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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The lanthanide complexes of 2,2'- bipyridyl-6,6'dicarboxylic dimethylanilides: the influence of a secondary coordination sphere on the stability, structure, luminescence and f- element extraction
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The lanthanide complexes of 2,2'- bipyridyl-6,6'dicarboxylic dimethylanilides: the influence of a secondary coordination sphere on the stability, structure, luminescence and f- element extraction

机译:2,2'-双吡啶-6,6'Dicarboxic二甲基硅氧烷的镧系元络合物:二次配位球体对稳定性,结构,发光和F元素提取的影响

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摘要

Four of the six possible isomeric 2,2-bipyridyl-6,6-dicarboxylic dimethylanilides were studied from the point of view of the impact of a secondary coordination sphere on the formation of complexes with lanthanides in solution, as well as the crystal structure and photophysical properties of the complexes. All ligands form complexes with a 1:1 metal-to-ligand ratio with an lg(1) in the range of 6.0-8.8, and strong correlations between secondary coordination sphere modulation and stability of the complexes within the lanthanide series. Although substitution at the o-position of the aromatic ring leads to significant elongation of M-O-L bonds in a crystal, this significantly affects the stability of the complexes. The luminescence of the complexes is the most effective for europium complexes. From luminescence measurements of gadolinium complexes, the triplet energy levels of ligands were located as follows: o-methylated ligands show 10% higher levels than other isomers. Also, o-methylation of the phenyl ring increases the lifetime value while m-methylation reduces this value.
机译:六个可能的异构2,2-联吡啶基-6,6-二羧酸dimethylanilides的四个被从考虑到对形成的复合物的与镧系元素溶液的二次配位球的冲击点的研究,以及晶体结构和配合物的光物理特性。所有配体形成具有1络合物:1金属到配体的比率与在6.0-8.8范围内的LG(1),和第二配位球调制和镧系中的配合物的稳定性之间的强相关性。虽然在芳香环,因而在晶体的M-O-L键显著伸长的邻位取代,这显著影响复合物的稳定性。该复合物的发光是最有效的铕络合物等。从钆复合物的发光测量,配体的三重态能量水平位于如下:邻二甲基化的配体显示出更高的10%的水平比其它异构体。另外,苯环的邻 - 甲基化增加了寿命值而M-甲基化降低了此值。

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