A researcher at Oxford University has succeeded in stabilizing nitrogen chains that had previously been considered capable of existing only under extreme conditions.
For several decades, the instability of these molecules made them extremely difficult to investigate, but a method has now been found to stabilize them.
The discovery was made by a team of chemists led by Professor Meera Mehta from Oxford’s Department of Chemistry.
Nitrogen typically forms diatomic molecules, and previous efforts to connect additional nitrogen atoms into longer chain structures consistently ended in failure.
These attempts collapsed because the structures would convert into nitrogen gas.
The research group developed a molecule containing four nitrogen atoms arranged linearly, along with an additional electron that provides stabilization.
This configuration allows the structure to remain in solid form for weeks instead of decomposing instantly.
Because the material remains stable in its solid state for extended periods, the team could thoroughly analyze its structure and properties—a capability that had never existed for this category of molecules.
Converting these molecules into solid crystals enabled detailed examination of the chains.
The shared electrons throughout the chain contribute to maintaining stability despite nitrogen’s natural tendency toward instability.
This advancement may mark the beginning of a new phase for nitrogen-based materials with potential for sophisticated uses.
Nitrogen chains contain substantial energy and could be utilized in future applications like advanced propellants or rocket fuel.
Additionally, nitrogen presents a non-toxic energy storage alternative that produces no carbon emissions.
These molecules exhibit high reactivity and energy content, with the capacity to transfer nitrogen atoms to other compounds.
They might also function as nitrene radical sources, potentially simplifying and improving the precision of complex molecule synthesis for researchers.
By overcoming the natural instability that previously rendered these nitrogen chains so challenging to examine, new research opportunities have emerged.
These chains had previously been theorized to exist only in extreme settings such as lightning strikes or in outer space.
Because these chains can now be produced and studied in standard laboratory conditions, researchers have greater freedom to explore their potential applications.
This groundbreaking research, conducted under Professor Meera Mehta’s direction, has not only challenged long-standing assumptions but has also substantially deepened our understanding of nitrogen chemistry.
Post-doctoral research associates, doctoral candidates, and master’s students from the chemistry departments at both the University of Manchester and the University of Oxford participated in this research.