View in EDS

Benzobisthiazole-based Regioisomeric Donor-Acceptor Covalent Organic Frameworks for Photocatalytic Hydrogen Peroxide Production.

Saved in:
Bibliographic Details
Title: Benzobisthiazole-based Regioisomeric Donor-Acceptor Covalent Organic Frameworks for Photocatalytic Hydrogen Peroxide Production.
Authors: Li, Ruo-Fan1 (AUTHOR), Huo, Ran1 (AUTHOR), Zhang, Zhao-Hui1 (AUTHOR), Lu, Yong-Chao1 (AUTHOR), Fan, Pei1 (AUTHOR), Zhang, Xuan2 (AUTHOR), Su, Tan2 (AUTHOR) sutan_jlu@jlu.edu.cn, Wu, Qiao-Lin1 (AUTHOR) wuql@jlu.edu.cn, Chen, Long1 (AUTHOR) longchen@jlu.edu.cn
Source: Chinese Journal of Polymer Science (Springer Science & Business Media B.V.). May2026, Vol. 44 Issue 5, p1201-1211. 11p.
Subjects: Isomerization, Photocatalysis, Photocatalytic oxidation, Exciton theory, Benzothiazole, Conjugated systems
Abstract: This study develops an effective molecular isomerization strategy to enhance photocatalytic hydrogen peroxide (H2O2) production by leveraging the structural tunability of benzobisthiazole (BT)—an electron-deficient planar heterocycle with superior optoelectronic properties and chemical stability. Unlike conventional isomeric covalent organic frameworks (COFs) which focus on symmetric or unidirectional conjugation systems, we exploit the two orthogonal π-conjugation pathways (2,6- versus 4,8-substitution) of BT to construct regioisomeric COFs with distinct topological connectivity, a design that remains rarely explored for photocatalytic H2O2 generation. Utilizing subsitution-position flexibility of BT, two regioisomeric monomers, namely 2,6-BT-CHO and 4,8-BT-CHOpro, were designed and polymerized into highly crystalline donor-acceptor (D-A) covalent organic frameworks (COFs): 2,6-BT-COF and 4,8-BT-COF. These COFs exhibit high surface areas, extended π-conjugation, and excellent light-harvesting capabilities, rendering them ideal photocatalysts. Remarkably, under visible-light irradiation in pure water, 2,6-BT-COF achieved a H2O2 production rate of 1638 µmol·g−1·h−1, outperforming 4,8-BT-COF (1046 µmol·g−1·h−1) by about 57%. Structural and photophysical analyses reveal that this pronounced performance difference stems from the critical influence of molecular topology on charge separation, exciton dissociation, and redox kinetics. Specifically, 2,6-BT-COF facilitates more efficient intramolecular charge transfer and suppresses charge recombination losses compared its 4,8-substituted counterpart. This work not only presents two novel, structurally well-defined COF photocatalysts but also establishes a design principle for optimizing photocatalytic efficiency through precise control of molecular connectivity. [ABSTRACT FROM AUTHOR]
Copyright of Chinese Journal of Polymer Science (Springer Science & Business Media B.V.) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:This study develops an effective molecular isomerization strategy to enhance photocatalytic hydrogen peroxide (H2O2) production by leveraging the structural tunability of benzobisthiazole (BT)—an electron-deficient planar heterocycle with superior optoelectronic properties and chemical stability. Unlike conventional isomeric covalent organic frameworks (COFs) which focus on symmetric or unidirectional conjugation systems, we exploit the two orthogonal π-conjugation pathways (2,6- versus 4,8-substitution) of BT to construct regioisomeric COFs with distinct topological connectivity, a design that remains rarely explored for photocatalytic H2O2 generation. Utilizing subsitution-position flexibility of BT, two regioisomeric monomers, namely 2,6-BT-CHO and 4,8-BT-CHOpro, were designed and polymerized into highly crystalline donor-acceptor (D-A) covalent organic frameworks (COFs): 2,6-BT-COF and 4,8-BT-COF. These COFs exhibit high surface areas, extended π-conjugation, and excellent light-harvesting capabilities, rendering them ideal photocatalysts. Remarkably, under visible-light irradiation in pure water, 2,6-BT-COF achieved a H2O2 production rate of 1638 µmol·g−1·h−1, outperforming 4,8-BT-COF (1046 µmol·g−1·h−1) by about 57%. Structural and photophysical analyses reveal that this pronounced performance difference stems from the critical influence of molecular topology on charge separation, exciton dissociation, and redox kinetics. Specifically, 2,6-BT-COF facilitates more efficient intramolecular charge transfer and suppresses charge recombination losses compared its 4,8-substituted counterpart. This work not only presents two novel, structurally well-defined COF photocatalysts but also establishes a design principle for optimizing photocatalytic efficiency through precise control of molecular connectivity. [ABSTRACT FROM AUTHOR]
ISSN:02567679
DOI:10.1007/s10118-025-3551-z