Strategies leading to polymerizable Cu, Fe, and Mn complexes of cross-bridged tetraazamacrocycles are being explored in our group. Monomeric complexes of these ligands are known, water stable, broad spectrum homogeneous oxidation catalysts that can use green oxidants, such as hydrogen peroxide and dioxygen, to modify a variety of organic functional groups. We have developed monomeric analogues of the known cross-bridged tetraazamacrocycles which have polymerizable alkene or alkyne pendant arms, with a goal of copolymerization with known polymer types to produce heterogeneous recyclable oxidation catalysts. CEC (Contaminants of Emerging Concern) are anthropogenic organic compounds such as dyes, pesticides, pharmaceuticals, etc., which are becoming increasingly prevalent in wastewater and tend to escape current water purification efforts. In a viable wastewater purification scheme, such catalysts would need to be made heterogeneous so that they can be recycled and used to treat multiple aliquots of wastewater. We present here our synthetic progress with alkene and alkyne pendant armed monomer, as well as our initial dye bleaching results, in the catalyzed hydrogen peroxide decolorization of known wastewater contaminants Methylene Blue, Methyl Orange, and Rhodamine B.

Ethylene cross-bridged tetraazamacrocycle transition metal complexes with alkene and alkyne pendant arms for copolymerization to produce heterogeneous catalysts for water purification

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