57Fe-15N Spin-Spin Coupling at Natural Abundance of the Isotopes in Binuclear Complexes Fe2(CO)6(μ-RNS) Containing a Sulfimide Bridge

Complexes of the type Fe (CO) (μ-RNS) [R = H (la), Bu (lb), SiMe (lc), Si'BuMe (1d), SnMe (le)] have been studied by multinuclear magnetic resonance ( C, C, N, N, O, Si, Sn) with emphasis on natural abundance N NMR measurements. By application of various polarization transfer techniques J( Fe N) (6.1 Hz) in la has been determined for the first time, together with the isotope-induced shift S (-36 ppb). Compound ld has been prepared via the reaction between Me BuSiCl and Fe (CO) (μ-NaNS) (lf), available from la and sodium.