Validity and possibility of photoconductivity-detected magnetic resonance (PCDMR) method as one of reaction-yield-detected magnetic resonance (RYDMR) methods

Itoh, Takashi; Matsuyama, Akihito; Maeda, Kiminori; Murai, Hisao

doi:10.1016/s0009-2614(00)01361-0

Cited by 11 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This pulse efficiently inverts one of the spins of the radical pair. The absorbance difference using the optimum delay (t2 = 500 ns) conditions provides the ADMR spectrum as shown in figure 2 (6). To determine the most efficient 7r pulse width, a quantum beat observation was carried out that will be presented later.…”

Section: Resultsmentioning

confidence: 99%

Observation and reaction control of a singlet born radical pair formed photochemically in an SDS micelle by pulsed microwave irradiation

2002

Self Cite

View full text Add to dashboard Cite

The photochemical reaction of tetraphenylhydrazine in an SDS micellar solution is studied using a transient absorption detected magnetic resonance (ADMR) method. This system is photo-dissociated via the singlet excited state and forms a transient radical pair. Strong microwave irradiation of this system under an X band EPR magnetic field provides an ADMR spectrum of the singlet born radical pair as the optical absorbance change of the diphenylaminyl radical. The employment of a short duration microwave pulse that efficiently flips the electron spin quantum (Am, = 1) controls the reaction of the radical pair, and the reaction rate constant of this system is determined. Furthermore, changing the microwave duration shows the quantum beat of this system induced by the electromagnetic field. This beat signal carries both a single beat that corresponds to the Rabi frequency and a doublefrequency beat that is due to simultaneous two-spin controlling.

show abstract

Section: Resultsmentioning

confidence: 99%

Observation and reaction control of a singlet born radical pair formed photochemically in an SDS micelle by pulsed microwave irradiation

2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…The latter was explained by the observation of the RIP formed by a biphotonic process. To eliminate the doubt about the validity of the PCDMR method, Itoh et al [131] tried the dual observation of PCDMR and FDMR spectra of the photoinduced electron transfer reaction in the system of pyrene cation and 1,3-dicyanobenzene anion radicals. The data showed that the newly developed PCDMR method was reliable and useful in studying the CT reactions.…”

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

Developments of magnetic-resonance-related spin chemistry in Japan

et al. 2003

View full text Add to dashboard Cite

Abstraet. A review on the developments of the magnetic-resonance-related spin chemistry in Japan is presented. We describe how studies in this atea started in Japan and developed into the flourishing state of the present. Important contributions made by Japanese spin chemists in the last two decades in three areas, namely, work on chemically induced dynamic electron polarization, excited states and controlling of photochemical reactions, are presented. More emphases are placed on the new deveIopments in recent years, particularty new concepts and new methodologies.

show abstract

“…It should be mentioned that this gain is also provided by an extremely low level of intrinsic noise of photomultipliers [18], which are used if the signal is recorded by the intensity of the recombination luminescence. In addition to recombination luminescence, EPR spectra of paramagnetic particles participating in the recombination can be detected by the resonant change in the optical absorption intensity (ADMR) [19] or by the induced photoconductivity current (PCDMR, EDMR) [20]. In the last two decades, the use of indirect methods of EPR detection has been mainly associated with the study of photo-induced charge separation in organic semiconductor polymer systems and electroluminescent processes in organic semiconductors [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Application of Pyroelectric Sensors Based on PVDF Films for EPR Spectra Detection by Heat Release

Melnikov

Zikirin

Kalneus

et al. 2021

Sensors

View full text Add to dashboard Cite

Pyroelectrics are a wide class of materials that change their polarization when the system temperature varies. This effect is utilized for a number of different commercial and industrial applications ranging from simple thermal sensors and laser interferometers to water vapor harvesting. Electron paramagnetic resonance (EPR) spectroscopy is a powerful tool for studying the structure and dynamics of materials with unpaired electrons. Since heating accompanies a resonant change of the orientation of electron spins in an external magnetic field, pyroelectrics can be utilized as versatile detectors for so-called indirect detection of the EPR signal. In this work, we investigated three different types of PVDF (polyvinylidene difluoride) standard pyroelectric films with indium tin oxide, Cu/Ni, and Au coatings to determine their sensitivity for detecting EPR signals. All the films were shown to be able to detect the EPR spectra of about 1 μg of a standard stable free radical by heat release. A comparative study based on the calculation of the noise-equivalent power and specific detectivity from experimental spectra showed that the Au coated PVDF film is the most promising active element for measuring the EPR signal. Using the best achieved sensitivity, estimation is given whether this is sufficient for using a PVDF-based pyrodetector for indirectly detecting EPR spectra by recombination heat release or not.

show abstract

Validity and possibility of photoconductivity-detected magnetic resonance (PCDMR) method as one of reaction-yield-detected magnetic resonance (RYDMR) methods

Cited by 11 publications

References 17 publications

Observation and reaction control of a singlet born radical pair formed photochemically in an SDS micelle by pulsed microwave irradiation

Observation and reaction control of a singlet born radical pair formed photochemically in an SDS micelle by pulsed microwave irradiation

Developments of magnetic-resonance-related spin chemistry in Japan

Application of Pyroelectric Sensors Based on PVDF Films for EPR Spectra Detection by Heat Release

Contact Info

Product

Resources

About