Gold Tris(carboxyphenyl)corroles as Multifunctional Materials: Room Temperature Near-IR Phosphorescence and Applications to Photodynamic Therapy and Dye-Sensitized Solar Cells
2016
Alemayehu, Abraham B. | Day, Nicholas U. | Mani, Tomoyasu | Rudine, Alexander B. | Thomas, Kolle E. | Gederaas, Odrun A. | Vinogradov, Sergei A. | Wamser, Carl C. | Ghosh, Abhik
Two amphiphilic corroles5,10,15-tris(3-carboxyphenyl)corrole (H₃[mTCPC]) and 5,10,15-tris(4-carboxyphenyl)corrole (H₃[pTCPC])and their gold complexes have been synthesized, and their photophysical properties and photovoltaic behavior have been investigated. Like other nonpolar gold corroles, Au[mTCPC] and Au[pTCPC] were both found to exhibit room temperature phosphorescence in deoxygenated solutions with quantum yields of ∼0.3% and triplet lifetimes of ∼75 μs. Both compounds exhibited significant activity as dyes in photodynamic therapy experiments and in dye-sensitized solar cells. Upon irradiation at 435 nm, both Au corroles exhibited significant phototoxicity against AY27 rat bladder cancer cells while the free-base corroles proved inactive. Dye-sensitized solar cells constructed using the free bases H₃[mTCPC] and H₃[pTCPC] exhibited low efficiencies (≪1%), well under that obtained with 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin, H₂[pTCPP] (1.9%, cf. N719 9.5%). Likewise, Au[pTCPC] proved inefficient, with an efficiency of ∼0.2%. By contrast, Au[mTCPC] proved remarkably effective, exhibiting an open-circuit voltage (Vₒc) of 0.56 V, a short-circuit current of 8.7 mA cm–², a fill factor of 0.72, and an efficiency of 3.5%.
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