Nitric oxide reactivity of a manganese(II) complex leading to nitrosation of the ligand (original) (raw)

Manganese(II) complexes, [Mn(L)(Cl) 2 ], 1 and [Mn(L)(H 2 O) 2 ](ClO 4) 2 , 2 {L = N 1 ,N 2-bis((pyridine-2yl)methyl)ethane-1,2-diamine} were prepared and characterized. In acetonitrile solution, complex 1 did not react with nitric oxide gas. However, addition of nitric oxide gas to the acetonitrile solution of complex 2 resulted in unstable Mn(II)-nitrosyl intermediate. The formation of nitrosyl intermediate was evidenced by UV-Vis, solution FT-IR, 1 H NMR spectral studies. Subsequently, Mn(II) center in the complex 2 was undergone reduction to Mn(I) with a simultaneous N-nitrosation of the ligand. The N-nitrosated ligand was isolated and characterized. It should be noted that the corresponding Cu(II) complex of the same ligand in presence of nitric oxide was not found to yield Cu(II)-nitrosyl.