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Saturated Linkers in Two-Dimensional Covalent Organic Frameworks Boost Their Luminescence.

Meijia YangHiroki HanayamaLong FangMatthew A AddicoatYunyu GuoRobert GrafKoji HaranoJun KikkawaEnquan JinAkimitsu NaritaKlaus Müllen
Published in: Journal of the American Chemical Society (2023)
The development of highly luminescent two-dimensional covalent organic frameworks (COFs) for sensing applications remains challenging. To suppress commonly observed photoluminescence quenching of COFs, we propose a strategy involving interrupting the intralayer conjugation and interlayer interactions using cyclohexane as the linker unit. By variation of the building block structures, imine-bonded COFs with various topologies and porosities are obtained. Experimental and theoretical analyses of these COFs disclose high crystallinity and large interlayer distances, demonstrating enhanced emission with record-high photoluminescence quantum yields of up to 57% in the solid state. The resulting cyclohexane-linked COF also exhibits excellent sensing performance for the trace recognition of Fe 3+ ions, explosive and toxic picric acid, and phenyl glyoxylic acid as metabolites. These findings inspire a facile and general strategy to develop highly emissive imine-bonded COFs for detecting various molecules.
Keyphrases
  • quantum dots
  • energy transfer
  • solid state
  • sensitive detection
  • light emitting
  • metal organic framework
  • water soluble
  • solar cells
  • heavy metals