کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1408077 | 1501904 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and structural characterization of new tungsten(VI) complexes with polycarboxylate ligands Synthesis and structural characterization of new tungsten(VI) complexes with polycarboxylate ligands](/preview/png/1408077.png)
The reactions of (NH4)2WS4 and three polycarboxylate ligands (including nitrilotriacetate (nta3−), citrate (Hcit3−) and ethylenediaminetetraacetate (EDTA4−)) in H2O/EtOH at ambient temperature have resulted in three new trioxotungsten (VI) complexes, K3[WO3(nta)]·H2O 1, (NH4)4[WO3(cit)]·2 H2O 2 and K2(NH4)2[W2O6(EDTA)]·4H2O 3, respectively. These three complexes have been characterized by IR, XPS, TGA–DTA, 1H and 13C NMR spectroscopy. And their structures have been determined by X-ray crystallographic studies, which confirm that 1 and 2 are mononuclear compounds and 3 is a binuclear compound. Each tungsten atom in 1–3 is coordinated to three unshared oxygen atoms, which adopt fac stereochemistry, while the remaining fac positions are occupied by three atoms from the ligands. The electrochemical properties of 2 and 3 have been investigated.
Journal: Journal of Molecular Structure - Volume 832, Issues 1–3, 30 April 2007, Pages 138–145