One-dimensional coordination polymers made of transition metal–nitronyl nitroxide radical with dicyanoaurate(I) bridges

Three 1-D transition metal–nitronyl nitroxide radical complexes with dicyanoaurate(I) bridges, [M(NIT3py)2][Au(CN)2]2 [NIT3py = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, M = Mn, Co, Zn (1–3)], were synthesized and structurally characterized. Three compounds are all isostructural in monoclinic, C2/c space group with Z = 4. The [Au(CN)2]− anions link [M(NIT3py)2] units via μ2-bridging mode, leading to a linear coordination chain. The M(II) ion adopts a distorted octahedral geometry with four N atoms from [Au(CN)2]− groups and two pyridyl-N atoms from NIT3py ligands. The magnetic behavior shows that the couplings are both weak antiferromagnetic between Mn(II) and NIT3py and between Co(II) and NIT3py.