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首页> 外文期刊>Chemistry: A European journal >A New Synthesis of Charge-Neutral Tris-Pyrazolyl and -Methimazolyl Borate Ligands
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A New Synthesis of Charge-Neutral Tris-Pyrazolyl and -Methimazolyl Borate Ligands

机译：电荷中性的Tris-吡唑基和-Methimazolyl硼酸酯配体的新合成

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摘要

The dimethylamine in the adducts [(HNMe2)B(azolyl)(3)] (azolyl = methimazolyl, pyrazolyl), obtained by reaction of the azole with B(NMe2)(3), can readily be Substituted with a range of nitrogen donors to provide new charge-neutral, tripodal ligands in high yield. This observation has led to a revision of an earlier interpretation of the mechanism of the formation of these species. The donor properties of the ligands [(nmi)B(azolyl)(3)] (nmi = N-methylimidazole) have been compared with their anionic analogues [HB-(azolyl)(3)](-) by synthesis of their manganese(I)-tricarbonyl complexes and comparison of their infrared v(CO) energies. This comparison indicates that the new neutral ligands are only marginally weaker donors than the corresponding anionic hydrotris(azolyl)borate ligands. This may be explained by the ability of the attached nmi ring to stabilize a positive charge remotely from the coordinated metal, which may also account for the fact that the [(nmi)B(pyrazolyl),] ligand is a substantially stronger donor than the similarly neutral tris(pyrazolyl)methane ligand.
机译：通过将吡咯与B（NMe2）（3）反应获得的加合物[（HNMe2）B（偶氮基）（3）]（偶氮基=甲him基，吡唑基）中的二甲胺可以很容易地用一系列氮供体取代提供高产量的新型电荷中性三脚架配体。这种观察导致对这些物种形成机理的早期解释的修订。配位体[（nmi）B（偶氮基）（3）]（nmi = N-甲基咪唑）的供体性质已通过其锰的合成与它们的阴离子类似物[HB-（偶氮基）（3）]（-）进行了比较。 （I）-三羰基配合物及其红外v（CO）能量的比较。该比较表明，新的中性配体仅比相应的阴离子氢三（唑基）硼酸酯配体弱一些。这可以通过附着的nmi环稳定远离配位金属的正电荷的能力来解释，这也可以解释以下事实：[（nmi）B（吡唑基），]配体比铁的配体实质上更强类似的中性三（吡唑基）甲烷配体。

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