Unsymmetrical dirhodium single molecule photocatalysts for H2 production with low energy light

2021 ◽  
Vol 57 (16) ◽  
pp. 2061-2064
Author(s):  
Agustin Millet ◽  
Congcong Xue ◽  
Claudia Turro ◽  
Kim R. Dunbar
Keyword(s):  
Single Molecule ◽  
Red Light ◽  
H2 Production ◽  
Low Energy ◽  
Dirhodium Complexes

New unsymmetrical dirhodium complexes for photocatalytic H2 production with red light.

scholarly journals Panchromatic dirhodium photocatalysts for dihydrogen generation with red light

2020 ◽  
Vol 11 (36) ◽  
pp. 9775-9783
Author(s):  
Jie Huang ◽  
Judith C. Gallucci ◽  
Claudia Turro
Keyword(s):  
Single Molecule ◽  
Red Light ◽  
Dirhodium Complexes

Three dirhodium complexes cis-[Rh2(DPhB)2(bncn)2](BF4)2, cis-[Rh2(DPhTA)2(bncn)2](BF4)2 and cis-[Rh2(DPhF)2(bncn)2](BF4)2 are shown to act as single-molecule photocatalysts for H2 production.

scholarly journals Low energy dissipation readout of single-molecule ferroelectronic states by a spin-Seebeck signal

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Hua-Hua Fu ◽  
Dan-Dan Wu ◽  
Gui-Fang Du ◽  
Qing-Bo Liu ◽  
Menghao Wu
Keyword(s):  
Energy Dissipation ◽  
Single Molecule ◽  
Low Energy

scholarly journals Excitation energy-dependent photocurrent switching in a single-molecule photodiode

2019 ◽  
Vol 116 (33) ◽  
pp. 16198-16203 ◽  
Author(s):  
Bing Shan ◽  
Animesh Nayak ◽  
Olivia F. Williams ◽  
Dillon C. Yost ◽  
Nicholas F. Polizzi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Indium Tin Oxide ◽  
Flash Photolysis ◽  
Theoretical Calculations ◽  
Electron Flow ◽  
Red Light ◽  
Excitation Frequency ◽  
Frequency Dependent ◽  
Oxide Electrodes

The direction of electron flow in molecular optoelectronic devices is dictated by charge transfer between a molecular excited state and an underlying conductor or semiconductor. For those devices, controlling the direction and reversibility of electron flow is a major challenge. We describe here a single-molecule photodiode. It is based on an internally conjugated, bichromophoric dyad with chemically linked (porphyrinato)zinc(II) and bis(terpyridyl)ruthenium(II) groups. On nanocrystalline, degenerately doped indium tin oxide electrodes, the dyad exhibits distinct frequency-dependent, charge-transfer characters. Variations in the light source between red-light (∼1.9 eV) and blue-light (∼2.7 eV) excitation for the integrated photodiode result in switching of photocurrents between cathodic and anodic. The origin of the excitation frequency-dependent photocurrents lies in the electronic structure of the chromophore excited states, as shown by the results of theoretical calculations, laser flash photolysis, and steady-state spectrophotometric measurements.

scholarly journals Triplet–triplet annihilation upconversion followed by FRET for the red light activation of a photodissociative ruthenium complex in liposomes

2015 ◽  
Vol 17 (41) ◽  
pp. 27380-27390 ◽  
Author(s):  
Sven H. C. Askes ◽  
Miroslav Kloz ◽  
Gilles Bruylants ◽  
John T. M. Kennis ◽  
Sylvestre Bonnet
Keyword(s):  
Lipid Bilayer ◽  
Ruthenium Complex ◽  
Red Light ◽  
High Energy ◽  
Low Energy ◽  
Light Activation ◽  
Triplet Triplet Annihilation

Three molecules in a single lipid bilayer to trigger high-energy photochemistry with low-energy photons.

