Terphenyls numbering systems

Various numbering systems of the terphenyl nucleus have been used in the reviewed literature, so that a different number may refer to the same substituent position, as assigned by Authors. 

Although many hydrocarbons exhibit fluorescence, often they are colourless and the fluorescence is only just into the blue, e.g. the linear terphenyl and quaterphenyl. Polycyclic ring systems such as terrylene and rubicene are used in analytical methods and OLEDs but a large number are ruled out of commercial use because of their potential to act as carcinogens. However, as mentioned in section 3.5.1.3, pery-lene is a useful fluorophore in a variety of outlets and pyrene is another polycyclic compound of interest. One derivative of pyrene (3.27) is a yellow-green fluorescent dye used in textile applications (Cl Solvent Green 7) and in analysis and sensors (see section 3.5.6.4). 

Under Monsanto s Aroclor nomenclature system, each Aroclor is assigned a four digit number. The last two digits indicate the approximate percentage weight of chlorine in the product and the first two digits indicate the type of material as follows 12—chlorinated biphenyls 25—blend of chlorinated biphenyls and chlorinated terphenyls (75 25) 44—blend of chlorinated biphenyls and chlorinated terphenyls (60 40) and 54—chlorinated terphenyls. 

ODMR-type methods. The answer is affirmative [7, 8] and in this contribution we discuss a number of results on the system pentacene doped into a p-terphenyl host crystal (see Fig. 1) which demonstrate that such experiments are feasible and that it is possible to extract information about a single molecular spin and its interaction with its environment and the resonant radiation field. 

A vast number of liquid crystals showing nematic or other mesophases are obtained using benzene, biphenyl or terphenyl units as core systems, often with the rings connected by polarizable linkages such as ester or alkynyl functions or direct-... 

A large number of aromatic hydrocarbon radical anions has been reacted with Wurster s Blue-type radical cations, e.g. the radical anions of 1-phenylnaph-thalene, 8,8 -dimethyl-naphthalene, 1,1 -binaphthyl, p-terphenyl, chrysene, 1,2-dimethylchrysene [29]. They all represent energy-deficient systems, so that triplet-triplet annihilation had to be regarded as the mechanism for the production of the emitting singlet state. The quantum yields were in the range 10" to 10" Einstein/mol [29]. 

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