SETI Institute, Mountain View, CA 94043, USA.
Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA.
Dalton Trans. 2022 Nov 29;51(46):17753-17761. doi: 10.1039/d2dt02600g.
We have performed and analyzed the first combined Eu and Fe nuclear resonant vibrational spectroscopy (NRVS) for naturally abundant KEu(III)[Fe(II)(CN)] and Eu(III)[Fe(III)(CN)] complexes. Comparison of the observed Eu Fe NRVS spectroscopic features confirms that Eu(III) in both KEu(III)[Fe(II)(CN)] and Eu(III)[Fe(III)(CN)] occupies a position outside the [Fe(CN)] core and coordinates to the N atoms of the CN ions, whereas Fe(III) or Fe(II) occupies the site inside the [Fe(CN)] core and coordinates to the C atoms of the CN ions. In addition to the spectroscopic interest, the results from this study provide invaluable insights for the design and evaluation of the nanoparticles of such complexes as potential cellular contrast agents for their use in magnetic resonance imaging. The combined Eu and Fe NRVS measurements are also among the first few explorations of bi-isotopic NRVS experiments.
我们对天然丰度的 KEu(III)[Fe(II)(CN)]和 Eu(III)[Fe(III)(CN)]配合物进行了首次 Eu 和 Fe 核共振振动光谱（NRVS）的实验和分析。观察到的 Eu-Fe NRVS 光谱特征的比较证实，Eu(III)在 KEu(III)[Fe(II)(CN)]和 Eu(III)[Fe(III)(CN)]中都占据了[Fe(CN)]核心之外的位置，并与 CN 离子的 N 原子配位，而 Fe(III)或 Fe(II)占据了[Fe(CN)]核心内部的位置，并与 CN 离子的 C 原子配位。除了光谱学的兴趣外，这项研究的结果为设计和评估此类配合物的纳米粒子提供了宝贵的见解，因为它们有可能成为磁共振成像中潜在的细胞对比剂。Eu 和 Fe 的联合 NRVS 测量也是生物双同位素 NRVS 实验的首批探索之一。
