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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Structures of Carboxylic Acid Derivatives

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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
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Node Flexibility Unlocks Structural Adaptability and Guest Versatility of Anionocages.

Yu Tao1, Xianghua Lv1, Tao Chen1

  • 1Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, Xi'an Key Laboratory of Functional Supramolecular Structure and Materials, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China.

Angewandte Chemie (International Ed. in English)
|August 12, 2025
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Summary

Researchers developed flexible anionocages for encapsulating large guests, mimicking protein chemistry. These adaptable nanoscale cages show promise for applications in luminescence and chirality transfer.

Keywords:
AnionocageCage compoundsChiralHost‐guest

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Area of Science:

  • Supramolecular Chemistry
  • Nanotechnology
  • Materials Science

Background:

  • Anionocages are promising host molecules due to their nodal flexibility, mimicking protein self-assembly and host-guest chemistry.
  • Challenges in constructing large internal cavities have limited the application of anionocages.

Purpose of the Study:

  • To develop an effective strategy for enhancing node flexibility in anionocages.
  • To improve structural adaptability and guest encapsulation versatility of anionocages.
  • To create anionocages capable of encapsulating guests of unprecedented size.

Main Methods:

  • Utilizing anion coordination between a C3-symmetric tris-urea ligand (L) and an organophosphate (A) to generate flexible nodes.
  • Employing crystal structure analysis to identify distinct anionocage architectures (tetrahedron, trigonal antiprism, octahedron).
  • Investigating solution-phase interconversions among anionocages by modulating guest template, A/L ratio, and concentration.

Main Results:

  • Formation of three geometrically distinct anionocages (A4L4, A6L6, A6L8) with cavity sizes ranging from 0.208 to 1.320 nm³.
  • Demonstration of controlled interconversions among anionocages in solution.
  • Successful encapsulation of the luminescent metal complex [Ru(bpy)3]2+, leading to enhanced quantum yield and lifetime.
  • Induction of circularly polarized luminescence in racemic [Ru(bpy)3]2+ via chirality transfer using a chiral-anion-directed octahedral cage.

Conclusions:

  • Enhanced node flexibility is an effective strategy for creating anionocages with improved structural adaptability and guest encapsulation versatility.
  • The developed anionocages can encapsulate guests of unprecedented size and exhibit tunable interconversions.
  • These anionocages show potential for applications in luminescence enhancement and chiral sensing through chirality transfer.