Metal‐directed supramolecular architectures based on the bifunctional ligand 2, 5‐bis(1H‐1, 2, 4‐triazol‐1‐yl)terephthalic acid. Issue 2 (16th January 2020)

• Record Type: Journal Article
• Authors: Cai, Hua; Li, Na; Zhang, Nan; Yang, Zhenyun; Cao, Jing; Lin, Yating; Min, Nan; Wang, Jia
• Is Part Of: Acta crystallographica. Volume 76:Issue 2(2020)
• Page Start: 118
• Page End: 124
• Publication Date: 2020-01-16
• Subjects: topological analysis -- coordination polymer -- supramolecular network -- crystal structure -- bifunctional ligand -- terephthalic acid -- antiferromagnetic behaviour; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229620000248
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : Two Co II ‐ and Ni II ‐based coordination polymers were prepared using 2, 5‐bis(1 H ‐1, 2, 4‐triazol‐1‐yl)terephthalic acid and M (OAc)2 ·4H2 O ( M = Co and Ni). In the two complex structures, the central Co II and Ni II ions adopt distorted octahedral geometries, which are bound by the bifunctional ligands to produce a two‐dimensional network. Magnetic studies reveal that the complexes show antiferromagnetic interactions. Abstract : By the solvothermal reactions of 2, 5‐bis(1 H ‐1, 2, 4‐triazol‐1‐yl)terephthalic acid (H2 L ) with transition‐metal ions, two novel polymeric complexes, namely, poly[diaqua[μ4 ‐2, 5‐bis(1 H ‐1, 2, 4‐triazol‐1‐yl)terephthalato]cobalt(II)], [Co(C12 H6 N6 O4 )(H2 O)2 ] n, (1 ), and poly[[diaqua[μ4 ‐2, 5‐bis(1 H ‐1, 2, 4‐triazol‐1‐yl)terephthalato]nickel(II)] dihydrate], {[Ni(C12 H6 N6 O4 )(H2 O)2 ]·2H2 O} n, (2 ), were isolated. Both polymers have been characterized by FT–IR spectroscopy, elemental analysis and single‐crystal X‐ray diffraction analysis. The complexes have similar two‐dimensional layered structures and coordination modes. Furthermore, the two‐dimensional layered structures bear distinct intermolecular hydrogen‐bonding interactions and π–π stacking interactions to form two different three‐dimensional supramolecular networks based on 4 4 ‐subnets. The structural variation depends on the nature of the metal cations. The results of variable‐temperature magnetization measurements (χ M T−T and χ M −1 −T ) show that complexes (1 ) and (2 ) display antiferromagnetic behaviour.