A new organodiazenido rhenium complex, [ReCl2(N2COPh)(C4N2H4)(PPh3)(2)] has been obtained from the direct reaction of [ReCl2(eta(2)-N2COPh-N',O)(PPh3)(2)] with pyrazine in acetone. The complex has been characterized by spectroscopic methods and its structure determined using single-crystal X-ray diffraction techniques.