Redox-Responsive Molecular Switch for Intramolecular Energy Transfer

Otsuki, Joe; Tsujino, Masayuki; Iizaki, Takeshi; Araki, Koji; Senō, Manabu; Takatera, Kikuo; Watanabe, Tadashi

doi:10.1021/ja970386m

Cited by 81 publications

(66 citation statements)

References 16 publications

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“…Research in the field of photoinduced energy and electron transfer using supramolecular model compounds is fueled by the increasing interest of chemists in charge-separation devices, [1] light-harvesting species, [2] optoelectronics [3] and photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…A plethora of bridging ligands containing identical anchoring sites has been developed for this purpose. [7] More recently, the idea of using [Ru(bpy) 3 ] 2 + as photosensitiser to develop new photocatalysts emerged. An archetypal system is a [Ru(bpy) 3 ] 2 + complex covalently linked to a transition metal complex which can be reduced (or oxidised) following a reductive (oxidative) quenching pathway of the 3 MLCT state of the photosensitiser.…”

Section: Introductionmentioning

confidence: 99%

“…[7] More recently, the idea of using [Ru(bpy) 3 ] 2 + as photosensitiser to develop new photocatalysts emerged. An archetypal system is a [Ru(bpy) 3 ] 2 + complex covalently linked to a transition metal complex which can be reduced (or oxidised) following a reductive (oxidative) quenching pathway of the 3 MLCT state of the photosensitiser. [8] Electron transfer in these supramolecular systems is realised in a similar fashion as in noncovalently attached bimolecular systems, that is, by addition of exogenous electron donors or acceptors.…”

Section: Introductionmentioning

confidence: 99%

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Heteroditopic Ligand Accommodating a Fused Phenanthroline and a Schiff Base Cavity as Molecular Spacer in the Study of Electron and Energy Transfer

Pellegrin

Quaranta

Dorlet

et al. 2005

Chemistry A European J

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The synthesis and characterisation of the heteroditopic ligand N,N'-bis(3,5-di-tert-butylsalicylidene)-5,6-(1,10-phenanthroline)diamine (DPSalH(2)) bearing a phenanthroline and a bis(salicylidene)diimine cavity are reported. This versatile ligand combines two of the most widely used ligands in coordination chemistry. Sequential metallation of the phenanthroline end with Ru(II) and the salophenic cavity with Cu(II) is described. Electrochemical behaviour of the supramolecular complexes [Ru(bpy)(2)(DPSalH(2))](2+) and [Ru(bpy)(2)(DPSalCu)](2+) are analysed in connection with UV/Vis and EPR spectroscopy. The data for the one-electron-reduced species and the singly oxidised species of the binuclear Ru(II)-Cu(II) complex confirmed the formation of metalloradical complexes. Density functional calculations on the free ligand and the copper-only complex indicate in both cases that the HOMOs and LUMOs are developed on the Schiff base cavity with minor contributions on the bipyridine end. These findings support a bichromophoric character for our ruthenium complexes in the ground state, a necessary condition in the design of supramolecular systems for the study of electron transfer. Photophysical studies indicate fast quenching of the triplet excited state in both complexes, which suggests strong intercomponent excited-state interactions. Evidence is presented that this quenching is due to intramolecular electron transfer, at least in the case of [Ru(bpy)(2)(DPSalH(2))](2+), for which a charge-separated state with a remarkable lifetime of about 30 mus was observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heteroditopic Ligand Accommodating a Fused Phenanthroline and a Schiff Base Cavity as Molecular Spacer in the Study of Electron and Energy Transfer

Pellegrin

Quaranta

Dorlet

et al. 2005

Chemistry A European J

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“…9 was recently synthesized by using azo-containing bridging ligand and photoinduced energy transfer from the Ru(II) center to the Os(II) center through the bridging ligand was controlled by redox-switching of the azo group. 17 Also, as shown in Fig. 9, dinuclear Ru(II) complex 28 with aryl/heterocyclic diazo 2,4-pentanediones as a azo-containing bridging ligand was synthesized and antibacterial activity of the complex evaluated against Pseudomonas aeruginosa has been correlated with the change in the absorbances in the presence and absence of the buffered aqueous solution of calf thymus DNA.…”

Section: +mentioning

confidence: 99%

Molecular Wire World Having Metal Complexes

Choi¹

2014

Rapid Communication in Photoscience

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ABSTRACT:Development of molecular and supramolecular systems showing efficient photoinduced energy or electron transfer are of current research interest due to their applications in various chemical and biological processes. Various polypyridine metal complexes including Ru(II), Ru(III), Os(II), Pt(II), Fe(II), Re(I), Ir(III) and so on as a metal center introduce for expanding some more understanding of molecular-scale photoelectronics. Their complexes are concisely classified by the types of relay ligands as follows; (a) metal-direct ligand-metal system; dinuclear or trinuclear systems, (b) metal-nonconjugated ligand-metal system and metal-nonconjugated ligand system having flexible/rigid ligand, (c) metal-conjugated ligandmetal system, and (d) conjugated ligand-metal-conjugated ligand system and metal-self assembly ligand-metal system. It is pointed out that the role played by the relay ligands is important in constructing the metal complexes.

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“…Recently Otsuki et al [15] presented a means for electroswitching the emission of a bis-Ru II complex by reducing the azo linker connecting the two metal centers. Polynuclear metal complexes have also been investigated as potential components of such molecular devices [16±23] because of their electron-and energy-transfer properties.…”

Section: Introductionmentioning

confidence: 99%