✦ LIBER ✦

The polarization of the allowed triplet-triplet absorption in anthracene

✍ Scribed by Robin M. Hochstrasser; Alfred P. Marchetti

Publisher: Elsevier Science
Year: 1968
Tongue: English
Weight: 151 KB
Volume: 1
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(68)85056-0

No coin nor oath required. For personal study only.

✦ Synopsis

In this note we report the polarization of the well known triplet-trip@ absorption of anthracene in the 4500 -4100 A region and the assignment for the total space symmetry of the upper state. The short lifetime of the anthracene lowest triplet state makes this determination slightly more difficult than are polarization measurements on the longer lived (oriented) triplets.

The spectra were obtained using single crystals of benzophenone which had been doped with anthracene. This technique was used previously [I] to study the polarization of triplet-triplet bands, but in the earlier work only the rather ambiguous (110) face of benzophenone was employed (and the temperature was just 77OK). The crystals were grown from an ethanol solution and the faces were identified from their habit and by conoscopic techniques. The recent crystal structure determination of benzophenone [2] provides 'the required molecular orientations, and meas-

📜 SIMILAR VOLUMES

Polarized excitation spectrum of the tri

Polarized excitation spectrum of the triplet - triplet absorption of aromatic hydrocarbons

✍ D. Lavalette 📂 Article 📅 1969 🏛 Elsevier Science 🌐 English ⚖ 309 KB

The polarized excitation spectrum of the triplet-triplet absorption of some hydrocarbons has been measured by the method of photoselection. Advantages offered by the polarized excitation spectrum for further polarization work are briefiy discussed.

Further results on the triplet—triplet f

Further results on the triplet—triplet fluorescence of anthracenes

✍ Gregory D. Gillispie; E.C. Lim 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 457 KB

## Triplet-triplet fhrorescence spectra have been measured following excitation into the St state for eight anthraccnes For those molecules in which near-infrared 3Bau -3B,o absorption has been reported, the @-0 band wavelength in absorption and fluorescence agrees well. Hoaever. the quantur?i yie

Triplet-triplet absorption of 2-(2′-hydr

Triplet-triplet absorption of 2-(2′-hydroxyphenyl) benzoxazole (HBO) in polar solvents

✍ Guoqiang Yang; Fabrice Morlet-Savary; Zhaokui Peng; Shikang Wu; Jean-Pierre Foua 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 437 KB

The transient T-T absorption spectra of 2-(2'-hydroxyphenyl) benzoxazole (HBO) have been measured in liquid polar solvents and in polymethylmathacrylate. In non-protonic polar solvents the main T-T absorption is from the keto form of the compound (3K \* ). With a triplet sensitizer the compound just

Polarization of the triplet-triplet abso

Polarization of the triplet-triplet absorption spectrum of picene in the 3750 to 15 800 Å region

✍ T.G. Pavlopoulos 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 246 KB

Tne triplet-triplet absorption spectrum and its polarization of picene were measured from 3750 to 15 800 A. &sides the strong transition at about 6300 A, two others are located at 4875 and 9300 A. These experimental data were compared with calculated results obtiined by Orloff The triplet-triplet

Phosphorescence and triplet-triplet abso

Phosphorescence and triplet-triplet absorption spectra of anthracene-d10 in polymethylmethacrylate under high pressures

✍ Robert W. Shaw; Malcolm Nicol 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 486 KB

The phosphorescence, 3L,-3Ka absorption, and 3La-3Ca absorption spectra of anthracenedto in polymethylmethacryIate have been observed at pressures as great as 25 kbar at room temperature. These results with earlier measurements of the pressure dependence of the '4 absorption spectrum confirm that t

Magnetic resonance studies of optical sp

Magnetic resonance studies of optical spin polarization in triplet state anthracene

✍ Richard H. Clarke 📂 Article 📅 1970 🏛 Elsevier Science 🌐 English ⚖ 494 KB

EPR studies of the lowest triplet state of anthracene in a phenazine host crystal reveal a non-Boltzmann distribution over the triplet spin levels at zl.5OK. Measurements of the lifetimes for each of the triplet spin states provide information about both intramolecular decny processes and intermolec