Anthracene and Related Heterocyclic Derivatives

Folding of the molecule is also a feature of many heterocyclic analogues of phenanthrene and of reduced phenanthrene derivatives. Thus, two derivatives of acridine, 2-[2-(6-chloro-2-methoxy-9-acaidinylamino)ethyl-aminojethanol (ICR-171-OH) (42a) and the closely related compound 

Methylme Blue hydrochloride (45), studied as the pentahydrate, contains sheets of Methylene Blue molecules with the chloride ions associated with the terminal nitrogen atoms. There is also a clathrate-like network of water molecules perpendicular to the planes formed by the phenazathionium 

10-Epoxy-, 5,10-epithio-, 5,10-episeleno-, and 5,10-epitelluro-5,10-dihydroarsanthren (46) form a eutropic series, having many physical and 

Flavins have also been extensively examined, including Lumazine (47), derivatives of which have been shown to be intennediates in the biosynthesis of flavins. 9-Bromo-l,3,7,8,10-pentamethyl-l,5-dihydroisoalloxazine (48)  

Several flavin derivatives have also been studied as molecular complexes. The structure of the complex formed between lumiflavinium bromide (52)  

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