Syntheses, structures and magnetic properties of two CoII/NiII isostructural coordination polymers based on an asymmetric semirigid tricarboxylate ligand. Issue 1 (10th December 2021)

• Record Type: Journal Article
• Authors: Li, Shao-Dong; Su, Feng; Zhou, Cheng-Yong; Hu, Qi-Long; Li, Ya-Qi; Wang, Zhi-Jun
• Is Part Of: Acta crystallographica. Volume 78:Issue 1(2022)
• Page Start: 23
• Page End: 29
• Publication Date: 2021-12-10
• Subjects: cobalt(II) -- nickel(II) -- two‐dimensional coordination polymer -- semirigid ligand -- topology -- magnetism -- crystal structure; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229621012973
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : Two 2D isostructural Co II /Ni II coordination polymers were synthesized based on the 2‐(4‐carboxyphenoxy)terephthalate ligand. The complexes contain dimeric metal motifs with flying butterfly arrangements. Both of them exhibit antiferromagnetic interactions. Abstract : Two new isostructural complexes, namely, poly[aqua[μ3 ‐2‐(4‐carboxyphenoxy)terephthalato‐κ 3 O 1 : O 4 : O 4′ ](1, 10‐phenanthroline‐κ 2 N, N ′)cobalt(II)], [Co(C15 H8 O7 )(C12 H8 N2 )(H2 O)] n or [Co(μ3 ‐Hcpota)(phen)(H2 O)] n, I, and poly[aqua[μ3 ‐2‐(4‐carboxyphenoxy)terephthalato‐κ 3 O 1 : O 4 : O 4′ ](1, 10‐phenanthroline‐κ 2 N, N ′)nickel(II)], [Ni(C15 H8 O7 )(C12 H8 N2 )(H2 O)] n or [Ni(μ3 ‐Hcpota)(phen)(H2 O)] n, II, have been synthesized by solvothermal reactions. Complexes I and II were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, and powder and single‐crystal X‐ray diffraction. They both present two‐dimensional structures based on [ M 2 (μ‐COO)2 ] 2+ ( M = Co II or Ni II ) dinuclear metal units with a fes topology and a vertex symbol (4·8 2 ). Interestingly, the positions of the two dimeric metal motifs and the two partially deprotonated Hcpota 2− ligands reproduce regular flying butterfly arrangements flipped upside down and sharing wings in the ab plane. Magnetic studies indicate antiferromagnetic interactions ( J = −5.21 cm −1 for I and −11.53 cm −1 for II ) in the dimeric units, with Co…Co and Ni…Ni distances of 4.397 (1) and 4.358 (1) Å, respectively, that are related to double syn – anti carboxylate bridges.