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2013) Ligand-directed assembly of distinct 1-D Cd II coordination polymers with a bent dipyridyl derivative and two isophthalates bearing different 5= 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, H 2 hip = 5-hydroxyisophthalic acid, H 3 sip = 5-sulfoisophthalic acid), have been hydrothermally synthesized and structurally characterized. Complex 1 has a comb-like 1-D coordination chain, while 2 presents a 1-D dualtrack motif. The structural modulation of the coordination polymers can be achieved by simply changing the 5-substituent of the isophthalate from a hydroxyl group to a sulfonate group. Further, supramolecular architectures with higher dimensionality are constructed via hydrogen bonding and/ or aromatic π-stacking interactions. Both complexes have been characterized by IR, microanalysis, and powder X-ray diffraction techniques. In addition, the solid fluorescence properties of both complexes have also been investigated.

The title mononuclear complex, [Zn(C11H7N6)2(H2O)2], is composed of one ZnII ion, two deprotonated ppt ligands [Hppt = 5-(pyrazin-2-yl)-3-(pyridin-4-yl)-1H-1,2,4-triazole] and two coordinating water mol­ecules. The asymmetric unit consists of one half-mol­ecule that is completed by application of a centre of symmetry. The ZnII atom is six-coordinated in an octa­hedral environment, surrounded by two O atoms in the axial positions and four N atoms in the equatorial plane. Adjacent mononuclear units are further linked via O—H⋯N hydrogen-bonding inter­actions, forming a two-dimensional network along (100).