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Updated: Jul 12, 2026

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Published on: April 28, 2023
Synthesis, characterization, and spectroscopy of model molybdopterin complexes
Sharon J Nieter Burgmayer1, Mary Kim, Rebecca Petit
1Department of Chemistry, Bryn Mawr College, Bryn Mawr, PA 19010, USA. sburgmay@brynmawr.edu
New molybdenum cofactor model complexes featuring pterin-substituted dithiolene chelates were synthesized and characterized. These novel compounds offer insights into molybdenum
Area of Science:
- Bioinorganic Chemistry
- Organometallic Chemistry
- Molybdenum Cofactor Research
Background:
- The molybdenum cofactor is crucial for various enzymatic reactions.
- Developing synthetic models aids in understanding molybdenum's biological roles.
- Previous models lacked specific pterin-dithiolene structural motifs.
Purpose of the Study:
- To synthesize and characterize novel molybdenum cofactor model complexes.
- To incorporate pterin-substituted dithiolene chelates into molybdenum complexes.
- To investigate the electronic properties and structural similarities to biological systems.
Main Methods:
- Synthesis of Mo(4+) and Mo(5+) oxo and sulfido complexes.
- Preparation of pterinyl alkynes and specific molybdenum reagents.
- Characterization using electrospray ionization mass spectrometry, electrochemistry, EPR, and MCD spectroscopy.
Main Results:
- Successful synthesis of Tp(*)MoX(pterin-R-dithiolene) complexes (X=O, S; R=aryl).
- Cyclic voltammetry showed intermediate Mo(5+/4+) reduction potentials.
- EPR and MCD data indicated electronic similarity to known molybdenum environments.
Conclusions:
- The new pterin-dithiolene model complexes effectively mimic aspects of the molybdenum cofactor.
- The electronic properties are tunable based on dithiolene substituents.
- These models provide valuable tools for studying molybdenum-dependent enzymes.
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