scholarly journals Imaging proteins at the single-molecule level

2017 ◽  
Vol 114 (7) ◽  
pp. 1474-1479 ◽  
Author(s):  
Jean-Nicolas Longchamp ◽  
Stephan Rauschenbach ◽  
Sabine Abb ◽  
Conrad Escher ◽  
Tatiana Latychevskaia ◽  
...  
Keyword(s):  
Single Molecule ◽  
Protein Complexes ◽  
Ion Beam ◽  
Low Energy ◽  
Electron Holography ◽  
Soft Landing ◽  
Single Molecule Level ◽  
Low Energy Electrons ◽  
Molecular Nanotechnology ◽  
Beam Deposition

Imaging single proteins has been a long-standing ambition for advancing various fields in natural science, as for instance structural biology, biophysics, and molecular nanotechnology. In particular, revealing the distinct conformations of an individual protein is of utmost importance. Here, we show the imaging of individual proteins and protein complexes by low-energy electron holography. Samples of individual proteins and protein complexes on ultraclean freestanding graphene were prepared by soft-landing electrospray ion beam deposition, which allows chemical- and conformational-specific selection and gentle deposition. Low-energy electrons do not induce radiation damage, which enables acquiring subnanometer resolution images of individual proteins (cytochrome C and BSA) as well as of protein complexes (hemoglobin), which are not the result of an averaging process.

scholarly journals Trifluoroethoxy-Coated Subphthalocyanine affects Trifluoromethylation of Alkenes and Alkynes even under Low-Energy Red-Light Irradiation

ChemistryOpen ◽  
2017 ◽  
Vol 6 (2) ◽  
pp. 226-230 ◽  
Author(s):  
Kohei Matsuzaki ◽  
Tomoya Hiromura ◽  
Etsuko Tokunaga ◽  
Norio Shibata
Keyword(s):  
Red Light ◽  
Low Energy ◽  
Light Irradiation

scholarly journals PMMA-Assisted Plasma Patterning of Graphene

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Alfredo D. Bobadilla ◽  
Leonidas E. Ocola ◽  
Anirudha V. Sumant ◽  
Michael Kaminski ◽  
Jorge M. Seminario
Keyword(s):  
Single Molecule ◽  
Oxygen Plasma ◽  
2D Materials ◽  
High Energy ◽  
Low Energy ◽  
Graphene Ribbon ◽  
Microelectronic Fabrication ◽  
Time Required ◽  
Transistor Fabrication ◽  
Energy Processes

Microelectronic fabrication of Si typically involves high-temperature or high-energy processes. For instance, wafer fabrication, transistor fabrication, and silicidation are all above 500°C. Contrary to that tradition, we believe low-energy processes constitute a better alternative to enable the industrial application of single-molecule devices based on 2D materials. The present work addresses the postsynthesis processing of graphene at unconventional low temperature, low energy, and low pressure in the poly methyl-methacrylate- (PMMA-) assisted transfer of graphene to oxide wafer, in the electron-beam lithography with PMMA, and in the plasma patterning of graphene with a PMMA ribbon mask. During the exposure to the oxygen plasma, unprotected areas of graphene are converted to graphene oxide. The exposure time required to produce the ribbon patterns on graphene is 2 minutes. We produce graphene ribbon patterns with ∼50 nm width and integrate them into solid state and liquid gated transistor devices.

Influence de la qualité de l'éclairement sur les corrélations entre le cotylédon et son bourgeon axillaire chez le Linum usitatissimum

1992 ◽  
Vol 70 (5) ◽  
pp. 1087-1092
Author(s):  
Ahmed Fathi Oueida ◽  
Marie-Odile Desbiez
Keyword(s):  
Key Words ◽  
Nutrient Solution ◽  
Linum Usitatissimum ◽  
Dark Period ◽  
Red Light ◽  
Light Treatment ◽  
Low Energy ◽  
Experimental Conditions

