Large pore donor–acceptor covalent organic frameworks

Design Principles for Covalent Organic Frameworks in Energy Storage Applications

“…[74] Although no direct photoinduced current was measured, the observed fluorescence lifetimes for D TP -A NDI -COF and D TP -A PyrDI -COF of 0.92 and 1.0 ns, respectively,c onfirmed that charget ransfer occurred between adjacent donor and acceptor molecules. Jin et al synthesized two COFs by using triphenylene as the donor component and either naphthaline diimide (D TP -A NDI -COF)o r pyrromellitic diimide( D TP -A PyrDI -COF) as the acceptorc omponents.…”

Photoactive and Conducting Covalent Organic Frameworks

“…[21] The D TP -A NDI COF formed by the condensation of triphenylene and naphthalene diimide subunits exhibits very large hexagonal open pores of 5.3 nm in diameter (Figure 3a). For this COF, time-resolved electron spin resonance spectroscopy (TR-ESR) measurements revealed a charge transfer state lifetime of 2.5 µs, indicating the presence of long-lived radical species originating from an efficient charge transfer from the triphenylene donor phase to the naphthalene diimide acceptor phase.…”

“…The measurements revealed high charge carrier mobility of 3.0 cm 2 V −1 s −1 for COF-66 and 8. [21] Copyright 2013, Royal Society of Chemistry. b) TT-COF with PCBM acceptor molecules penetrating into the porous COF network.…”

Triplet transport in thin films: fundamentals and applications

“…121 In other donor-acceptor COFs, e.g. triphenylenenapthalene diimide, 122 shortened lifetimes given by timeresolved fluorescence spectroscopy of the donor, coupled with electron paramagnetic resonance spectroscopy, indicate enhanced photoinduced charge separation. Time-resolved microwave conductivity showed that the electron-withdrawing benzothiadiazole units within the framework could induce electron transport in a Ni-phthalocyanine COF (mobility B0.6 cm 2 V À1 s À1 ).…”