Skip to main content

Research Repository

Advanced Search

Synthesis and Characterization of Late Transition Metal Complexes of Mono-Acetate Pendant Armed Ethylene Cross-Bridged Tetraazamacrocycles with Promise as Oxidation Catalysts for Dye Bleaching

Hoang, Tuyet; Mondal, Somrita; Allen, Michael B.; Garcia, Leslie; Krause, Jeanette A.; Oliver, Allen G.; Prior, Timothy J.; Hubin, Timothy J.

Authors

Tuyet Hoang

Somrita Mondal

Michael B. Allen

Leslie Garcia

Jeanette A. Krause

Allen G. Oliver

Profile Image

Dr Tim Prior T.Prior@hull.ac.uk
Senior Lecturer in Inorganic Chemistry

Timothy J. Hubin



Abstract

Ethylene cross-bridged tetraazamacrocycles are known to produce kinetically stable transition metal complexes that can act as robust oxidation catalysts under harsh aqueous conditions. We have synthesized ligand analogs with single acetate pendant arms that act as pentadentate ligands to Mn, Fe, Co, Ni, Cu, and Zn. These complexes have been synthesized and characterized, including the structural characterization of four Co and Cu complexes. Cyclic voltammetry demonstrates that multiple oxidation states are stabilized by these rigid, bicyclic ligands. Yet, redox potentials of the metal complexes are modified compared to the “parent” ligands due to the pendant acetate arm. Similarly, gains in kinetic stability under harsh acidic conditions, compared to parent complexes without the pendant acetate arm, were demonstrated by a half-life seven times longer for the cyclam copper complex. Due to the reversible, high oxidation states available for the Mn and Fe complexes, the Mn and Fe complexes were examined as catalysts for the bleaching of three commonly used pollutant model dyes (methylene blue, methyl orange, and Rhodamine B) in water with hydrogen peroxide as oxidant. The efficient bleaching of these dyes was observed.

Citation

Hoang, T., Mondal, S., Allen, M. B., Garcia, L., Krause, J. A., Oliver, A. G., …Hubin, T. J. (2023). Synthesis and Characterization of Late Transition Metal Complexes of Mono-Acetate Pendant Armed Ethylene Cross-Bridged Tetraazamacrocycles with Promise as Oxidation Catalysts for Dye Bleaching. Molecules, 28(1), Article 232. https://doi.org/10.3390/molecules28010232

Journal Article Type Article
Acceptance Date Dec 23, 2022
Online Publication Date Dec 27, 2022
Publication Date Jan 1, 2023
Deposit Date Sep 11, 2023
Publicly Available Date Sep 12, 2023
Journal Molecules
Electronic ISSN 1420-3049
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 28
Issue 1
Article Number 232
DOI https://doi.org/10.3390/molecules28010232
Keywords Oxidation catalyst; Dye bleaching; Cross-bridged tetraazamacrocycle; Transition metal complex
Public URL https://hull-repository.worktribe.com/output/4323756

Files




You might also like



Downloadable Citations