Abstract
The flexible aniline-based conjugated microporous polymers with N–H and C–N bonds have excellent performances, but the flexible aniline-based covalent organic frameworks (COFs) have not been reported. In this paper, the flexible aniline-based COFs (TAPBDA and HAPBDA) were prepared by Schiff base reactions with flexible triazine-based aldehydes (TPT−3−CHO) and cyclophosphazene-based aldehydes (NOP−6−CHO), and flexible N1-(4-aminophenyl)benzene-1,4-diamine (APBDA) for the first time. They have 2D hexagonal and 3D triangular pores and flexible units which make the pores elastic and self-adaptable abilities. The resulting flexible aniline-based COFs exhibit high heat stability and some crystallization, and have fairly maximum adsorption capacities for I2 of 3.87 and 4.14 g g−1 with good recyclability. The flexible aniline-based COFs show good fluorescent properties both in solid and dispersion states and can be used for sensing picric acid (PA) with high quenching constants (KSV) of 2.82 × 104 and 1.66 × 104 L mol−1. Impressively, HAPBDA has excellent fluorescence sensing performance for iodine with KSV up to 9.98 × 104 L−1 mol.
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