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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Development of bio-inspired chelates with hydrogne bond donors:synthesis an dstructure of monomeric metal acetate complexes with intramolecular hydrogen bonds
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Development of bio-inspired chelates with hydrogne bond donors:synthesis an dstructure of monomeric metal acetate complexes with intramolecular hydrogen bonds

机译：带有水合键供体的生物启发螯合物的开发：具有分子内氢键的单体金属乙酸盐配合物的合成

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摘要

The synthesis of th enew multidentate tripodal compounds bis[(N'-tert0butylureido)-N-ethyl]-2-pyridylmethylamine (H_41) and bis[(N'-tert0butylureido)-N-ethyl]-N-methylamine (H_41) is described.These ligands contain two urea-ethylene arms that when deprotonated and bound to a metal ion,position two hydrogen bond donors near the metal center so that formation of intramolecular H-bonds with other coordinated species is possible.The complexes K[M~II(H_21)(mu~1-OAc)] and K[M~II(H_22)(mu~1-OAc)](M~II=Co adn Fe) have been isolated and charactrized.The multidnetate ligands mediate the mode of acetate coordination:the [M~II(H_21)(mu~1-OAc)]~- complexes have a monodentate coordination,whereas in [M~II(H_22)(mu~1-OAc)]~- the acetate binds in a bidentate manner.X-ray diffraction studies reveal that all complexes have trigonal bipyramidal coordination geometries with one of the acetate oxygen atoms being nearly transt to the amine nitrogen donor.All the complexes hae relatively long M-O bond lengths in comparison with other M~II-OAc complexes charactrized previously.The complexes exhibit intramolecula rH-bonds from the urea NH groups to one of the coordinated oxygen atoms of the acetate,causing a lengthening of the M~II-OAc bond distances.The NH ...O bond lengths and vibrational energies in these acetate complexes support weaker H-bonds thatn the H-bonding interactions in similar ligand complexes with hydroxo ligands.
机译：新的多齿三脚架化合物双[（（N'-叔丁基脲基）-N-乙基] -2-吡啶基甲胺（H_41）和双[（N'-叔丁基丁基脲基）-N-乙基] -N-甲胺（H_41）的合成是这些配体包含两个脲-乙烯臂，当它们去质子化并结合到金属离子上时，在金属中心附近放置两个氢键供体，从而可能与其他配位物种形成分子内氢键。配合物K [M〜分离并表征了II（H_21）（mu〜1-OAc）和K [M〜II（H_22）（mu〜1-OAc）]（M〜II = Co和Fe）。多脱氢配体介导了该模式。乙酸盐配位：[M〜II（H_21）（mu〜1-OAc）]〜-配合物具有单齿配位，而在[M〜II（H_22）（mu〜1-OAc）]〜-中，乙酸酯结合X射线衍射研究表明，所有配合物均具有三角双锥体配位几何结构，其中乙酸氧原子之一几乎转移至胺氮供体。所有配合物均具有相对较长的MO键长度与先前表征的其他M〜II-OAc配合物相比，该配合物表现出从脲NH基团到乙酸盐的一个配位氧原子之一的分子内rH键，从而延长了M〜II-OAc键的距离。这些乙酸盐络合物中的NH ... O键长度和振动能支持较弱的H键，即类似的具有羟基配体的配体中的H键相互作用。

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