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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Stereoisomerism02:52

Stereoisomerism

14.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.7K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Dynamic structural transformations of coordination supramolecular systems upon exogenous stimulation.

Cheng-Peng Li1, Jing Chen, Chun-Sen Liu

  • 1College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, MOE Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China. dumiao@public.tpt.tj.cn.

Chemical Communications (Cambridge, England)
|December 16, 2014
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Solid-state reactions, particularly single-crystal-to-single-crystal (SC-SC) transformations in coordination supramolecular systems (CSSs), offer a green chemistry route to novel functional materials. These dynamic systems exhibit property changes upon external stimuli, enabling tailored material design.

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Area of Science:

  • Solid-state chemistry
  • Supramolecular chemistry
  • Materials science

Background:

  • Single-crystal-to-single-crystal (SC-SC) transformations are solvent-free, green chemistry methods for creating crystalline materials.
  • Coordination supramolecular systems (CSSs), including coordination polymers (CPs) and metal-organic frameworks (MOFs), exhibit dynamic behavior in response to external stimuli.
  • These dynamic CSSs are crucial for developing new functional crystalline materials with tunable properties.

Purpose of the Study:

  • To review recent advancements in SC-SC transformations within CSSs.
  • To highlight the dynamic nature of CSSs and their responsiveness to various stimuli.
  • To demonstrate the potential of designing functional crystalline materials through controlled structural transformations.

Main Methods:

  • Focus on SC-SC transformations in coordination polymers and metal-organic frameworks.
  • Analysis of dynamic CSSs responding to stimuli like concentration, temperature, light, and mechanical force.
  • Investigation of structure-property relationships in dynamic crystalline materials.

Main Results:

  • Dynamic CSSs possess key characteristics: metastable metal centers, reactive ligands, flexible networks, and exchangeable guests.
  • Structural transformations in CSSs lead to significant changes in catalytic, sorption, magnetic, and luminescent properties.
  • These findings provide a proof-of-concept for designing novel functional crystalline materials.

Conclusions:

  • SC-SC transformations in CSSs represent a powerful green chemistry approach for materials innovation.
  • The dynamic nature of CSSs allows for stimuli-responsive materials with tunable functionalities.
  • This field holds significant promise for the rational design of advanced functional crystalline materials.