Naslov
Cobalt complexes with biologically active dithiocarbamate derivative

Autori
Kosović, Milica ; Višnjevac, Aleksandar ; Vojta, Danijela ; Đaković, Marijana ; Leka, Zorica

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

Izvornik
The 22 Croatian-Slovenian Crystallographic Meeting, BOA / Popović, Stanko ; Štefanić, Zoran - Zagreb : Hrvatska kristalografska zajednica HAZU, 2013, 13-13

Skup
22. Croatian-Slovenian Crystallographic Meeting

Mjesto i datum
Biograd na Moru, Hrvatska, 12.06.2013. - 16.06.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
dithiocarbamates; cobalt complexes; X-ray; antifungal activity

Sažetak
Dithiocarbamates are regularly used as fungicides in agriculture. Complexes of Co(II) and Co(III) with previously reported, biologically active ligand, N, N-diacetato-N-dithiocarbamate (idadtc3) (1) were prepared and characterized. Anionic Co(II) complex [Co2(H2idadtc)5](2) reveals a binuclear structure where two hexacoordinated cobalt(II) centres (CoA and CoB) are presumably double-bridged by two sulfurs from two ligand molecules. Remaining two sulfurs of these ligand molecules both coordinate the CoB centre. Its octahedral coordination sphere is completed by two sulfurs from the CSS group of the third ligand molecule. CoA is also bound to four sulfurs from remaining two ligand molecules. Formation of the anionic species (2) was undoubtly proven by MALDI- TOFF analysis. Magnetic measurements revealed a strong antiferromagnetic coupling of two neighbouring paramagnetic Co(II) centres, suggesting the double bridged arrangement as described here and by others. The elemental analysis is in a very good agreement with NH4+ as a counterion, giving a reliable proof that the cobalt ions are not oxidized to the Co(III) state. The structure of the Co(III) complex (3) reveals a neutral mononuclear complex molecule with a hexacoordinated cobalt(III) centre of a molecular formula [Co(dadtc)3]. Complex 2 undergoes, over several days, a spontaneous oxidation of Co(II) to Co(III) in aqueous solution, followed by a general molecular rearrangement, resulting in indirect formation of the complex 3, as proven by the X-ray structure analysis.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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