trans effect

简明释义

转移效应

英英释义

例句

1.The trans effect can lead to unexpected results in substitution reactions involving transition metals.

在涉及过渡金属的取代反应中，trans effect（横向效应）可能导致意想不到的结果。

2.In organometallic chemistry, understanding the trans effect can help predict reaction pathways.

在有机金属化学中，理解trans effect（横向效应）可以帮助预测反应途径。

3.Chemists often utilize the trans effect when designing catalysts for specific reactions.

化学家在设计特定反应的催化剂时，常常利用trans effect（横向效应）。

4.The strength of the trans effect varies among different ligands, influencing the stability of metal complexes.

不同配体之间的trans effect（横向效应）强度不同，这会影响金属络合物的稳定性。

5.The trans effect in coordination chemistry refers to the influence of a ligand on the properties of another ligand that is situated opposite it in the coordination sphere.

在配位化学中，trans effect（横向效应）指的是一个配体对位于其对面的另一个配体性质的影响。

作文

The concept of the trans effect plays a crucial role in coordination chemistry, particularly when discussing the properties of transition metal complexes. To understand this phenomenon, we must first delve into the nature of these complexes and how ligands interact with metal ions. Transition metals possess unique electronic configurations that allow them to form various coordination compounds with different ligands. These ligands can significantly influence the stability and reactivity of the metal center, and this is where the trans effect becomes relevant.The trans effect refers to the ability of certain ligands to exert an influence on the properties of other ligands located opposite to them in a coordination complex. Specifically, it describes how the presence of a strong field ligand trans to a weaker field ligand can enhance the overall stability of the complex. This effect is particularly notable in octahedral complexes, where six ligands surround a central metal ion. The arrangement of these ligands can lead to variations in the electronic environment of the metal, thus affecting its chemical behavior.For example, consider a complex formed with a transition metal ion and two different types of ligands: a strong field ligand such as CN⁻ and a weaker field ligand like H₂O. When CN⁻ is positioned trans to H₂O, the trans effect comes into play. The strong field nature of CN⁻ will stabilize the metal-ligand bond, which in turn influences the bond strength of the H₂O ligand. As a result, the overall stability of the complex is enhanced due to the favorable interactions between the ligands.Moreover, the trans effect can also be observed in the context of substitution reactions. In these reactions, the presence of a strong field ligand can facilitate the replacement of a weaker ligand that is trans to it. This phenomenon is particularly useful in synthetic chemistry, where chemists often aim to control the formation of specific products. By strategically choosing ligands that exhibit a pronounced trans effect, chemists can manipulate reaction pathways and achieve desired outcomes.Understanding the trans effect not only aids in predicting the behavior of coordination complexes but also enhances our knowledge of ligand design. By selecting ligands that exhibit strong trans effects, researchers can create more stable and reactive metal complexes for various applications, including catalysis and materials science. This insight has profound implications in the development of new technologies and chemical processes.In conclusion, the trans effect is a fundamental concept in coordination chemistry that highlights the intricate relationship between ligands and transition metal ions. Its significance extends beyond theoretical understanding, impacting practical applications in the synthesis and manipulation of metal complexes. As we continue to explore the world of coordination compounds, the trans effect remains a vital tool for chemists seeking to innovate and advance the field of chemistry.

“trans effect”的概念在配位化学中扮演着至关重要的角色，特别是在讨论过渡金属络合物的性质时。要理解这一现象，我们必须首先深入了解这些络合物的性质以及配体如何与金属离子相互作用。过渡金属具有独特的电子构型，使其能够与不同的配体形成各种配位化合物。这些配体可以显著影响金属中心的稳定性和反应性，而这正是trans effect变得相关的地方。trans effect指的是某些配体在配位络合物中对位于其对面的其他配体施加影响的能力。具体来说，它描述了强场配体位于较弱场配体的对面时，如何增强络合物的整体稳定性。这一效应在八面体络合物中特别明显，在这些络合物中，六个配体围绕一个中心金属离子排列。这些配体的排列会导致金属的电子环境发生变化，从而影响其化学行为。例如，考虑一个由过渡金属离子和两种不同类型配体形成的络合物：强场配体如CN⁻和弱场配体如H₂O。当CN⁻位于H₂O的对面时，trans effect开始发挥作用。CN⁻的强场特性将稳定金属-配体键，这反过来又影响H₂O配体的键强度。因此，由于配体之间的有利相互作用，络合物的整体稳定性得到了增强。此外，trans effect还可以在取代反应的背景下观察到。在这些反应中，强场配体的存在可以促进与其对面位置的较弱配体的替换。这一现象在合成化学中尤为重要，因为化学家们通常希望控制特定产物的形成。通过战略性地选择表现出明显trans effect的配体，化学家可以操纵反应途径并实现所需的结果。理解trans effect不仅有助于预测配位络合物的行为，还增强了我们对配体设计的认识。通过选择表现出强转位效应的配体，研究人员可以为各种应用创造更稳定和反应性的金属络合物，包括催化和材料科学。这一见解在新技术和化学过程的发展中具有深远的影响。总之，trans effect是配位化学中的一个基本概念，突显了配体与过渡金属离子之间复杂的关系。其重要性超越了理论理解，对金属络合物的合成和操纵的实际应用产生了影响。随着我们继续探索配位化合物的世界，trans effect仍然是化学家寻求创新和推动化学领域发展的重要工具。