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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

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...
Naming Enantiomers02:21

Naming Enantiomers

The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three steps:...
Prochirality02:05

Prochirality

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Structural Isomerism02:34

Structural Isomerism

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 be...
Stereochemical Effects of Enolization01:12

Stereochemical Effects of Enolization

The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.

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Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
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Published on: July 28, 2018

The first enantiopure lanthanoid cryptate.

Tuba Güden-Silber1, Christine Doffek, Carlos Platas-Iglesias

  • 1Inorganic Chemistry I, Department of Chemistry and Biochemistry, Ruhr-University Bochum, 44780 Bochum, Germany. michael.seitz@rub.de.

Dalton Transactions (Cambridge, England : 2003)
|August 10, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed the first enantiomerically pure 2,2'-bipyridine cryptand. This ligand forms pure cryptates with lanthanoids, and the Ytterbium (Yb) cryptate exhibits near-infrared photoluminescence.

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Photophysics

Background:

  • 2,2'-bipyridine derivatives are crucial ligands in coordination chemistry.
  • Chiral cryptands offer unique three-dimensional binding environments.
  • Lanthanoid complexes are of interest for their luminescent properties.

Purpose of the Study:

  • To synthesize the first enantiomerically pure 2,2ipyridine-based cryptand.
  • To investigate the complexation of this cryptand with trivalent lanthanoid ions.
  • To characterize the photophysical properties of the resulting lanthanoid cryptates.

Main Methods:

  • Synthesis of a novel chiral 2,2ipyridine-based cryptand.
  • Complexation reactions with Ytterbium (Yb) and Lutetium (Lu) salts.
  • Spectroscopic analysis (NMR, UV-Vis, luminescence) to confirm structure and purity.
  • Lifetime measurements of luminescence.

Main Results:

  • Successful synthesis of the first enantiomerically pure 2,2ipyridine-based cryptand.
  • Formation of enantiomerically and diastereomerically pure cryptates upon complexation with Yb3+ and Lu3+.
  • Observation of near-infrared photoluminescence from the Yb3+ cryptate.
  • Measured luminescence lifetime of up to 29.8 μs for the Yb3+ cryptate in CD3OD.

Conclusions:

  • The developed chiral cryptand provides access to enantiopure lanthanoid cryptates.
  • These chiral lanthanoid cryptates are promising for applications in chiroptical sensing and imaging.
  • The Yb3+ cryptate's luminescence properties warrant further investigation for potential use in optical devices.