The reactivity of the [Re≡O]3+ core toward aromatic 1,2-diamines: the formation of rhenium(V)-imido complexes
摘要:
The reaction of the aromatic diamines 1,2-diaminobenzene, 2,3-diaminophenol (H2L), 2,3-diaminotoluene and 3,4-diaminobenzophenone (H2N-R-NH2) with trans-ReOCl3(PPh3)(2) in an equimolar ratio in ethanol gave the products trans-[Re(N-R-NH2)Cl-3(PPh3)(2)] in good yield. IR, H-1 NMR and X-ray crystallographic results indicate that the diamine ligands coordinate to rhenium(V) in a dianionic monodentate imido form. The structure of trans-[Re(L)Cl-3(PPh3)(2)] was determined and shows that only the deprotonated amino nitrogen in the 2-position of the potentially ambidentate 2,3-diaminophenol molecule is coordinated to the metal. (C) 1998 Elsevier Science S.A. All rights reserved.