Mixed-ligand metallosupramolecular complexes with Brn-terephthalic acid (n = 1 or 4) and a versatile bent dipyridyl tecton: Structural modulation by substituent effect of the ligand and metal ion |
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Authors: | Cheng-Peng Li Jing ChenMiao Du |
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Affiliation: | College of Chemistry and Life Science, Tianjin Key Laboratory of Structure and Performance for Functional Molecule, Tianjin Normal University, Tianjin 300387, PR China |
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Abstract: | This work presents a series of ZnII, CdII, CoII, and PbII supramolecular complexes assembled from a bent dipyridyl derivative 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) and different dicarboxyl co-ligands 2-bromoterephthalic acid (H2BTA) and tetrabromoterephthalic acid (H2TBTA). All products have been prepared under similar conditions and characterized by IR, microanalysis, and TG–DTA techniques. Single-crystal X-ray diffraction indicates that these complexes display mononuclear, 1-D, and 2-D coordination motifs, and diverse higher-dimensional extended networks are further constructed via additional secondary interactions such as H-bonding and aromatic stacking. Notably, in situ hydrolysis reaction of 3-bpo is observed in the PbII complex with H2TBTA, affording another dipyridyl-type ligand N,N′-bis(3-picolinoyl)hydrazine (3-bph). These results evidently reveal the significant substituent effect of terephthalic acid in structural direction of these metallosupramolecular systems that are also regulated by the selection of metal ions. |
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Keywords: | Metallosupramolecular complex Crystal structure Substituent effect Secondary interaction In situ ligand reaction |
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