Gold Tris(carboxyphenyl)corroles as Multifunctional Materials: Room Temperature Near-IR Phosphorescence and Applications to Photodynamic Therapy and Dye-Sensitized Solar Cells
This research was supported by FRINATEK grant 231086 of the Research Council of Norway (A.G., A.B.A.), the Cancer Research Foundation of St. Olav’s Hospital (Trondheim, Norway; O.A.G.), a U.S. Department of Energy Office of Science Graduate Fellowship Program (DOE SCGF; A.B.R.), the Oregon Nanoscience and Microtechnologies Institute (ONAMI), grant CHE-0911186 of the US National Science Foundation (C.C.W.) and the grants EB018464 and 1R24NS092986-01 from the US National Institiutes of Health (S.A.V.).
ACS Applied Materials & Interfaces
Two amphiphilic corroles—5,10,15-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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Alemayehu, A. B., Day, N. U., Mani, T., Rudine, A. B., Thomas, K. E., Gederaas, O. A., & ... Ghosh, A. (2016). Gold Tris(carboxyphenyl)corroles as Multifunctional Materials: Room Temperature Near-IR Phosphorescence and Applications to Photodynamic Therapy and Dye-Sensitized Solar Cells. ACS Applied Materials & Interfaces, 8(29), 18935-18942.