Abstract
Reaction of FeCl<sub>2</sub>.4H<sub>2</sub>O with 2-(-(2-(-2-hydroxy-3-methoxybenzylideneamino)phenylimino)methyl)-6-methoxyphenol (H<sub>2</sub>L) gives the metalloligand [Fe(L)].(H<sub>2</sub>O) (1). Reaction of metalloligand (1) with three fold of sodium dicyanamide Na[N(CN)<sub>2</sub>] gives the new tetranuclear compound [{Fe<SUP>II</SUP>Na<SUP>I</SUP>(L)(EtOH)(HN(CN)<sub>2</sub>)}(<i>μ</i>-O){Fe<SUP>III</SUP>Na<SUP>I</SUP>(L)(NO<sub>3</sub>)]}]<sub>n</sub> (2) in which one of the two irons is oxidized to +3. Suitable crystals of (2) were grown by slow evaporation of ethanol solution during two weeks. The metalloligand (1) and the tetranuclear (2) complexes are characterized by IR and physical measurement. Spectroscopic evidence indicated that the Schiff base H<sub>2</sub>L behave an N<sub>2</sub>O<sub>2</sub>O’<sub>2</sub> coordination tetradentate ligand. The structure of (2) was elucidated by X-ray diffraction analysis. The asymmetric unit of the compound contains two dideprotonated ligand molecules, two iron ions, one hexacoordinated sodium ion, one heptacoordinated sodium ion, one bidentate nitrate group, one monodentate dicyanamide unit, one coordinated ethanol molecule and an O<sup>2-</sup> ion which acts as a bridge between the Fe<SUP>II</SUP> and the Fe<SUP>III</SUP> of two entities: [Fe<SUP>II</SUP>Na<SUP>I</SUP>(L)(EtOH)(HN(CN)<sub>2</sub>)] and [Fe<SUP>III</SUP>Na<SUP>I</SUP>(L)(NO<sub>3</sub>)]. Bridge Fe—O(<i>μ</i>) bond lengths are 1.7813(14) and 1.7856(13) Å and bridging angle Fe—O—Fe is 144.78(8)°. The second terminal cyano group of the dicyanamide link another molecule complex through the heptacoordinated Na<SUP>I</SUP> leading a polymeric structure. Intermolecular hydrogen bond connect the polymeric chains to develop a three dimensional structure.
Highlights
Bi-compartmental Schiff bases are widely used in the design of homo-polynuclear and hetero-polynuclear complexes owing to their peculiar physicochemical properties [1,2,3,4,5]
In this article we report a hetero-polynuclear species [{FeIINaI(L)(EtOH)(HN(CN)2)}( -O){FeIIINaI(L)(NO3)]}]n (2) obtained using the metalloligand [Fe(L)].(H2O) (1) and Na(N(CN)2) (Figure 1)
General Information o-Vanillin and 1,3-diaminobenzene, iron chloride tetrahydrate, and sodium dicyanamide were purchased from Sigma-Aldrich and used as received without further purification
Summary
Bi-compartmental Schiff bases are widely used in the design of homo-polynuclear and hetero-polynuclear complexes owing to their peculiar physicochemical properties [1,2,3,4,5]. This development results in the association of metal ions with different nature and ligands which can yield molecular entities with great interest in the fields of molecular magnetism [6,7,8,9], optics [10,11,12], biology [13], absorption [14], catalysis [15] and luminescence [16, 17].
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