@article {47502,
	title = {Photoactive anthraquinone-based host-guest assembly for long-lived charge separation},
	journal = {Journal of Physical Chemistry C },
	volume = {125},
	year = {2021},
	month = {MAY},
	pages = {10891-10900},
	type = {Article},
	abstract = {Porous 2D covalent organic frameworks (COF) that are assembled axially through weak p-stacking interactions can provide reticular charge transport channels while playing host to kinetically stabilized reactive molecular redox states. Here we demonstrate a host-guest supramolecular charge transfer (CT) assembly using photoactive anthraquinone-based COF as an acceptor while incarcerating the electron donor N,N-dimethylaniline (DMA) inside it. Employing femtosecond broadband transient absorption spectroscopy in combination with electron paramagnetic resonance (EPR) studies, we show that the CT occurs rapidly within <110 fs after photoexcitation, subsequently leading to long-lived charge separation with 13\% quantum efficiency at room temperature. The photoinduced EPR signature of the long-lived confined DMA cation radical confirms the disparate regions of charge localization while H-1-C-13 correlation experiments using solid-state NMR spectroscopy enumerate the packing of the amines inside the host-guest COF assembly. Our work demonstrates the potency of charge transport pathways in supramolecular assemblies for efficient charge separation which if optimally tuned should pave the way for COF-based photocatalytic reaction centers.},
	issn = {1932-7447},
	doi = {10.1021/acs.jpcc.1c02497},
	author = {Jha, Ajay and Mote, Kaustubh R. and Chandra, Suman and Madhu, Perunthiruthy K. and Dasgupta, Jyotishman}
}
