Hexacoordinate oxy-globin models Fe(Por)(NH3)(O2) react with NO to form only the nitrato analogs Fe(Por)(NH3)(η1-ONO2), even at ∼100 K

Abstract

The oxy-globin models Fe(Por)(NH(3))(O(2)), prepared by sequential reactions of O(2) ((18)O(2)) and NH(3) with thin porous layers of Fe(II)(Por), react with NO ((15)NO) at 80-100 K to form only the low-spin nitrato complexes Fe(Por)(NH(3))(η(1)-ONO(2)), thus implying that peroxynitrite intermediates, if formed, must undergo very facile isomerization to the nitrato analog.