Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands

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Title:Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands
Creators:
Šima, Jozef
Lauková, Dáša
Brezová, Vlasta
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 66, 1, pp. 109-118
Uncontrolled Keywords:Iron(III) complexes, EPR spin trapping, Chelates, Mechanism, Salen complexes, Iodo ligand, Photoreduction, Schiff bases

Abstract

Photoredox reactions occurring in irradiated methanolic solutions of <i>trans</i>-[Fe<sup>III</sup>(R,R'-salen)(CH<sub>3</sub>OH)I], where R,R'-salen<sup>2-</sup> are <i>N</i>,<i>N'</i>-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N<sub>2</sub>O<sub>2</sub>-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH<sub>3</sub>), 3-OCH<sub>3</sub>, 5-OCH<sub>3</sub>, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, <sup>•</sup>CH<sub>2</sub>OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH<sub>2</sub>O is close to 2&nbsp;:&nbsp;1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands. <p>

Title:Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands
Creators:
Šima, Jozef
Lauková, Dáša
Brezová, Vlasta
Uncontrolled Keywords:Iron(III) complexes, EPR spin trapping, Chelates, Mechanism, Salen complexes, Iodo ligand, Photoreduction, Schiff bases
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:66
Number:1
Page Range:pp. 109-118
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20010109UNSPECIFIED
ID Code:1779
Item Type:Article
Deposited On:06 Feb 2009 17:12
Last Modified:06 Feb 2009 16:12

Citation

Šima, Jozef; Lauková, Dáša; Brezová, Vlasta (2001) Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands. Collection of Czechoslovak Chemical Communications, 66 (1). pp. 109-118. ISSN 0010-0765

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