Table 3. Photocatalytic properties of Ru2Re and RuRe2 a .
|
|
Product
b
/μmol (TON) |
Φ CO c /% | Γ CO b , d , % | k q e , 107 M–1 s–1 | η q f % | |||
| CO | HCOOH | H2 | ||||||
| BIH | Ru2Re | 186.5 (2486 ± 12) | 20.2 (269) | 0.01 | 28 ± 0.6 | 90 | 83 ± 0.8 | 99 |
| Ru2Re g | 90.6 (6038 ± 18) | 21.7 (1447) | 0.02 | — | 81 | 83 ± 0.8 | 99 | |
| RuRe2 | 277.4 (1850 ± 10) | 3.3 (22) | ∼0 | 25 ± 0.5 | 99 | 80 ± 2.6 | 99 | |
| RuRe2 h | 157.0 (5232 ± 14) | 5.3 (177) | ∼0 | — | 97 | 80 ± 2.6 | 99 | |
| RuRe i | 110.0 (3657 ± 29) | 1.1 (36) | 0.03 | 30 ± 1.1 | 99 | 120 ± 0.5 | 99 | |
| BNAH | Ru2Re | 17.5 (216 ± 5) | 13.0 (77) | 0.8 | 6.9 ± 0.9 | 56 | 2.0 ± 0.3 | 63 |
| RuRe2 | 33.7 (225 ± 6) | 8.6 (57) | 0.2 | 8.3 ± 1.2 | 79 | 2.2 ± 0.5 | 67 | |
aCO2-saturated DMA–TEOA (5 : 1 v/v) solution containing Ru2Re (25 μM) or RuRe2 (50 μM) and a sacrificial electron donor (0.1 M) was irradiated.
b3 mL solution was irradiated for 20 h using a LED (530 nm, 4 mW) as a light source. TONs are calculated based on the photocatalyst used.
c4 mL solution was irradiated at λex = 480 nm (light intensity: 1 × 10–8 einstein per s).
dThe selectivity for CO production.
eQuenching rate constants for emissions from the photosensitizer unit by a sacrificial electron donor obtained from linear Stern–Volmer plots and their lifetimes.
fQuenching fractions for emissions from the photosensitizer unit by a sacrificial electron donor (0.1 M) calculated as 0.1kqτem/(1 + 0.1kqτem).
g[Ru2Re] = 5 μM, 60 h irradiation.
h[RuRe2] = 10 μM, 60 h irradiation.
i[RuRe] = 10 μM, 60 h irradiation.