Preparation and properties of dinitrogen complexes of molybdenum and tungsten with trimethylphosphine as coligand : III. Synthesis and properties of cis-[W(N2)2(PMe3)4], trans-[W(C2H4)2(PMe3)4] and [M(N2)(PMe3)5] (M = Mo,W). The crystal and molecular structure of [Mo(N2)(PMe3)5] |
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| Authors: | Ernesto Carmona Jose M Marin Manuel L Poveda Robin D Rogers Jerry L Atwood |
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| Institution: | Departamento de Quimica Inorganica, Facultad de Quimica, Universidad de Sevilla, Sevilla Spain;Department of Chemistry, The University of Alabama, University, Alabama 35486 U.S.A. |
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| Abstract: | The reduction of WCl4(PMe3)3] with dispersed sodium, under dinitrogen, gives cis-W(N2)2(PMe3)4], while under ethylene trans-W(C2H4)2(PMe3)4] is obtained. The ethylene complex can also be prepared by displacement of the dinitrogen molecules in cis-W(N2)2(PMe3)4] by ethylene at room temperature and pressure. Interaction of cis-M(N2)2(PMe3)4] complexes (M = Mo, W), with PMe3, under helium or argon, yields M(N2)(PMe3)5]. The molybdenum complex crystallizes in the orthorhombic space group Pnma, with a 22.063(6), b 12.106(4), c 9.745(4) Å. The Mo—P distance trans to the dinitrogen ligand (2.483(7) Å) is slightly longer than the average of the other four Mo—P bonds (2.460(5) Å). |
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