Interplay of coordinative and supramolecular interactions in directing the crystal structures of copper(II)-ofloxacin complexes under co-ligand intervention |
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| Authors: | Xin Zhang Jun-Jing Han Hua Zhang Fei-Ran Li |
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| Institution: | 1. College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, MOE Key Laboratory of Inorganic–Organic Hybrid Functional Material Chemistry, Tianjin Normal University, Tianjin, 300387, People’s Republic of China
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| Abstract: | Assemblies of ofloxacin (Hoflo) with Cu(II), in the presence of the organonitrogen ligands, such as 2,2′-bipyridyl (bpy), 4,4′-dimethyl-2,2′-bipyridine (dmbpy), and 8-hydroxyquinoline (hq), under similar conditions, yield a series of three coordination complexes, Cu(oflo)(bpy)(H2O)](ClO4)(H2O)1.5 (1), Cu(Hoflo)(dmbpy)(ClO4)](ClO4)(H2O)2 (2), and Cu(oflo)(hq)](ClO4)(H2O)2 (3). All three complexes have been structurally determined and characterized by physico-chemical and spectroscopic methods. All of the Cu(II) atoms adopt the similar square pyramidal coordination geometries. However, when considering the longer Cu–O contacts in 2, its coordination geometry turns out to be distorted octahedral and a binuclear motif is afforded. The results reveal that, distinct extended network architectures of 1D (for 1) and 2D (for 2 and 3) are further constructed with the aid of weak secondary interactions of H-bonding and aromatic stacking, by introducing various heterocyclic co-ligands. The thermal stabilities of the complexes are described and discussed. |
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