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Stereoisomerism02:52

Stereoisomerism

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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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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, SCN− can...
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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

3.5K
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.
3.5K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.2K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Prochirality02:05

Prochirality

5.2K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Eu(III) Chiral Coordination Polymer with a Structural Transformation System.

Naoyuki Koiso1, Yuichi Kitagawa2, Takayuki Nakanishi2

  • 1TOSOH Corporation , 2743-1, Hayakawa, Ayase, Kanagawa 252-1123, Japan.

Inorganic Chemistry
|April 28, 2017
PubMed
Summary

This study reports a luminescent Europium(III) chiral coordination polymer, [Eu(hfa)3((R)-bidp)]n, exhibiting a helical structure and high thermal stability. It undergoes a reversible transformation from polymer to monomer in liquid media, revealing distinct chiroptical properties.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Luminescent Materials

Background:

  • Chiral coordination polymers offer unique properties for advanced applications.
  • Europium(III) complexes are known for their characteristic luminescence.
  • Structural transformations in coordination polymers can lead to tunable functionalities.

Purpose of the Study:

  • To synthesize and characterize a novel luminescent chiral coordination polymer of Europium(III).
  • To investigate the structural transformation behavior of the polymer in different media.
  • To evaluate the photophysical and chiroptical properties of the material.

Main Methods:

  • Single-crystal X-ray analysis to determine the polymer structure.
  • Thermogravimetric analysis for thermal stability assessment.
  • Spectroscopic techniques (luminescence, circular dichroism, circularly polarized luminescence) for property evaluation.

Main Results:

  • A helical coordination polymer structure, [Eu(hfa)3((R)-bidp)]n, was successfully synthesized.
  • The polymer exhibited high thermal stability (320 °C) and strong luminescence (76% quantum yield).
  • The material demonstrated a reversible structural transformation from polymer to monomer in liquid media, with distinct chiroptical properties in monomer form.

Conclusions:

  • The synthesized Eu(III) chiral coordination polymer possesses a unique helical structure and exhibits excellent thermal and luminescent properties.
  • The reversible structural transformation system allows for modulation of its properties, opening avenues for responsive materials.
  • This work highlights the potential of chiral coordination polymers with dynamic structural behavior for advanced optical applications.