Tetracene absorption spectrum

Figure 5 (a) Absorption (a) and emission (PL) polarized spectra of tetracene b and Lb Davydov splitting components of a tetracene single crystal seen in the absorption spectrum of a polycrystalline tetracene layer (upper full curve) as double features at 505 and =520 nm the PL spectrum (1) as measured, the PL spectrum (2) corrected for the spatial distribution of excitons in the crystal as shown in part (b). (b) The spatial distribution of singlet excitons [fix)] in a 4.7 pm-thick tetracene single crystal, obtained according to the procedure described elsewhere [53] (see also Sec. 3.1). 

Absorption spectrum (cont.j silabenzene, 105, 107 substituted benzenes, 115-17 tetracene, 72, 103... 

Temperature dependence, photophysical processes, 302-3 stereoselectivity, 326-27 Telra-t-butyltetrahedrane. 385 Tetracene, 254 absorption spectrum, 72, 103 Tetracene radical anion and cation. 103 Tetracycioociene, 423 Tetramethylcyclobutane, 406 TetramethyM,2-dioxeiane, 428. 482-83 Tetrameihylethyiene, 326-27 Tetranitromethane, 465 n.a.a a -Tetraphenylbenzocyclobuiene,... 

Monoclinic plates from ale. Sublimes. When pure, colorless with violet fluoresence when impure (due to tetracene, naphthacene), yellow with green fluorescence. Strongly triboluminescent and triboelectric. dj 1.25. mp 218. bp,M 342. Absorption spectrum Clar, Ber. 65, 506(1932). Less soluble than the isomeric phenanthrene. Insol in water one gram dissolves in 67 ml abs alcohol, 70 ml methanol, 62 ml benzene, 85 ml chloroform, 200 ml ether, 31 ml carbon disulfide, 86 ml carbon tetrachloride, 125 ml toluene. Anthracene darkens in sunlight. According to Downs, U.S. pat. 1,303.639 (1919), when solns of crude anthracene in coal tar naphtha are exposed to ultraviolet irradiation, the anthracene is precipitated as dianthracene (para-anthracene) which is reconverted to anthracene by sublimation. 

Monoclinic prismatic tablets from alcohol or by sublimation. da 1.271. Pure pyrene is colorless, the usual contaminant which gives it a yellow color is tetracene. Solid and solns have slight blue fluorescence, mp 156. bp 404. Absorption spectrum Clar. Ber. 69, 1677 (1936) Seshan, Proc, Indian Acad. ScL A3, 148 (1936). Fluorescence maxi, ma Sannie, Poremski, Bull. Soc. Chim. [5] 3, 1139 (1936). Inso in water fairly sol in organic solvents. 

Figure 2.25. Absorption spectra of the radical anion (—) and the radical cation (...) of tetracene in comparison with the spectrum of tetracene ( ) (by permission from DMS-UV-Atlas 1966-71).

We have recorded the absorption bands and EPR spectrum which appear on contact of gaseous napthalene, anthracene, perylene, and tetracene under vacuum with the degassed surface of silica-alumina gels of different compositions 78, 78a, 110). A similar research with concordant results, has been recently reported by Hall (80a) for evacuated anthracene, perylene, pyrene, and 3,4-benzopyrene solutions in isooctane in which the adsorbent was immersed. 

---