Photochemical hole burning in photoadducts of linear polyacenes

Iannone, Mark A.; Mackay, Richard; Scott, Gary W.; Yamashita, Tomihiro

doi:10.1117/12.18019

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“…Evidence is presented for the formation of stable monomer pairs of s-dipentacene, not only at low temperature, but also at room temperature under high pressure (∼13 kbar). We previously presented preliminary results on the low-temperature photochemistry of s-dipentacene 20 and its use as an in situ source of pentacene monomers. 21 We also have published evidence for low-temperature photochemical hole burning of s-dipentacene in PMMA at 1.5 K. 22 The present paper presents a more detailed study of the low-temperature and high-pressure photochemistry of this molecule.…”

Section: Introductionmentioning

confidence: 99%

s-Dipentacene: Structure, Spectroscopy, and Temperature- and Pressure-Dependent Photochemistry

et al. 1999

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We report the synthesis, characterization, spectroscopy, and photochemistry of s-dipentacene (see Figure ). The symmetric addition product dimer of pentacene (s-dipentacene) is formed upon irradiation of a solution of pentacene. The structure of s-dipentacene was determined by X-ray crystallography. The crystals had a space group symmetry of P1̄ with two molecules per unit cell. One molecule in the unit cell was accompanied by two dichloromethane molecules of solvation. Photodecomposition of s-dipentacene, dispersed in a poly(methyl methacrylate) (PMMA) host matrix, to pentacene was studied. Spectroscopic evidence shows that this photodecomposition proceeds through a trapped intermediate both at low temperature (∼12 K) and at room temperature under high pressure (13 kbar). This intermediate is assigned as a “broken dimer” of two pentacene molecules trapped in the PMMA host. We previously reported similar results in the photolysis of both dianthracene and ditetracene at low temperatures, but this is the first report of broken dimer formation at room temperature under high pressure.

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Section: Introductionmentioning

confidence: 99%