Porphyrins

Seybold, Paul G.; Gouterman, Martin

doi:10.1016/0022-2852(69)90335-x

Cited by 667 publications

(480 citation statements)

References 19 publications

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“…References: (1) Stanienda (1965); (2) Borg et al (1970); (3) Kutyurin et al (1966); (4) Saji and Bard (1977); (5) Barboi and Dilung (1969); (6) Kiselev et al (1970); (7) Kazakova et af. (1976); (8) Stanienda and Biebl (1967); (25) Wolberg and Manassen (1970); (26) Kadish and Morrison (1976); (27) Toke1 et al (1972); (28) Tezuka et al (1976); (29) Felton and Linschitz (1966); (30) Peychal-Heiling and Wilson (1971); (31) Clack and Hush (1965); (32) Quimby and Longo (1975); (33) Seybold and Gouterman (1969) (1977); (54) In a companion paper (Seely, 1969b), a plot of quenching constants for pyrochl against reduction potentials of the same nitro compounds was interpreted in terms of a model in which quenching required a favorable arrangement of solvent molecules. Analysis of the results implied that U") = 0 when Eh = -0.74, which, when introduced into the condition (1 2) for fluorescence quenching, gives…”

Section: Chlorophylls and Porphyrinsmentioning

confidence: 99%

The Energetics of Electron‐transfer Reactions of Chlorophyll and Other Compounds*

Seely

1978

Photochem & Photobiology

164

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Abstract-Quite often the primary photochemical reaction of an excited state molecule is transfer of an electron to or from another molecule in its ground state. Rates of such reactions are closely dependent on differences between ground and excited state redox potentials of the reagents. The solvent also plays an important role in stabilizing ion pairs formed by the electron transfer. This Review discusses experimental data relating rates to electrochemical energy parameters in the context of a scheme which portrays the energy and electron transactions in a unified manner. Three consequences of reaction of a singlet excited state are distinguished: (Sl) quenching without detectable products, (S2) exciplex fluorescence, (S3) transient radical ion production, and energetically necessary conditions are derived for each. Similarly, four kinds of reactions involving the triplet state are distinguished, which depend on the relation between the energy of the triplet state and that of the ion pair states: (TI) rapid quenching, (T2) slow quenching, (T3) accelerated intersystem crossing and (T4) generation by reaction between radical ions 'of like spin. The last may be followed by electrochemiluminescence. Classes of compounds for which data are available include chlorophylls, porphyrins and a few other molecules of biological interest, aromatic hydrocarbons and their derivatives, heterocyclic systems, carbonyl compounds, dyes, and complexes of Ru and U. A Table compiling median or selected values of ground and excited state electrochemical potentials of chlorophylls, some porphyrins, and a few other compounds is presented.

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Section: Chlorophylls and Porphyrinsmentioning

confidence: 99%

The Energetics of Electron‐transfer Reactions of Chlorophyll and Other Compounds*

Seely

1978

Photochem & Photobiology

164

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“…em for tetraphenylporphyrin is 0.11. 3 All relative fluorescence quantum yields were calculated based on the corresponding fluorescence spectra of the samples and the standard according to the equation [4][5][6] : where Φ em (s) and Φ em (x) are the relative fluorescence quantum yield of the standard and sample, respectively; A s and A x are the absorbance at the excitation wavelength for the standard and sample, respectively; F s and F x are the area under the corrected emission curve for the standard and sample, respectively; and s and x are the refractive index of the solvent used for the standard and sample, respectively. Mass Spectrometry.…”

Section: Preparation Of 1-ga-tiomentioning

confidence: 99%

Decorating Metal Oxide Surfaces with Fluorescent Chlorosulfonated Corroles

Blumenfeld

Grubbs²,

Moats

et al. 2013

Inorg. Chem.

