Hetero-heptanuclear (Fe–Na) complexes of salicylaldehydes: crystal and molecular structure of [Fe2(3-OCH3-salo)8 · Νa5] · 3OH · 8H2Ο

Abstract

The reaction of Fe(III) with the substituted salicylaldehydes [X-saloH, where X = 3-OCH 3 (L 1 ), 5-CH 3 (L 2 ), 5-Cl (L 3 ), 5-NO 2 (L 4 )] led to the formation of four new iron(III) hetero-heptanuclear complexes (Fe-Na) under the general formula [Fe 2 (X-salo) 8 Ma 5 ] Á 3OH Á zH 2 O. The two different coordination modes of the ligand, as well as the geometry around the metal ions were deduced by X-ray structure analysis of compound 1, [Fe 2 (3-OCH 3 -salo) 8 Ma 5 ] Á 3OH Á 8H 2 O. The complexes have also been characterized by physicochemical and spectroscopic (IR, UV-Vis, Mössbauer) methods.

A Trinuclear Iron(III) Complex Containing the Semi‐Cubane [Fe3(μ3‐O)]7+ Core: Structural, Spectroscopic, Magnetic and Electrochemical Study

“…Salicylaldehydes are known to coordinate in a bidentate manner with divalent transition metals in the mono‐anionic form and to adopt a square‐planar arrangement 12, whereas no complex with trivalent 3d metal atoms could be structurally characterized. We found out that, under proper conditions, 3‐OCH 3 ‐salicylaldehyde is able to coordinate with Fe III ion in two different modes as bridging ligand, forming polynuclear complexes 13.…”

Highly efficient and facile removal of As(V) from water by using Pb‐MOF with higher stable and fluorescence

“…[ 39 ] The missing C=O stretching vibrations at 1700 cm −1 and the bands at 1632 and 1506 cm −1 for Pb (bcabsa), as well as the bands at 1633 and 1539 cm −1 for Pb (bcabsabpy) , were assigned to υ asym (COO) and υ sym (COO), respectively. [ 40,41 ] This verified that the carboxyl of H 3 bcabsa already underwent deprotonation. Of note, the bands at 1399 and 1393 cm −1 for Pb (bcabsa) and Pb (bcabsabpy) were assigned to the υ (C=C) stretching frequencies of the benzene ring.…”

“…Isotherms (bcabsabpy), were assigned to υ asym (COO) and υ sym (COO), respectively. [40,41] This verified that the carboxyl of H 3 bcabsa already underwent deprotonation. Of note, the bands at 1399 and 1393 cm À1 for Pb (bcabsa) and Pb (bcabsabpy) were assigned to the υ(C=C) stretching frequencies of the benzene ring.…”

Tetranuclear nickel(II) clusters: syntheses, crystal structures, magnetic properties and Hirshfeld surface analysis

“…The C-O stretching vibrations of free Haatp at 1248 cm -1 exhibits red shifts to 1223 cm -1 and 1235 cm -1 for 1 and 2, respectively, suggesting its participation in chelation [49,50]. The bands at 1437 cm -1 and 1437 cm -1 for 1 and 2 are assigned to the ν sym (COO) stretching frequency of CH 3 COO -and HCOO -, respectively [15,48].…”

“…The results indicate that the amino group of aatp is coordinated [46,47]. The band at 1635 cm -1 is attributable to the carbonyl bond v(C=O) of free Haatp which red shifts to 1623 cm -1 and 1616 cm -1 for 1 and 2, respectively, indicating that the ketonic oxygen of aatp is coordinated [48]. The C-O stretching vibrations of free Haatp at 1248 cm -1 exhibits red shifts to 1223 cm -1 and 1235 cm -1 for 1 and 2, respectively, suggesting its participation in chelation [49,50].…”