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(DPA), 1,2-bis(2-pyridyl)ethylene (DPE) and di-(2-picolyl)amine (HDIPA). Reactions of a twfold molar excess of the otentially NN donor ligand DPA with trans-[ReO(OEt)C12(PPh3)2] in ethanol led to isolation of a monomer [ReOCl2(OEt)(DPA)] (1). Treatments of traps-[ReOCl3(PPh3)2] with a tenfold molar excess of PA in ethanol at reflux yielded [ReO2(dpa)2]Cl (2), but with a twofold molar excess a dimer (u-O)[{ReOCl2(dpa)}2] (3a) was isolated. The latter reaction with (n-Bu4N)[ReOCl4] as starting material in ethanol at room temperature led to a dark green product, also with the formulation (ƒÊ-O)[{ReOCl2(dpa)}2] (3b). Reacting equimolar quantities of (nBu4N)[ReOCl4] and HDIPA in acetone led to [ReOCI(0H2)(DIPA)]Cl (4) in which HDIPA acted as a monoanionic terdentate chelate. The reaction of trans-[ReOCl3(PPh3)2] with DPE, in which DPE undergoes a metal-promoted nucleophilic attack by a water molecule, produces a complex with a general formula [ReO(DPE.OH)Cl2] (5) .

Multidentate Dipyridyl Derivatives as Chelates for Rhenium (V)