Synthesis, X-ray crystal structure and thermal decomposition of two peroxovanadium complexes with coordinated ammonia molecules: [{VO(O-2)2(NH3)}(2){[mu-Cu(NH3)(4)}] and [Zn(NH3)(4)][VO(O-2)(2)(NH3)](2)
| Authors | |
|---|---|
| Year of publication | 2008 |
| Type | Article in Periodical |
| Magazine / Source | Polyhedron |
| MU Faculty or unit | |
| Citation | |
| Field | Inorganic chemistry |
| Keywords | peroxovanadium complexes; ammine complexes; X-ray structure; IR spectra; thermal decomposition |
| Description | The compounds [{VO(O-2)(2)(NH3)}(2){mu-Cu(NH3)(4)}] (1) and [Zn(NH3)(4)][VO(O-2)(2)(NH3)](2) (2) were prepared and characterized by elemental analysis and infrared spectra. The single crystal X-ray study revealed that the structure of 1 consists of trinuclear complex molecules [(NH3)OV(O-2)(2){mu-Cu(NH3)(4)}(O-2)(2)VO(NH3)] with a rare heterobimetalic peroxo bridge: copper(II)-peroxo ligand-vanadium(V). The structure of 2 is composed of tetraamminezinc(II) cations and ammineoxodiperoxovanadate(V) anions. In course of thermal decomposition of 1 performed up to 620 degrees C, the following intermediate products: [Cu(NH3)(2)(VO3)(2)], and subsequently a mixture of V2O5 with monoclinic beta-Cu2V2O7, were gradually formed. The final product of decomposition is Cu(Vo(3))(2). The thermal decomposition of 2 is a two-step process. In the first stage, [Zn(NH3)3(VO3)2] as supposed intermediate was formed, which transformed at higher temperatures by release of ammonia molecules to the monoclinic modification of Zn(VO3)(2). |
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