素键驱动的连接体移位:共晶格子与协调键对比
Yury V Torubaev1, Omer Shaashua1, Savion Braunstein1
1Department of Chemistry, Ben-Gurion University of the Negev Beer-Sheva 84105, Israel.
Chemistry (Weinheim an der Bergstrasse, Germany)
|March 26, 2025
概括
素键可以取代铜和瓦纳基复合物的氨基联体,尽管它们通常比协调键弱. 这种连接物位移被晶格稳定放大,特别是在Jahn-Teller扭曲的Cu (II) 和瓦纳迪尔复合体中.
科学领域:
- 超分子化学 超分子化学
- 协调化学 协调化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 协调键通常比素键强度更高.
- 特定的电子配置,如Cu (II) 中的Jahn-Teller效应和vanadyl复合体中的trans影响,可以调节M-N键强度.
- 素结合 (XB) 涉及素原子的缺电子区域和富含电子的位点之间的相互作用.
研究的目的:
- 为了研究金属-链体协调键和素键之间的竞争性相互作用.
- 探索过渡金属乙甲酸复合物和素键捐赠者之间的共同晶体的形成.
- 了解这些系统中影响连接体移位的因素.
主要方法:
- 使用M(acac) 2(L) 复合物 (M=Cu(II),V(IV) =O;L=氨) 和1,4-二二四子 (1,4-DITFB) 的联合结晶实验.
- 进行X射线衍射分析,以表征得到的晶体结构.
- 计算研究以阐明对观察到的现象的能量贡献.
主要成果:
- 意想不到的形成单独的M{acac) 2·1,4-DITFB和L·1,4-DITFB共晶,而不是预期的M{acac) 2{(L) ·1,4-DITFB adducts.
- 有证据表明,素结合驱动的氨基联结物位移.
- 计算分析表明,虽然单独的素键可能不会破坏M-N键,但素结合产品的晶格稳定有助于移位.
结论:
- 素结合,特别是与格子稳定相结合时,可以克服特定过渡金属复合体中较弱的协调键.
- 在Cu (II) 中的Jahn-Teller扭曲和在瓦纳迪尔复合体中的转变影响在使带位移起到关键作用.
- 这项研究强调了协调强度,素结合和晶体包装效应之间的微妙相互作用.
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