Influence of reaction exothermicity on the persistent spectral hole-burning mechanism in donor—acceptor electron transfer systems

Suzuki, H.; Shimada, Toshiyuki; Hiratsuka, Hiroaki

doi:10.1016/0009-2614(91)80177-y

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…The capability of several molecules with oxidizing properties to support the two-color HB in ZnTBP was already illustrated in Figures and . There has been several attempts to correlate the HB efficiency with the free energy change of electron transfer, , but as a result of the limited number of investigated systems, the results remained inconclusive. The data obtained for a larger number of activators are reported here.…”

Section: Resultsmentioning

confidence: 99%

“…Obviously, the investigation of gated HB may be complicated by the one-quantum prototropic phototransformation in free-base porphyrins, which occurs in H 2 TPP with a high quantum yield (Φ 1 = (1.3 ± 0.5) × 10 -2 56 or 4 × 10 -3 57 ). Unfortunately, the measurements reported in refs −19 are difficult to reproduce since the details of sample preparation are not available in most cases. It is also likely that the light doses have been underestimated.…”

Section: Resultsmentioning

confidence: 99%

“…Rather puzzling gated HB characteristics have been reported for free-base tetraphenylporphine (H 2 TPP) in the presence of halogenated aromatic compounds 16 and p-benzoquinone 18 embedded in a PMMA host polymer (for a review, see ref 19). HB quantum yields with respect to the selective red light (645 nm) (Φ 1 ′) much higher than unity have been obtained.…”

Section: Resultsmentioning

confidence: 99%

“…The paper by Carter et al triggered intensive research of gated hole-burning materials in Japan − and more recently in China. − Unfortunately, as compared to ref , little improvement of hole-burning characteristics has been achieved. The only exception is the azido polymer matrix showing the gating ratio more than 10 3 .…”

Section: Introductionmentioning

confidence: 99%

“…In striking contrast to the conclusions of refs 2-11, the photon gating unequivocally indicates that the photooxidation of metalloporphyrins is a two-quantum process involving the triplet state, similar to classical two-quantum reactions of polycyclic arenes and aromatic amines under ultraviolet excitation. 14,15 The paper by Carter et al 13 triggered intensive research of gated hole-burning materials in Japan [16][17][18][19][20][21][22][23][24][25][26][27] and more recently in China. [28][29][30][31][32][33] Unfortunately, as compared to ref 13, little improvement of hole-burning characteristics has been achieved.…”

Section: Introductionmentioning

confidence: 99%

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Hole-Burning Study of Primary Photochemistry of Metalloporphyrins in Reactive Solvent Glasses

Renge

Wild

1997

J. Phys. Chem. A

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Intermolecular photoprocesses in glassy solutions of magnesium octaethylporphine (MgOEP) and zinc tetrabenzoporphine (ZnTBP) have been investigated under one- and two-color irradiation between 8 and 80 K. The simultaneous exposure to the pulsed laser light in resonance with the 0−0 S1 ← S0 transition and the continuous blue light absorbed by the T n ← T1 transitions leads to a much faster hole burning than the irradiation with the laser light alone. This photon gating effect is observed in many reactive solvent glasses or the mixtures of a reactive component and the inert diluent. In solvent glasses containing electron acceptors (alkyl halogenides, tert-butyl peroxybenzoate, ethyl diazoacetate) the two-quantum photooxidation results in the bleaching of porphyrin absorption bands and formation of cation radical absorption at 650−700 nm (in the case of MgOEP). In the presence of electron donors (triethylamine) and alkenes the photoreaction can be observed only in the hole-burning regime because upon broad-band irradiation the intensity and position of the 0−0 band remain unchanged. The hole burning in these systems stems from sensitized photoprocesses leading to the rearrangement of pigment environment. The microscopic solvent shift of the zero-phonon transition frequency of the pigment following cis − trans isomerization of the alkene molecules or reversible electron transfer results in the formation of a dip in absorption. In this case “antiholes” are observed as a result of intensity redistribution within the 0−0 band. Depending on the height of the triplet level of the alkene, the sensitization can take place by means of triplet energy transfer from either the T n or T1 state (to cyclooctatetraene) of the pigment. The influence of concentration, chemical structure, reduction potential, and the height of triplet energy level of activators as well as the matrix properties on the efficiency of gated hole burning has been investigated. The reactivities of aliphatic halocarbons and amines, aromatic electron acceptors and donors, cyclic and linear olefins with and without electron-accepting substituents, and other compounds have been studied. The most efficient sensitizers have been selected and doped in the polymer films which are more convenient for the applications of spectral hole burning in optical data storage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hole-Burning Study of Primary Photochemistry of Metalloporphyrins in Reactive Solvent Glasses

Renge

Wild

1997

J. Phys. Chem. A

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Information Storage Materials, Optical

Kämpf¹,

Mergel²

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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In addition to the established magnetic mass storage media (floppy disk, hard disk, tape) optical mass storage media (CD‐ROM (compact disk‐read only memory), WORM (write once, read many times), EOD (erasable optical disk)) are increasingly used. Generally, magnetic and optical media do not compete, but complement each other due to their specific advantages. Progress in optical data storage technology is closely connected with the development of suitable materials. This article illustrates in detail the current state of the art and the ongoing development of materials for optical data storage. For the information layer of WORM disks, dyes with high ir absorption, low heat conductivity, and good solubility are required. Besides polymethine dyes, biaxially substituted silicon–naphthalocyanines are used; also combinations of metal complexes are employed. The magneto‐optical materials for EOD‐disks in MOR (magneto‐optical recording) technique are primarily ferrimagnetic ternary amorphous alloys of rare‐earth (RE) and transition‐metals (TM) (GdTbFe, TbFeCo, DyFeCo). Ferrites with spinel‐ or garnet‐structure, eg, rare‐earth iron‐garnets (RIG), are commercially unimportant mainly due to their high deposition temperature. Co/Pt‐multilayers (MLs) exhibit interesting properties, but are still waiting for commercial introduction. Research concentrates on exchange‐coupled RE‐TM layers, which permit a direct overwrite procedure. Phase‐change materials for EOD‐disks in PCR (phase‐change recording) technique are primarily ternary alloys (eg, GeSbTe, InSbTe). Research focuses on materials with fast crystallization in parallel with high stability even at numerous write/read/erase cycles. As substrate materials for CD‐ROM disks, end group‐modified bisphenol A–polycarbonate (BPA‐PC) is employed exclusively. For WORM and EOD disks mainly BPA‐PC and sometimes glass is applied.

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High efficiency persistent spectral hole‐burning materials

Suzuki

1993

Advanced Materials

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Persistent spectral hole‐burning (PSHB) materials based on donor–acceptor electron transfer have promising characteristics for future memory applications, i.e. high recording speed and high recording density, that cannot be matched by conventional PSHB materials. Novel PSHB materials are described in which spectral holes can be burnt on nanosecond or sub nanosecond time scales. A materials design guideline for optimizing donor‐acceptor combinations is presented and goals of future work are discussed.

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Influence of reaction exothermicity on the persistent spectral hole-burning mechanism in donor—acceptor electron transfer systems

Cited by 8 publications

References 25 publications

Hole-Burning Study of Primary Photochemistry of Metalloporphyrins in Reactive Solvent Glasses

Hole-Burning Study of Primary Photochemistry of Metalloporphyrins in Reactive Solvent Glasses

Information Storage Materials, Optical

High efficiency persistent spectral hole‐burning materials

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