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• W2914897140 abstract "The photophysics of selected tungsten iodide clusters was examined with respect to their role as a photosensitizer for the production of singlet oxygen, O2(a1Δg). We examined all-iodo octahedral clusters, [W6I8(I6)]2–, and ligand-substituted octahedral clusters, [W6I8(L6)]2–, in which the ligand, L, occupies the outer apical positions surrounding the cluster core. We also examined a square-pyramidal cluster, [W5I8(I5)]−, in which the tungsten core was presumably more accessible to diffusional encounter with ground state oxygen, O2(X3Σg–). For the compounds examined, we find pronounced cluster-dependent changes in the yield of photosensitized O2(a1Δg) production. In particular, although the iodine-encased octahedral cluster, [W6I8(I6)]2–, is an efficient O2(a1Δg) sensitizer, the pyramidal cluster, [W5I8(I5)]−, does not make O2(a1Δg) at all. The latter provides fundamental insight into the important case where the sensitizer triplet state is nearly degenerate with the O2(X3Σg–)–O2(a1Δg) transition energy at 1 eV. Our data indicate that even with near resonance, energy transfer to form O2(a1Δg) will not occur within the 3sensitizer–O2(X3Σg–) encounter pair if other more efficient channels for energy dissipation are available." @default.
• W2914897140 created "2019-02-21" @default.
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• W2914897140 date "2019-02-13" @default.
• W2914897140 modified "2023-09-26" @default.
• W2914897140 title "Tungsten Iodide Clusters as Singlet Oxygen Photosensitizers: Exploring the Domain of Resonant Energy Transfer at 1 eV" @default.
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• W2914897140 doi "https://doi.org/10.1021/acs.jpca.9b00541" @default.
• W2914897140 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30758957" @default.
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