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Here, we demonstrate a unique, relatively low-temperature, molten-salt synthesis method for preparing uniform complex metal oxide lanthanum hafnate...
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The NMR-solution structure of a metallochaperone model peptide with Cu (I) was determined, and a detailed protocol from sample preparation and 1D and 2D data collection to a three-dimensional structure is...
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Properties of Transition Metals02:58

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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一个全金属反芳香分子 (Al4Li4) 的稳定过渡金属复合物:复合物的作用.

Ayan Datta1, Swapan K Pati

  • 1Theoretical Sciences Unit and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur Campus, Bangalore 560 064, India.

Journal of the American Chemical Society
|March 10, 2005
PubMed
概括

研究人员首次用全金属抗芳香分子Al4Li4制造了稳定的过渡金属复合物. 这种稳定类似于有机分子,在无机化学中开辟了新的途径.

科学领域:

  • 无机化学 无机化学
  • 计算化学计算化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 全金属芳香和反芳香物种具有显著的兴趣.
  • 活性物种的稳定对于它们的研究和应用至关重要.
  • 有机芳香分子,如环丁 (C4H4) 形成稳定的过渡金属复合体.

研究的目的:

  • 提出和描述全金属反芳香分子Al4Li4.4的稳定过渡金属复合体.
  • 研究过渡金属对Al4Li4.4的稳定作用.
  • 将这些新型无机复合物的特性与它们的有机对应物进行比较.

主要方法:

  • 密度函数理论 (DFT) 的计算.
  • 对碎片化能量进行分析.
  • 轨道相关性能量分析.
  • 核独立化学转移 (NICS) 值的计算.

主要成果:

  • 已经成功地提出了Al4Li4的几个稳定的过渡金属复合物,包括[eta4- ((Al4Li4) -Fe ((CO) 3 ,eta2,sigma2- ((Al4Li4) -Ni 和 (Al4Li4) 2Ni].
  • 与3d过渡金属的复合显著稳定了Al4Li4核心.

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  • 复合减少了边界轨道能量,并诱导了Al4Li4联体中的芳香特性.
  • 进行了与有机金属类似物进行能量比较.

    • 结论:

    • 过渡金属复合是一种可行的策略,可以稳定像Al4Li4.4这样的全金属反芳香物种.
    • 这些新型无机复合体具有独特的电子特性和稳定性.
    • 这些发现提供了一个新的类别的化合物,类似于有机金属化学.