Low temperature NO disproportionation by Mn porphyrin. Spectroscopic characterization of the unstable nitrosyl nitrito complex MnIII(TPP)(NO)(ONO)

Reaction of NO gas with sublimed layers of the MnIITPP (TPP = meso-tetraphenylporphyrinato2−) at low temperature leads to nitric oxide disproportionation. UV-Vis and FTIR spectroscopy with isotopically substituted nitrogen oxides revealed formation of the unstable species identified as trans-MnIII(TPP)(NO)(ONO).