Bindungszustand und Fluoreszenzspektren von Hetero-Excimeren

Rehm, Dieter; Weller, A.

doi:10.1524/zpch.1970.69.3_4.183

Cited by 153 publications

(35 citation statements)

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“…23. Their excellent agreement with the theoretical curve was extended to many other P A pairs by Rehm and Weller (1970b Rehm and Weller (1970a) tested Eq. 14 for a large number of hydrocarbon-dialkylaniline and nitrilehydrocarbon exciplexes in hexane, finding close adherence to a linear relation, Eq.…”

Section: Molecules Primarily Of Photochemical Interestmentioning

confidence: 62%

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: Molecules Primarily Of Photochemical Interestmentioning

confidence: 62%

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

Seely

1978

Photochem & Photobiology

164

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“…In general two non-interacting identical redox centers show a statistical half-wave separation of DE = 35.6 mV at 25 8C. [163,164] This separation increases as the electronic coupling of the degenerate MV states increases and is maximal for a totally delocalized (class III) MV system. In other words, as the electronic coupling increases, the second redox process is increasingly influenced by the first.…”

Section: Bis(hydrazyl) Radical Cationsmentioning

confidence: 99%

Organic Mixed‐Valence Compounds: A Playground for Electrons and Holes

Heckmann¹,

Lambert²

2011

Angew Chem Int Ed

510

495

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Mixed-valence (MV) compounds are excellent model systems for the investigation of basic electron-transfer (ET) or charge-transfer (CT) phenomena. These issues are important in complex biophysical processes such as photosynthesis as well as in artificial electronic devices that are based on organic conjugated materials. Organic MV compounds are effective hole-transporting materials in organic light emitting diodes (OLEDs), solar cells, and photochromic windows. However, the importance of organic mixed-valence chemistry should not be seen in terms of the direct applicability of these species but the wealth of knowledge about ET phenomena that has been gained through their study. The great variety of organic redox centers and spacer moieties that may be combined in MV systems as well as the ongoing refinement of ET theories and methods of investigation prompted enormous interest in organic MV compounds in the last decades and show the huge potential of this class of compounds. The goal of this Review is to give an overview of the last decade in organic mixed valence chemistry and to elucidate its impact on modern functional materials chemistry.

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“…For an estimation of the electron-transfer CHEMPLUSCHEM COMMUNICATIONS properties the measured values were inserted into the RehmWeller equation (Table 1). [16] The cyclic voltammogram of the D-A dyad 1 (see Figure S1 in the Supporting Information) shows the typical reversible oxidation of PT derivatives and two reversible reductions caused by the AQ core. The redox potentials of 1 containing PT and AQ are very similar to those of the reference compounds 2 and 3.…”

mentioning

confidence: 99%