The precedence of one cotyledonary bud over another, as a result of the removal of one of the cotyledons, can be measured quantitatively using the precedence index, g. When g tends towards +1, it is the bud opposite to the deleted cotyledon that takes the precedence, whereas when it tends toward −1, it is the axillant one. When g is close to 0, it corresponds to a globally symmetrical population of plants, in which the bud opposite to the deleted cotyledon and the axillant bud take the precedence in an approximately equal number of plants. When the flax is taken, after decapitation and removal of one cotyledon, on deficient nutrient solution under photoperiodicity of 9 h light: 15 h dark, index g is not affected if the dark period is replaced totally by a low-energy (3 W∙m−2) red light or partly by four periods of 20 min of red light during the dark period. In contrast, blue or far red light, under the same experimental conditions, caused g to tend towards 0 for all cultivars. This effect of the blue or far red light was antagonized by a following red light treatment, which suggests the interference of phytochrome. These observations were not observed with a Knop, ion-rich nutrient solution and at 18 W∙m−2, where g index remained close to +1. Key words: Linum usitatissimum, photomorphogenesis, bud, cotyledon, correlation.

scholarly journals Photoreduction of protochlorophyllide and its relationship to δ-aminolaevulinic acid synthesis in the leaves of dark-grown barley (Hordeum vulgare) seedlings

1986 ◽  
Vol 236 (3) ◽  
pp. 741-748 ◽  
Author(s):  
A K Stobart ◽  
I Ameen-Bukhari
Keyword(s):  
Hordeum Vulgare ◽  
Ternary Complex ◽  
Red Light ◽  
Acid Synthesis ◽  
The State ◽  
Low Energy ◽  
Alternative Scheme ◽  
Aminolaevulinic Acid ◽  
Close Relationship

The photoreduction of protochlorophyllide (Pchl) in dark-grown leaves of barley (Hordeum vulgare) brings about the synthesis of delta-aminolaevulinic acid (AmLev). Manipulation of the Pchl level in the leaves by incubation in AmLev indicated that the production of AmLev was intimately related to the state of the Pchl reductase ternary complex. Free Pchl reductase that is unassociated with substrate/product appeared at first to be essential for the photoinduction of AmLev synthesis. Experiments on the photoreduction of Pchl in dark-grown leaves exposed to low-energy red-light, however, showed that photoreduction and AmLev synthesis would occur when the Pchl reductase, together with substrate, was maintained at relatively high endogenous concentration. Under such conditions the availability of free reductase protein would be negligible. An alternative scheme is presented, therefore, that can explain many, if not all, of the observations on AMLev synthesis and its close relationship to Pchl reduction, and which is based on a common supply of NADPH for the reduction of glutamate to AmLev and the synthesis of chorophyll(-ide).

Independence of phytochrome destruction and physiological response in Avena and Pisum segment elongation

1972 ◽  
Vol 50 (1) ◽  
pp. 1-7 ◽  
Author(s):  
W. G. Hopkins
Keyword(s):  
Total Energy ◽  
Physiological Response ◽  
Maximum Rate ◽  
Red Light ◽  
Light Treatment ◽  
Low Energy ◽  
Maximum Efficiency ◽  
Avena Coleoptile ◽  
Physiological Action

Control over elongation in Avena coleoptile and Pisum epicotyl segments by cyclic far-red light treatment is dependent on the timing of successive irradiations and independent of total energy. The effect of each far-red irradiation in a cycle is cumulative. Maximum efficiency of far-red light in a cycle is obtained when the light treatments follow within 2 to 3 h of each other. Additional increments of elongation may also be obtained by successive red light treatment only when presented at least 8 to 9 h apart. The effect of a single far-red treatment is to establish a maximum rate of elongation which is maintained for no more than 3 h. The results offer support for the hypothesis that low-energy phytochrome mediated responses result from maintenance of low but maximally effective levels of Pfr and that Pfr destruction is essentially independent of physiological action.

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