Recently there has been a great deal of interest and associated research into aspects of the coordination chemistry of lanthanides and bismuth—elements that show intriguing common features. This work focuses on the synthesis and characterization of a novel bismuth(III) polynuclear metallamacrocyclic complex derived from aminohydroxamic acid, in order to compare the coordination ability of Bi3+ with the similarly sized La3+ ions. A polynuclear tyrosinehydroximate Bi(OH)[15-MCCu(II)Tyrha-5](NO3)2 (1) was obtained according to the synthetic routes previously described for water-soluble Ln(III)-Cu(II) 15-MC-5 metallacrowns. Correlations between structural parameters of Bi(III) and Ln(III) complexes were analyzed. DFT calculations confirmed the similarity between molecular structures of the model bismuth(III) and lanthanum(III) tyrosinehydroximate 15-metallacrowns-5. Analysis of the electronic structures revealed, however, stronger donor-acceptor interactions between the central ion and the metallamacrocycle in the case of the lanthanum analogue. Thermochromic properties of 1 were studied.

中文翻译：

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水溶性铋(III)多核酪氨酸肟酸金属大环配合物：结构与镧系金属冠相似

最近，人们对镧系元素和铋元素的配位化学方面产生了极大的兴趣和相关研究，这些元素显示出有趣的共同特征。本工作重点是从氨基异羟肟酸衍生的新型铋(III)多核金属大环配合物的合成和表征，以比较Bi3+与类似尺寸的La3+离子的配位能力。根据之前水溶性 Ln(III)-Cu(II) 15-MC 的合成路线，得到多核酪氨酸肟酸 Bi(OH)[15-MCCu(II)Tyrha-5](NO3)2 (1) -5金属皇冠。分析了 Bi(III) 和 Ln(III) 配合物结构参数之间的相关性。DFT 计算证实了模型铋(III) 和镧(III) 酪氨酸肟酸盐15-metalacrowns-5 的分子结构之间的相似性。然而，电子结构分析表明，在镧类似物的情况下，中心离子和金属大环之间存在更强的供体-受体相互作用。研究了1的热致变色特性。