Redox-bipolar mesoporous two-dimensional covalent organic framework for multi-color electrochromism.

ABSTRACT: Two-dimensional covalent organic frameworks (COFs) are promising for electrochromic applications, yet most current systems are limited to microporous, monopolar, imine-linked COFs with inefficient ion utilization and electron transport. Here, we report a mesoporous, hexagonal bipolar COF constructed from triphenylamine (donor) and naphthalene dianhydride (acceptor) units, forming a donor-acceptor (D-A) heterostructure with dual redox-active sites. This architecture facilitates efficient bidirectional ion transport and intramolecular charge transfer, leading to reversible coupling of redox units 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA/NTCDA)^·- and N⁴,N⁴-bis[4'-amino-(1,1'-biphenyl)-4-yl]-(1,1'-biphenyl)-4,4'-diamine (TAAB/TAAB

SUBMITTER: Bao B 

PROVIDER: S-EPMC12525548 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature