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Pregled bibliografske jedinice broj: 429796

Vanadium-induced formation of thiadiazole and thiazoline compounds. Mononuclear and dinuclear oxovanadium(V) complexes with open-chain and cyclized thiosemicarbazone ligands


Rubčić, Mirta; Milić, Dalibor; Horvat, Gordan; Đilović, Ivica; Galić, Nives; Tomišić, Vladislav; Cindrić, Marina
Vanadium-induced formation of thiadiazole and thiazoline compounds. Mononuclear and dinuclear oxovanadium(V) complexes with open-chain and cyclized thiosemicarbazone ligands // Dalton Transactions, 2009 (2009), 44; 9914-9923 doi:10.1039/b913653c (međunarodna recenzija, članak, znanstveni)


Naslov
Vanadium-induced formation of thiadiazole and thiazoline compounds. Mononuclear and dinuclear oxovanadium(V) complexes with open-chain and cyclized thiosemicarbazone ligands

Autori
Rubčić, Mirta ; Milić, Dalibor ; Horvat, Gordan ; Đilović, Ivica ; Galić, Nives ; Tomišić, Vladislav ; Cindrić, Marina

Izvornik
Dalton Transactions (1477-9226) 2009 (2009), 44; 9914-9923

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Vanadium(V) complexes; cyclization reactions; thiosemicarbazones; 1; 3; 4-thiadiazole derivatives; thiazoline derivatives; X-ray crystal structures; reaction kinetics

Sažetak
Reactions of the salicylaldehyde 4-phenylthiosemicarbazone (H2L) with selected vanadium(IV) and vanadium(V) precursors ([VO(acac)2], [VO(OAc)2], VOSO4, [V2O4(acac)2]) were investigated under aerobic conditions in different alcohols (methanol, ethanol, propanol). In all examined cases mononuclear alkoxo vanadium(V) complexes [VOL(OR)] ( 1) (OR = OMe, OEt, OPr) were isolated as major products. On prolonged standing, mother liquids afforded dinuclear vanadium(V) complexes [V2O3(Lcycl)2(OR)2] ( 3) (OR = OMe, OEt, OPr), where Lcycl- represents 1, 3, 4-thiadiazole ligand, formed by vanadium-induced oxidative cyclization of H2L. When [VO(acac)2] or [V2O4(acac)2] were used as precursors, in addition to products 1 and 3, a thiazoline derivative HL(acac)cycl ( 2) was isolated. This compound, formed by a reaction between acetylacetone and H2L, represented the second type of cyclic product. The products were characterized by IR and NMR spectroscopies, TG analysis, and in some cases by single-crystal X-ray diffraction. To the best of our knowledge, compounds [V2O3(Lcycl)2(OR)2] represent the first structurally characterized dinuclear vanadium(V) complexes with a thiadiazole moiety acting as a bridging ligand. Complexes 1 and 3, when dissolved in an appropriate alcohol, underwent substitution of the alkoxo ligand as confirmed by XRPD. The kinetics of reactions in methanolic solutions was qualitatively studied by UV-Vis and ESMS spectrometries. Under the experimental conditions applied, a relatively slow formation of the mononuclear complex [VOL(OMe)] and an even slower formation of the cyclic species 2 were observed, whereas the presence of dinuclear compound [V2O3(Lcycl)2(OMe)2] in the reaction mixture could not be detected.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
119-1191342-1082 - Novi kompleksni spojevi i materijali-kemijski i biološki katalizatori (Marina Cindrić, )
119-1191342-2960 - Elektroliti i koordinacijske reakcije u otopini (Vladislav Tomišić, )
119-1193079-1084 - Strukturno istraživanje bioloških makromolekula metodom rentgenske difrakcije (Dubravka Matković-Čalogović, )

Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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