Anthracene-ammonia adduct

Jet cooling may reveal weakly fluorescing systems, since some non-radiative decay processes become less efficient in that environment, particularly bimolecular interactions. Thus, exciplexes formed between aromatic molecules acceptors and tertiary amine donors have long been known to fluoresce, whereas under ambient conditions exciplex emission from pairs in which the tertiary amine has been replaced by a secondary of primary amine is rare. Anner and Haas observed exciplex emission from an anthracene-ammonia adduct in a jet [40] and Drescher et al. [41] reported weak exciplex emission from a /i-methylstyrene-diethylamine adduct... 

The simplest model uses atom-atom pairwise potentials, as was done for clusters of molecules with rare gas atoms [45] and with other molecules [46]. The Haas group suggested such models for the anthracene- and perylene ammonia adducts, in which an electrostatic interaction [47] was added to account for the charge distribution in the molecules [40], and also as for the larger donors (dimethylaniline). The potential is written as... 

Magnesium reacts with naphthalene and higher polycyclic aromatics in liquid ammonia or HMPA to form the radical ion. Adducts with anthracene and substituted anthracenes form in THF. Depending upon substitution and conditions, they have a variety of structures. The l,10-bis(trimethylsilyl) compound had structure (47) in the crystal, with magnesium bridging the 1,10-positions (C-Mg =... 

HEP readily reacts with hydrogen, chlorine, and bromine (but not iodine), by an addition reaction similar to other olefins [57-59]. Similarly, HE, HCl, and HER (but not HI), add to HEP. By reacting HEP with alcohols, mercaptans, and ammonia, hexafluoro ethers (CF3CFHCF20R), hexafluoro sulfides (CF3CFHCF2SR), and tetrafluoropropionitrile (CF3CFHCN) are obtained. Diels-Alder adducts have been identified fi om the reaction of anthracene, butadiene, and cyclopentadiene with HEP. Cyclic dimers of HEP can be prepared at 250-400°C under autogenous pressure [49]. Linear dimers and trimers of HEP can be produced catalytically in the presence of alkali metal halides in dimethylacetamide [48]. 

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