ArticleAngewandte Chemie (International ed. in English)2026
Imine Linkage Isomerism in Layer-Entangled Three-Dimensional Covalent Organic Frameworks Modulates Fluorescent Sensing.
Article in Angewandte Chemie (International ed. in English), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Three-dimensional covalent organic frameworks (3D COFs) constructed from entangled two-dimensional layers represent a rare yet intriguing structural class; however, the influence of variations in linkage structure within such architectures remains unexplored. Herein, we investigate a linkage-isomeric pair of isoreticular layer-entangled 3D COFs with opposite imine bond orientations (3D-An-CN-COF and 3D-An-NC-COF). Remarkably, although these two frameworks share nearly identical composition, topology, and porosity, the subtle difference in C═N bond orientation leads to pronounced differences in their optoelectronic properties and fluorescent sensing behaviors. In particular, 3D-An-CN-COF exhibits nearly an order-of-magnitude higher sensitivity toward 2,4,6-trinitrophenol (TNP) in aqueous media than 3D-An-NC-COF, with a quenching constant of 3.27 × 10
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