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Metal nitrosyls are Complexes that contain Transition Metal s bonded to Nitric Oxide , N O .Hayton, T. W.; Legzdins, P.; Sharp, W. B. "Coordination and Organometallic Chemistry of Metal-NO Complexes" Chemical Reviews 2002, volume 102, pages 935-991; Richter-Addo, G. B.; Legzdins, P. Metal Nitrosyls; Oxford University Press: New York, 1992 Metal nitrosyls are important biologically. This large class of molecules continues to be of interest to researchers and technologists. 18-ELECTRON RULE PERSPECTIVE In the language of the 18-electron Rule , NO is a three-electron Ligand when the M-N-O angle is close to 180°. This bonding mode, "linear nitrosyl", is common. In some nitrosyl complexes, the M-N-O angle deviates strongly from linearity, approaching often 130°. Such bent species are related to classical organic and main group nitrosyl compounds, e.g. Nitrosobenzene and Nitrosyl Chloride . In "bent NO" complexes, NO is considered to be a one-electron, Pseudohalide -like ligand. Because of the two different bonding modes, metal nitrosyls are considered to be a thorny topic for those studying structural inorganic chemistry. Most transition metal nitrosyls are linear, most main group nitrosyls are bent. EXAMPLES Two of the earliest nitrosyl complexes are "Roussin's Red Salt" and "Roussin's Black Salt". The Red Salt has the formula Na2[Fe2(NO)4S2]. The anion, [Fe2(NO)4S2]2−, can be viewed as an edge-shared bi Tetrahedron . Each Fe is bonded to two "linear" NO ligands and shares a pair of sulfido ligands with the other iron. The Black Salt is a more complex Cluster with the formula Na[Fe4(NO)7S3]. The anion in this species has C3v Point Group Symmetry . The Fe4S3 core is that of an incomplete Cubane . The parent cubane is (FeNO)4S4. |
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