Rhenium part XV. Tetragonal complexes of nickel(II) containing coordinated perrhenate [ReO4]?

Chakravorti, M. C.; Sarkar, Mukti B.; Bharadwaj, Parimal K.

doi:10.1007/bf00618225

Cited by 7 publications

(31 citation statements)

References 22 publications

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“…The MIR spectra registered for both compounds are very similar to each other. Moreover, they are typical for members of the ammine complexes group [10][11][12] 2 in the 4,000-250 cm -1 wavenumber region were presented in paper [3]. Infrared spectrum (MIR and FIR) registered by us in the 4,000-30 cm -1 wavenumber region is in good agreement with data presented by Chakravorti et al [3].…”

Section: Resultssupporting

confidence: 87%

“…ion is tetragonal. On the other hand, the magnetic measurements indicate that Ni 2? complex is six-coordinate [3]. We have found none TG data for [Ni(NH 3 ) 6 ](ReO 4 ) 2 .…”

Section: Introductionmentioning

confidence: 73%

“…The simultaneous evolved gas analysis (EGA) was performed during the experiments by a joined on-line quadruple mass spectrometer (TG-MS) using a ThermostarBalzers apparatus. The temperature was measured by a Pt-Pt/Rh thermocouple with an accuracy of ±0.5 K. In order to estimate the energy activation for identified decomposition steps further TG runs (with the same conditions but without MS signals) for [Ni(NH 3 2 were placed in 40 ll aluminum partially open crucibles (micro hole preserves constant pressure over the sample). Measurements were performed under constant flow of Argon (80 cm 3 min -1 ) with the heating/cooling rate being equal to 10 K min -1 .…”

Section: Methodsmentioning

confidence: 99%

“…, NH 3 ligands, and tetrahedral ReO 4 -anions. The various hexaamminenickel(II) complexes with different anions as a counter ion were intensively examined up to now.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the literature concerning basic properties of the title compounds is rather limited. The decomposition of [Ni(NH 3 ) 4 ](ReO 4 ) 2 was investigated by Chakravorti et al [3] by the TG method but only up to 573 K. The authors have found that complete deammination of this compounds proceeds in two stages. According to these authors, the electronic spectra indicate that [Ni(NH 3 ) 4 ] 2?…”

Section: Introductionmentioning

confidence: 99%

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Comparison of vibrational dynamics, thermal behaviour, and phase transition in [Ni(NH3)4](ReO4)2 and [Ni(NH3)6](ReO4)2

Hetmańczyk

2014

J Therm Anal Calorim

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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 2 O 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.

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Section: Resultssupporting

confidence: 87%

“…ion is tetragonal. On the other hand, the magnetic measurements indicate that Ni 2? complex is six-coordinate [3]. We have found none TG data for [Ni(NH 3 ) 6 ](ReO 4 ) 2 .…”

Section: Introductionmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

“…, NH 3 ligands, and tetrahedral ReO 4 -anions. The various hexaamminenickel(II) complexes with different anions as a counter ion were intensively examined up to now.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations