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A novel, photochromic N^C-chelate organoboron functionalized dipicolinic acid ( H 2 L ) has been designed and synthesized. Lanthanide(III) complexes based on this ligand ( L ) with the general formula [NBu 4 ] 3 [LnL 3 ] (Ln = Eu or Tb) were prepared. The new ligand was found to be effective in both sensitizing and photomodulating the emission of a Eu(III) ion. The photoisomerization conversion of the boryl chromophore attached to the ligand of the lanthanide complex was determined to be quantitative by NMR analysis of the La(III) analogue.
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Wang et al. (2018) studied this question.
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