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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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相关实验视频

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Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
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在稀土元素中构成高石的结构.

Sebastian T Mergelsberg1, Alex J Kugler1, Elaine D Flynn2

  • 1Pacific Northwest National Laboratory Richland Washington 99354 USA sebastian.mergelsberg@pnnl.gov eugene.ilton@pnnl.gov.

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概括

铁氧化物矿物中的稀土元素很难提取. 这项研究揭示了REEs可以通过质子铁空隙融入戈伊结构,从而影响其从离子吸附沉积物中提取.

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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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科学领域:

  • 地质化学
  • 矿物学
  • 材料科学

背景情况:

  • 稀土元素对于现代技术至关重要.
  • 在离子吸附沉积物 (IAD) 中,大量的REEs由氧化铁矿物质,主要是石,作为宿主.
  • 由于被认为是结构上的合并,这些含有甲基的REEs通常被认为是不可提取的.

研究的目的:

  • 研究REEs与其前体铁酸盐 (FH) 的原子级兼容性和结合机制.
  • 了解铁氧化中可再生能源占用的能量优势和结构位置.
  • 澄清铁氧化在地质过程中的REE分离中的作用.

主要方法:

  • 探测局部原子结构的X射线对分布函数分析 (PDF).
  • 扩展X射线吸收细结构 (EXAFS) 光谱以确定协调环境.
  • 开始分子动力学 (AIMD) 模拟以建模EXAFS数据并探索纳入机制.

主要成果:

  • REE与石和FH的兼容性遵循Lu ≥ Yb ≫ Dy > Nd的趋势.
  • (Nd) 和 (Dy) 主要形成二次无形相,在有限的程度上被纳入去 (<30%).
  • (Lu) 和伊特尔 (Yb) 显著地融入了类似戈伊的结构,由质子化铁空隙和边缘共享配置促进.

结论:

  • 这项研究阐明了REE融入石的原子尺度机制,挑战了以前关于简单替代的假设.
  • 具有质子铁的空位和特定的协调环境是将Lu和Yb等更大的REEs容纳在石格子中的关键.
  • 这种结合机制表明,在气候变化过程中发生REE分离,形成横岩和离子吸附沉积物.