Dual role of para-phenyl substituents in aromatic imine ligand complexes of cobalt and iron

RAO, J. M.; Macero, Daniel J.; Hughes, Michael C.

doi:10.1016/s0020-1693(00)88458-3

Cited by 30 publications

(5 citation statements)

References 24 publications

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“…The relatively strong bands at 587, 574, and 572 nm are assigned as metal-to-ligand charge transfer (MLCT) (Fe II to terpyridine ligands) transitions of Fe(Ntpy) 2 , Fe(Cltpy) 2 , and Fe(Htpy) 2 , respectively. The MLCT transitions around 580 nm are similar to other reported bis (terpyridine)iron(II) complexes. ,,− …”

Section: Results and Discussionsupporting

confidence: 84%

Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

et al. 2021

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Photocatalytic CO 2 reduction reaction is believed to be a promising approach for CO 2 utilization. In this work, a noble metal-free photocatalytic system, composed of bis(terpyridine)iron(II) complexes and an organic thermally activated delayed fluorescence compound, has been developed for selective reduction of CO 2 to CO with a maximum turnover number up to 6320, 99.4% selectivity, and turnover frequency of 127 min −1 under visible−light irradiation in dimethylformamide/H 2 O solution. More than 0.3 mmol CO was generated using 0.05 μmol catalyst after 2 h of light irradiation. The apparent quantum yield was found to be 9.5% at 440 nm (180 mW cm −2 ). Control experiments and UV−vis−NIR spectroscopy studies further demonstrated that water strongly promoted the photocatalytic cycle and terpyridine ligands rather than Fe(II) were initially reduced during the photocatalytic process.

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Section: Results and Discussionsupporting

confidence: 84%

Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

et al. 2021

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“…Data for [M(tpy) 2 ]-[PF 6 ] 2 and [M(phtpy) 2 ][PF 6 ] 2 complexes are also shown for comparison. 40,42,43 As observed in the electrochemistry, the energy of the ligand π* is lowered with respect to terpyridine in the more conjugated biptpy ligand. Consequently, the MLCT bands of these biptpy complexes are shifted to higher wavelength when compared to the corresponding tpy complexes.…”

Section: Solution Behaviourmentioning

confidence: 78%

Red and blue luminescent metallo-supramolecular coordination polymers assembled through π–π interactions †

Alcock

Barker

Haider

et al. 2000

J. Chem. Soc., Dalton Trans.

223

140

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“…Each of the CTP complexes displayed reductions associated with ligands and a reversible metal-based oxidation (Fe II /Fe III ) with an E 1/2 of 0.854 V for 1a and 1b and 0.940 V for 2a and 2b (see Table 2). Compared to the unsubstituted analogues ([Fe(Terpy) 2 ](PF 6 ) 2 (E 1/2ox = 0.770 V) 42 and [Fe(PhTerpy) 2 ](ClO 4 ) 2 (E 1/2ox 1.105 V) 43,44 respectively), the oxidation potentials of 1a and 1b show a cathodic shift due to the electron-withdrawing effects of the phosphazene ether group. However, 2a and 2b have an anodic shift due to the phenyl spacer acting as an electron-donating group and isolating the FeTerpy unit from the effects of the phosphazene ether group.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Toward an Iron(II) Spin-Crossover Grafted Phosphazene Polymer

et al. 2012

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Two new cyclotriphosphazene ligands with pendant 2,2':6',2″-terpyridine (Terpy) moieties, namely, (pentaphenoxy){4-[2,6-bis(2-pyridyl)]pyridoxy}cyclotriphosphazene (L(1)), (pentaphenoxy){4-[2,6-terpyridin-4-yl]phenoxy}cyclotriphosphazene (L(2)), and their respective polymeric analogues, L(1P) and L(2P), were synthesized. These ligands were used to form iron(II) complexes with an Fe(II)Terpy(2) core. Variable-temperature resonance Raman, UV-visible, and Mössbauer spectroscopies with magnetic measurements aided by density functional theory calculations were used to understand the physical characteristics of the complexes. By a comparison of measurements, the polymers were shown to behave in the same way as the cyclotriphosphazene analogues. The results showed that spin crossover (SCO) can be induced to start at high temperatures by extending the spacer length of the ligand to that in L(2) and L(2P); this combination provides a route to forming a malleable SCO material.

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Dual role of para-phenyl substituents in aromatic imine ligand complexes of cobalt and iron

Cited by 30 publications

References 24 publications

Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Red and blue luminescent metallo-supramolecular coordination polymers assembled through π–π interactions †

Toward an Iron(II) Spin-Crossover Grafted Phosphazene Polymer

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Dual role of para-phenyl substituents in aromatic imine ligand complexes of cobalt and iron

Cited by 30 publications

References 24 publications

Water-Assisted Highly Efficient Photocatalytic Reduction of CO2 to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Water-Assisted Highly Efficient Photocatalytic Reduction of CO2 to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Red and blue luminescent metallo-supramolecular coordination polymers assembled through π–π interactions †

Toward an Iron(II) Spin-Crossover Grafted Phosphazene Polymer

Contact Info

Product

Resources

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Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer

Water-Assisted Highly Efficient Photocatalytic Reduction of CO₂ to CO with Noble Metal-Free Bis(terpyridine)iron(II) Complexes and an Organic Photosensitizer