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Related Concept Videos

Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic factors, steric factors also account...
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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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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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...
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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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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

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Published on: August 2, 2012

Steric effects control self-sorting in self-assembled clusters.

Amber M Johnson1, Richard J Hooley

  • 1Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA.

Inorganic Chemistry
|April 27, 2011
PubMed
Summary
This summary is machine-generated.

Bis(pyridine) ligands with internal substituents self-discriminate to form specific metal clusters. Ligand design controls self-sorting, enabling selective heterocluster assembly through steric interactions.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Endohedrally functionalized bis(pyridine) ligands offer unique structural properties.
  • Self-assembly of metal-ligand complexes is a key area in supramolecular chemistry.
  • Controlling self-sorting in complex systems remains a challenge.

Purpose of the Study:

  • To investigate the self-discrimination capabilities of endohedrally functionalized bis(pyridine) ligands.
  • To demonstrate selective heterocluster formation through ligand design.
  • To explore the role of internal substituents in controlling self-assembly.

Main Methods:

  • Synthesis of endohedrally functionalized bis(pyridine) ligands with varying internal substituents.
  • Coordination with metal ions to promote self-assembly.
  • Structural characterization of the resulting clusters using techniques like X-ray crystallography.
  • Analysis of noncovalent and space-filling interactions governing self-sorting.

Main Results:

  • Endohedrally functionalized bis(pyridine) ligands exhibit self-discrimination in the presence of coordinating metals.
  • The size of internal substituents precisely controls self-sorting behavior.
  • Selective formation of heteroclusters is achieved by tuning steric interactions.
  • Discrimination between ligands of identical geometry and donor type is demonstrated.

Conclusions:

  • Ligand design, specifically internal substituent size, is a powerful tool for controlling self-assembly and self-sorting.
  • This method provides a novel approach for creating complex, well-defined supramolecular structures.
  • The findings open new avenues for designing functional materials based on selective cluster formation.