Tetracopper complexes with two-mode cubane-like Cu4O4 core from similar hydroxyl-rich salicylaldehyde Schiff bases: Structure and magnetic properties. (28th May 2016)

• Record Type: Journal Article
• Authors: Yang, Bing; Pan, Jiali; Meng, Xianggao; Cao, Jinge; Li, Yuyi; Xiao, Fengping; Li, Dongfeng
• Is Part Of: Polyhedron. Volume 110(2016)
• Page Start: 182
• Page End: 187
• Publication Date: 2016-05-28
• Subjects: Tetracopper complexes -- Hydroxyl-rich Schiff base -- Crystal structures -- Hydrogen bonding -- Magnetic property; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2016.02.042
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Two different kinds of structures of Cu4 O4 -containing complexes resulted from the reaction of similar water-soluble hydroxyl-rich salicylaldehyde Schiff base ligands with Cu(OAc)2 ·2H2 O. Complex1 adopted in cubic Cu4 O4 structure with μ3 -alkoxo is ferromagnetic interaction between four metal centers, while complex3 with stepped-cubane structure shows antiferromagnetic interaction. Abstract: The reaction of water-soluble hydroxyl-rich salicylaldehyde Schiff base ligands with the metal salt Cu(OAc)2 ·H2 O affords three novel tetracopper complexes via solvothermal method: [Cu4 (H2 L1)4 ]·CH3 OH(1 ), [Cu4 (HL2)2 (Py)2 (OAc)2 ](2 ), [Cu4 (HL3)2 (Py)2 (OAc)2 ](3 ). The X-ray crystal structures reveal the cubane Cu4 O4 for complex1 with μ3 -alkoxo bridges and quasi-stepped cubane Cu4 O4 for2 and3 bearing two central copper atoms bridged by two alkoxy groups and two peripheral copper atoms bridged with central copper atoms by one another alkoxy oxygen. Temperature-dependent magnetic measurements indicate that the dominant ferromagnetic interactions among metal ions within the cubic core of1 with J 1 = +27.44 cm −1, J 2 = −0.21 cm −1 ( g = 2.1157) while there are antiferromagnetic interactions between two metal centers in3 with J 1 = −268 cm −1, J 2 = −297 cm −1 ( g = 2.068).