Abstract
A new series of five zinc (II) coordination polymers, namely [Zn(LI)(NO3)(OH2)]n(1), [Zn(LI)(CH3COO)]n(2), [Zn(LI)(NCS)]n(3), [Zn(LII)(CH3COO)]n(4), and {[Zn2(LII)2(N3)2] ⋅H2O}n(5), has been self-assembled from different zinc (II) salts and pyridine-hydrazine ligands {HLI = 2-pyridinecarbaldehyde isonicotinoyl hydrazone, and HLII = 2-acetyl-pyridyl-isonicotinoylhydrazone} and has been structurally characterized. In all compounds, the ligand is singly-deprotonated and coordinates to the zinc center in the enolic form (=N–N=C–O-). In other words, the pyridine-hydrazine ligand acted as a tetradentate negatively charged chelating-bridging ligand and coordinated to the metal centers in N, N, O pincer mode and the Para-nitrogen of the pyridine ring coordinated to the zinc center of the adjacent unit. In compounds (1)-(4) the ancillary ligands act as terminal ligands and the zinc centers bridging by the pyridine-hydrazine building blocks formed one-dimensional 1D coordination polymers, whereas the azide N3− anion in compound (5) further acted as a bridging agent and led to the formation of two-dimensional 2D network. A detailed analysis of Hirshfeld surfaces and fingerprint plots allows a comparison of intermolecular interactions in (1)–(5), which are crucial in building supramolecular architectures.
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