Spectroscopic studies on charge-transfer complexes formed in the reaction of ferric(III) acetylacetonate with σ- and π-acceptors

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 60; no. 7; pp. 1579 - 1586
• Main Authors: Teleb, S.M., Refat, M.S.
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 01.06.2004
• Subjects: Charge-transfer; Electrochemistry; Electron Transport; Far-infrared; Ferric Compounds - chemistry; Ferric(III) acetylacetonate; Hydroxybutyrates - chemistry; Pentanones - chemistry; Spectrophotometry, Ultraviolet; Spectroscopy, Fourier Transform Infrared; Triiodide; π-Acceptors; Charge-transfer; Ferric(III) acetylacetonate; Far-infrared; π-Acceptors; Triiodide
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2003.08.018

The reaction of ferric(III) acetylacetonate (donor), Fe(acac) 3, with iodine as a σ-acceptor and with other different π-acceptors have been studied spectrophotometrically at room temperature in chloroform. The π-acceptors used in this investigation are 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), p-chloranil and 7,7′,8,8′-tetracyanoquinodimethane (TCNQ). The results indicate the formation of 1:1 charge-transfer complexes with a general formula, [Fe(acac) 3 (acceptors)]. The iodine complex was shown to contain the triiodide species, [Fe(acac) 3] 2I +I 3 −, based on the electronic absorptions as well as on the Far-infrared absorption bands characteristic for the non-linear triiodide species, I 3 −, with C 2v symmetry. The proposed structure of this complex is further supported by thermal and middle infrared measurements.