Synthesis of molybdenocene(IV) and tungstenocene(IV) tropolonato complexes: Its derivative containing calix[4]arene moiety |
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Authors: | Makoto Minato Jian-Guo Ren Koji Munakata |
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Affiliation: | a Department of Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan b Department of Chemistry, Shanxi University, Taiyuan 030006, China |
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Abstract: | The cationic di-μ-hydroxo dinuclear complexes of molybdenocene and tungstenocene [Cp2M(μ-OH)2MCp2]+ (Cp = η-C5H5; M = Mo or W) react with tropolone to afford corresponding tropolonato complexes [Cp2M(trop)]+ (trop = C7H5O2). The products were investigated by IR, 1H NMR, and 13C NMR spectroscopy as well as by X-ray crystallography (M = W). The structure shows that the central metal is surrounded by a distorted tetrahedral array of the two centers of cyclopentadienyl ligands and the two oxygen atoms of tropolonato ligand. The reaction has been extended to the synthesis of calix[4]arene receptor functionalized at the 1,3-positions of the upper rim with two tropolonato-molybdenocene centers. |
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Keywords: | Molybdenocene Tungstenocene Tropolone Calix[4]arene |
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