Manganese nitrosyls, coordination

Manganese nitrosyl porphyrins [215] are considered good models for the iron-nitric oxide analogs, which are relatively unstable but very vital to many biological operations. A six-coordinate manganese nitrosyl porphyrin of the form (por)Mn(NO)(L), where por can be TTP (TTP = tetra(4-methylphenyl)porphine) and L = piperidine, methanol, 1-methyhmidazole, has been prepared [216] in moderate yields by the reductive nitrosylation of the (por)MnCl complex with NO in piperidine. The crystal structures of these compounds give indication of a linear Mn-NO bond [215]. 

Ghosh K, Eroy-Reveles AA et al (2004) Reactions of NO with Mn (II) and Mn (III) centers coordinated to carboxamido nitrogen synthesis of a manganese nitrosyl with photolabile NO. Inorg Chem 43 2988-2997... 

---