Abstract
The reactions of trans-[ReOX3(PPh3)2] (X = Cl, Br) with 4-aminoantipyrine (H2pap) were studied, and the complexes cis-[ReX2(pap)(H2pap)(PPh3)](ReO4) (X = Cl (1), Br (2)) were isolated. The crystal structure of 2 was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P21 with a = 11.5145(6) A, b = 11.5330(5) A, c = 17.5492(9) A, β = 105.322(2)°, V = 2247.6(2) A3, Z = 2, C40H39N6O6PBr2Re2, M r = 1262.97, D c = 1.866 g cm−3, F(000) = 1208 and μ(Mo K α) = 7.244 mm−1, the final R = 0.0545 and wR = 0.1314. The ligand pap is coordinated through the doubly deprotonated amino nitrogen as an imide, and H2pap acts as a neutral bidentate chelate, with coordination through the neutral amino nitrogen and the ketonic oxygen. The synthesis and crystal structure of the complex cis-[ReBr2(pap)(H2pap)(PPh3)](ReO4), prepared from the reaction of trans-[ReOBr3(PPh3)2] with 4-aminoantipyrine (H2pap), is described.
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