Synthesis and characterisation of new binuclear oxo-vanadium(IV) complexes with a bis(bidentate)oxalate bridge. Crystal structures of the cationic and anionic complexes [V2O2(C2O4)(H2O)6]Cl2·4Bu4NCl·H2O and [FeCp*2]2[Et4N]2[V2O2(C2O4)(NCS)6]
| Autor: | Jean Sala Pala, F. Bérézovsky, Smail Triki, M. T. Garland |
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| Rok vydání: | 2000 |
| Předmět: |
Denticity
010405 organic chemistry Ligand Trans effect Vanadium chemistry.chemical_element Crystal structure 010402 general chemistry Metathesis 01 natural sciences Oxalate 0104 chemical sciences 3. Good health Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry Materials Chemistry Physical and Theoretical Chemistry Monoclinic crystal system |
| Zdroj: | Inorganica Chimica Acta. 308:31-36 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/s0020-1693(00)00192-4 |
| Popis: | The new oxalate–vanadyl compounds [V2O2(C2O4)(H2O)6]Cl2·4Bu4NCl·H2O (1) (Bu=C4H9) and [Et4N]4[V2O2(C2O4)(NCS)6] (2′) (Et=C2H5) have been synthesized starting from V2O5 and VOSO4·5H2O, respectively. Metathesis of 2′ with [FeCp*2]BF4 (Cp*=C5(CH3)5) gave a partial substitution of the cations affording [FeCp*2]2[Et4N]2[V2O2(C2O4)(NCS)6] (2). The X-ray structures of 1 and 2 have been determined. In both complexes, which crystallise in the monoclinic space group P21/c, the centrosymmetric binuclear vanadium species present a bis(bidentate)oxalate ligand and an almost planar [V2O2(C2O4)X2] unit (X=O(H2O) for 1 and N(NCS) for 2) with two VO groups located in trans positions in the equatorial plane. In both cases, the strong VO terminal bond (1.569(7) in 1, 1.580(7) A in 2) has a strong trans influence which is slightly greater in the cation of 1 than in the anion of 2. Magnetic susceptibility measurements indicate weak antiferromagnetic pairwise interactions for 1, 2 and 2′. |
| Databáze: | OpenAIRE |
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