fig1
Figure 1. FT-IR spectra of monomers and POFs: (A) SPPOF-4F; (B) SPPOF-8F; and XPS spectra enlarged views of C1s in (C) SPPOF-4F and (D) SPPOF-8F. FT-IR: Fourier transform infrared; POFs: porous organic frameworks; XPS: X-ray photoelectron spectroscopy.
