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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Pseudohalogeno complexes of sterically hindered tripyrrinatopalladium (TrpyPd) fragments
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Pseudohalogeno complexes of sterically hindered tripyrrinatopalladium (TrpyPd) fragments

机译:位阻三甲基吡啶铝(TrpyPd)片段的拟卤素配合物

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摘要

Eight new pseudohalogeno complexes of sterically hindered TrpyPd fragments 4-11 have been prepared by salt metathesis in one step from known trifluoroacetates TrpyPdOAc(F) 1-3, using sodium salts of N-3, NCO, NCS, NCSe, dicyanamide (dca) and tricyanomethanide (tcm) anions. Despite the propensity of the coligands to bind to two or more metal centres in a bridging coordination mode all new complexes have been shown by NMR spectroscopy to be essentially monomeric in solution. X-ray diffraction studies performed on TrpyPdNCS(6), TrpyPddca(8), TrpyPddca(9), and TrpyPdtcm(10) revealed the presence of two different conformers in the solid state, one with a helically distorted Trpy backbone for 6 and 10, and one with an almost planar tripyrrole but a tetrahedral distortion of the Pd-II coordination, a so-called pseudoplanar form, for 8 and 9. Interestingly the helical forms are also detected by unusual wavenumbers for the v(CN) stretching bands in their IR spectra. The reason for the occurrence of two different conformers in the solid state appears to be the crystal packing which depends mainly on the shape of the anionic co-ligand and on the presense of alkyl groups on the TrpyPd fragment.
机译:通过使用N-3,NCO,NCS,NCSe,双氰胺(dca)的钠盐从已知的三氟乙酸盐TrpyPdOAc(F)1-3一步进行盐复分解,制备了八种新的空间受阻的TrpyPd片段的假卤素配合物。和三氰胺(tcm)阴离子。尽管大肠菌倾向于以桥联配位方式结合到两个或多个金属中心,但所有新的络合物在NMR光谱中均显示为溶液中的单体。对TrpyPdNCS(6),TrpyPddca(8),TrpyPddca(9)和TrpyPdtcm(10)进行的X射线衍射研究显示,固态存在两种不同的构象异构体,其中一种具有螺旋形扭曲的Trpy主链(分别用于6和10)。 ,其中一个具有几乎为平面的三吡咯,但Pd-II配位的四面体畸变,即8和9的所谓的伪平面形式。有趣的是,螺旋形也可以通过在他们的红外光谱固态中出现两个不同构象异构体的原因似乎是晶体堆积,其主要取决于阴离子共配体的形状和TrpyPd片段上烷基的存在。

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