Intramolecular electronic energy transfer in rhodamine–azulene bichromophoric molecule

Kuznetz, Olga; Davis, Daly; Salman, Husein; Eichen, Yoav; Speiser, Shammai

doi:10.1016/j.jphotochem.2007.04.020

Cited by 13 publications

(17 citation statements)

References 11 publications

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“…We have previously conducted a full spectroscopic and EET investigation of Rh − Az and of the RhB isocyanate and Az amine chromophores . Absorption spectra of Rh − Az show that the S 0 → S 1 absorption band of the Rh moiety is centered at 545 nm, and the S 0 → S 2 absorption band of the Az one is at 350 nm, with some small contribution from overlap with the S 0 → S 2 absorption band of the Rh moiety.…”

Section: Resultsmentioning

confidence: 99%

“…In an all-optical case, the 3 inputs, at the frequency ω i , as well as the sum out and carry out outputs are optical signals. Several implementations of logic circuits, including full adders, have already been reported at the molecular level. − In conventional computer circuits, a full adder is typically realized by the concatenation of two half adders . While a donor−acceptor could be a candidate for such an implementation of a full adder, we show in this paper, using the support of a kinetic model, that for the particular molecular system under study, a more optimal way is to map directly the photophysics onto a full addition without an intermediate decomposition into two concatenated half adders.…”

Section: Introductionmentioning

confidence: 99%

“…We have suggested that the Rhodamine ( Rh )−Azulene ( Az ) molecular system can be used for implementing a molecular full adder, where the communication between the Rh and Az half adder is by S 1 → S 1 electronic energy transfer (EET) . A model Rh − Az bichromophoric molecule (Figure ) was synthesized, and its spectral features were examined, , as well as the S 1 → S 1 EET process between Rh donor and Az acceptor . A summary of this spectroscopic and EET study is given in subsections II and III below.…”

Section: Introductionmentioning

confidence: 99%

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All Optical Full Adder Based on Intramolecular Electronic Energy Transfer in the Rhodamine−Azulene Bichromophoric System

et al. 2008

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Charge and electronic energy transfer (ET and EET) are well-studied examples whereby different molecules can signal their state from one (the donor, D) to the other (the acceptor, A). The electronic energy transfer from the donor (Rh) to the acceptor (Az) is used to build an all-optical full adder on a newly synthesized bichromophoric molecule Rh−Az. The results are supported and interpreted by a full kinetic simulation. It is found that the optimal design for the implementation of the full adder relies in an essential way on the intramolecular transfer of information from the donor to the acceptor moiety. However, it is not the case that the donor and the acceptor each act as a half adder.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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All Optical Full Adder Based on Intramolecular Electronic Energy Transfer in the Rhodamine−Azulene Bichromophoric System

et al. 2008

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“…To realize an efficient artificial LHS, regularly arranged structures of dyes for transferring excited energy smoothly are necessary. Artificial LHSs using covalently linked systems and dendrimer systems have been reported, and efficient energy transfer reactions have been achieved in such systems. − Although these systems provide interesting insight from a theoretical viewpoint, synthesis and further modifications in such systems is difficult. Use of supramolecular assemblies of dyes in strategies for structuring artificial LHS have been reported recently. − Kobuke et al found that a supramolecular assembly of zinc–porphyrin derivatives could function as an efficient artificial LHS .…”

Section: Introductionmentioning

confidence: 99%

Artificial Light-Harvesting System with Energy Migration Functionality in a Cationic Dye/Inorganic Nanosheet Complex

2015

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We investigated a reaction involving photochemical energy transfer between a cationic xanthene derivative (Flu(D)) and a cationic porphyrin (Por(A)) with an energy migration functionality, which is crucial for efficient lightharvesting on an inorganic nanosheet. Efficient energy transfer from excited Flu(D) to Por(A) took place, and the maximum energy transfer efficiency was 99%. Even under light-harvesting conditions, Por(A) concentration was much less than Flu(D) concentration (Flu(D)/Por(A) concentration ratio = 15), and the energy transfer efficiency was still 80%. Steady-state, timeresolved, anisotropic fluorescence measurements indicate energy migration between Flu(D) molecules. This system has the functionality of a light-harvesting system using a dye and having a large overlap between its absorption and fluorescence spectra. ■ INTRODUCTIONA natural photosynthetic system is mainly composed of a lightharvesting system (LHS) and photosystems I and II (PS I and PS II, respectively). 1−8 The LHS has several important functions in the photosynthetic system, including (i) increasing the range of absorption wavelength, (ii) dissipating excess excitation energy, and (iii) concentrating absorbed photons to PS I and PS II. The LHS of purple bacteria is composed of dye molecules such as carotenoids and bacteriochlorophylls. 9−13 Carotenoids in the LHS absorb energy (450−540 nm) higher than that absorbed by bacteriochlorophylls. The excitation energy of carotenoids is transferred to bacteriochlorophylls. Carotenoids increase the utilizable sunlight energy in the LHS of purple bacteria. Approximately 50% of the energy absorbed by carotenoids dissipates through an internal conversion process, depending on the strength of the light. This reaction is one of the protective mechanisms against excess excitation energy. In purple bacteria, approximately 200 dye molecules that comprise the LHS surround the reaction centers, 1 and the dye molecules in the LHS form a circular array. The excitation energy migrates efficiently in the ring and between rings; thus, the LHS can transfer light energy efficiently and frequently to the PS I and PS II. One of the most important roles of the LHS is concentration of dilute photon flux to enable the photochemical reaction with multielectron conversion. In an artificial multielectron conversion system, electrons or photons must be frequently supplied to catalysts within the lifetime of one of their electron-oxidized or reduced species, because they become unstable and have a short lifetime. This problem is known as the photon-flux-density problem. 4 Thus, construction of artificial LHSs is crucial for the realization of an artificial photosynthetic system that resembles natural photosynthetic systems.To realize an efficient artificial LHS, regularly arranged structures of dyes for transferring excited energy smoothly are necessary. Artificial LHSs using covalently linked systems and dendrimer systems have been reported, and efficient energy transfer reactions have been achieved in such syste...

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“…Many researchers have been paying efforts to construct artificial LHSs from both viewpoints of basic and application researches. Artificial LHSs constructed with covalent bond and non-covalent interactions such as hydrogen and coordination bond have been reported [6][7][8][9][10][11][12]. We have been studying the photo-functionality of the complex composed of dyes and nano-sheets such as clay minerals [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic photochemical energy transfer in clay/porphyrin system prepared by size-matching effect and Langmuir–Blodgett technique

Ohtani

Nishinaka

Hoshino

et al. 2015

Journal of Photochemistry and Photobiology A: Chemistry

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Intramolecular electronic energy transfer in rhodamine–azulene bichromophoric molecule

Cited by 13 publications

References 11 publications

All Optical Full Adder Based on Intramolecular Electronic Energy Transfer in the Rhodamine−Azulene Bichromophoric System

All Optical Full Adder Based on Intramolecular Electronic Energy Transfer in the Rhodamine−Azulene Bichromophoric System

Artificial Light-Harvesting System with Energy Migration Functionality in a Cationic Dye/Inorganic Nanosheet Complex

Anisotropic photochemical energy transfer in clay/porphyrin system prepared by size-matching effect and Langmuir–Blodgett technique

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