Supramolecular dendrimers with a [Ru(bpy)3]2+ core and naphthyl peripheral units

Plevoets, Marcus; Vögtle, Fritz; Cola, Luisa De; Balzani, Vincenzo

doi:10.1039/a807619g

Cited by 131 publications

(82 citation statements)

References 23 publications

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“…It should also be noted that in aerated solution the luminescence intensity of the dendrimer core is more than twice as intense as that of the [Ru(bpy) 3 ] 2þ parent compound because the dendrimer branches protect the Ru-bpy based core from dioxygen quenching [50]. In conclusion, because of the very high absorbance of the naphthyl groups in the UV spectral region, the high energy-transfer efficiency and the strong emission of the [Ru(bpy) 3 ] 2þ -type core, dendrimer 16 2þ (Figure 1.14) exhibits a strong visible emission upon UV excitation even in very dilute (10 À7 mol L À1 ) solutions [48].…”

Section: Light-harvesting Antennas J17mentioning

confidence: 99%

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Artificial Photochemical Devices and Machines

Balzani

Venturi

2008

Organic Nanostructures

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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.

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Section: Light-harvesting Antennas J17mentioning

confidence: 99%

“…Dendrimer 16 2þ (Figure 1.14) is a classical example of antenna system [48]. The 2,2 0 -bipyridine ligands of the [Ru(bpy) 3 ] 2þ -type [49] core carry branches containing 1,2-dimethoxybenzene-and 2-naphthyl-type chromophoric units.…”

Section: Light-harvesting Antennas J17mentioning

confidence: 99%

Artificial Photochemical Devices and Machines

Balzani

Venturi

2008

Organic Nanostructures

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“…[66][67][68][69][70][71][72][73][74][75][76][77] Because of their key role, energy transfer processes have been extensively studied for a number of systems. For instance, Lehn and co-workers.…”

Section: Vectorial Energy Transfer and Antenna Effectmentioning

confidence: 99%

Molecular Materials and Devices: Developing New Functional Systems Based on the Coordination Chemistry Approach

Toma

2004

ChemInform

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Neste limiar da era nanotecnológica, o planejamento molecular dos materiais e os estudos de moléculas isoladas estão abrindo imensas possibilidades no emprego de sistemas moleculares em dispositivos eletrônicos e fotônicos, bem como em aplicações tecnológicas baseadas em propriedades de chaveamento ou reconhecimento molecular. Com esse escopo, os químicos inorgânicos em particular, podem aplicar com vantagens as estratégias proporcionadas pela química de coordenação, para construir nanomateriais funcionais que permitam a exploração das propriedades dos centros metálicos e das características dos ligantes presentes. A química de coordenação também oferece recursos eficientes na auto-montagem de nanoestruturas, baseadas na especificidade da interação metal-ligante e nas características estereoquímicas dos complexos. Diversos materiais moleculares gerados a partir de compostos inorgânicos e metal-orgânicos são focalizados neste artigo, com ênfase em novas porfirinas e porfirazinas supramoleculares, clusters e complexos metálicos. Tais sistemas também são enfocados sob o ponto de vista de suas aplicações em catálise, sensores e dispositivos moleculares.At the onset of the nanotechnology age, molecular designing of materials and single molecule studies are opening wide possibilities of using molecular systems in electronic and photonic devices, as well as in technological applications based on molecular switching or molecular recognition. In this sense, inorganic chemists are privileged by the possibility of using the basic strategies of coordination chemistry to build up functional supramolecular materials, conveying the remarkable chemical properties of the metal centers and the characteristics of the ancillary ligands. Coordination chemistry also provides effective self-assembly strategies based on specific metal-ligand affinity and stereochemistry. Several molecular based materials, derived from inorganic and metal-organic compounds are focused on this article, with emphasis on new supramolecular porphyrins and porphyrazines, metal-clusters and metal-polyimine complexes. Such systems are also discussed in terms of their applications in catalysis, sensors and molecular devices.

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“…5 Vögtle and Balzani surrounded a [Ru(bpy) 3 ] 2+ core with second generation dendrons containing naphthyl peripheral moieties. 6 7 Over the past thirty years, trivalent lanthanide complexes have been used in many applications such as luminescent probes, 8 lasers, 9,10 and organic light emitting diodes (OLEDs). [11][12][13] Unlike organic dyes and polymers, whose fluorescence or phosphorescence bands are typically broad, lanthanides have narrow width emission bands (<10 nm full width at half maximum).…”

Section: Part Ii: Photophysical and Energy Transfer Properties Introdmentioning

confidence: 99%

“…[3][4][5][6][7] Xu and Moore demonstrated the use of polyphenylacetylene monodendrons to transfer absorbed energy to perylene. 4 Jiang and Aida used energy transfer in dendrimers to facilitate infrared light induced cis-trans isomerization of an azobenzene core.…”

Section: Part Ii: Photophysical and Energy Transfer Properties Introdmentioning

confidence: 99%

Facilitated Energy Transfer in Hierarchically-Ordered Polymers

Prakash¹,

Harper²

2006

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Supramolecular dendrimers with a [Ru(bpy)3]2+ core and naphthyl peripheral units

Cited by 131 publications

References 23 publications

Artificial Photochemical Devices and Machines

Artificial Photochemical Devices and Machines

Molecular Materials and Devices: Developing New Functional Systems Based on the Coordination Chemistry Approach

Facilitated Energy Transfer in Hierarchically-Ordered Polymers

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