The dinitrosyliron complex [Fe4(μ3-S)2(μ2-NO)2(NO)6]2- containing bridging nitroxyls: 15N (NO) NMR analysis of the bridging and terminal NO-coordinate ligands

The fluxional terminal and semibridging NO-coordinate ligands of DNIC [Fe-4(mu(3)-S)(2)(mu(2)-NO)(2)(NO)(6)](2-), a precursor of Roussin's black salt (RBS), are characterized by IR nu(NO), N-15 (NO) NMR and single-crystal X-ray diffraction.