Editing Nitrene (section)

==Nitreno radicals==
For several compounds containing both a nitrene group and a [[free radical]] group an ESR high-spin quartet has been recorded (matrix, cryogenic temperatures). One of these has an [[amine oxide]] radical group incorporated,<ref>{{cite journal|title=Heterospin organic molecules: nitrene–radical linkages |journal=[[Polyhedron (journal)|Polyhedron]] |volume=20 |issue=11–14 |date=30 May 2001 |pages=1647–1652 |first1=Paul M. |last1=Lahti |first2=Burak |last2=Esat |first3=Yi |last3=Liao |first4=Paul |last4=Serwinski |first5=Jiang |last5=Lan |first6=Richard |last6=Walton |doi=10.1016/S0277-5387(01)00667-2}}</ref> another system has a carbon radical group.<ref>{{cite journal|title=2,3,5,6-Tetrafluorophenylnitren-4-yl: Electron Paramagnetic Resonance Spectroscopic Characterization of a Quartet-Ground-State Nitreno Radical |first1=Wolfram |last1=Sander |first2=Dirk |last2=Grote |first3=Simone |last3=Kossmann |first4=Frank |last4=Neese |journal=[[J. Am. Chem. Soc.]] |date=2008 |volume=130 |issue=13 |pages=4396–4403 |doi=10.1021/ja078171s|pmid=18327939 }}</ref>

:[[File:NitreneTriRadical.svg|Nitrene radical]]

In this system one of the nitrogen unpaired electrons is delocalized in the aromatic ring making the compound a σ–σ–π triradical. A [[carbene]] nitrogen radical (imidyl radical) [[resonance structure]] makes a contribution to the total electronic picture.