Two decavanadates (trisH)4[H2V10O28]·10H2O (1) and (trisH)6[V10O28] (2) have been synthesised from NaVO3 or V2O5 in an aqueous solution of tris(hydroxymethyl)aminomethane (tris). Bimetallic derivatives [Cu(OH2)5(trisH)]2[V10O28]·6H2O (3) and [Cu(OH2)3(2–amp)]2(trisH)2 [V10O28]·2H2O (4) were obtained by the addition of CuCl2 or CuCl2 / 2–amp (2–(aminomethyl)pyridine) to the route that gave 2. The products were characterised by single-crystal X-ray diffractometry, thermogravimetric analysis, FTIR, Raman and EPR spectroscopies. Moreover, 4 was effective in bleaching a methylene blue (MB) solution under natural light in acidic media by either degradation of the dye or precipitation of a MB-decavanadate salt depending on the experimental conditions.
- COPPER(II) COMPLEXES
- Methylene blue