Event Title

Synthesis and Characterization of PDI Metallo-enzyme Mimics

Research Mentor(s)

Kristopher Aguayo

Description

The discovery of inorganic fertilizers in the early 20th century gave rise an increase in agricultural production. This increase in production skyrocketed the population from 1.6 billion people to six billion. One such fertilizer is nitrate. Unfortunately, excessive use of it as a fertilizer results in leeching into soil and streams. The solution to such problem is to reduce nitrate to less harmful forms such as nitrogen containing gasses. This is known as the denitrification step of the nitrogen cycle and is achieved by nitrate reductase, an enzyme found in bacteria. The rate at which this process occurs is much slower than the rate at which humans use nitrate, therefore an excess of nitrate is often found in soils. Finding methods to reduce nitrate to less harmful forms of nitrogen is the focus of our lab's research. We use pyridinediimine(PDI)-metal complexes with transition metals to reduce nitrate. These metals have been chosen due to their redox potential and their relative cheapness. The PDI ligand can act as an electron reservoir allowing the complex to become highly reduced. Our lab as reported iron, zinc, and copper PDI complexes and have recently begun to expand to other metals transition metals, specifically cobalt and manganese. The manganese and cobalt PDI complexes have been synthesized and are characterized through spectroscopic techniques, utilizing nuclear magnetic resonance and infrared spectroscopy.

Document Type

Event

Start Date

May 2018

End Date

May 2018

Department

Chemistry

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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Synthesis and Characterization of PDI Metallo-enzyme Mimics

The discovery of inorganic fertilizers in the early 20th century gave rise an increase in agricultural production. This increase in production skyrocketed the population from 1.6 billion people to six billion. One such fertilizer is nitrate. Unfortunately, excessive use of it as a fertilizer results in leeching into soil and streams. The solution to such problem is to reduce nitrate to less harmful forms such as nitrogen containing gasses. This is known as the denitrification step of the nitrogen cycle and is achieved by nitrate reductase, an enzyme found in bacteria. The rate at which this process occurs is much slower than the rate at which humans use nitrate, therefore an excess of nitrate is often found in soils. Finding methods to reduce nitrate to less harmful forms of nitrogen is the focus of our lab's research. We use pyridinediimine(PDI)-metal complexes with transition metals to reduce nitrate. These metals have been chosen due to their redox potential and their relative cheapness. The PDI ligand can act as an electron reservoir allowing the complex to become highly reduced. Our lab as reported iron, zinc, and copper PDI complexes and have recently begun to expand to other metals transition metals, specifically cobalt and manganese. The manganese and cobalt PDI complexes have been synthesized and are characterized through spectroscopic techniques, utilizing nuclear magnetic resonance and infrared spectroscopy.