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Vanadium Induced Cyclization of Thiosemicarbazone : Formation of Heptanuclear Mixed Valence V(IV)/V(V) Complex (CROSBI ID 540976)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Rubčić, Mirta ; Đilović, Ivica ; Cindrić, Marina ; Matković-Čalogović, Dubravka Vanadium Induced Cyclization of Thiosemicarbazone : Formation of Heptanuclear Mixed Valence V(IV)/V(V) Complex // 6th International Vanadium Symposium : Book of Abstracts / da Costa Pessoa, Joao ; Tomaz, Isabel ; Goncalve, Gisela et al. (ur.). Lisabon: Academic Press, 2008. str. P26-P26

Podaci o odgovornosti

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

engleski

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

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.

thiosemicarbazones; cyclization; vanadium complexes

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Podaci o prilogu

P26-P26.

2008.

objavljeno

Podaci o matičnoj publikaciji

6th International Vanadium Symposium : Book of Abstracts

da Costa Pessoa, Joao ; Tomaz, Isabel ; Goncalve, Gisela ; Gama, Sofia

Lisabon: Academic Press

Podaci o skupu

International Vanadium Symposium (6 ; 2008)

poster

17.07.2008-19.07.2008

Lisabon, Portugal

Povezanost rada

Kemija