Unprecedented solid-state chemical reaction—from . From centrosymmetric to non-centrosymmetric crystal structure

Piecha, A.; Gągor, Anna; Pietraszko, A.; Jakubas, R.

doi:10.1016/j.jssc.2010.10.020

Cited by 35 publications

(21 citation statements)

References 23 publications

(29 reference statements)

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“…However, those of the second phase transition are 4.101 k J mol -1 and 10.41 J mol -1 K -1 , respectively. These experimentally observed entropies can be interpreted in terms of Boltzmann's principle DS = R Ln X = R Ln N1\N2 where N1 and N2 are the number of distinguishable orientations allowed in the high-and low-temperature phases [13]. At 340 and 393 K, the Nl/N2 ratio is equal to 4 and 3.5, respectively.…”

Section: Geometry Of the Znbr 4 2-anionmentioning

confidence: 97%

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

2016

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The new organic-inorganic compound tetrapropylammonium tetrabromozincate [N(C 3 H 7 ) 4 ] 2 ZnBr 4 has been synthesized and characterized by single-crystal X-ray diffraction, differential scanning calorimetry, IR, Raman and impedance measurements. The crystal structure refinement shows that the [N(C 3 H 7 ) 4 ] 2 ZnBr 4 compound is crystallized in the monoclinic system (space group C 2/c ) with the following unit cell parameters: a = 33.145(5) Å , b = 14.234(3) Å , c = 15.081(2) Å , b = 110.207(5)°and Z = 8. The structural arrangement of the title compound can be described as an alternation of organic and inorganic layers along the [100] direction. Differential scanning calorimetry disclosed two order-disorder transition phases located at 340 and 393 K. Besides, an analysis of the dielectric constants e 0 and e 00 , at several frequencies, shows a distribution of relaxation times. This relaxation is probably due to the reorientational dynamics of alkyl chains.

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Section: Geometry Of the Znbr 4 2-anionmentioning

confidence: 97%

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

2016

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“…where N1 and N2 are the numbers of distinguishable orientations allowed in high-temperature and the low-temperature phases [30]. Table 3 Principal inter-atomic distances (Å) and angles (1) of organic groups [(C 4 H 9 ) 4 N] þ .…”

Section: Thermal Analysismentioning

confidence: 99%

Synthesis, crystal structure, thermal analysis and dielectric properties of [(C4H9)4N]3Bi2Cl9 compound

Trigui

Oueslati

Chaabane

et al. 2015

Journal of Solid State Chemistry

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“…9 Since the entropy value is larger than R Ln2, the transition can be classified as an order-disorder one. The observed value of ∆S leads to Nl/N2 = 5(Ω).…”

Section: A Calorimetric Measurementsmentioning

confidence: 99%

Raman scattering study of temperature induced phase transition in [C8H10NO]2 [ZnCl4]

et al. 2015

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The Raman spectra of bis (4-acetylanilinium) tetrachloridozincate single crystals were studied in the range of 100-3500 cm −1 as a function of temperature of 298 K to 398 K. The bands mainly associated with the internal modes of the ZnCl 4 anions only undergo weak changes. However, the strong evolutions of wavenumbers, widths and intensities of many lines associated with the organic cations are observed with discontinuities in the vicinity of the phase transition at 351 K. A phase transition at Tc = 351K was observed and characterized by the differential scanning calorimetry (DSC). The most important changes are observed for two lines at 3197.13 cm −1 and 3167.10 cm −1 (at room temperature) issued from asymmetric and symmetric stretching vibrations of (C-H) band and (NH 3 ) group, respectively. The spectral characteristics of these lines are analyzed and consistently described in the framework of an order-disorder model for the phase transition. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Unprecedented solid-state chemical reaction—from . From centrosymmetric to non-centrosymmetric crystal structure

Cited by 35 publications

References 23 publications

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

Synthesis, crystal structure, thermal analysis and dielectric properties of [(C4H9)4N]3Bi2Cl9 compound

Raman scattering study of temperature induced phase transition in [C8H10NO]2 [ZnCl4]

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