Effect of light intensity on the quantum yield of photoinduced electron transfer from colloidal cadmium sulfide to methylviologen

1986 ◽  
Vol 90 (24) ◽  
pp. 6521-6522 ◽  
Author(s):  
Yoshio Nosaka ◽  
Marye Anne Fox
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Light Intensity ◽  
Cadmium Sulfide ◽  
Photoinduced Electron Transfer ◽  
Effect Of Light

scholarly journals Photoinduced 1,2,3,4-tetrahydropyridine ring conversions

2015 ◽  
Vol 11 ◽  
pp. 2166-2170
Author(s):  
Baiba Turovska ◽  
Henning Lund ◽  
Viesturs Lūsis ◽  
Anna Lielpētere ◽  
Edvards Liepiņš ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Solid State ◽  
Light Intensity ◽  
Photoinduced Electron Transfer ◽  
Driving Force ◽  
Spectroscopic Data

Stable heterocyclic hydroperoxide can be easily prepared as a product of fast oxidation of a 1,2,3,4-tetrahydropyridine by 3O2 if the solution is exposed to sunlight. The driving force for the photoinduced electron transfer is calculated from electrochemical and spectroscopic data. The outcome of the reaction depends on the light intensity and the concentration of O2. In the solid state the heterocyclic hydroperoxide is stable; in solution it is involved in further reactions.

scholarly journals Layer-Dependent Photoinduced Electron Transfer in 0D–2D Lead Sulfide/Cadmium Sulfide–Layered Molybdenum Disulfide Hybrids

ACS Nano ◽  
2019 ◽  
Vol 13 (7) ◽  
pp. 8461-8468 ◽  
Author(s):  
Jia-Shiang Chen ◽  
Mingxing Li ◽  
Qin Wu ◽  
Eduard Fron ◽  
Xiao Tong ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Cadmium Sulfide ◽  
Molybdenum Disulfide ◽  
Lead Sulfide ◽  
Photoinduced Electron Transfer

Morphology dependent photoinduced electron transfer from N,N-dimethylaniline to semiconductor cadmium sulfide

RSC Advances ◽  
2014 ◽  
Vol 4 (67) ◽  
pp. 35531 ◽  
Author(s):  
Sankalpita Chakrabarty ◽  
Harveen Kaur ◽  
Tanusri Pal ◽  
Soumitra Kar ◽  
Surajit Ghosh ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Cadmium Sulfide ◽  
Photoinduced Electron Transfer

The Formation of Fluorescent Alkali Metal and Alkaline Earth Complexes by 1-(2-{10-[2-Piperazinoethyl]-9-anthryl}ethyl)piperazine and Alkaline Earth Complexes by 4-(2-{10-[2-(1,4-Thiazinan-4-yl)ethyl]-9-anthryl}ethyl)thiomorpholine in Acetonitrile

2003 ◽  
Vol 56 (9) ◽  
pp. 917 ◽  
Author(s):  
Jason P. Geue ◽  
Nicholas J. Head ◽  
A. David Ward ◽  
Stephen F. Lincoln
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Alkali Metal ◽  
Metal Ions ◽  
Photoinduced Electron Transfer ◽  
Alkaline Earth ◽  
Alkali Metal Ions ◽  
Sandwich Complex ◽  
Complexation Constant ◽  
Typical Data

