The zero-field splitting of cyano-substituted benzenes in their lowest excited triplet states

Jong, Jaap de; MacLean, C.

doi:10.1016/0022-2364(73)90063-2

Cited by 2 publications

(2 citation statements)

References 45 publications

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“…The D and E values obtained in DBB are very similar to those reported by de Jong and MacLean [25]. No hfs were observed in this system.…”

Section: Terephthalonitrilesupporting

confidence: 91%

“…The linewidths of the x and yaxis peaks were estimated from the simulation of the observed spectra. The Our D value is similar to that reported by de Jong and MacLean [25] obtained in ethanol glass, but our E value is considerably smaller than their value, indicating that ZFS of benzonitrile may depend considerably on environment. Using Ax=-108 MHz, we obtain p4=0-335.…”

Section: Hyperfine Splittings and Linewidthssupporting

confidence: 89%

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Studies of hyperfine splittings and spin distributions of the lowest excited triplet states of substituted benzenes and pyridines

et al. 1975

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Hyperfine splittings and linewidths of the E.P.R. spectra of the lowest excited triplet states of several cyano-substituted benzenes, pyridines and 1,2,4,5-tetrachlorobenzene were studied, and spin distributions were estimated. These spin distributions as well as the zero field parameters were discussed in terms of the modified benzene ~ electron MO. It is shown that one excited configuration dominates in the studied systems, but a small amount of configuration mixing is necessary in order to explain ZFS. The experimentally determined spin densities were compared with those calculated from UHF methods in the case of benzonitrile and phenylacetylene. The calculated spin densities agree well with those estimated experimentally when proper choice of integral is made. It is also shown that the spin distributions in triplet state and radical anions are similar in the systems studied here. The geometries of the excited triplet states of substituted benzenes are also investigated from UHF calculation.

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“…The D and E values obtained in DBB are very similar to those reported by de Jong and MacLean [25]. No hfs were observed in this system.…”

Section: Terephthalonitrilesupporting

confidence: 91%

Section: Hyperfine Splittings and Linewidthssupporting

confidence: 89%

Studies of hyperfine splittings and spin distributions of the lowest excited triplet states of substituted benzenes and pyridines

et al. 1975

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Candidate Materials as Gain Media in Organic, Triplet-Based, Room-Temperature masers Targeting the ISM Bands

Wynsberghe¹,

Turak²

2017

Optoelectronics - Advanced Device Structures

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While lasers have enjoyed greater popularity, masers-which emit coherent radiation in the microwave spectrum-are also of critical importance to a variety of applications. Recently, an organic gain medium has been developed, which allows emission at room temperature without the traditional encumbrances of cryogenic cooling or an externally applied magnetic field, at vastly improved power efficiency. This discovery opens up new avenues for applications that were previously impractical. However, further investigation is still required for frequency tuning of the device, through the selection of alternate gain media beyond the original choice of pentacene-doped p-terphenyl and some linear acenes similar to the pentacene prototype. This chapter outlines some of the essential criteria necessary to achieve masing with an organic semiconductor gain medium, including zero-field splitting (ZFS), triplet sublevel division, and metastable population inversion. Three tables of possible candidate materials are presented based on this roster of criteria, particularly targeting emission in one of the industrial, scientific, and medical (ISM) bands. A selection of preferred guest molecules is recommended for in-situ testing as room-temperature masers gain media candidates.

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The zero-field splitting of cyano-substituted benzenes in their lowest excited triplet states

Cited by 2 publications

References 45 publications

Studies of hyperfine splittings and spin distributions of the lowest excited triplet states of substituted benzenes and pyridines

Studies of hyperfine splittings and spin distributions of the lowest excited triplet states of substituted benzenes and pyridines

Candidate Materials as Gain Media in Organic, Triplet-Based, Room-Temperature masers Targeting the ISM Bands

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