Tetracenes

Overney R, Howald L, Frommer J, Meyer E and Guntherodt H 1991 Molecular surface structure of tetracene mapped by the atomic force microscope J. Chem. Phys. 94 8441... 

S. M. Kaye, "Tetracene," Enyclopedia of Explosives and Relateditems, Vol. 6, G169 PATR 2700, ARDEC, Dover, N.J. 

In Group 14 (IV), carbon serves as a Lewis base in a few of its compounds. In general, saturated ahphatic and aromatic hydrocarbons are stable in the presence of BF, whereas unsaturated ahphatic hydrocarbons, such as propjdene or acetylene, are polymerized. However, some hydrocarbons and their derivatives have been reported to form adducts with BF. Typical examples of adducts with unsaturated hydrocarbons are 1 1 adducts with tetracene and 3,4-benzopyrene (39), and 1 2 BF adducts with a-carotene and lycopene (40). 

Polarography, a well known electroanalytical technique, is currently being used to detn the purity of Tetracene as well as other compds contg nitrate and nitroso groups (Ref 38). 

CAHN RG ELECTROBALANCE/SEDIMENTATION ACCESSORY. This app produces a continuous, visible chart record of the sediment weight collected on the balance pan. It has been evaluated for measuring particle size distributions of the primary expls Lead Styphnate, Lead Azide, Tetracene by Hutchinson (Ref 41). 

Four samples of Lead Styphnate were analyzed by dispersing in acet and were found to have average diameters of 15.9 y with a standard deviation of 0.4p. The reproducibility for Tetracene, with average diameter of 35 y, was 2y. Methanol was found to be a satisfactory dispersant for Lead Azide with average particle diameter of 12y... 

Figure 14. Absorption curves of the tetracene radical ions (157) and results of the semiempirical open-shell PPP-like calculations (59). The latter are indicated by vertical lines (allowed transitions) and by wavy lines with arrows (forbidden transitions) f stands for theoretical oscillator strength.

In the case of the photoaddition of anthracene derivatives and tetracene, the cross-dimer is the major product isolated in all cases even when anthracene itself is used. 

Aromatic compounds in the series, benzene, napthalene, anthracene, tetracene, etc., form crystals. However, benzene melts below room temperature. Napthalene, although solid at room temperature, has a high vapor pressure. Therefore, the first in the series whose crystals are stable enough at room temperature for extensive hardness studies is anthracene. 

A synthesis of highly-substituted tetracenes was developed starting from isoindole (benzo[c]pyrrole) <06OL273>. For example, treatment of dibromonaphthalene 87 with phenyllithium in the presence of isoindole 86 followed by deamination of the intermediate cycloadduct provided tetracene 88. Separately, the synthesis and cycloaddition chemistry of oxadisilole-fused isoindoles was investigated <06SL2510>. 

A general theory of the aromatic hydrocarbon radical cation and anion annihilation reactions has been forwarded by G. J. Hoytink 210> which in particular deals with a resonance or a non-resonance electron transfer mechanism leading to excited singlet or triplet states. The radical ion chemiluminescence reactions of naphthalene, anthracene, and tetracene are used as examples. 

The first photochemical reactions to be correlated with PMO theory were the dimerizations of anthracene, tetracene, pentacene, and acenaphthylene. 36> More detailed energy surfaces for the photodimerization reactions of butadiene have also been calculated. 30> In the category of simplified calculations lie studies of the regiospecificity of Diels-Alder reactions 37>, and reactivity in oxetane-forming reactions. 38,39) jn these... 

Eisenbrand, J., Baumann, K. (1970) Uber die bestimmung der wasserloslichkeit von coronen, fluoranthen, perylen, picen, tetracen und triphenylen und tiber die bildung wasserloslicher komplexe dieser kohlenwasserstoffe mit coffein. Zeitschrift far Lebensmittel Untersuchung und Forschung 144, 312-317. 

A wide variety of different classes of fluorescent molecules has been investigated in the peroxyoxalate chemiluminescent systems. Among those screened were fluorescent dyes such as rhodamines and fluoresceins, heterocyclic compounds such as benzoxazoles and benzothiazoles, and a number of polycyclic aromatic hydrocarbons such as anthracenes, tetracenes, and perylenes. The polycyclic aromatic hydrocarbons and some of their amino derivatives appear to be the best acceptors as they combine high fluorescence efficiency with high excitation efficiency in the chemiluminescent reaction [28],... 

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