The formation of fluorescent alkali metal and alkaline earth complexes of 1-(2-{10-[2-piperazinoethyl]-9-anthryl}ethyl)piperazine (1) and alkaline earth complexes by 4-(2-{10-[2-(1,4-thiazinan-4-yl)ethyl]-9-anthryl}ethyl)thiomorpholine (2) in acetonitrile is reported. Both (1) and (2) have ‘fluorophore–spacer–receptor’ structures in the sequences ‘anthracene–dimethylene–piperazine’ and ‘anthracene–dimethylene–thiomorpholine’, respectively. Complexation by alkali metal ions and alkaline earth ions, Mm+, modulate photoinduced electron transfer (PET) to increase the fluorescence of (1) and complexation of alkaline earth ions similarly increases the fluorescence of (2). The two receptors of (1) and (2) may either complex Mm+ singly to form [ML]m+ or cooperatively to form a ‘sandwich’ complex [ML′]m+ characterized together by complexation constant K1 and quantum yield φ1. They may also complex two Mm+ in [M2L]2m+ characterized by K2 and φ2. Typical data are exemplified for (1) and Mm+ = Na+ by K1 = 1.33 × 105 dm3 mol–1 (φ1 = 0.02) and K2 = 4.20 × 102 dm3 mol–1 (φ1 = 0.07), for (1) and Mm+ = Ca2+ by K1 = 3.2 × 106 dm3 mol–1 (φ1 = 0.34) and K2 = 1.32 × 104 dm3 mol–1 (φ2 = 0.54), and for (2) and Mm+ = Ca2+ by K1 = 2.29 × 104 dm3 mol–1 (φ1 = 0.20) and K2 = 8.0 × 102 dm3 mol–1 (φ2 = 0.57) at 298.2 K and I = 0.05 mol dm–3 (NEt4ClO4). These data are compared with those for the alkaline earth complexes of 4-{2-[10-(2-morpholinoethyl)-9-anthryl]ethyl}morpholine. In 40 : 60 (v/v) 1,4-dioxan/water, protonation modulates PET to increase the fluorescence of (1)H44+ and (2)H22+. (The pKa values of (1)H44+ are 9.02, 8.06, 4.32, and 2.96 at 298.2 K and I = 0.05 mol dm–3 (NEt4ClO4).) The syntheses of (1) and (2) are reported.

scholarly journals A Study of the Photocatalytic Degradation of Acetaldehyde

2009 ◽  
Vol 5 (1) ◽  
pp. 598-602
Author(s):  
Suresh C. Ameta ◽  
Chetna Gomber
Keyword(s):  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Cadmium Sulfide ◽  
Cadmium Sulphide ◽  
Effect Of Light ◽  
Ph Concentration

Photocatalytic degradation of acetaldehyde over cadmium sulfide, a semiconductor was investigated. The effect of various parameters, such as pH, concentration of acetaldehyde, amount of semiconductor, effect of light intensity were observed. A tentative mechanism has been proposed for the photocatalytic degradation of acetaldehyde using cadmium sulphide semiconductor.

Effect of light intensity on the ultrastructure of the filamentous cyanobacterium, Anabaena variabilis

1988 ◽  
Vol 46 ◽  
pp. 300-301
Author(s):  
C. S. Bricker ◽  
S. R. Barnum ◽  
B. Huang ◽  
J. G. Jaworskl
Keyword(s):  
Fatty Acid ◽  
Light Intensity ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Anabaena Variabilis ◽  
Chloroplast Envelope ◽  
Major Constituent ◽  
Filamentous Cyanobacterium ◽  
Photosynthetic Membrane ◽  
Effect Of Light

Cyanobacteria are Gram negative prokaryotes that are capable of oxygenic photosynthesis. Although there are many similarities between eukaryotes and cyanobacteria in electron transfer and phosphorylation during photosynthesis, there are two features of the photosynthetic apparatus in cyanobacteria which distinguishes them from plants. Cyanobacteria contain phycobiliproteins organized in phycobilisomes on the surface of photosynthetic membrane. Another difference is in the organization of the photosynthetic membranes. Instead of stacked thylakolds within a chloroplast envelope membrane, as seen In eukaryotes, IntracytopIasmlc membranes generally are arranged in three to six concentric layers. Environmental factors such as temperature, nutrition and light fluency can significantly affect the physiology and morphology of cells. The effect of light Intensity shifts on the ultrastructure of Internal membrane in Anabaena variabilis grown under controlled environmental conditions was examined. Since a major constituent of cyanobacterial thylakolds are lipids, the fatty acid content also was measured and correlated with uItrastructural changes. The regulation of fatty acid synthesis in cyanobacteria ultimately can be studied if the fatty acid content can be manipulated.

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