Reactivity of the iron porphyrin Fe(TPP)(NO) with excess NO.: Formation of Fe(TPP)(NO)(NO2) occurs via reaction with trace NO2

Fe(TPP)(NO) (TPP = tetraphenylporphyrinato dianion) does not react observably with excess NO in organic solvents at ambient pressure and temperature; however, adventitious NO2 rapidly leads to the nitrosyl nitro product Fe(TPP)(NO)(NO2), which is labile toward loss of Nd. [GRAPHICS]