Naslov
Vanadium Induced Cyclization of Thiosemicarbazone : Formation of Heptanuclear Mixed Valence V(IV)/V(V) Complex

Autori
Rubčić, Mirta ; Đilović, Ivica ; Cindrić, Marina ; Matković-Čalogović, Dubravka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
6th International Vanadium Symposium : Book of Abstracts / Da Costa Pessoa, Joao ; Tomaz, Isabel ; Goncalve, Gisela ; Gama, Sofia - Lisabon : Academic Press, 2008, P26-P26

Skup
International Vanadium Symposium (6 ; 2008)

Mjesto i datum
Lisabon, Portugal, 17.07.2008. - 19.07.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
thiosemicarbazones; cyclization; vanadium complexes

Sažetak
Thiosemicarbazones, a small organic molecules which belong to a family of thiourea derivatives, are associated with various biological activities including antibacterial, antiviral and antitumor. As ligands, they can coordinate to metal ions in diverse manners due to the number of mixed soft-hard donor atoms and conformational flexibility. Furthermore, under the influence of metal cations as oxidants they can easily undergo ring closure process affording variety of heterocyclic rings. Data in the literature reveal that various metal cations, such as Ag(I), Zn(II), V(IV) etc., are capable of inducing cyclization reactions of thiosemicarbazone or related dithiocarbazate systems. We have investigated the reactions of oxovanadium(IV) acetylacetonate and salicylaldehyde 4-phenylthiosemicarbazone (H2L) in the presence of different bases (imidazole, 4-picoline and pyridine) under inert atmosphere. When imidazole (im) or 4-picoline (4-pic) were used mononuclear vanadium(IV) complexes, [VO(L)(im)] and [VO(L)(4-pic)] were obtained. Interestingly, in the case of pyridine we isolated previously reported thiazoline compound and polinuclear mixed-valence V(IV)/V(V) complex, [V7O14(Lcycl)3(py)3] . In the polinuclear complex with unprecented [V7O14]3- core, vanadium atoms are coordiated by bridging ligands containing 1, 2, 4-thiadiazole ring, as a product of vanadim induced oxidative cyclization, and pyridine as ancillary ligands.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA