The photochemistry of 1,2-cyclobutanedione in the gas phase

Back, R. A.; Cao, Jianwei

doi:10.1016/0047-2670(86)87030-7

Cited by 11 publications

(1 citation statement)

References 20 publications

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“…It is a yellow solid, and visible absorption bands have been observed in solution (6), but no gas-phase spectra appear to have been measured. In conjunction with photochemical studies of CBD (7), we have measured the visible absorption spectrum, which we now report in detail in the present paper. To aid in the vibrational analysis, the infrared absorption spectrum, not previously reported, was also measured.…”

Section: Introductionmentioning

confidence: 99%

The visible absorption spectrum of 1,2-cyclobutanedione in the gas phase

Back¹,

Parsons²

1986

Can. J. Chem.

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Theovisible absorption spectrum of 1,2-cyclobutanedione has been measured in the gas phasc at wavclcngths between 4000 and 5100 A. The absorption is attributed to the allowed IT* +-ni , ' B I + 'A transition corresponding to the first excited singlet state. The spectrum shows a complex well-resolved vibrational structure which has been analysed. with some 125 bands measured and assigned. The ban$ at the longer wavelengths show sharp rotational fine structure, not yet analysed. The strongest band in the spectrum at 4933 A has been assigned as the 0-0 band, while a band almost as strong at 4820 A is attributed to excitation of one quantum of v i 2 , the a 2 out-of-plane carbonyl bending vibration, and it is suggested that this band owes its intensity to vibronic coupling. A number of symmetric vibrations are also excited in the spectrum, but with no long progressions. Sequence bands running to the blue with an interval of about 72 cmp' are prominent throughout the spectrum, and are assigned to v13, the a z ring-twisting vibration. Other hot bands were also observed involving v13 which permitted estimation of energy levels for this vibration both in the ground state and the excited state. The infrared spectrum was also measured and analysed in the gas phase between 600 and 4000cm-', and 14 bands were assigned to fundamcntal vibrations; some of these assignments, at the lower frequencies, are uncertain. [Traduit par la revue]

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Section: Introductionmentioning

confidence: 99%

The visible absorption spectrum of 1,2-cyclobutanedione in the gas phase

Back¹,

Parsons²

1986

Can. J. Chem.

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Table of Reaction Rate Constants of Photo‐Degradation Processes

Klöpffer¹,

Wagner²

2007

Atmospheric Degradation of Organic Substances

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Photochemistry of Bicyclo[2.2.2]oct‐5‐Ene‐2,3‐Diones and Reactions of the Intermediates Bicyclo[4.2.0]oct‐2‐Ene‐7,8‐Diones

Liao

Ueng

1993

J Chinese Chemical Soc

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Irradiation of bicyclo[2.2.2]oct‐5‐ene‐2,3‐diones la‐c proceeded quantitatively via 1,3‐acyl shifts to yield the corresponding bicyclo[4.2.0]oct‐2‐ene‐7,8‐diones 2a‐c that underwent bisdecarbonylation to afford also quantitatively 1,3‐cyclohexadienes 3a‐c upon further excitation. In contrast the thermolysis of 2c produced lc and 4; the kinetic parameters were found to be ΔH≠ = (90.4 ± 0.8) kJ mot.1 and ΔS≠ = (−12.1 ± 0.1) J K−1 mol−1.

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The photochemistry of 1,2-cyclobutanedione in the gas phase

Cited by 11 publications

References 20 publications

The visible absorption spectrum of 1,2-cyclobutanedione in the gas phase

The visible absorption spectrum of 1,2-cyclobutanedione in the gas phase

Table of Reaction Rate Constants of Photo‐Degradation Processes

Photochemistry of Bicyclo[2.2.2]oct‐5‐Ene‐2,3‐Diones and Reactions of the Intermediates Bicyclo[4.2.0]oct‐2‐Ene‐7,8‐Diones

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