Ru(II)-bipyridine complexes in supramolecular systems, devices and machines

Balzani, Vincenzo; Bergamini, Giacomo; Marchioni, Filippo; Ceroni, Paola

doi:10.1016/j.ccr.2005.11.013

Cited by 267 publications

(177 citation statements)

References 47 publications

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“…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. Because such units (as well as the core) are separated by aliphatic connections, the interchromophoric interactions are weak and the absorption spectrum of the dendrimer is substantially equal to the summation of the spectra of the chromophoric groups that are present in its structures.…”

Section: Light-harvesting Antennas J17mentioning

confidence: 99%

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%

Artificial Photochemical Devices and Machines

Balzani

Venturi

2008

Organic Nanostructures

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“…The amide functionality exhibits a dual complexating feature (C=O and N or NH), thus meaning that amide-based molecular receptors can bind metal, neutral molecules and organic cations and anions as well. 2 Some of them are used as biologically interacting substrates 3 and their optically active forms are applied to chiral recognition processes. 4 There are a number of macrocycles which in addition to amide functional groups contain other elements and/or heteroaromatic rings.…”

Section: Introductionmentioning

confidence: 99%

A first approach to 2,2’-bipyridine thiacrown ethers containing bisamide groups

Branowska¹,

Ławecka²,

Wysocki³

et al. 2009

Arkivoc

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“…The lowest excited state in the previously studied system % & was the acceptor localised triplet state, 3 NAP. Changing the electron acceptor from NAP to NDI considerably decreases the reduction potential of the acceptor and therefore the energy of the charge$separated state, whereas the NDI triplet state is higher in energy (2.1 eV vs. 1.9 eV for 3 NAP), 50 thus the lowest excited state in "PTZ$Pt$NDI" assemblies is expected to be a charge$separated state.…”

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“…From this transient state, reductive and oxidative equivalents may be transferred to reactants in the generation of solar fuels, or electrons may be injected into the conduction band at a semiconductor interface. 3,4 One strategy which may be adopted in the construction of a charge transfer assembly is the so$called 'modular approach' where several functional units are integrated within one supramolecular architecture. 5,2 These systems comprise electron$donating and $accepting groups, covalently linked together through an intermediate bridge, forming a donor$bridge$ acceptor (DBA) molecular assembly.…”

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confidence: 99%