Investigation of the effect of sodium azide on the coordination mode of flexible ONO-donor hydrazone ligand in preparing manganese coordination compounds. (1st November 2020)

• Record Type: Journal Article
• Authors: Bikas, Rahman; Darvishvand, Monireh; Kuncser, Victor; Schinteie, Gabriel; Siczek, Milosz; Lis, Tadeusz
• Is Part Of: Polyhedron. Volume 190(2020)
• Publication Date: 2020-11-01
• Subjects: Manganese coordination compounds -- Hydrazone ligand -- Crystal structure -- Spectroscopic studies -- Magnetic properties; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2020.114751
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Highlights: New manganese complexes with flexible ditopic hydrazone ligand were synthesized and characterized. The effect of the reaction condition and azide anion on the coordination mode of ligand was investigated. Crystal structure, spectroscopic and magnetic propeties of Mn complexes were investigated. Abstract: Mononuclear Mn(II) coordination compound, [Mn(H2 L)Cl2 ] (1 ), was synthesized by the reaction of H2 L and MnCl2 ·4H2 O in methanol where H2 L is tridentate ONO-donor hydrazone ligand [H2 L = ( E )- N' -(2-hydroxy-5-iodobenzylidene)isonicotinohydrazide]. The reaction of H2 L with MnCl2 ·4H2 O in the presence of excess amount of NaN3 in methanol gave an azido bridged dinuclear Mn(III) coordination compound, [Mn2 (L)(μ-N3 )2 (CH3 OH)2 ] (2 ), whereas in the presence of low amount of NaN3, a phenolate bridged dinuclear Mn(II) coordination compound, [Mn2 (HL)2 (CH3 OH)2 Cl2 ]·CH3 OH (3 ), was obtained. These compounds were characterized by elemental analysis, spectroscopic methods, single crystal X-ray analysis and magnetic measurements. The structural studies indicated that the ligand is coordinated as ONO-donor ligand in 1 –3 and behave as a neutral, dianionic and monoanionic ligand in compounds 1, 2 and 3, respectively. There is a good agreement between spectroscopic properties and structures of the compounds. Several synthetic attempts indicated that the azide anion has considerable effect on the formation of phenolate bridged dinuclear Mn(II) coordination compound which attributed to its general basic properties. Magnetic measurements indicate the formation of dinuclear molecules with ferromagnetic intramolecular couplings in the case of 2 and 3 as well as with much weaker and distributed antiferromagnetic interactions among the dinuclear units of these compounds.