biostudies-literatureUnknown2(10)Mulyadi CHThe integration of multiple chromophore units into a single molecule is expected to improve the performance of photon upconversion based on triplet-triplet annihilation (TTA-UC) that can convert low energy photons to higher energy photons at low excitation intensity. In this study, a macrocyclic parallel dimer of 9,10-diphenylanthracene (DPA) with a precisely parallel orientation, named MPD-2, is synthesized, and its TTA-UC properties are investigated. MPD-2 shows a green-to-blue TTA-UC emission in the presence of a triplet sensitizer, platinum octaethylporphyrin (PtOEP). Compared to monomeric DPA, MPD-2 results in an enhancement of the spin statistical factor of TTA and a decrease in the excitation light intensity due to the intramolecular TTA process. The obtained structure-property relationship provides important information for the further improvement of TTA-UC properties.Precision chemistry539-544https://www.ebi.ac.uk/biostudies/studies/S-EPMC11522992biostudies-literatureTriplet-Triplet Annihilation-Based Photon Upconversion with a Macrocyclic Parallel Dimer.PMC11522992Yanai NMulyadi CHOrihashi KUji MParmar BfalseTriplet-Triplet Annihilation-Based Photon Upconversion with a Macrocyclic Parallel Dimer.The integration of multiple chromophore units into a single molecule is expected to improve the performance of photon upconversion based on triplet-triplet annihilation (TTA-UC) that can convert low energy photons to higher energy photons at low excitation intensity. In this study, a macrocyclic parallel dimer of 9,10-diphenylanthracene (DPA) with a precisely parallel orientation, named MPD-2, is synthesized, and its TTA-UC properties are investigated. MPD-2 shows a green-to-blue TTA-UC emission in the presence of a triplet sensitizer, platinum octaethylporphyrin (PtOEP). Compared to monomeric DPA, MPD-2 results in an enhancement of the spin statistical factor of TTA and a decrease in the excitation light intensity due to the intramolecular TTA process. The obtained structure-property relationship provides important information for the further improvement of TTA-UC properties.2024-01-01T00:00:00Z2024 Oct2025-04-26T17:04:44.586Z2025-04-06T15:25:19.578ZS-EPMC115229923948327010.1021/prechem.4c00050