A trigonal prismatic Mn(II) complex, [MnL(H2O)]2+, with bis(picolinylidenehydrazyl)(2-pyridyl)methane (L). Synthesis, structure and properties

The complex, [MnL(H2O)]2+, has been isolated by the reaction of N,N′-bis(picolinylidene)hydrazine with N-(picolinylidene)hydrazine in presence of Mn2+. The pentadentate N5 donor ligand, bis(picolinylidenehydrazyl)(2-pyridyl)methane (L), is formed by the addition of N-(picolinylidene)hydrazine to one of the metal activated azomethine fragment of the tetradentate diazine ligand N,N′-bis(picolinylidene)hydrazine. The X-ray structure reveals the trigonal prismatic N5O coordination geometry around the high-spin metal centre in [MnL(H2O)]2+.