel polycatenated architecture
constructed from a 4·82-fes net, whereas
complex 2 shows an unusual (3,4)-connected
self- catenated network that can be viewed as the cross-linking of
a 2D + 2D→3D inclined polycatenation.
The title compound, [Zn(C6H4N5)2(H2O)4]·4H2O, was synthesized by the hydrothermal reaction of Zn(CH3COO)2·2H2O with 3-(2H-tetrazol-5-yl)pyridine. The ZnII ion is located on an inversion center and is coordinated by two pyridine N atoms from two 5-(3-pyridyl)tetrazolide ligands and four coordinated water molecules in a slightly distorted octahedral geometry. The dihedral angle between the pyridine and tetrazole rings is 9.920 (7)°. In the crystal, molecules are linked into a three-dimensional network by intermolecular O—H⋯O and O—H⋯N hydrogen bonds involving the tetrazole group N atoms, the aqua ligands and solvent water molecules.
The asymmetric unit of the title compound, C14H10O4, contains one half molecule, the complete molecule being generated by a twofold axis. The two benzene rings form a dihedral angle of 43.11 (5)°. Intermolecular O—H⋯O hydrogen bonds link the molecules into one-dimensional zigzag chains. These chains are further connected into two-dimensional supramolecular layers by weak π–π stacking interactions between neighbouring benzene rings, with centroid–centroid distances of 3.7648 (8) Å.
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