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Enhancing Two-Photon Excited Fluorescence of Metal-Organic Framework Single Crystals through Modulation of Inorganic Nodes.

Ya-Ru MengMin-Jie XuShu-Fan LiBo-Cong LiGen ZhangJian Su
Published in: Inorganic chemistry (2024)
Regulation of the two-photon excited fluorescence (TPEF) emission intensity and wavelength of metal-organic framework (MOF) crystals with similar constitutions presents a significant challenge. In this study, two MOFs, Zn-BTPPA and Cd 3 -BTPPA, were constructed using tetrakis(1,1'-biphenyl-4-carboxylic acid)-1,4-benzenediamine (H 4 BTPPA) as the organic ligand and mononuclear Zn and trinuclear Cd 3 inorganic nodes, respectively. The incorporation of H 4 BTPPA within the MOF structures enables effective TPEF emission in both Zn-BTPPA and Cd 3 -BTPPA. The TPEF results show that Zn-BTPPA and Cd 3 -BTPPA exhibited strong emissions at 523 and 463 nm, respectively, when excited with a 780 nm laser. Moreover, Zn-BTPPA and Cd 3 -BTPPA exhibited much higher two-photon absorption cross sections, approximately 4.9 and 5.2 times higher than that of the reported dinuclear MOF, Cd 2 -BTPPA, with a similar composition, respectively. With different inorganic nodes, the stacking of chromophores, π···π interactions, and ligand geometry were found to correlate with the enhanced TPEF in Cd 3 -BTPPA and the blue-shifted TPEF in Zn-BTPPA. This work serves as an inspiration for designing efficient TPEF MOF materials based on the structure-property relationship.
Keyphrases
  • metal organic framework
  • heavy metals
  • nk cells
  • radiation therapy
  • living cells
  • lymph node
  • high resolution
  • single molecule
  • mass spectrometry
  • rectal cancer
  • sewage sludge