Photoreactions of di-p-anisylidenefulgide (di-p-anisylidenesuccinic anhydride)

Cohen, M. D.; Kaufman, H. W.; Sinnreich, D.; Schmidt, G.

doi:10.1039/j29700001035

Cited by 21 publications

(26 citation statements)

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“…19 However, E,E stereochemistry was proved to exist. 20,21 According to the literature, 20 Z,Z-, E,E-and Z,E-compounds undergo some thermal interconversion in solution. In acetonitrile, * Correspondent.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and X-ray Crystal Structure of Novel (3E,4E)-1-aryl-3,4-bis[(benzo[d][1,3]dioxol-5-yl)methylidene]pyrrolidene-2,5-dione

Zhang

Xie

et al. 2013

Journal of Chemical Research

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Section: Resultsmentioning

confidence: 99%

“…This absorption spectra are similar to trans,trans-dibenzylidenesuccinic anhydride given by other authors. 20,22 The intense absorption around 325 nm should be the characteristic absorption peak of E,E-form, while the weaker absorption around 415 nm is caused by Z,E-form and Z,Z-form.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and X-ray Crystal Structure of Novel (3E,4E)-1-aryl-3,4-bis[(benzo[d][1,3]dioxol-5-yl)methylidene]pyrrolidene-2,5-dione

Zhang

Xie

et al. 2013

Journal of Chemical Research

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“…Consequently, nonstoichiometric phases such as A~ ~+ [CsCrOs] x-, formed by electrochemical intercalation of an alkali metal A into CsCrO3 should be more stable, i.e., show a more positive potential than the corresponding binary alkali metal graphites Azz+Cs x- (14). Indeed, a cell comprising a cathode prepared by heating (16) CrO3 and graphite, a fl-aIumina solid electrolyte, and a Na anode shows an emf of 3.9V (14) and may be discharged at more than 3V, whereas the potentials of binary alkali metal graphites ACs are < + 1V vs. free A (17). From x-ray data it was however concluded in a recent publication that heating of CrO3 and graphite does not yield a CrQ-graphite intercalation compound but results in a mixture of unreacted graphite and the oxide CrsOs as the main thermal decomposition product of CrO~ (18).…”

Section: And R Sch~llhornmentioning

confidence: 99%

Alkali Peroxydisulfates for Water‐Activated Reserve Batteries

Dafler¹

1977

J. Electrochem. Soc.

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Peroxydisulfates (persulfates) possess very high specific free energy changes for oxidation in aqueous systems. The alkali persulfates are very soluble and yield, in 40% aqueous systems, cell voltages, at the 4 hr rate, that exceed 2V. Persulfates are stable and can be dry-stored for long periods with little loss of oxidizing power. Used in conjunction with Mg alloy (AZ-61) anodes, persulfate cells can be activated with most common aqueous media. The Na2S2Os/AZ-61 cell has fast start-up capability and a flat discharge characteristic at all reasonable rates of discharge. Comparisons to other battery systems at equivalent currents and rates are presented. The persulfate cell is seen as a potentially useful reserve battery for either high or low rates~ Water-activated batteries were rapidly developed during the 1940's when there was specific need for long shelf-life, higher power, reserve systems. The impetus for development came from military applications (1, 2). An early result of the intensive work done to develop such new energy sources was the silver chloridemagnesium reserve battery, which became commercially available in 1943 (3, 4). After 1946; applications for the AgC1/Mg battery grew rapidly and this system, despite its relatively high cost, became widely adopted. It has been used for weather baUons, air-sea rescue equipment, and sonobuoys, the latter application having accounted for a major fraction of production.The cuprous chloride-magnesium reserve battery (Cu2C12/Mg) first became commercially available in 1949 (5, 6). Like the AgC1/Mg battery, it is a long shelf-life, water or seawater activated unit. It is not suitable for the same kinds of use as the AgC1/Mg battery, having lower rate capability and, generally, lower energy density.The high cost of silver and the lower rate capabilities of Cu2C12 have led to considerable effort to find other systems suitable to replace the AgC1/Mg system. A number of water-activated systems appeared in the 1970's and deserve mention. Aluminum/ai?" battery.--The Furukawa BatteryCompany, Limited, of Tokyo introduced an aluminum/ air battery in 1969 (7). It consisted of a series of closed cells containing KOH pellets and utilized a 2.54 mm thick aluminum anode and a 3.38 mm thick, porous carbon, air breathing cathode. The battery was a fivecell device activated with water poured into one cell, which then filled all five subunits through overflow connections. Sold as a low rate (0.3A) battery, this system did not fulfill its advertised energy density goals. Moreover, though sealed in water-vapor resistant PET-plastic film bags, the KOH deteriorated after 5-6 months of storage.Cuprous ~2uoride/magnesium.--This cell system, Cu2F2/Mg (AZ-31) is a retained electrolyte cell of tea-* Electrochemical Society Active Member.1 Present address: Institute of Gas 'l~eehnology, Chicago, Illinois 60616.Key words: magnesium electrodes, persulfatesj water-activated batteries.sonably high power density (8). It was not, in the configurations tested here, a water-activated battery, but car...

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“…[6] A similar ring-puckering mechanism is active in the nucleobases of the DNA backbone. [7,8] In this case nature has also built in the perfect mechanism for deactivation to turn UV excitation energy into heat on the ground state, which can be channeled away via the hydrogen bonding network in an aqueous media. [9] This deactivation mechanism prevents the potentially destructive reactions that can take place on the excited state surfaces.…”

Section: Introductionmentioning

confidence: 99%

Putting the Disulfide Bridge at Risk: How UV‐C Radiation Leads to Ultrafast Rupture of the S‐S Bond

et al. 2018

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We investigate the ultrafast photoinduced dynamics of the cyclic disulfide 1,2-dithiane upon 200 nm excitation by time-resolved photoelectron spectroscopy and show that the S-S bond breaks on an ultrafast time scale. This stands in stark contrast to excitation at longer wavelengths where the initially excited S state evolves as the wavepacket is guided towards a conical intersection with S by a torsional motion involving a partially broken bond between the sulfur atoms. This process at lower excitation energy allows for efficient (re-)population of S , rendering dithiane intact. At 200 nm, in contrast, the excitation leads to a manifold of higher excited states, S , that are primarily of Rydberg character. We are able to follow the gradual transition from the initially excited state to the dissociative receiver state in real time. The Rydberg states are intersected by a repulsive valence state that mediates a transition to the repulsive S surface. Therefore, we propose that the resulting diradical will eventually break apart on a longer timescale. The findings imply that upon going from UV-B to UV-C light the structural integrity of the disulfide moiety is compromised and proteins irradiated in this range will not be able to reform the initial tertiary structure, leading to loss of function.

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Photoreactions of di-p-anisylidenefulgide (di-p-anisylidenesuccinic anhydride)

Cited by 21 publications

References 0 publications

Synthesis and X-ray Crystal Structure of Novel (3E,4E)-1-aryl-3,4-bis[(benzo[d][1,3]dioxol-5-yl)methylidene]pyrrolidene-2,5-dione

Synthesis and X-ray Crystal Structure of Novel (3E,4E)-1-aryl-3,4-bis[(benzo[d][1,3]dioxol-5-yl)methylidene]pyrrolidene-2,5-dione

Alkali Peroxydisulfates for Water‐Activated Reserve Batteries

Putting the Disulfide Bridge at Risk: How UV‐C Radiation Leads to Ultrafast Rupture of the S‐S Bond

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