Photoinduced electronic energy transfer in modular, conjugated, dinuclear Ru(II)/Os(II) complexes

Welter, S.; Salluce, Nunzio; Belser, Peter; Groeneveld, Michiel M.; Cola, Luisa De

doi:10.1016/j.ccr.2004.11.008

Cited by 99 publications

(84 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the system the energy donor, the iridium component, is strongly quenched by the energy acceptor, the ruthenium component, independently of the length of the bridging ligand. In this case, in contrast to the reported [Ru-ph n -Os] 4 + dinuclear donor-acceptor complexes, [41] the involvement of the bridging ligand in the energy-transfer process is dramatic, because of a good orbital-overlap between the donor and the phenylene chain. In the simplified energetic diagram (Figure 8), the iridium excited-state is very close in energy to the polyphenylene bridge levels (even when considering an uncertainty in the values).…”

Section: Photoinduced Energy Transfercontrasting

confidence: 73%

“…[40] We used the dimeric [Ir-(ppyFF) 2 (m-Cl)] 2 precursor containing two fluorinated ppy ligands to prepare the heterodinuclear complexes [Ir-ph n -Ru] The stepwise synthesis of ruthenium complexes containing an oligophenylene bridging ligand with a free terminal bipyri- www.chemphyschem.org dine is based on successive two-step sequences to build up the otherwise almost insoluble bridging ligand. [41,42] The first step involves a Suzuki cross-coupling reaction [43] between a trimethylsilyl-protected aryl boronic acid and a mononuclear ruthenium complex containing an aryl halide. The second step involves the cleavage of the trimethylsilyl group, followed by iodation with ICl at a low temperature.…”

Section: Design and Synthesis Of The Compoundsmentioning

confidence: 99%

See 1 more Smart Citation

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?

et al. 2005

Self Cite

View full text Add to dashboard Cite

The synthesis and electrochemical and photophysical properties of a series of heterodinuclear ruthenium-iridium complexes linked by a modular para-phenylene bridge [Ir-ph(n)-Ru]3+ (Ir=Ir(ppyFF)2bpy, Ru=Ru(bpy)3, ppyFF=2-(2,4-difluorophenyl)pyridine), bpy=2,2'-bipyridine, ph=phenylene, n=2, 3, 4, 5) are reported. The use of a high-energy iridium complex, which can act as an energy donor when coupled to the lower energy ruthenium-based component, allows the investigation of photoinduced energy transfer from the excited iridium-centre to the ruthenium fragment (energy acceptor). The rate constants of the energy-transfer processes are determined by time-resolved emission and sub-picosecond transient absorption spectroscopy. Interestingly, there is almost no decrease in transfer efficiency or rates as the length between the two chromophores (number of spacers) is increased. This "molecular wire" behavior indicates the dominance of the incoherent hopping mechanism, allowing a very fast energy transfer over long distances (with n = 5 the metal-to-metal distance is estimated to be 32.5 Angstrom). This is the first case in which such behavior is observed for metal complexes, and could lead to new development in molecular electronics.

show abstract

Section: Photoinduced Energy Transfercontrasting

confidence: 73%

Section: Design and Synthesis Of The Compoundsmentioning

confidence: 99%

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

“…For comparison, the subpicosecond transient absorption spectra of the two homodinuclear complexes were also recorded (see the Supporting Information), showing characteristic features for these types of systems. [20,24] The analysis of the kinetics of the energytransfer process in the [Ir-Nor-Ru] 3 + system was obtained from the band evolution at 375 nm, which shows that complete quenching of the iridium-centred excited state takes place within the first 150 ps of the measurement (Figure 4 c). A reasonable complementarity is observed in Figure 4 d, which shows a decay of the signal at 600 nm as time proceeds.…”

Section: Resultsmentioning

confidence: 99%

Efficient Photoinduced Energy Transfer Mediated by Aromatic Homoconjugated Bridges

