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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

19.2K
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...
19.2K
Stereoisomerism02:52

Stereoisomerism

12.0K
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...
12.0K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
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...
14.4K
Isomerism02:43

Isomerism

18.5K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
18.5K
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

17.3K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
17.3K
Structure of Amines01:19

Structure of Amines

2.6K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.6K

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Related Experiment Video

Updated: Jul 11, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Structural Isomers: Small Change with Big Difference in Anion Storage.

Huichao Dai1, Yuan Chen1,2, Yueyue Cao1

  • 1School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.

Nano-Micro Letters
|November 13, 2023
PubMed
Summary

Two isomers of tetrathiafulvalene (TTF) and tetrathianaphthalene were investigated for organic batteries. The TTF isomer demonstrated superior anion storage capacity and voltage, highlighting the impact of molecular structure on battery performance.

Keywords:
Anion storageIsomersP-type organic electrode materialsSolid-state molecular rearrangementZinc-organic batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Organic Chemistry

Background:

  • Organic electrode materials offer potential for advanced batteries but face challenges like low capacity and unclear charge storage mechanisms.
  • Isomers provide a valuable platform for studying charge storage and enhancing battery performance, yet remain underexplored in battery research.

Purpose of the Study:

  • To investigate the anion storage mechanisms and electrochemical performance of two organic isomers for battery applications.
  • To elucidate how subtle structural differences between isomers influence their charge storage capabilities and overall battery performance.

Main Methods:

  • Electrochemical testing to evaluate specific capacity, discharge voltage, and rate capability.
  • Solid-state characterization including X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) spectroscopy to confirm molecular structure and transformations.

Main Results:

  • Tetrathiafulvalene (TTF) isomer reversibly stored two monovalent anions, achieving a specific capacity of 220 mAh g⁻¹ at 1.05 V (2 C).
  • Tetrathianaphthalene isomer stored only one anion before undergoing an irreversible rearrangement to TTF upon further oxidation.
  • Characterization confirmed the solid-state molecular rearrangement in tetrathianaphthalene, correlating structural changes with electrochemical behavior.

Conclusions:

  • Small structural modifications in organic isomers significantly impact anion storage capacity and electrochemical voltage in batteries.
  • This study underscores the importance of molecular design and isomer investigation for advancing organic battery technology.