Complexes of Oxorhenium(V) with Aromatic 2-Amino-Alcohols

Monooxo complexes of rhenium(V) with 2-aminophenol and some of its derivatives (H2nod), containing the N,O donor-atom set, have been synthesized. Square-pyramidal complexes [ReO(nod)2]− were isolated by reaction with (n-Bu4N) [ReOCl4] in ethanol. In benzene the neutral species [ReOCL(Hnod)2] were obtained. In the presence of hydrochloric acid in ethanol, the anionic complexes (n-Bu4N) [ReOCl3(Hnod)] were produced. Trans-[ReOCl3(PPh3)2] was also reacted with some of the H2nod ligands to yield [ReOCL2(Hnod)(PPh3]. The crystal structure of [ReOCl2(Hmap)(PPh3)] (H2map = 2-aminobenzylalcohol) was determined; crystals are monoclinic, P21/n, with a = 15.065(6), b = 11.253(7), c = 15.850(7) A, β = 94.27(4)°, U = 2680(2) A and Z = 4. The structure was solved by the Patterson method and refined by full-matrix least-squares techniques to R = 0.042. The monoanionic Hmap− ligand is coordinated as a bidentate through a neutral amino nitrogen and an anionic alcoholate oxygen atom, with the latter trans to the ...