title: 4-(9,10-Dihydroacridin-9-ylidene)thiosemicarbazide and its five-membered thiazole and six-membered thiazine derivatives.
abstract: Two methyl derivatives, five-membered methyl 2-{2-[2-(9,10-dihydroacridin-9-ylidene)-1-methylhydrazinyl]-4-oxo-4,5-dihydro-1,3-thiazol-5-ylidene}acetate, C(20)H(16)N(4)O(3)S, (I), and six-membered 2-[2-(9,10-dihydroacridin-9-ylidene)-1-methylhydrazinyl]-4H-1,3-thiazin-4-one, C(18)H(14)N(4)OS, (II), were prepared by the reaction of the N-methyl derivative of 4-(9,10-dihydroacridin-9-ylidene)thiosemicarbazide, C(14)H(12)N(4)S, (III), with dimethyl acetylenedicarboxylate and methyl propiolate, respectively. The crystal structures of (I), (II) and (III) are molecular and can be considered in two parts: (i) the nearly planar acridine moiety and (ii) the singular heterocyclic ring portion [thiazolidine for (I) and thiazine for (II)] including the linking amine and imine N atoms and the methyl C atom, or the full side chain in the case of (III). The structures of (I) and (II) are stabilized by N-H...O hydrogen bonds and different pi-pi interactions between acridine moieties and thiazolidine and thiazine rings, respectively.
authors.affiliation: Institute of Chemistry, Faculty of Science, P.J. Safárik University, Moyzesova 11, SK-041 54 Kosice, Slovakia. ivan.potocnak@upjs.sk
authors.forename: Ivan
authors.initials: I
authors.lastname: Potocnák
authors.forename: Ján
authors.initials: J
authors.lastname: Imrich
authors.forename: Ivan
authors.initials: I
authors.lastname: Danihel
authors.forename: Jozef
authors.initials: J
authors.lastname: Koaeísek
authors.forename: Karel Douglas
authors.initials: KD
authors.lastname: Klika