A picolinate-N2 complex of rhenium, the first dinitrogen complex bearing a carboxylate or a N,O-ligand

A new dinitrogen rhenium(I) complex with a picolinate ligand has been prepared and fully characterized, providing the first example of a genuine N N complex bearing a carboxylate or a N,O-coligand. The Lever electrochemical E-L ligand parameter was estimated for the first time for the picolinate ligand and shows that its carboxylate arm has a net electron-donor character similar to that of chloride, thus stabilizing the trans Re-N-2 bond. (c) 2006 Elsevier B.V. All rights reserved.