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Pregled bibliografske jedinice broj: 348380

Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution

Kukovec, Boris-Marko; Popović, Zora; Komorsky-Lovrić, Šebojka; Vojković, Vlasta; Vinković, Marijana
Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution // Inorganica chimica acta, 362 (2009), 8; 2704-2714 doi:10.1016/j.ica.2008.12.006 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 348380 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution

Autori
Kukovec, Boris-Marko ; Popović, Zora ; Komorsky-Lovrić, Šebojka ; Vojković, Vlasta ; Vinković, Marijana

Izvornik
Inorganica chimica acta (0020-1693) 362 (2009), 8; 2704-2714

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

Ključne riječi
cobalt ; 3- and 6-methylpicolinic acid ; crystal structures ; UV/Vis spectroscopy ; voltammetry

Sažetak
Cobalt complexes of 3- and 6-methylpicolinic acid, namely [Co(3-Mepic)3] (1) and [Co(6-Mepic)2(H2O)2] . 2H2O (2) were prepared and characterized by spectroscopic methods (IR, UV/Vis, NMR), their molecular and crystal structures were determined by X-ray crystal structure analysis and their thermal stability by TGA/DTA methods. 1 and 2 were prepared in similar reaction conditions (mildly alkaline aqueous solution). Unexpected oxidation of cobalt(II) by air occurred in the case of 3-methylpicolinic acid, leading to the formation of 1. Square-wave voltammetry showed that on mercury electrode the oxidation of 2 requires higher potential than the oxidation of complex anion [Co(3-Mepic)3]− , which is the most probable product of the reduction of 1. Voltammetric measurements can not explain the difference in oxidation states of cobalt ions in 1 and 2, since the reduction of 1 and the oxidation of 2 depend on the kinetics of electron transfer and the electrode material. X-Ray structural analysis revealed octahedral coordination polyhedron in both 1 and 2 and the and the same N, O-chelated coordination mode for both 3- and 6-methylpicolinic acid. 13C, 1H and 15N NMR spectroscopy confirmed that coordination mode of 3-methylpicolinic acid in 1 in DMSO solution. UV/Vis spectrophotometric measurements were used to study the complexation of cobalt by 3- and 6-methylpicolinic acid in aqueous solution and to determine the composition of the formed complexes by Job method of continuous variation. The stoichiometry of the complex with 3-methylpicolinic acid is 1:2, while it is 1:1.5 for the complex with 6-methylpicolinic acid, indicating the possible polymeric species.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA

Projekti:
098-0982929-2917 - Spektroskopija NMR i modeliranje bioaktivnih molekula (Plavšić, Dejan, MZOS ) ( CroRIS)
098-0982904-2907 - Elektroanalitička istraživanja mikrokristala i tragova otopljenih supstanci (Lovrić, Milivoj, MZOS ) ( CroRIS)
119-1193079-1332 - Kemija metalnih kompleksa u reakcijama od biološkog značaja i novim materijalima (Popović, Zora, MZOS ) ( CroRIS)
119-1191342-2959 - Spektroskopska analiza nezasićenih sustava i spojeva metala (Miljanić, Snežana, MZOS ) ( CroRIS)

Ustanove:
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Marijana Vinković (autor)

Avatar Url Boris-Marko Kukovec (autor)

Avatar Url Vlasta Vojković (autor)

Avatar Url Zora Popović (autor)

Poveznice na cjeloviti tekst rada:

doi www.sciencedirect.com doi.org

Citiraj ovu publikaciju:

Kukovec, Boris-Marko; Popović, Zora; Komorsky-Lovrić, Šebojka; Vojković, Vlasta; Vinković, Marijana
Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution // Inorganica chimica acta, 362 (2009), 8; 2704-2714 doi:10.1016/j.ica.2008.12.006 (međunarodna recenzija, članak, znanstveni)
Kukovec, B., Popović, Z., Komorsky-Lovrić, Š., Vojković, V. & Vinković, M. (2009) Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution. Inorganica chimica acta, 362 (8), 2704-2714 doi:10.1016/j.ica.2008.12.006.
@article{article, author = {Kukovec, Boris-Marko and Popovi\'{c}, Zora and Komorsky-Lovri\'{c}, \v{S}ebojka and Vojkovi\'{c}, Vlasta and Vinkovi\'{c}, Marijana}, year = {2009}, pages = {2704-2714}, DOI = {10.1016/j.ica.2008.12.006}, keywords = {cobalt, 3- and 6-methylpicolinic acid, crystal structures, UV/Vis spectroscopy, voltammetry}, journal = {Inorganica chimica acta}, doi = {10.1016/j.ica.2008.12.006}, volume = {362}, number = {8}, issn = {0020-1693}, title = {Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution}, keyword = {cobalt, 3- and 6-methylpicolinic acid, crystal structures, UV/Vis spectroscopy, voltammetry} }
@article{article, author = {Kukovec, Boris-Marko and Popovi\'{c}, Zora and Komorsky-Lovri\'{c}, \v{S}ebojka and Vojkovi\'{c}, Vlasta and Vinkovi\'{c}, Marijana}, year = {2009}, pages = {2704-2714}, DOI = {10.1016/j.ica.2008.12.006}, keywords = {cobalt, 3- and 6-methylpicolinic acid, crystal structures, UV/Vis spectroscopy, voltammetry}, journal = {Inorganica chimica acta}, doi = {10.1016/j.ica.2008.12.006}, volume = {362}, number = {8}, issn = {0020-1693}, title = {Synthesis, structural, spectroscopic and thermal characterization of cobalt complexes with 3- and 6-methylpicolinic acid. Voltammetric and spectrophotometric study in solution}, keyword = {cobalt, 3- and 6-methylpicolinic acid, crystal structures, UV/Vis spectroscopy, voltammetry} }

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

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