Fig. 2: The bonding structure of materials.
From: Enhancing photocatalytic performance of covalent organic frameworks via ionic polarization
a The survey XPS spectra of TpPa-1 and CH3I-TpPa-1. b C 1 s High-resolution XPS spectra of TpPa-1 and CH3I-TpPa-1. c N 1 s High-resolution XPS spectra of TpPa-1 and CH3I-TpPa-1. d I 3 d High-resolution XPS spectra of CH3I-TpPa-1. e 13C CP/MAS NMR spectra of TpPa-1 and CH3I-TpPa-1. f The simulated structure of a fragment of CH3I-TpPa-1.
