CCCCC pentadentate chelates with planar Möbius aromaticity and unique properties.

CCCCC pentadentate chelates with planar Möbius aromaticity and unique properties.
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CCCCC 五齿螯合物具有平面莫比乌斯芳香性和独特的性质

DOI:
10.1126/sciadv.1601031
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发表时间:
2016-08
期刊:
影响因子:
13.6
通讯作者:
Xia H
Xia H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhu C;Yang C;Wang Y;Lin G;Yang Y;Wang X;Zhu J;Chen X;Lu X;Liu G;Xia H

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平面Möbius芳族金属环具有近红外吸收光谱和金属原子的最高碳配位数。多齿螯合物中的配位原子主要是杂原子。我们提出了五齿酸螯合剂的第一个例子,所有的螯合剂的结合原子是碳原子,表示为CCCCC螯合剂。在过渡金属化学中,在赤道面上有多达5个金属-碳键的现象以前还没有被观察到。密度泛函理论计算表明,该平面金属环由12中心- 12电子π- π-共轭作用扩展了Craig-Möbius芳构性。这些平面螯合物在紫外-可见-近红外区域具有广泛的吸收,因此在808 nm激光照射下具有显着的光热性能,表明这些螯合物在光热治疗中具有潜在的应用前景。这些配合物的易合成、高稳定性和广泛吸收的特点使多齿碳链成为配位化学中一种新的结构单元。
Planar Möbius aromatic metallacycles show NIR absorption spectrum and the highest carbon coordination number for a metal atom. The coordinating atoms in polydentate chelates are primarily heteroatoms. We present the first examples of pentadentate chelates with all binding atoms of the chelating agent being carbon atoms, denoted as CCCCC chelates. Having up to five metal-carbon bonds in the equatorial plane has not been previously observed in transition metal chemistry. Density functional theory calculations showed that the planar metallacycle has extended Craig-Möbius aromaticity arising from 12-center–12-electron dπ-pπ π-conjugation. These planar chelates have broad absorption in the ultraviolet-visible–near-infrared region and, thus, notable photothermal performance upon irradiation by an 808-nm laser, indicating that these chelates have potential applications in photothermal therapy. The combination of facile synthesis, high stability, and broad absorption of these complexes could make the polydentate carbon chain a novel building block in coordination chemistry.
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