کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1308747 | 975180 | 2009 | 7 صفحه PDF | دانلود رایگان |
The novel oxorhenium dichlorides mer-[ReO(L1)Cl2] (1) and fac-[ReO(L2)Cl2] (2) (L1 = 2-[2-(pyrazol-1-yl)ethyliminomethyl]phenolate; L2 = 2-[2-(pyrazol-1-yl)ethylaminomethyl]phenolate) were synthesized by reacting [NBu4][ReOCl4] with L1H and L2H, respectively. X-ray structural analysis of 1 and 2 has shown that L1 and L2 act as (N,N,O)-tridentate chelators coordinating to the Re(V) centre in a meridional and in a facial fashion, respectively. The reactivity of 2 towards potential bidentate/dianionic substrates is strongly dependent on the donor atom set, being observed that the presence of sulphur favours the displacement of the ancillary ligand (L2). By contrast, complex 2 reacted with (O,O)-bidentate substrates (1,2-ethanediol and oxalic acid) providing the mixed-ligand complexes fac-[ReO(L2)(OCH2CH2O)] (3) and fac-[ReO(L2)(C2O4)] (4). Complexes 3 and 4 are air and water-stable and have been characterized by the common spectroscopic techniques (IR, 1H and 13C NMR) and by X-ray diffraction analysis.
A novel pyrazolyl-containing Schiff base (L1H) and the corresponding secondary amine (L2H) were synthesized and used to prepare the oxodichlorides mer-[ReO(L1)Cl2] (1) and fac-[ReO(L2)Cl2] (2) (L1 = 2-[2-(pyrazol-1-yl)ethyliminomethyl]phenolate; L2 = 2-[2-(pyrazol-1-yl)ethylaminomethyl]phenolate). Reactions of 2 with (O,O)-bidentate substrates provided new “3+2” mixed-ligand Re(V) oxocomplexes, with retention of the facial coordination mode of the ancillary ligand (L2).Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 362, Issue 8, 1 June 2009, Pages 2807–2813