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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.9K
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.
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Isomerization enabling near-infrared electron acceptors.

Jiasi Luo1, Yang Wang1, Bin Liu1

  • 1Department of Materials Science and Engineering, The Shenzhen Key Laboratory for Printed Organic Electronics, Southern University of Science and Technology (SUSTech) No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China wangy6@sustech.edu.cn guoxg@sustech.edu.cn.

RSC Advances
|May 11, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new near-infrared nonfullerene acceptor, DTA-IC-M, through isomerization. This material exhibits strong absorption over 800 nm, leading to improved performance in organic solar cells (OSCs).

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Nonfullerene acceptors are crucial for organic solar cell (OSC) efficiency.
  • Tuning molecular structure is key to optimizing light absorption and charge transport.

Purpose of the Study:

  • To synthesize and characterize a novel near-infrared nonfullerene acceptor, DTA-IC-M.
  • To investigate the effect of structural modification on optical and electronic properties.
  • To evaluate the performance of DTA-IC-M in OSC devices.

Main Methods:

  • Isomerization of a precursor molecule (DTA-IC-S) to create DTA-IC-M.
  • Spectroscopic analysis to determine absorption properties and bandgap.
  • Fabrication and testing of organic solar cells using DTA-IC-M.

Main Results:

  • A significant redshift of absorption (∼170 nm) was achieved, with DTA-IC-M absorbing over 800 nm.
  • DTA-IC-M possesses a narrow bandgap of 1.35 eV.
  • DTA-IC-M based OSCs demonstrated an enhanced short-circuit current of 12.96 mA cm⁻².

Conclusions:

  • Isomerization is an effective strategy for designing near-infrared nonfullerene acceptors.
  • DTA-IC-M shows great potential for high-performance organic solar cells.
  • The enhanced photo-to-current response in the near-infrared region contributes to improved device efficiency.