Optical Properties of Fluorinated Precursors to Porous Molecular Crystals
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Abstract
The effect of fluorination on the chemical and physical characteristics of organic porous materials is reviewed in Chapter 1. The fluorinated aromatic triazine discussed in Chapter 2 is a precursor to a porous molecular crystal. Its intramolecular rotations are flexible due to the repulsion between neighboring atoms of fluorine and nitrogen. Restriction of the intramolecular rotations by molecular aggregation can turn ON the fluorescence of the fluorinated aromatic triazine. Chapter 3 presents the fluorescence of the fluorinated aromatic triazine can also be turned ON by assembly after the addition of phthalic acid. The two carboxyl groups in phthalic acid can hold two molecules of fluorinated aromatic triazine close to each other, which restricted the intramolecular rotations of the fluorinated aromatic triazine and turned fluorescence on. In Chapter 4, a tetraphenylethylene grafted with fluorinated aromatics is described, which formed different solvated crystals with DMF and showed sensitive or inert response of solid-state fluorescence to DMF. In Chapter 5, the synthesis, spectra of absorption and emission in solution and aggregation, and photoreactions of five fluorinated tetraphenylethylene derivatives is presented.