Molybdenum oxo and lmido complexes of ß-diketiminate ligands: Synthesis and structural aspects
Por:
Lyashenko G., Herbst-Irmer R., Jancik V., Pal A., Mösch-Zanetti N.C.
Publicada:
1 ene 2008
Resumen:
Treatment of [MoO2(?2-Pz)2] (Pz = 3,5-di-tert-butylpyrazolate) with the diketiminate ligand NacNacH (NacNac = CH[C(Me)NAr]2-, Ar = 2,6-Me2C6H 3) at 55°C leads under reduction of the metal to the formation of the dimeric molybdenum(V) compound [{MoO2(NacNac)}2] (1). The compound was characterized by spectroscopic means and by X-ray crystal structure analysis. The dimer consists of a [Mo2O4] 2+ core with a short Mo-Mo bond (2.5591-(5) Å) and one coordinated diketiminate ligand on each metal atom. The reaction of [MoO 2(?2-Pz)2] with NacNacH in benzene at room temperature leads to a mixture of 1 and the monomeric molybdenum(VI) compound [MoO2-(NacNac)(?2-Pz)] (2). From such solutions, yellow crystals of 2 suitable for X-ray structural analysis were obtained revealing the coordination of one bidentate NacNac and one ?2- coordinate Pz ligand. This renders the two oxo groups inequivalent. Further high oxidation state molybdenum compounds containing the NacNac ligand were obtained by the reaction of [Mo(NAr)2Cl2(dme)] (Ar = 2,6-Me 2C6H3) and [Mo(N-t-Bu)2Cl 2(dme)] (dme = dimethoxyethane) with 1 equiv of the potassium salt NacNacK forming [Mo(NAr)2Cl(NacNac)] (3) and [Mo(N-t-Bu) 2Cl(NacNac)] (4), respectively, in good yields. The X-ray structure analysis of 3 revealed a penta-coordinate compound where the geometry is best described as trigonal-bipyramidal. © 2008 American Chemical Society.
Filiaciones:
Lyashenko G.:
Institut für Chemie, Karl-Franzens-Universität Graz, Schubertstrasse 1, A-8010 Graz, Austria
Herbst-Irmer R.:
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
Jancik V.:
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior, 04510, México D.F., Mexico
Pal A.:
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
Mösch-Zanetti N.C.:
Institut für Chemie, Karl-Franzens-Universität Graz, Schubertstrasse 1, A-8010 Graz, Austria
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