Related Experiment Video
Updated: Aug 5, 2026

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Three-Component Vinylene-Linked Donor-Acceptor-Type Organic Semiconductive Covalent Organic Frameworks for Efficient
Jie Yang1, Runmei Li2, Yahu A Liu3
1School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China.
Researchers synthesized two donor-acceptor covalent organic frameworks (D-A COFs) for photocatalysis. Benzotrithiophene-based COF-1 showed enhanced properties and a higher hydrogen evolution reaction rate than COF-2.
Area of Science:
- Materials Science
- Photocatalysis
- Organic Chemistry
Background:
- Donor-acceptor covalent organic frameworks (D-A COFs) are promising for photocatalytic applications.
- Understanding the structure-property relationship in D-A COFs is crucial for optimizing their efficiency.
Purpose of the Study:
- To investigate the correlation between the structures of D-A COFs and their photocatalytic efficiency.
- To synthesize and characterize two novel D-A COFs, COF-1 and COF-2.
- To evaluate their performance in the photocatalytic hydrogen evolution reaction (HER).
Main Methods:
- Three-component Knoevenagel condensation reaction for COF synthesis.
- Characterization of optical and photoelectrical properties.
- Measurement of photocatalytic hydrogen evolution reaction (HER) rates.
Main Results:
- COF-1, based on benzotrithiophene, exhibited superior optical and photoelectrical properties compared to COF-2 (1,3,5-tri-(thiophen-2-yl)-benzene based).
- COF-1 achieved an impressive HER rate of approximately 69.1 mmol/g/h.
- COF-2 demonstrated an HER rate of approximately 56.6 mmol/g/h.
Conclusions:
- The structural differences between the benzotrithiophene and 1,3,5-tri-(thiophen-2-yl)-benzene units significantly impact COF performance.
- COF-1's superior photocatalytic activity is attributed to its distinct structural features.
- D-A COFs offer a tunable platform for efficient photocatalytic hydrogen production.
More Related Videos
06:49In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
08:29Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Thermal and Photochemical Electrocyclic Reactions: Overview
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Stability of Conjugated Dienes
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Thermal Electrocyclic Reactions: Stereochemistry
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.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview