ON THE ORIGIN OF 628 nm FLUORESCENCE IN CERTAIN CHLOROPHYLL PREPARATIONS

Seely, G. R.

doi:10.1111/j.1751-1097.1992.tb04244.x

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Bearing in mind that the propionate and butyrate salts of quaternary ammonium ions have often been used to make inverted rnicelles in non-polar media (Fendler and Fendler, 1975), we decided to test the effect of carboxylates on the state of aggregation of Chl on PEitd particles, with the results reported here. In a separate Note, the fourth and fifth of the anomalous properties listed above will be discussed (Seely, 1992).…”

Section: Introductionmentioning

confidence: 99%

Dodecylpyridinium Alkanoates Stabilize Dispersed Chlorophyll

Seely

Rehms

1992

Photochem & Photobiology

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In the presence of a surfactant that does not ligate Mg, chlorophyll is adsorbed to polyethylene particles swollen with tetradecane principally as the infrared-absorbing, highly polymeric species Chl 740. Examples of such surfactants are quaternary ammonium salts and soaps. However, when surfactants of opposite charge are present together, in this case dodecylpyridinium iodide and Na butyrate or myristate, chlorophyll may exist entirely in a dispersed form absorbing around 666 nm. Absorption and fluorescence spectral data show that much of the dispersed pigment is still associated, but as dimeric and perhaps short oligomeric species. It is concluded from fluorescence lifetime analysis that most of the observed fluorescence comes from a small population of chlorophyll that is probably monomeric and isolated; fluorescence of more highly associated species decays with a wide range of lifetimes. The capacity for photochemical sensitization of these particles with dispersed chlorophyll is similar to that of particles with ligating surfactants examined earlier. Structures are suggested for chlorophyll association in which Mg is ligated by water hydrogen-bonded to a carboxylate group, while the dodecylpyridinium counterion lies near the chlorophyll ring. The effect of the two surfactants is synergistic. Overall, spectra of dispersed chlorophyll adsorbates resemble most closely those of colloidal chlorophyll suspensions prepared by dilution of solutions in polar organic solvents with water.

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Section: Introductionmentioning

confidence: 99%

Dodecylpyridinium Alkanoates Stabilize Dispersed Chlorophyll

Seely

Rehms

1992

Photochem & Photobiology

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Peroxidase-catalysed chlorophyll destruction accompanied by the formation of electronically excited states: chlorophyll emission not due to energy transfer from excited substrate metabolites

Baader¹,

Gillo²

1996

Journal of Photochemistry and Photobiology A: Chemistry

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Excited-State Dynamics of 5,10,15,20-Tetraphenyl- 21H,23H-porphine Manganese(III) Chloride Encapsulated in TiMCM-41 and MCM-41; Proved by fs-Diffuse Reflectance Laser Photolysis

et al. 2001

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5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride (MnIIITPP(Cl)) was encapsulated into MCM-41 and TiMCM-41, and its photoinduced electron transfer had been studied by using femtosecond diffuse reflectance photolysis. Two different transient species (c.a. 10 ps and c.a. 80 ps) were observed. The shorter-lived species should be originated from relaxation of a “tripmultiplet” state and the longer-lived species should be attributed to the spin-forbidden relaxation (slower than the spin-allowed decay of triptquintet) via a quintet CT state. After irradiation, MnTPPCl+• radicals are detected in MCM-41 or TiMCM-41, indicating that the mesoporous silicate framework plays a good electron acceptor. Furthermore, it has been found that the formation MnTPPCl+• is easier in TiMCM-41 than in MCM-41, indicating that framework modification by incorporating the Ti4+ into the MCM-41 enhances the electron-accepting ability of the MCM-41 framework.

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ON THE ORIGIN OF 628 nm FLUORESCENCE IN CERTAIN CHLOROPHYLL PREPARATIONS

Cited by 4 publications

References 29 publications

Dodecylpyridinium Alkanoates Stabilize Dispersed Chlorophyll

Dodecylpyridinium Alkanoates Stabilize Dispersed Chlorophyll

Peroxidase-catalysed chlorophyll destruction accompanied by the formation of electronically excited states: chlorophyll emission not due to energy transfer from excited substrate metabolites

Excited-State Dynamics of 5,10,15,20-Tetraphenyl- 21H,23H-porphine Manganese(III) Chloride Encapsulated in TiMCM-41 and MCM-41; Proved by fs-Diffuse Reflectance Laser Photolysis

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