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ExperimentalMaterials. 2 M AlMe 3 in toluene (Aldrich), GaCl 3 (Aldrich), HSO 3 Cl (Aldrich), 21 nm nanopowder TiO 2 (Aldrich), 30% H 2 O 2 (EMD) were obtained commercially and used as received. The starting material 5,10, corrole (H 3 tpfc) was prepared based on the literature method.1 The solvents pyridine and toluene were dried over a column. Acetone and dichloromethane used were both of reagent and spectroscopic grades depending on the applications.Chemical Preparation. All preparations were carried out under Ar(g) atmosphere unless otherwise noted. ,17-bischlorosulfonato-5,10,15-tris(pentafluorophenyl) corrole (H 3 tpfc(SO 2 Cl) 2 ; 1) was performed according to the literature procedure. 2 The metallocorroles described in this study were prepared in the following manner. Corrole Preparation. Preparation of 2 Preparation of 1-Al.To the 20-mL toluene solution of 0.32 g of 1 (0.32 mmol) in a round bottom flask was added 0.8 mL of 2 M AlMe 3 (1.6 mmol) in toluene solution at an icebath temperature. The solution was stirred for 10 min followed by the addition of 1 mL anhydrous pyridine. The solution was allowed to stir for another 10 min over ice. The reaction was quenched by an addition of ice chips. The dark green solution was then extracted with CH 2 Cl 2 and washed with water. The solvent was removed in vacuo and the dry deep green solid was redissolved in CH 2 Cl 2 followed by filtration. The filtrate was brought to dryness to afford the dark green solid (0. Preparation of 1-Ga.To a heavy-walled Schlenk flask were added 0.20 g of 1 (0.20 mmol) and 0.57 g GaCl 3 (3.3 mmol) under Ar(g). The flask was chilled in N 2 (l) and evacuated. 15 mL Degassed anhydrous pyridine (15mL) was added to the flask via vacuum transfer. The

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“…The equality has been shown to hold for a number of aromatics [52][53][54][55][56][57] and for porphin and its de rivatives [58] . Exceptions abound, however , [59] and the experimental situation is still unclear [60]. Accurate a nd exte nsive quantum-yield measurements are ne cessary in order to establish or refute the stated equality as a fundamental (or rarely violated) law of lumin escence.…”

Section: The Importance Of the Quantum Efficiencymentioning

confidence: 99%

Absolute quantum efficiencies

Crosby

Demas

Callis

1972

J. RES. NATL. BUR. STAN. SECT. A.

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Recent deve lop ments in severa l areas of chem istry, laser technology, photod etector in strum e ntation, a nd calorim etry are su rveyed , and thei r probable impact on th e measurement of quantum yi elds is assessed. C he mical developments incl ude: (a) synthesis a nd design of ne w luminesce nt mol ecul es that cou ld possi bl y serve as standards, (b) a pplication of improved se pa ration techniques to provide sam pl es of extreme purity, and (c) advances in photoch",m istry that port e nd th e developm e nt of widera nge c he mical actinomete rs. Th e potential use of lase rs in qu antum-yield meas ure ments and th eir adva ntages ove r co nve ntional so urces for ap plication in both opti cal and calorim etric te c hniques are pointed out. New methods of quantum-yield meas urements, based o n the novel c harac te ristics of lase r pump sou rces, a re suggested, in cl udin g th e feasibility of meas urin g yields unde r time-reso lve d co nditions and of employing internal standards. The poss ible liftin g of wavelength restri ctions on both laser so urces a nd de tector devices a nd the impli cation s of these de ve lopments for exte ndin g the spec tral range of quantum-yield measurements are discussed. The c urre nt status of calorim e try for dete rminin g yield s is surveyed , and th e impact of rece nt te c hnology on the feas ibility of deve loping ca lorim e tric method s com pe titive with opti cal me thods is assessed.Key words : Calorime try in quantum yields; laser, use in quantum yie lds; photodetectors in quantum yields; quantum effi cienc ies_

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Porphyrins

Cited by 667 publications

References 19 publications

The Energetics of Electron‐transfer Reactions of Chlorophyll and Other Compounds*

The Energetics of Electron‐transfer Reactions of Chlorophyll and Other Compounds*

Decorating Metal Oxide Surfaces with Fluorescent Chlorosulfonated Corroles

Absolute quantum efficiencies

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