Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption
Ruthenium(II) picolinate complex, [Ru(dmb)2(pic)]+ (Ru(pic); dmb = 4,4′-dimethyl-2,2′-bipyridine; Hpic = picolinic acid) was newly synthesized as a potential redox photosensitizer with a wider wavelength range of visible-light absorption compared with [Ru(N∧N)3]2+ (N∧N = diimine ligand), which is th...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-05-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fchem.2019.00327/full |
| _version_ | 1811227970140897280 |
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| author | Yusuke Tamaki Kazuma Tokuda Yasuomi Yamazaki Daiki Saito Yutaro Ueda Osamu Ishitani |
| author_facet | Yusuke Tamaki Kazuma Tokuda Yasuomi Yamazaki Daiki Saito Yutaro Ueda Osamu Ishitani |
| author_sort | Yusuke Tamaki |
| collection | DOAJ |
| description | Ruthenium(II) picolinate complex, [Ru(dmb)2(pic)]+ (Ru(pic); dmb = 4,4′-dimethyl-2,2′-bipyridine; Hpic = picolinic acid) was newly synthesized as a potential redox photosensitizer with a wider wavelength range of visible-light absorption compared with [Ru(N∧N)3]2+ (N∧N = diimine ligand), which is the most widely used redox photosensitizer. Based on our investigation of its photophysical and electrochemical properties, Ru(pic) was found to display certain advantageous characteristics of wide-band absorption of visible light (λabs < 670 nm) and stronger reduction ability in a one-electron reduced state (E1/2red = −1.86 V vs. Ag/AgNO3), which should function favorably in photon-absorption and electron transfer to the catalyst, respectively. Performing photocatalysis using Ru(pic) as a redox photosensitizer combined with a Re(I) catalyst reduced CO2 to CO under red-light irradiation (λex > 600 nm). TONCO reached 235 and ΦCO was 8.0%. Under these conditions, [Ru(dmb)3]2+ (Ru(dmb)) is not capable of working as a redox photosensitizer because it does not absorb light at λ > 560 nm. Even in irradiation conditions where both Ru(pic) and Ru(dmb) absorb light (λex > 500 nm), using Ru(pic) demonstrated faster CO formation (TOFCO = 6.7 min−1) and larger TONCO (2347) than Ru(dmb) (TOFCO = 3.6 min−1; TONCO = 2100). These results indicate that Ru(pic) is a superior redox photosensitizer over a wider wavelength range of visible-light absorption. |
| first_indexed | 2024-04-12T09:50:39Z |
| format | Article |
| id | doaj.art-2e219f56989347f382286245f59b7051 |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-04-12T09:50:39Z |
| publishDate | 2019-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-2e219f56989347f382286245f59b70512022-12-22T03:37:50ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462019-05-01710.3389/fchem.2019.00327451349Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band AbsorptionYusuke TamakiKazuma TokudaYasuomi YamazakiDaiki SaitoYutaro UedaOsamu IshitaniRuthenium(II) picolinate complex, [Ru(dmb)2(pic)]+ (Ru(pic); dmb = 4,4′-dimethyl-2,2′-bipyridine; Hpic = picolinic acid) was newly synthesized as a potential redox photosensitizer with a wider wavelength range of visible-light absorption compared with [Ru(N∧N)3]2+ (N∧N = diimine ligand), which is the most widely used redox photosensitizer. Based on our investigation of its photophysical and electrochemical properties, Ru(pic) was found to display certain advantageous characteristics of wide-band absorption of visible light (λabs < 670 nm) and stronger reduction ability in a one-electron reduced state (E1/2red = −1.86 V vs. Ag/AgNO3), which should function favorably in photon-absorption and electron transfer to the catalyst, respectively. Performing photocatalysis using Ru(pic) as a redox photosensitizer combined with a Re(I) catalyst reduced CO2 to CO under red-light irradiation (λex > 600 nm). TONCO reached 235 and ΦCO was 8.0%. Under these conditions, [Ru(dmb)3]2+ (Ru(dmb)) is not capable of working as a redox photosensitizer because it does not absorb light at λ > 560 nm. Even in irradiation conditions where both Ru(pic) and Ru(dmb) absorb light (λex > 500 nm), using Ru(pic) demonstrated faster CO formation (TOFCO = 6.7 min−1) and larger TONCO (2347) than Ru(dmb) (TOFCO = 3.6 min−1; TONCO = 2100). These results indicate that Ru(pic) is a superior redox photosensitizer over a wider wavelength range of visible-light absorption.https://www.frontiersin.org/article/10.3389/fchem.2019.00327/fullredox photosensitizerCO2 reductionphotocatalystRuthenium(II) complexwide-band absorption |
| spellingShingle | Yusuke Tamaki Kazuma Tokuda Yasuomi Yamazaki Daiki Saito Yutaro Ueda Osamu Ishitani Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption Frontiers in Chemistry redox photosensitizer CO2 reduction photocatalyst Ruthenium(II) complex wide-band absorption |
| title | Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption |
| title_full | Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption |
| title_fullStr | Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption |
| title_full_unstemmed | Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption |
| title_short | Ruthenium Picolinate Complex as a Redox Photosensitizer With Wide-Band Absorption |
| title_sort | ruthenium picolinate complex as a redox photosensitizer with wide band absorption |
| topic | redox photosensitizer CO2 reduction photocatalyst Ruthenium(II) complex wide-band absorption |
| url | https://www.frontiersin.org/article/10.3389/fchem.2019.00327/full |
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