Unconventional Nonlinear Input–Output Response in a Luminescent Molecular Switch by Inner Filtering Effects

Baroncini, Massimo; Semeraro, Monica

doi:10.1002/cphc.201700046

Cited by 5 publications

(4 citation statements)

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“…Two key problems to be overcome in this regard are input-output homogeneity [39c] and the amplification of outputs. [44] Input-output (in)homogeneity describes whether or not the output of a molecular logic operation is of the same physical form as the input, which is an important requirement for linking logic devices together. For example, a binary AND gate that takes H + and Zn 2+ ions as inputs and switches on blue fluorescence as an output cannot be linked to another such AND gate without a mechanism of transforming blue light into an increase in H + and/or Zn 2+ ion concentration.…”

Section: Molecular Logic and Computingmentioning

confidence: 99%

7. Controlling molecular motion

2020

Supramolecular Chemistry

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I hereby declare that this submission is my own work and to the best of my knowledge it contains no materials previously published or written by another person, or substantial proportions of material which have been accepted for the award of any other degree or diploma at UNSW or any other educational institution, except where due acknowledgement is made in the thesis. Any contribution made to the research by others, with whom I have worked at UNSW or elsewhere, is explicitly acknowledged in the thesis.I also declare that the intellectual content of this thesis is the product of my own work, except to the extent that assistance from others in the project's design and conception or in style, presentation and linguistic expression is acknowledged.

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Section: Molecular Logic and Computingmentioning

confidence: 99%

7. Controlling molecular motion

2020

Supramolecular Chemistry

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“…Such changes can be related to the operation of fluorescence chemosensors, molecular switches, and logic gates (via the familiar Boolean logic where the modulators correspond to the inputs and the observed changes correspond to the outputs) . As a consequence, the field of molecular logic gates and generally of chemosensors and molecular switches is very active and many research groups around the world work on these subjects …”

Section: Introductionmentioning

confidence: 99%

The solvent effect on a styryl‐bodipy derivative functioning as an AND molecular logic gate

Tzeli

Petsalakis

Theodorakopoulos

2020

Int J of Quantum Chemistry

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We study via DFT and TDDFT calculations the photophysical processes of a styrylbodipy derivative, (1), of its monometallic complexes 1-M 2+ (M = Ca, Zn, and Hg), and its trimetallic complex (2) unprotonated, protonated and complexed with water molecules in water solvent and in acidic conditions. The main targets of this study are to gain information regarding published reports on fluorophore species mentioning that fluorescent switching results from trace water, to study how 1 behaves in water solvent which is a common used solvent for molecular logic gates (MLG), and how it behaves in acidic conditions. We conclude that in water solvent, as in acetonitrile solvent (which was found before both theoretically and experimentally) there will be a quenching of emission spectra in 1 and 1-M 2+ and a retaining of emission in 2. However, contrary to acetonitrile solvent, in water, a weak peak will be observed for 1 and 1-M 2+ , due to a small ratio of reversible protonation, showing that in acetonitrile 1 acts as a better MLG candidate than in water solvent. On the other hand, in acidic conditions all five species will emit and as a result, 1 will not be an AND MLG, showing that the selection of the solvent conditions is crucial for a species to act as an MLG candidate. Finally, we conclude that the retaining of emission is accomplished by the simultaneous tetrahedral geometry of all three aniline N atoms.charge-transfer, DFT calculations, molecular logic gate, spectra, styryl-bodipy | INTRODUCTIONFluorescence chemosensors and molecular switches present applications in diverse sciences, such as chemistry, electronics, materials, and medicine. [1][2][3][4] Molecules respond to changes in their environment, such as changes of pH, temperature, solvent, viscosity, the presence of various ions, of neutral species, and so on. [1][2][3][4][5][6][7][8][9][10][11][12] As a result, in response to these modulations, molecules can exhibit differences in their ground or excited electronic states, with accompanying modifications in the absorption and/or emission intensity and wavelength. Such changes can be related to the operation of fluorescence chemosensors, molecular switches, and logic gates (via the familiar Boolean logic where the modulators correspond to the inputs and the observed changes correspond to the outputs). [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] As a consequence, the field of molecular logic gates and generally of chemosensors and molecular switches is very active and many research groups around the world work on these subjects. The majority of fluorescence chemosensors and molecular switches are based on the "on-off" or "off-on" response of photoinduced electron transfer (PET), [36][37][38] because PET produces very sharp changes in the signal intensity and it can be modulated in such a way as to generate significant changes in the emission wavelengths. The impact of PET on UV-vis absorption is often negligible and other effects, such as intramolecular charge transfer (ICT) could affect ...

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“…Two key requirements can be identified for molecular devices that can be assembled into arbitrarily larger systems: input−output homogeneity 5,18 and constant signal amplitude. 19 Input−output homogeneity refers to the use of a single information basis (e.g., photons or electrons) for both logical inputs and outputs.…”

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confidence: 99%

“…Previous reports of molecular logic used chemical stimuli or light as inputs and/or outputs for molecular devices − such as Boolean logic gates, − multiplexers and demultiplexers, or memory components capable of storing and retrieving information. , Despite successes in creating individual molecular devices, little progress has been made toward cascading multiple devices into more complex systems, and molecular computing remains a distant prospect. Two key requirements can be identified for molecular devices that can be assembled into arbitrarily larger systems: input–output homogeneity , and constant signal amplitude . Input–output homogeneity refers to the use of a single information basis (e.g., photons or electrons) for both logical inputs and outputs.…”

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confidence: 99%

An All-Photonic Molecular Amplifier and Binary Flip-flop

MacDonald

Schmidt

Beves

2021

J. Phys. Chem. Lett.

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A chemical system is proposed that is capable of amplifying small optical inputs into large changes in internal composition, based on a feedback interaction between switchable fluorescence and visible-light photoswitching. This system would demonstrate bifurcating reaction kinetics under irradiation and reach one of two stable photostationary states depending on the initial composition of the system. This behavior would allow the system to act as a chemical realization of the flip-flop circuit, the fundamental element in sequential logic and binary memory storage. We use detailed numerical modeling to demonstrate the feasibility of the proposed behavior based on known molecular phenomena, and comment on some of the conditions required to realize this system. File list (2)download file view on ChemRxiv amplifier.pdf (871.72 KiB) download file view on ChemRxiv TOC.pdf (400.35 KiB)

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Unconventional Nonlinear Input–Output Response in a Luminescent Molecular Switch by Inner Filtering Effects

Cited by 5 publications

References 76 publications

7. Controlling molecular motion

7. Controlling molecular motion

The solvent effect on a styryl‐bodipy derivative functioning as an AND molecular logic gate

An All-Photonic Molecular Amplifier and Binary Flip-flop

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