Organic photochemistry: the laser vs. the lamp. The behavior of diphenylcarbene generated at high light intensities

Turro, Nicholas J.; Aikawa, Masanori; Butcher, Jared A.; Griffin, G. W.

doi:10.1021/ja00535a066

Cited by 35 publications

(24 citation statements)

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“…This can explain reactivity differences between the ground and excited states of the carbene. 8 Furthermore, the number and shape of the holes burned depend on the molecular symmetry of the carbene as well as on the relaxation channels of the excited state. 2,3 In this work we present and discuss the results of a holeburning study of a new, rigid, and planar aromatic carbene, 7H-benz[de]anthracen-7-ylidene (7-BAC).…”

Section: Introductionmentioning

confidence: 99%

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Kozankiewicz¹,

Aloshyna²,

Sienkiewicz³

et al. 2000

J. Phys. Chem. A

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Spectral holes were burned within the inhomogeneous (0,0) fluorescence excitation line of the T 0 fT 1 transition of 7H-benz[de]anthracen-7-ylidene in an n-hexane matrix at 1.7 K. The complicated spectrum of the obtained holes was interpreted with a model taking into account the zero-field splitting (ZFS) of both the triplet states contributing to the transition, the enforced planar symmetry of the carbene, and the domination of internal conversion in the relaxation of the excited T 1 state. Analysis of the hole-burning spectra produced the following ZFS parameters of the ground T 0 and excited T 1 states: D 0 ) (0.274 ( 0.001) cm -1 + E 1 , E 0 ) (0.0292 ( 0.0002) cm -1 + E 1 and D 1 ) (0.0168 ( 0.0002) cm -1 + E 1 . The number of possible transitions between different spin sublevels is reduced as a consequence of the symmetry plane in the carbene and one of the ZFS parameters, we chose the smallest, E 1 , cannot be estimated. The ZFS parameters of the T 0 state were also estimated by conventional matrix ESR and were in good agreement with the results of the hole burning experiments.

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Section: Introductionmentioning

confidence: 99%

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Kozankiewicz¹,

Aloshyna²,

Sienkiewicz³

et al. 2000

J. Phys. Chem. A

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“…The aromatic radicals proposed to have been formed in our n C experiments are (11) C 6 H 5 CH, (11) C 6 H 5 CH 2 , and (11) C 6 H 5 . In analogy to radiolysis studies of Ho and Freeman [35] and of Turro et al [36], the three monomelic oxygenated labelled products can then be formed via the following reaction pathways : [24,25].…”

Section: Scavenger Studiesmentioning

confidence: 94%

Reactions of Recoil¹¹C Atoms with Benzene

et al. 1997

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“…FAB HRMS {(m + l)/z) calcd for C,,H,,O: 287.1436; found: 287.1436 (100). (14): To dry THF (50 mL) was added with stirring a hexane solution of n-hutyllithium ( 1 . 6~, 5.5 mL) and TMEDA (1.2 mL) under argon atmosphere at -78 "C. Acetylene was then bubbled through the solution with vigorous stirring at -78 "C. After the acetylene absorption was complete, as judged by appearance of a slurry, the gas flow was stopped and the solution was stirred for 0.5 h. Crude 13 (1.79 g) was added to the mixture at -78 "C to give a clear solution, which was then allowed to warm up to 10 "C. The reaction mixture was quenched with aqueous ammonium chloride, extracted with diethyl ether.…”

Section: 5-dibenzylbenzaldehyde (13)mentioning

confidence: 99%

Design and Synthesis of a “Starburst”‐Type Nonadiazo Compound and Magnetic Characterization of Its Photoproduct

Matsuda

Nakamura

Inoue

et al. 1996

Chemistry A European J

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A "starburst"-type nonadiazo compound was designed and synthesized by using the cyclotrimerization of 3 3 -dibenzylphenyl ethynyl ketone as a key step. The diazo compound was photolyzed in methyltetrahydrofuran solid solution at cryogenic temperatures and analyzed by means of Faraday magnetometry and EPR spectroscopy. While the m-phenylene-connected nonacarbene was predicted to have a nonadecet ( S = 9) ground state, the magnetic data of the photoproduct was more consistent with a pentadecet ( S = 7) species. The result was interpreted in terms of the intramolecular

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Organic photochemistry: the laser vs. the lamp. The behavior of diphenylcarbene generated at high light intensities

Cited by 35 publications

References 0 publications

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Reactions of Recoil¹¹C Atoms with Benzene

Design and Synthesis of a “Starburst”‐Type Nonadiazo Compound and Magnetic Characterization of Its Photoproduct

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Organic photochemistry: the laser vs. the lamp. The behavior of diphenylcarbene generated at high light intensities

Cited by 35 publications

References 0 publications

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Zero-field Splitting of the Triplet Ground and Excited States of 7H-Benz[de]anthracen-7-ylidene in n-Hexane at 1.7 K: A Hole Burning Study

Reactions of Recoil11C Atoms with Benzene

Design and Synthesis of a “Starburst”‐Type Nonadiazo Compound and Magnetic Characterization of Its Photoproduct

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Reactions of Recoil¹¹C Atoms with Benzene