Synthesis of novel substituted 6a lambda(4)-thia-1,6-diazapentalenes and their complexation behaviour toward sodium(I), silver(I) and mercury(II)

Herein we describe the synthesis of novel substituted 6a gimel (4)-thia-1,6 -diazapentalenes by a base-induced dimerisation of two isothiazolium salts. It was possible to introduce benzo crown ether substituents for the first time according to the well established reaction procedure for the synthesis of the thiadiazapentalenes. The complex formation behaviour of the 6a gime l (4)-thia-1,6-diazapentalenes towards Ag(I), Hg(II) and Na(I) in solution was studied in terms of the influence of several substituents. The combinat ion of 6a gimel (4)-thia-1,6-diazapentalenes with benzo crown ether substit uents results in a simultaneous binding of one hard and one soft metal ion by one molecule.