Synthese,Struktur und Reaktivität von Tris‐, Bis‐ und Mono(2,4‐dimethylpentadienyl)‐Komplexen des Neodyms,Lanthans und des Yttriums |
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Authors: | Michael R Kunze Dirk Steinborn Kurt Merzweiler Christoph Wagner Joachim Sieler Rudolf Taube Prof Dr |
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Institution: | 1. Halle (Saale), Institut für Anorganische Chemie der Martin Luther Universit?t;2. Leipzig, Institut für Anorganische Chemie der Universit?t Leipzig;3. Halle (Saale), Institut für Anorganische Chemie der Martin Luther Universit?tFuchsienweg 17, D‐06118 Halle (Saale), Telefax: (+)49 0345 5230858 |
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Abstract: | The tris(2,4‐dimethylpentadienyl) complexes Ln(η5‐Me2C5H5)3] (Ln = Nd, La, Y) are obtained analytically pure by reaction of the tribromides LnBr3·nTHF with the potassium compound K(Me2C5H5)(thf)n in THF in good yields. The structural characterization is carried out by X‐ray crystal structure analysis and NMR‐spectroscopically. The tris complexes can be transformed into the dimeric bis(2,4‐dimethylpentadienyl) complexes Ln2(η5‐Me2C5H5)4X2] (Ln, X: Nd, Cl, Br, I; La, Br, I; Y, Br) by reaction with the trihalides THF solvates in the molar ratio 2:1 in toluene. Structure and bonding conditions are determined for selected compounds by X‐ray crystal structure analysis and NMR‐spectroscopically in general. The dimer‐monomer equilibrium existing in solution was investigated NMR‐spectroscopically in dependence of the donor strength of the solvent and could be established also by preparation of the corresponding monomer neutral ligand complexes Ln(η5‐Me2C5H5)2X(L)] (Ln, X, L: Nd, Br, py; La, Cl, thf; Br, py; Y, Br, thf). Finally the possibilities for preparation of mono(2,4‐dimethylpentadienyl)lanthanoid(III)‐dibromid complexes are shown and the hexameric structure of the lanthanum complex La6(η5‐Me2C5H5)6Br12(thf)4] is proved by X‐ray crystal structure analysis. |
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Keywords: | Neodymium Lanthanum Yttrium η 5‐2 4‐Dimethylpentadienyl complexes Crystal structure NMR spectroscopy |
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