Reactions of the tridentate and tetradentate amine ligands di-(2-picolyl)( N-ethyl)amine and 2,5-bis-(2-pyridylmethyl)-2,5 diazohexane with technetium nitrosyl complexes

Abstract

The reaction of the Tc(II) nitrosyl complex (Bu 4N)[Tc(NO)Cl 4] with di-(2-picolyl)( NEt)amine in methanol yields the neutral complex [Tc(NO)Cl(py- N(Et)-py)]. The reaction of the Tc(I) nitrosyl complex [Tc(NO)Cl 2(HOMe)(PPh 3) 2] with this tridentate ligand yields cationic [Tc(NO)Cl(py- N(Et)-py)(PPh 3)]Cl. These two complexes have been structurally characterized. The reaction of [Tc(NO)Cl 2(HOMe)(PPh 3) 2] with the tetradentate ligand 1,4-bis-(2-pyridylmethyl)-1,4-diazobutane yields a mixture of products including cationic [Tc(NO)Cl(py-NH-NH-py)]Cl and cationic [Tc(NO)Cl(PPh 3)(py-NH-NH∼py)]Cl, with a pyridyl terminus left dangling.