1st International Conference on Chemo and BioInformatics, ICCBIKG 2021, (454-457)
AUTHOR(S) / АУТОР(И): Milan Vraneš, Jovana Panić, Snežana Papović, Teodora Teona Borović, Aleksandar Tot, Nikolet Baganj, Slobodan Gadžurić
E-ADRESS / Е-АДРЕСА: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
ABSTRACT / САЖЕТАК:
In this work, the absorption spectra of cobalt(II) nitrate and bromide complexes in the composition 0.3Ca(NO3)2 – 0.7NH4NO3 – H2O have been investigated in the 400-800 nm range of wavelength at T = 328.15 K and atmospheric pressure P = 101.3 kPa. Spectra were recorded in solutions with variable water content (R = H2O/salt mole ratio; R = 1.0, 1.2 and 1.6). The blue shift of the absorption maximum with the water content increase (R) suggest simultaneous coordination by water molecules and nitrate ions. From an analysis of the spectra, it can be concluded that the following: [Co(NO3)4(H2O)2]2−, [Co(NO3)2Br2]2− and [CoBr4]2− complexes were formed. The overall stability constants of these complexes species spectra were calculated at T = 328.15 K.
KEY WORDS / КЉУЧНЕ РЕЧИ:
cobalt(II) complexes, water influence, spectrophotometry, calcium nitrate, ammonium nitrate, stability constants
REFERENCES / ЛИТЕРАТУРА:
- M. Vraneš, S. Gadžurić, I.J. Zsigrai., Cobalt halide complex formation in aqueous calcium nitrate–ammonium nitrate melts. II. Cobalt(II) bromide, Journal of Molecular Liquids, 145 (2011) 14-18.
- S. Gadžurić, B. Matijević, I.J. Zsigrai, M. Vraneš., Thermochromic behaviour and cobalt(II) bromide complex equilibrium in low temperature melting acetamide–ammonium nitrate– water mixtures, Journal of Molecular Liquids, 159 (2011) 157-160.
- B. Matijević, I.J. Zsigrai, M. Vraneš, S. Gadžurić., Cobalt(II)-halide association in ammnium nitrate–dimethyl sulfoxide melts, II. Cobalt(II) bromide, Journal of Molecular Liquids, 169 (2012) 117-123.
- S. Gadžurić, M. Vraneš, S. Dožić, Thermochromic cobalt(II) chloro-complexes in different media: Possible application for auto-regulated solar protection, Solar Energy Material Solar Cells, 105 (2012) 309-316.