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• W1963571037 abstract "Kinetically inert cationic Ni(II)TMPyP4 + (H2TMPyP4 + = 5,10,15,20-tetrakis(methylpyridinium-4-yl)porphyrin) displayed a characteristic fluorescence (τ = 1.2–1.4 ns, Φ = 2.0 × 10− 3), which was quenched with triethanolamine (TEOA) in a static way. This complex proved to be an efficient photocatalyst in the system containing TEOA and methylviologen (MV2 +) as electron donor and acceptor, respectively. Interestingly, however, deviating from the behavior of the analogous Co(III) and Mn(III) complexes in such a system, TEOA did not dynamically quench the triplet excited state of Ni(II)TMPyP4 + (τ = 6.31 μs), hence no reduction of the metal center occured upon irradiation. Instead, in the presence of this electron donor (at 1 × 10− 3 M) the excited-state lifetime dramatically increased (to τ = 36.6 μs), indicating the formation of a Ni(II)TMPyP4 +-TEOA associate. This longer-lived triplet was efficiently quenched by MV2 + (kq = 9.9 × 106 M− 1 s− 1), leading to the formation of MV•+. The overall quantum yield of this one-step photoassisted electron transfer is considerably high (Φ = 0.011–0.013 at Soret-band irradiation). Hence, this system, combined with a suitable co-catalyst, may be applicable for visible light-driven hydrogen generation from water." @default.
• W1963571037 created "2016-06-24" @default.
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• W1963571037 date "2016-11-01" @default.
• W1963571037 modified "2023-09-26" @default.
• W1963571037 title "Photophysical and photocatalytic behavior of nickel(II) 5,10,15,20-tetrakis(1-methylpyridinium-4-yl)porphyrin" @default.
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• W1963571037 doi "https://doi.org/10.1016/j.inoche.2016.09.001" @default.
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