Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt
Apstrakt
In this work a series of spectrophotometric measurements of cobalt(II) chloride in calcium nitrate tetrahydrate melts containing variable amounts of calcium chloride (from 0 to 3.1 mol dm(-3)) were performed at different temperatures from 40 to 70 degreesC. The solutions in pure calcium nitrate tetrahydrate showed octahedral co-ordination, the position of the absorption maximum being at 19420 cm(-1) (512 nm). Addition of chloride caused a shift of the absorption maximum toward lower energies and a large increase of the absorption coefficient indicating a change from octahedral to tetrahedral or distorted octahedral co-ordination, characteristic for cobalt(II) chloride complexes in aqueous nitrate melts. The position of the absorption maximum of the octahedral and tetrahedral complexes and the values of the molar absorption coefficients indicates some co-ordination also by nitrate ion. Stability constants for [CO(NO3)(4)](2-), [CO(NO3)(2)Cl-2](2-) and [COCl4](2-) and the corresponding r...esolved species spectra are reported.
Ključne reči:
cobalt(II) chloride complexes / calcium nitrate tetrahydrate / absorption spectra / stability constantsIzvor:
High Temperature Material Processes, 2001, 5, 4, 573-581Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Zsigrai, Istvan J. AU - Gadžurić, Slobodan AU - Nikolic, R PY - 2001 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2504 AB - In this work a series of spectrophotometric measurements of cobalt(II) chloride in calcium nitrate tetrahydrate melts containing variable amounts of calcium chloride (from 0 to 3.1 mol dm(-3)) were performed at different temperatures from 40 to 70 degreesC. The solutions in pure calcium nitrate tetrahydrate showed octahedral co-ordination, the position of the absorption maximum being at 19420 cm(-1) (512 nm). Addition of chloride caused a shift of the absorption maximum toward lower energies and a large increase of the absorption coefficient indicating a change from octahedral to tetrahedral or distorted octahedral co-ordination, characteristic for cobalt(II) chloride complexes in aqueous nitrate melts. The position of the absorption maximum of the octahedral and tetrahedral complexes and the values of the molar absorption coefficients indicates some co-ordination also by nitrate ion. Stability constants for [CO(NO3)(4)](2-), [CO(NO3)(2)Cl-2](2-) and [COCl4](2-) and the corresponding resolved species spectra are reported. T2 - High Temperature Material Processes T1 - Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt VL - 5 IS - 4 SP - 573 EP - 581 UR - https://hdl.handle.net/21.15107/rcub_vinar_2504 ER -
@article{ author = "Zsigrai, Istvan J. and Gadžurić, Slobodan and Nikolic, R", year = "2001", abstract = "In this work a series of spectrophotometric measurements of cobalt(II) chloride in calcium nitrate tetrahydrate melts containing variable amounts of calcium chloride (from 0 to 3.1 mol dm(-3)) were performed at different temperatures from 40 to 70 degreesC. The solutions in pure calcium nitrate tetrahydrate showed octahedral co-ordination, the position of the absorption maximum being at 19420 cm(-1) (512 nm). Addition of chloride caused a shift of the absorption maximum toward lower energies and a large increase of the absorption coefficient indicating a change from octahedral to tetrahedral or distorted octahedral co-ordination, characteristic for cobalt(II) chloride complexes in aqueous nitrate melts. The position of the absorption maximum of the octahedral and tetrahedral complexes and the values of the molar absorption coefficients indicates some co-ordination also by nitrate ion. Stability constants for [CO(NO3)(4)](2-), [CO(NO3)(2)Cl-2](2-) and [COCl4](2-) and the corresponding resolved species spectra are reported.", journal = "High Temperature Material Processes", title = "Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt", volume = "5", number = "4", pages = "573-581", url = "https://hdl.handle.net/21.15107/rcub_vinar_2504" }
Zsigrai, I. J., Gadžurić, S.,& Nikolic, R.. (2001). Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt. in High Temperature Material Processes, 5(4), 573-581. https://hdl.handle.net/21.15107/rcub_vinar_2504
Zsigrai IJ, Gadžurić S, Nikolic R. Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt. in High Temperature Material Processes. 2001;5(4):573-581. https://hdl.handle.net/21.15107/rcub_vinar_2504 .
Zsigrai, Istvan J., Gadžurić, Slobodan, Nikolic, R, "Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt" in High Temperature Material Processes, 5, no. 4 (2001):573-581, https://hdl.handle.net/21.15107/rcub_vinar_2504 .