N-Picolyl-N'-benzoylthiourea,H2picbtu-A new ligand with a remarkable coordination mode.Synthesis and structures of H2picbtu and its tetrameric oxorhenium(V)complex

摘要

(NBu4)[ReOCl4]reacts with N-picolyl-N'-benzoylthiourea(H2picbtu)in acetone under formation of the deep-green oxorhenium(V)complex(NBu4)2[{Re2O2Cl5(Hpicbtu)}2O],which was studied by X-ray diffraction.Two dimeric units with each one bridging,singly deprotonated thiourea ligand are connected by an oxo ligand.Inside the subunits,Hpicbtu~-coordinates as S,O chelate with a six-membered chelate ring to one rhenium atom,while a five-membered chelate ring is established with the second Re atom and the nitrogen atoms of the picolylamine building block.The compound represents one of the very rare examples of anionic mu-oxorhenium(V)complexes.