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A novel blue luminescent high-spin iron(III) complex with interlayer O–HCl bridging: Synthesis, structure and spectroscopic studies
Auteur(s)
Basu, Chandrama
Chowdhury, Santanu
Banerjee, Rajat
Mukherjee, Soma
Date de parution
2007
In
Polyhedron, Elsevier, 2007/26/14/3617-3624
Résumé
A blue luminescent high-spin (<i>s</i> = 5/2) iron(III) complex, [FeIII(HL<sup>1</sup>)<sub>2</sub>]Cl (<b>2</b>), was synthesized with the acyclic tridentate salicylaldehyde 2-pyridyl hydrazone ligand, H<sub>2</sub>L<sup>1</sup> (<b>1</b>), and it can subsequently be deprotonated and methylated into blue luminescent iron(III) complexes, [FeIII(L<sup>2</sup>)<sub>2</sub>]Cl (<b>3</b>) and [Fe<sup>III</sup> (MeL<sup>1</sup>)<sub>2</sub>]Cl (<b>4</b>) respectively. On excitation at 390 nm, the ligand and the complexes display fluorescence in the blue region (λ<sub>em</sub> = 440–450 nm) of the spectrum. The association constant, (<i>K</i><sub>ass</sub> = 4.6421 × 10<sup>4</sup> at 298 K) and the thermodynamic parameters for complex <b>2</b> have been determined by UV–Vis spectroscopy. The iron(III)–iron(II) reduction potentials lie near – 0.2 V versus SCE. The X-ray crystal structure of the complex, [Fe<sup>III</sup> (HL<sup>1</sup>)<sub>2</sub>]Cl • H<sub>2</sub>O (<b>2</b>), was determined, revealing meridional binding of the two ligands affording a <i>cis</i>-FeN<sub>4</sub>O<sub>2</sub> geometry with alternate chlorine and water molecules at the interface of the main molecule, resulting in interesting interlayer O–HCl bridging.
Identifiants
Type de publication
journal article
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