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Showing 1 to 20 of 23 for “"photochemical reaction"”.
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Following a Photochemical Reaction of Br2 using Photoion and Photoelectron Momentum Spectroscopy
… visualize both in order to comprehend chemical reactions. However, obtaining complete information about these two different dynamics using a single observable presents a challenge. Over the past two decades, attosecond science has emerged as a means to generate multiple observables from a …
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Photochemical Reaction Products of Polycyclic Aromatic Hydrocarbons Adsorbed at an Air-Water Interface
… which provides a unique venue for their photochemical degradation. The interfacial photodegradation of 9<i>H</i>-fluorene was evaluated by measuring the formation rate of its photooxidation products in films of different thickness in the thin-film reactor. By increasing the …
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Nanophase Separation and Photochemical Reaction of Rodcoil Molecules, Reactive Liquid Crystal Molecules, and Binary Mixtures
… characterized. These compounds contained photochemically sensitized groups such as anthracene and diacetylene segments. Irradiation of these materials at various temperatures led to the formation of distinct dimesogens and other high molecular weight material which allowed one of the …
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The Effects of Chemical Modification Upon Herbicide Binding in Thylakoid Membranes of Spinacia Oleracea (Spinach) and Amaranthus Hybridus (Pigweed), and The Photochemical Reaction Center of Rhodobacter Sphaeroides R26
Dicyclohexylcarbodiimide inhibits electron transfer between Q$\sb{\rm A}$ and Q$\sb{\rm B}$ in both higher plants and photosynthetic bacteria in an analogous manner to that seen for the classic Photosystem II inhibitors such as diuron and atrazine. It does not bind to the same binding domain as …
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Development of a new actinometric method for polychromatic light irradiation. Application to photochromes, drugs and stilbenoids
… regarding parameter representation of the photoreaction and the reproducibility of associated results. The other models available in the literature use approximation and expansion methods to solve the photochemical rate law but are unfortunately unable to provide robust models to describe the …
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Photochemical reactions of tetraorganoborate salts: Electron transfer-mediated photoreductions and alkylations and di-pi-borate rearrangements
The photochemical reaction of sodium borohydride and methyltriphenylborate with halo-substituted cyanonaphthalenes has been studied. The reaction leads to photo-dehalogenation in high yield. Sodium borohydride was also found to react photochemically with dicyanonaphthalene, leading to reduction …
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Competing reaction pathways in the photochemical reactions of metal carbonyl compounds
The photochemical reaction of Mn$\sb2$(CO)$\sb{10}$ with HSnBu$\sb3$ has been studied by continuous photolysis. Sunlamp irradiation of a CO-saturated hexane solution of Mn$\sb2$(CO)$\sb{10}$ and HSnBu$\sb3$ results in formation of HMn(CO)$\sb5$ and Bu$\sb3$SnMn(CO)$\sb5$ in equimolar quantities. …
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Dinitrogen fixation chemistry of a molybdenum trisanilide system
… of time-dependent density functional theory. A photochemical reaction of ([mu]-N2)[Mo(N[t-Bu]Ar)3]2 that forms both Mo(N[t-Bu]Ar)3 and N=Mo(N[t-Bu]Ar)3 is described. The dynamics of this photochemical reaction are explored by ultrafast transient absorbance spectroscopy. A synthetic scheme for …
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The Structure and Function of Chlorophyll-Proteins in Photosystem I and The Light Harvesting Complex of Photosystem Ii
… light energy and to transfer absorbed energy to photochemical reaction centers where charge separation occurs. The structure and function of the chlorophyll-proteins of PS I and the light harvesting complex of PS II have been analyzed to provide information concerning the organization of …
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Reactions of Manganese Carbonyl Radicals: Electron Transfer, Atom Transfer and Substitution
The photochemical reaction of Mn(,2)(CO)(,10) with pyridine and several alkyl- and halogen-substituted pyridines as neat solvents has been studied. Initial products of the reaction are Mn(,2)(CO)(,9)py and {Mn(CO)(,3)(py)(,3)('+)}{Mn(CO)(,5)('-)}. Continued photolysis leads eventually to …
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Singlet Oxygen Generation Via Irradiation of 4-Benzylamino-7-Nitrobenz-2-Oxa-1, 3-Diazole
… with 1, 3-cyclohexadiene (CHD) as acceptor. A reaction between BBD and the acceptor rendered this method of singlet oxygen detection useless. In a second approach, the rate of light-induced oxygen consumption for solutions having various components was measured. The results showed that for a …
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Thermal and Photochemical Interaction of CO2 with Biochar
… in three significant observations. These reactions were carried out thermally at 333K and photochemically by simulating energy from the with a xenon lamp. The photochemical reaction involving biochar, CO2 with water or a mixture of water and ethanol as hydrogen donor led to a decrease in …
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Delayed fluorescence as a probe of radiationless transitions in anthracene and algae
… the production of triplets is mediated by a photochemical reaction center (photosystem II). The evidence for this model is based on an extensive study of the time dependence of the luminescence decay and the observation that, at low light levels, the delayed fluorescence' intensity is …
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Novel Organic Transformations Arising from Gold(I) Chemistry
… development of a Au(I) catalyzed polycyclization reaction inspired by this transformation. The reaction demonstrated the ability of Au(I) to successfully catalyze the formation of multiple C-C bonds and resulted in the synthesis of benzothiophenes, benzofurans, carbazoles and hydrindene. With the …
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Multiple Kinetic Resolution of Tetrathia[7]helicenes. Towards the Study of Two Photon Circular Dichroism.
… building block, previously obtained via a photochemical reaction, and for which we developed an alternative chemical synthesis1. The second part of the project focused on the kinetic resolution, designed to obtain formyland diformylhelicene. Two strategies were identified to obtain the …
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Bioavailable Iron in Equatorial Pacific Ocean Aerosol Samples
… size aerosol samples. A typical analysis of photochemical reaction with addition of EDs can be performed in five minutes. Results indicate that Fe(III) is reduced in the presence of light with ED that are already present in the collected aerosols, the external additions of ED have an …
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The study of organic crystals by atomic force microscopy
… study of their surfaces is crucial, as several reactions occur at the interface between the crystal surface and its immediate environment. While atomic force microscopy (AFM) is a useful tool for studying surfaces, it is not a common technique for studying organic crystals. The rst part of this …
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Experimental investigation and analyses of continuous type hybrid photoelectrochemical hydrogen production systems
… using electrodes as electron donors to drive the photochemical reaction, the potential of pollutant emissions are minimized. Four different processes are tested by using the present reactor: electrolysis, PEC, chloralkali, and PEC-chloralkali. During all processes, the present reactor is tested …
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Second Generation Photoactivated Insulins
… irradiation. Since the insulin photorelease is a photochemical reaction, the amount released can be tightly controlled by varying the duration of irradiation. PAD is beneficial for diabetics as it can deliver insulin in a continuously variable fashion and can be automated as an artificial pancreas …
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Investigation of nitroxide-mediated thermal and photochemical reactions of living free radical polymerization.
… of this process have been studied; thermal and photochemical reaction sequences. Stoichiometric unimolecular initiators were found to be ideal probes for studying the reactions involved in the LFRP process. The bond dissociation energy (BDE) of the labile C-O bond of the alkoxyamine initiators …
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