Photochemical determination of the solubility of oxygen in various media

Franco, Chris H. J.; Olmsted, J.

doi:10.1016/0039-9140(90)80251-a

Cited by 139 publications

(119 citation statements)

References 14 publications

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“…Assuming a diffusion-limited rate of reaction with oxygen (2 × 10 10 M −1 s −1 [39,40]), which is present in air-saturated acetonitrile at a concentration of 2.42 mM [41], and using the previous rates for self-quenching and triplet decay, a triplet lifetime of ~20 ns is calculated. This lifetime indicates why triplet detection requires argon purging in the nanosecond, but not in the femtosecond experiments.…”

Section: Assignment Of Bands Observed In Ns Trir Spectra To the Lowesmentioning

confidence: 99%

Time-resolved infrared spectroscopy of the lowest triplet state of thymine and thymidine

et al. 2008

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Vibrational spectra of the lowest energy triplet states of thymine and its 2'-deoxyribonucleoside, thymidine, are reported for the first time. Time-resolved infrared (TRIR) difference spectra were recorded over seven decades of time from 300 fs -3 µs using femtosecond and nanosecond pumpprobe techniques. The carbonyl stretch bands in the triplet state are seen at 1603 and ~1700 cm −1 in room-temperature acetonitrile-d 3 solution. These bands and additional ones observed between 1300 and 1450 cm −1 are quenched by dissolved oxygen on a nanosecond time scale. Density-functional calculations accurately predict the difference spectrum between triplet and singlet IR absorption cross sections, confirming the peak assignments and elucidating the nature of the vibrational modes. In the triplet state, the C4=O carbonyl exhibits substantial single-bond character, explaining the large (~70 cm −1 ) red shift in this vibration, relative to the singlet ground state. Femtosecond TRIR measurements unambiguously demonstrate that the triplet state is fully formed within the first 10 ps after excitation, ruling out a relaxed 1 nπ* state as the triplet precursor.

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Section: Assignment Of Bands Observed In Ns Trir Spectra To the Lowesmentioning

confidence: 99%

Time-resolved infrared spectroscopy of the lowest triplet state of thymine and thymidine

et al. 2008

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“…It is likely associated with lower oxygen solubility in DMSO [30]. The highest fluorescence quantum yield was obtained for Porphyrin 2.…”

Section: Resultsmentioning

confidence: 89%

Physicochemical properties of potential porphyrin photosensitizers for photodynamic therapy

Kempa

Kozub

Kimball

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…70 Bruckel and Kim 33 have determined the solubility of three gases in NMF, and both Smiley 69 and Castells et al 32 have obtained activity coefficients for a number of hydrocarbons, some of which overlap with the solutes used by Gruber et al 95 There is also a value for the solubility of oxygen, 96 in NMF.…”

Section: Resultsmentioning

confidence: 99%

Partition of compounds from water and from air into amides

2009

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Literature data on partitioning of compounds from the gas phase to a number of amides and from water to the amides has been collected and analyzed through the Abraham solvation equations. The resulting equations are statistically good enough to be used for the prediction of further partition coefficients, and allow deductions to be made about the chemical properties of the amides, as solvents. For example, tertiary amides have no hydrogen bond property at all, secondary amides are rather weak hydrogen bond acids, and primary amides are stronger hydrogen bond acids than are alcohols as solvents. Equations for partitioning from the gas phase to amide solvents can also be used to test if the amides are possible models for a number of biological phases and biological processes. It is shown that no organic solvent is a suitable model for phases such as blood, brain, muscle, liver, heart or kidney, but that a number of rather non-polar solvents are models for fat. N-methylformamide is shown to be the best (and excellent) model for eye irritation and nasal pungency in humans, suggesting that the receptor site in these processes is protein-like.

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Photochemical determination of the solubility of oxygen in various media

Cited by 139 publications

References 14 publications

Time-resolved infrared spectroscopy of the lowest triplet state of thymine and thymidine

Time-resolved infrared spectroscopy of the lowest triplet state of thymine and thymidine

Physicochemical properties of potential porphyrin photosensitizers for photodynamic therapy

Partition of compounds from water and from air into amides

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