SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF OXORHENIUM(V) COMPLEXES WITH LIGANDS OF THE PYRIDYLAMINOPHENOL TYPE CONTAINING THE ONN DONOR ATOM SET

Abstract

Abstract Monooxo complexes of rhenium(V) with 2-[[[(2-pyridinyl)ethyl]amino]methyl]phenol (HL2) and some of its derivatives, containing the ONN donor-atom set, have been synthesized. The complexes with general formula [ReOCl2(Ln)] were characterized by various physical techniques, including IR and NMR. X-ray structures of [ReOCl2(Ln)] (n = 2,3,5; HL3 = 2-[[[2-(dimethylamino)ethyl]amino]methyl]phenol; HL5 = 2-[[(2-pyr-idinylmethyl)ethylamino]methyl]phenol) were determined. Crystals of [ReOCl2(L2)] (2) are rhombohedral, R3, a = 13.915(2)Å, α = 81.76(2)°, Z = 6; those of [ReOCl2(L3)] (3) are monociinic, C2/c, a = 25.92(2), b = 9.426(8), c = 28.38(2)Å, β = 100.33(9)°, Z = 16. [ReOCl2(L5)], (5), is monociinic, P21, a = 7.380(4), b = 11.743(7), c = 8.346(5)Å, β = 94.74(5)°, Z = 2. The structures were solved by the Patterson method and refined by full-matrix least-squares to R = 0.038, 0.036 and 0.062 for complexes 2, 3 and 5, respectively. In all three complexes the multidentate Ln − ligands act as terdentate ONN-donors, with the phenolate oxygen occupying the site trans to the oxo oxygen.