Synthesis and characterisation of some novel hetero-diradicals containing linked hydrazyl and aminoxyl (nitroxide) moieties

We report the synthesis and characterisation of some novel hydrazine-derive d monoradicals incorporating nitroxide 14, nitronyl-nitroxide dagger 15 and imino-nitroxide 16 functions, as well as the corresponding diradicals assi gned the hydrazyl-nitroxide 17, hydrazyl-nitronyl-nitroxide 18 and hydrazyl -imino-nitroxide 19 structures. EPR, UV-Vis and electrochemical (CV) charac teristics are reported, along with MS and NMR data where appropriate; pK(a) and BDE values are calculated as well as the average interelectronic separ ation in the triplet diradicals 18 and 19 obtained via solid-state EPR meas urement and calculations. The reactions of these compounds with short-lived radicals generated by photolysis, as well with NO and NO2, are also report ed.