Author(s):
1. Nemanja Stojanović, Fakultet tehničkih nauka u Čačku Univerziteta u Kragujevcu, Serbia
2. Aleksandra Janićijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Serbia
3. Aco Janicijević, Tehnološko-metalurški fakultet, Univerzitet u Beogradu, Srbija, Serbia

Abstract:
Thermally prompted dehydration of binuclear [Ni2(en)2(H2O)6(pyr)]•4H2O complex occurs within a 326 K to 410 K temperature region, presenting an asymmetrical DSC peak. The process is endothermal and results in loss of 10 molecules of water accounting for 27% of a total mass of the sample. Values of the apparent activation energy of 71 kJ/mol and 93 kJ/mol were determined by using Kissinger's and the isoconversional KAS approach, respectively. Probable reaction mechanism was determined by Dollimore's analysis. As the heating rate increases diffusion becomes a significant step in the mechanism of dehydration. Deconvolution of the experimental DSC peak on different heating rates shows that the mechanism of dehydration changes with the change of the heating regime. Using the linear compensation effect, values of invariant activation energy of 61 kJ/mol as well as of Arrhenius pre-exponential factor of 6•107 min-1 were determined.

Key words:
coordination polymer, Ni(II) complex, dehydration, thermal analysis, compensation effect, kinetic parameterization.

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
23.05.2021.

Conference:
Contemporary Materials 2021 - Savremeni materijali