Barcina

Herrero-García

Cucinotta

et al. 2010

Chemistry A European J

View full text Add to dashboard Cite

A new donor-bridge-acceptor (D-B-A) dyad consisting of ruthenium(II) and iridium(III) species separated by an homoconjugated bridge derived from 7,7-diphenylnorbornane [Ir-Nor-Ru](3+) has been synthesised. The photophysical and electrochemical properties of the heterodinuclear complex have been compared with those of the analogous homodinuclear complexes [Ru-Nor-Ru](4+) and [Ir-Nor- Ir](2+) . Transient absorption spectra on the nanosecond and sub-picosecond timescales show, for the first time, that an homoconjugated bridge can mediate efficiently in the photoinduced energy transfer from the iridium(III) to the ruthenium(II) centres according to a Dexter-type mechanism.

show abstract

“…Interesting examples of this type of systems are the [Ru(bpy [27] shown in Figure 1.7. In such compounds, excitation of the [Ru (bpy) 3 ] 2þ moiety is followed by energy transfer to the [Os(bpy) 3 ] 2þ unit, as shown by the sensitized emission of the latter (CH 3 CN, 293 K).…”

Section: Molecular Wires For Photoinduced Energy Transfermentioning

confidence: 99%

Artificial Photochemical Devices and Machines

Balzani

Venturi

2008

Organic Nanostructures

View full text Add to dashboard Cite

The interaction between light and matter lies at the heart of the most important processes of life [1]. Photons are exploited by natural systems as both quanta of energy and elements of information. Light constitutes an energy source and is consumed (or, more precisely, converted) in large amount in the natural photosynthetic process, whereas it plays the role of a signal in vision-related processes, where the energy used to run the operation is biological in nature.A variety of functions can also be obtained from the interaction between light and matter in artificial systems [2]. The type and utility of such functions depend on the degree of complexity and organization of the chemical systems that receive and process the photons.About 20 years ago, in the frame of research on supramolecular chemistry, the idea began to arise [3][4][5] that the concept of macroscopic device and machine can be transferred to the molecular level. In short, a molecular device can be defined [6] as an assembly of a discrete number of molecular components designed to perform a function under appropriate external stimulation. A molecular machine [6-8] is a particular type of device where the function is achieved through the mechanical movements of its molecular components.In analogy with their macroscopic counterparts, molecular devices and machines need energy to operate and signal to communicate with the operator. Light provides an answer to this dual requirement. Indeed, a great number of molecular devices and machines are powered by light-induced processes and light can also be useful to read the state of the system and thus to control and monitor its operation. Before illustrating examples of artificial photochemical molecular devices and machines, it is worthwhile recalling a few basic aspects of the interaction between molecular and supramolecular systems and light. For a more detailed discussion, books [9][10][11][12][13][14][15] can be consulted.

show abstract

Photoinduced electronic energy transfer in modular, conjugated, dinuclear Ru(II)/Os(II) complexes

Cited by 99 publications

References 60 publications

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?

Efficient Photoinduced Energy Transfer Mediated by Aromatic Homoconjugated Bridges

Artificial Photochemical Devices and Machines

Contact Info

Product

Resources

About

Photoinduced electronic energy transfer in modular, conjugated, dinuclear Ru(II)/Os(II) complexes

Cited by 99 publications

References 60 publications

Energy Transfer by a Hopping Mechanism in Dinuclear IrIII/RuII Complexes: A Molecular Wire?

Energy Transfer by a Hopping Mechanism in Dinuclear IrIII/RuII Complexes: A Molecular Wire?

Efficient Photoinduced Energy Transfer Mediated by Aromatic Homoconjugated Bridges

Artificial Photochemical Devices and Machines

Contact Info

Product

Resources

About

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?

Energy Transfer by a Hopping Mechanism in Dinuclear Ir^III/Ru^II Complexes: A Molecular Wire?