Photoprocesses in diphenylpolyenes. Oxygen and heavy-atom enhancement of triplet yields

Chattopadhyay, S.; Das, P. K.; Hug, Gordon L.

doi:10.1021/ja00381a001

Cited by 78 publications

(60 citation statements)

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“…The description of the apparatus is given in ref. 24. 6~h e measured fluorescence lifetime ( T~) for DCN is 9.5 ns which is in agreement with the previously reported value 10.06 (19 For personal use only.…”

Section: Resultssupporting

confidence: 81%

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Reichel¹,

Griffin²,

Müller³

et al. 1984

Can. J. Chem.

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Section: Resultssupporting

confidence: 81%

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Reichel¹,

Griffin²,

Müller³

et al. 1984

Can. J. Chem.

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“…In the case considered, the liquid solution was not degassed and the values of 1 are therefore slightly lower due to oxygen quenching. Cehelnik et al [20] obtained 6.1 ns for DPH in benzene, the respective value reported by Chattopadhyay et al [21] being 7.2 ns. In cyclohexane and methanol 12,9 ns and 5.2 ns were obtained, respectively [21].…”

Section: Fluorescence Lifetimesmentioning

confidence: 53%

“…Cehelnik et al [20] obtained 6.1 ns for DPH in benzene, the respective value reported by Chattopadhyay et al [21] being 7.2 ns. In cyclohexane and methanol 12,9 ns and 5.2 ns were obtained, respectively [21]. It is worth mentioning that double exponential fluorescence decay with lifetimes x x and t 2 is observed for DPH in non-heated and weakly heated PVA film (see Table 1).…”

Section: Fluorescence Lifetimesmentioning

confidence: 53%

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Kawski

Kubicki

Kukliński

et al. 1993

Zeitschrift Für Naturforschung A

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The effect of temperature on the absorption and fluorescence spectra of l,6-diphenyl-l,3,5-hexatriene (DPH) was investigated in three different polymer films: polyvinyl chloride) (PVCh), polyvinyl formal) (PVF) and polyvinyl alcohol) (PVA) in the temperature range 296-423 K. Anomalous behaviour of the fluorescence intensity was observed only for DPH in non-heated PVA film. The intensity distribution in the fluorescence band of DPH in both non-heated and heated PVCh and PVF films was found to be independent of the excitation light wavelength, A exc . The behaviour of DPH is similar in the PVA film heated to 423 K. For these samples, single exponential fluorescence decay was observed. The behaviour of non-heated DPH samples in PVA is quite different, the intensity distribution and the fluorescence band position depending strongly on ^. exc and the fluorescence decay being double exponential. It can be inferred that the fluorescence of DPH in a non-heated PVA sample consists of two components, the first originating from the all-trans conformer and the second from the ground-state s-eis conformer.

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“…The correct mechanism for generation of the longlived fluorescence has to take the following experimental findings into account: 1) fluorescence lifetimes up to ~70 ns, see Figure 1; 2) zero order decay of fluorescence intensity at short times followed by exponential decay, see Figure 2; 3) significant population of the DPH triplet state, because we observed intense triplet-triplet absorption (spectra not shown here, since they are well known [19,20,24,36,37] Different mechanisms can be discussed to explain these effects. It is known, that triplet-triplet annihilation (TTA) generates excited singlet state population with an increased fluorescence lifetime.…”

Section: Resultsmentioning

confidence: 99%

Intense Long-Lived Fluorescence of 1,6-Diphenyl-1,3,5-Hexatriene: Emission from the S<sub>1</sub>-State Competes with Formation of O<sub>2</sub> Contact Charge Transfer Complex

Hunger¹,

Kleinermanns²

2013

OJPC

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The fluorescence kinetics of 1,6-diphenyl-1,3,5-hexatriene (DPH) dissolved in cyclohexane was investigated as a function of temperature, concentration and 355 nm excitation pulse energy. At concentrations above 2.5 μM and excitation energies above 1 mJ a long-lived, very intense emission, which appears within less than 5 ns and lasts up to 70 ns, is observed. During the first 50 ns the decay does not follow an exponential but rather a linear behaviour. In oxygen saturated solutions the long-lived emission is suppressed and solely short-lived fluorescence with τ < 5 ns can be detected. A kinetic simulation was performed, based on a model whereupon the long-lived emission originates from the S 1 -state and competes with the formation of DPH-O 2 contact charge-transfer complexes and intersystem crossing which both quench the fluorescence. Our investigations show that even the small amount of oxygen dissolved in nitrogen saturated solutions has a distinct influence on the fluorescence kinetics of DPH.

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Photoprocesses in diphenylpolyenes. Oxygen and heavy-atom enhancement of triplet yields

Cited by 78 publications

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Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Intense Long-Lived Fluorescence of 1,6-Diphenyl-1,3,5-Hexatriene: Emission from the S<sub>1</sub>-State Competes with Formation of O<sub>2</sub> Contact Charge Transfer Complex

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Photoprocesses in diphenylpolyenes. Oxygen and heavy-atom enhancement of triplet yields

Cited by 78 publications

References 0 publications

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Intense Long-Lived Fluorescence of 1,6-Diphenyl-1,3,5-Hexatriene: Emission from the S&lt;sub&gt;1&lt;/sub&gt;-State Competes with Formation of O&lt;sub&gt;2&lt;/sub&gt; Contact Charge Transfer Complex

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Intense Long-Lived Fluorescence of 1,6-Diphenyl-1,3,5-Hexatriene: Emission from the S<sub>1</sub>-State Competes with Formation of O<sub>2</sub> Contact Charge Transfer Complex