It has been shown that photolysis of 4-azidopyridine N-oxide yields the singlet
nitrene, which undergoes intersystem crossing at room temperature to generate triplet 4-
nitrenopyridine N-oxide. The room temperature photochemistry is dominated by triplet
nitrene chemistry leading to the formation of the azo-dimer. This unusual behavior is a
result of selective stabilization of the lowest singlet state of the nitrene by the N-oxide
group.
In this study, we wish to investigate the effect of complexation of the N-oxide
group with a metal cation on the kinetics and reactivity of 4-nitrenopyridine N-oxide and
related compounds. It is envisaged that complexation will alter the polarity of the N-oxide
bond making it less capable of spin delocalization in the nitrene.
Complexation may be achieved through two different methods: complexation
with cations in aqueous salt solutions and complexation of cations inside crown ethers.
Crown ethers provide useful models due to the selectivity of complexation with different
ions based on ring size and slower diffusion of cations away from the N-oxide group.
Progress toward the multi-step synthesis of crown ethers containing the 4-
azidopyridine N-oxide substructure is described herein. / Department of Chemistry
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:123456789/194985 |
| Date | 16 August 2011 |
| Creators | Williams, Megan E. |
| Contributors | Poole, James S. |
| Source Sets | Ball State University |
| Detected Language | English |
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