Dioxobenzene dianions - unusual ligands in methylnickel compounds
| Autor: | Thomas Wiemer, Michèle Dartiguenave, Marie-J. Menu, Hans-F. Klein, Yves Dartiguenave |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Trigonal planar molecular geometry
Stereochemistry Trimethylphosphine Ionic bonding chemistry.chemical_element Crystal structure Triclinic crystal system Inorganic Chemistry chemistry.chemical_compound Nickel Crystallography chemistry X-ray crystallography Materials Chemistry Molecule Physical and Theoretical Chemistry |
| Zdroj: | Inorganica Chimica Acta. 193:120 |
| ISSN: | 0020-1693 |
| Popis: | Novel square planar methylnickel compounds with benzene-dioxo ligands (OO)[NiMe(PMe3)]2 (O Obenzene-1,2-dioxo (1); benzene-1,2-dioxo-4-methyl (2); benzene-1,2-dioxo-3-methoxo (3)) were prepared from [NiMe(OMe)(PMe3)]2 and the corresponding 1,2-dihydroxobenzene. In the presence of trimethylphosphine dinuclear complexes (OO)Ni2Me2(PMe3)3, 1a-3a, and 4 (OOnaphthaline- 2,3-dioxo) were obtained, while (−I) substituents gave rise to the formation of ligand-rich ionic species [NiMe(PMe3)4]+[(OO)NiMe(PMe3)]− (OO)benzene-1,2-dioxo-4-nitro (5); benzene-1,2-dioxo-3- formyl (6); benzene-1,2-dioxo-4-formyl (7). All three types of compounds were unexpected. Compound 3a crystallizes in the triclinic space group P 1 with a=8.784(4), b=9.095(2), c=16.796(4) A, α=96.83(2), β=101.99(3), γ=102.85(3)°, V=1260.5(2) A3, Z=2. Final discrepancy indices are R=0.0398 and Rw=0.0439. The molecule 3a contains two square planar nickel centres with their coordination planes at right angles. The point of connection is provided by a trigonal planar oxygen atom (Ni1O1=1.919(5), Ni2O1=1.966(4), O1C3(sp2)=1.356(6) A). In a similar synthesis resorcinols gave dinuclear complexes (OO)[NiMe(PMe3)2]2 (OObenzene-1,3-dioxo (8a); benzene-1,3-dioxo-5-methoxo (9a); benzene- 1,3-dioxo-2-nitro (10a) as expected for two phenolic functions. |
| Databáze: | OpenAIRE |
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