Abstract

The reaction of rhenium(V) chloride with 1 : 1 mole proportions of tetraethyl- or tetra-n-propyl-ammonium chlorides in dichloromethane under anhydrous, oxygen-free conditions, affords the rhenium(IV) species of stoicheiometry [R4N]ReCl5 which contain the polymeric octahedral [ReCl5–]n anion. The air-stable salts react with a variety of monodentate donor molecules (e.g. acetonitrile and pyridine) and with pyrazine (pz) to produce the pseudooctahedral anions [ReCl5,L]–. The pyrazine-bridged complex ([Et4N]ReCl5)2,pz has also been prepared.

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