Functionality-dependent electrical conductivity in two-dimensional covalent organic frameworks

摘要: Two-dimensional (2D) covalent organic frameworks (COFs) represent a unique structural paradigm owing to their intriguing properties. The diverse chemical tunability and good charge carrier mobility make these materials suitable for electronics and optoelectronic applications. However, the poor conductivity and processability restrict their full potential in device fabrication. Several strategies were followed to improve the conductivity in 2D COFs, including redox-active linkers and doping. Herein, we report four 2D COFs, by modulating the substituents on one of the monomeric units. Interestingly, less-bulky groups (H and OH) yielded a Kagome lattice in ETTA-TA- and ETTA-DHTA-COFs, whereas square-grid networks were obtained for ETTA-An-ph- and ETTA-BPTA-COFs with bulky substituents (anthracene and propargylic moieties). Further, we investigated the effect of the topology and the functionalities of these …