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Comparison of vibrational dynamics, thermal behaviour, and phase transition in $[Ni(NH_3)_4](ReO_4)_2$ and $[Ni(NH_3)_6](ReO_4)_2$

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Comparison of vibrational dynamics, thermal behaviour, and phase transition in $[Ni(NH_3)_4](ReO_4)_2$ and $[Ni(NH_3)_6](ReO_4)_2$

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dc.contributor.author Hetmańczyk, Łukasz [SAP11018142] pl
dc.contributor.author Hetmańczyk, Joanna [SAP11019446] pl
dc.date.accessioned 2015-07-07T09:15:35Z
dc.date.available 2015-07-07T09:15:35Z
dc.date.issued 2015 pl
dc.identifier.issn 1388-6150 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/11901
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa *
dc.rights.uri http://creativecommons.org/licenses/by/4.0/pl/legalcode *
dc.title Comparison of vibrational dynamics, thermal behaviour, and phase transition in $[Ni(NH_3)_4](ReO_4)_2$ and $[Ni(NH_3)_6](ReO_4)_2$ pl
dc.type JournalArticle pl
dc.description.physical 1415-1428 pl
dc.identifier.weblink https://link.springer.com/content/pdf/10.1007%2Fs10973-014-4292-3.pdf pl
dc.abstract.en The differences between thermal and vibrational properties of $[Ni(NH_3)_4](ReO_4)_2$ and $[Ni(NH_3)_6](ReO_4)_2$ are reported. The differential scanning calorimetry revealed that tetraamminenickel(II) perrhenate exhibits, in the temperature range of 300–140 K, one phase transition at ca. T c h = 188 K (on heating) and T c c = 185 K (on cooling). In the case of hexaamminenickel(II) perrhenate, no phase transition was observed in the same temperature region. Thermogravimetric measurements showed that the decomposition proceeds in the two main stages. In the first stage, a complete deammination takes place and next $Re_2O_7$ is released. TG measurements showed that $NH_3$ molecules are not equivalently bonded to central atom. The final and intermediate products of decomposition were analysed by means of infrared spectroscopy. The final product of thermal decomposition of both compounds is nickel(II) oxide. The analysis of far infrared spectra revealed that anions in $[Ni(NH_3)_6](ReO_4)_2$ have disturbed tetrahedral symmetry, whereas in $[Ni(NH_3)_4](ReO_4)_2$ they seem to form polymeric chains. The variation of the activation energies of the deammination and decomposition steps of $[Ni(NH_3)_6](ReO_4)_2$ was calculated through the model-free isoconversional Kissinger–Akahira–Sunose method and model-free Kissinger method. Infrared spectra were calculated by the DFT method and quite a good agreement with the experimental data was obtained. pl
dc.description.volume 119 pl
dc.description.number 2 pl
dc.identifier.doi 10.1007/s10973-014-4292-3 pl
dc.identifier.eissn 1588-2926 pl
dc.title.journal Journal of Thermal Analysis and Calorimetry pl
dc.language.container eng pl
dc.date.accession 2018-07-12 pl
dc.affiliation Wydział Chemii : Zakład Fizyki Chemicznej pl
dc.affiliation Wydział Chemii : Zakład Dydaktyki Chemii pl
dc.subtype Article pl
dc.rights.original CC-BY; inne; ostateczna wersja wydawcy; w momencie opublikowania; 0 pl
dc.identifier.project ROD UJ / P pl
.pointsMNiSW [2015 A]: 20


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Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa