תקציר
Planar Nx systems such as cyclo-N5- and N5+ tend to be more stable than nonplanar systems such as the neutral cyclo-N6. It is proposed that the key to stabilization is the separation of the σ and π electron systems. In both cyclo-N 5- and N5+, a six-π-electron system is created upon either adding to or removing from the cyclo-N5 radical one electron. Judicious addition of oxygen atoms to polynitrogen ring compounds such as cyclo-N4 and cyclo-N6 can increase their thermodynamic and kinetic stabilities, accompanied by only a small reduction in their efficiency as high energy density materials (HEDMs). The properties of some of these compounds are calculated and compared with the parent all-nitrogen compounds. Coordination of one or more oxygen atoms to the ring leads to effective separation of the σ and π electron systems helping to stabilize the systems. Natural bond analysis indicates that the exocyclic NO bonds can assume a single or double bond character, depending on the ring system.
שפה מקורית | אנגלית |
---|---|
עמודים (מ-עד) | 7376-7382 |
מספר עמודים | 7 |
כתב עת | Journal of Physical Chemistry A |
כרך | 113 |
מספר גיליון | 26 |
מזהי עצם דיגיטלי (DOIs) | |
סטטוס פרסום | פורסם - 2 יולי 2009 |
פורסם באופן חיצוני | כן |