Dipyrrin Complexes and Their Photophysical Applications
Summary
Dipyrrin ligands are bidentate tetrapyrrolic frameworks that form robust complexes with a wide range of metal ions. Their modular structure and strong π-conjugation confer intense absorption and tunable emission across the visible and near-infrared regions. Coordination to metals such as zinc, palladium or iridium introduces heavy-atom effects that promote intersystem crossing to triplet excited states, enabling efficient generation of reactive oxygen species or facilitating charge-transfer processes. These photophysical features underpin applications in photocatalysis, photodynamic therapy, fluorescence imaging and optoelectronic devices. Advances in ligand design, including heteroleptic architectures and supramolecular assemblies, have further enhanced quantum yields, bathochromic shifts and environmental sensitivity, thereby broadening the functional scope of dipyrrin complexes in both fundamental photophysics and practical technologies.
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Dipyrrin Complexes and Their Photophysical Applications publication trend
The graph below shows the total number of articles in dipyrrin complexes and their photophysical applications across all publications each year (not limited to Nature Index journals).
Technical terms
Dipyrrin: A bidentate ligand derived from two pyrrolic units linked by a methine bridge, capable of coordinating metals to form luminescent complexes.
Intersystem crossing (ISC): A non-radiative transition between electronic states of different spin multiplicity, often enhanced by heavy-atom coordination to populate triplet states.
Photoluminescence quantum yield (PLQY): The ratio of photons emitted to photons absorbed, reflecting the efficiency of radiative decay from an excited state.
Pseudo-Stokes shift: An apparent large separation between absorption and emission maxima arising from interligand energy transfer rather than structural relaxation.
Heavy-atom effect: Enhancement of spin–orbit coupling by incorporation of high-atomic-number elements, promoting intersystem crossing and triplet formation.
References
- Functional Supramolecular Architectures of Dipyrrin Complexes. Frontiers in Chemistry (2018).
- Metal Coordination Effects on the Photophysics of Dipyrrinato Photosensitizers. Molecules (2022).
- Intriguing Heteroleptic ZnII bis(dipyrrinato) Emitters in the Far-Red Region With Large Pseudo-Stokes Shift for Bioimaging. Frontiers in Chemistry (2021).
- Excited state dynamics of homoleptic Zn( ii )dipyrrin complexes and their application in photocatalysis. New Journal of Chemistry (2024).
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