Photoinduced electron transfer in donor–bridge–acceptor assemblies: The case of Os(II)-bis(terpyridine)-(bi)pyridinium dyads

Arrigo, Antonino; Santoro, A.; Puntoriero, Fausto; Lainé, Philippe P.; Campagna, Sebastiano

doi:10.1016/j.ccr.2014.09.019

Cited by 42 publications

(29 citation statements)

References 63 publications

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“…Numerous prior studies investigated the distance dependence of electron transfer rates (k ET ) and the role of the intervening medium between the donor and the acceptor. 1 Rigid rod-like donor-bridge-acceptor compounds, [2][3][4][5][6][7][8][9][10][11][12][13] properly folded proteins or DNA equipped with suitable photosensitizers are particularly useful for investigations in which the donor-acceptor distance (r DA ) must be kept constant on the timescale of an electron transfer event. 1,[14][15][16][17] Saturated hydrocarbon bridges or protein backbone typically enable long-range electron transfer via tunneling, 18,19 whereas conjugated bridges or DNA can give rise to hopping.…”

Section: Introductionmentioning

confidence: 99%

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Neumann

Wenger

2018

Inorg. Chem.

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The distance dependences of electron transfer rates (k ET) in three homologous series of donor-bridge-acceptor compounds with reaction free energies (G ET 0) of ca.-1.2,-1.6, and-2.0 eV for thermal charge recombination after initial photoinduced charge-separation were studied by transient absorption spectroscopy. In the series with low driving-force, the distance dependence is normal and k ET decreases upon donoracceptor distance (r DA) elongation. In the two series with higher driving-forces, k ET increases with increasing distance over a certain range. This counter-intuitive behavior can be explained by a weakly distance dependent electronic donor-acceptor coupling (H DA) in combination with an increasing reorganization energy (). Our study shows that highly exergonic electron transfers can have distance dependences that differ drastically from those of the more commonly investigated weakly exergonic reactions.

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Section: Introductionmentioning

confidence: 99%

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Neumann

Wenger

2018

Inorg. Chem.

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“…However, the fluorescence emission intensity of L‐1 and L‐2 enhanced gradually with the addition of increasing concentrations of Al 3+ . It was probably due to the inhibition of the PET process upon complexation of L‐1 and L‐2 with Al 3+ , which made the fluorescence enhanced dramatically (Scheme ) ,. The fluorescence intensity of L‐1 reached saturation at approximately 2.0 equiv.…”

Section: Resultsmentioning

confidence: 99%

Development of Acridine‐Derived “Turn On” Al³⁺ Fluorescent Sensors and Their Imaging in Living Cells

Wang

Yao

et al. 2018

ChemistrySelect

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Two novel highly selective fluorescent sensors L‐1 and L‐2 for the determination of Al3+ ion were synthesized and characterized. The sensors acridine‐4,5‐diylbismethyl(bis(oxy))bis(2,1‐phenylene))bis‐(methylene))bis(azanediyl))bis(3‐phenylpropan‐1‐ol) (L‐1) and 2,2′‐acridine‐4,5‐diylbis(methylene(bis(oxy))bis(2,1‐phenylene))bis‐(methylene))bis(azanediyl))bis(propan‐1‐ol) (L‐2) showed “turn on” fluorescence response in the presence of Al3+ ion in DMSO/tris‐HCl (1:1, v:v, pH=7.2) buffer solution. Other cations viz. Li+, Na+, K+, Mg2+, Ca2+, Fe2+, Co2+, Ni2+, Cd2+, Cu2+, Zn2+, Mn2+, Ba2+, Pb2+, Hg2+, Fe3+ and Eu3+ ions showed no appreciable change in fluorescence spectrum. The detection limits of L‐1 and L‐2 for Al3+ ion were at the parts per billion level. In addition, possible utilization of sensors as bio‐imaging fluorescent sensors to detect Al3+ in human cervical HeLa cells was also investigated by confocal fluorescence microscopy.

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“…9 H ‐Carbazole and its derivatives have been extensively used as electron donating (D) units in π–conjugated small molecules and polymers . On the other hand, 2,2′:6′,2′′‐terpyridine and its derivatives are readily accessible molecules widely used in organic and supramolecular chemistry, due to their electron accepting (A) character and, most remarkably, to the ability of serving as tridentate ligands, also largely used in photoactive polynuclear metal complexes . Moreover, they can be used as proton responsive units in multicomponent arrays …”

Section: Introductionmentioning

confidence: 99%

“…[30,31] On the other hand, 2,2':6',2''-terpyridine and its derivatives are readily accessible molecules widely used in organic and supramolecular chemistry, due to their electron accepting (A) character and, most remarkably, to the ability of serving as tridentate ligands, [32] also largely used in photoactive polynuclear metal complexes. [33][34][35][36] Moreover, they can be used as proton responsive units in multicomponent arrays. [37] Previous studies have shown that 4'-aryl-substituted 2,2':6',2''-terpyridine derivatives (Tpy, Scheme 1) exhibit excellent luminescence properties.…”

Section: Introductionmentioning

confidence: 99%

Carbazole‐Terpyridine Donor‐Acceptor Dyads with Rigid π‐Conjugated Bridges

et al. 2019

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A series of molecules in which 9H‐carbazole (electron donor, D) and 2,2′:6′,2′′‐terpyridine (electron acceptor, A) are connected through rigid π‐conjugated bridges (D‐π‐A systems) have been synthesized and their photophysical properties examined in detail, with the support of DFT calculations. The bridges are made of different sequences of ethynylene, phenylene, and anthracene groups. The synthetic strategies involve condensation of 2‐acetylpyridine with the aromatic aldehyde moiety on different functionalized π‐conjugated bridges and couplings with carbazole derivatives. The system incorporating anthracene in the bridge shows the typical absorption and emission fingerprints of this polycyclic hydrocarbon. The other systems have HOMOs and LUMOs centred, respectively, over the carbazole and the bridge and exhibit solvatochromic charge‐transfer (CT) luminescence with high photoluminescence yield up to 70 %, except when an ethynylene unit is directly attached to the carbazole ring, due to a trans‐bent non‐emissive π–σ* excited state.

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Photoinduced electron transfer in donor–bridge–acceptor assemblies: The case of Os(II)-bis(terpyridine)-(bi)pyridinium dyads

Cited by 42 publications

References 63 publications

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Development of Acridine‐Derived “Turn On” Al³⁺ Fluorescent Sensors and Their Imaging in Living Cells

Carbazole‐Terpyridine Donor‐Acceptor Dyads with Rigid π‐Conjugated Bridges

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Photoinduced electron transfer in donor–bridge–acceptor assemblies: The case of Os(II)-bis(terpyridine)-(bi)pyridinium dyads

Cited by 42 publications

References 63 publications

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Fundamentally Different Distance Dependences of Electron-Transfer Rates for Low and High Driving Forces

Development of Acridine‐Derived “Turn On” Al3+ Fluorescent Sensors and Their Imaging in Living Cells

Carbazole‐Terpyridine Donor‐Acceptor Dyads with Rigid π‐Conjugated Bridges

Contact Info

Product

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About

Development of Acridine‐Derived “Turn On” Al³⁺ Fluorescent Sensors and Their Imaging in Living Cells