Fig. 9.

N₂O formation from the reactions of in situ generated (OEP)Fe(HNO)(5-MeIm) with external NO. (a) spectra of authentic samples of ¹⁴N₂O (solid line trace, 2237/2212 cm⁻¹), ¹⁵N₂O (broken line trace, 2167/2142 cm⁻¹), and ¹⁵N₂¹⁸O (dotted line trace, 2160/2138 cm⁻¹), (b) spectra of the headspace from the reactions of (solid line trace) (OEP)Fe(HNO)(5-MeIm) with ¹⁵N¹⁸O, and (broken line trace) (OEP)Fe(H¹⁵N¹⁸O)(5-MeIm) with NO; the newly formed mixed-isotope N₂O bands are highlighted. The solid line trace shows formation of ¹⁴N¹⁵N¹⁸O (2185/2162 cm⁻¹), while the broken line trace shows formation of ¹⁵N¹⁴N¹⁶O (2195/2169 cm⁻¹), (c) IR spectrum of the headspace from the reaction of (OEP)Fe(H¹⁵NO)(5-MeIm) with NO. The newly formed bands for the mixed-isotope ¹⁵N¹⁴N¹⁶O bands at 2195/2169 cm⁻¹ are highlighted. The singly labeled N₂O gases are also present in the headspace, and provide good internal reference spectra.