Incorporation of stable organic radicals into cyclotriphosphazene: Preparation and characterization of mono- and diradical adducts

[GRAPHICS] Stable cyclotriphosphazenes 4 and 5, incorporating one and two carbon radic al centers, respectively, have been easily prepared and characterized. EPR spectroscopic studies in fluid solution at room temperature were carried ou t for both compounds and also for diradical 5 in frozen solvent matrixes. S pectral results are consistent with a triplet or degenerate singlet triplet ground state for 5. Reductive cyclic voltammetry shows a redox couple, bei ng monoelectronic for 4 and bielectronic for 5.