Dielectric properties and phase transitions in (CH3NH3)3Sb2Br9

Jakubas, R.; Galewski, Zbigniew; Sobczyk, L.; Matuszewski, J.

doi:10.1088/0022-3719/18/27/003

Cited by 55 publications

(11 citation statements)

References 2 publications

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“…It is reported that two phase transitions take place at 131 and 168 K, respectively [10]. The temperature dependence of 8I Br NQR frequencies above 168 K was studied by Mackowiak et al [11].…”

Section: Tris-monomethylammonium Enneabromodiantimonate(iii) (Ch 3 Nmentioning

confidence: 99%

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NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)

Ishihara

Watanabe

Iwata

et al. 1992

Zeitschrift Für Naturforschung A

103

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2 D NMR spectra for partially deuterated (CH 3 ND 3 ) 3 Bi,Br 9 showed that the phase transitions in this compound are related to the motion of the methylammonium cations. Single-crystal X-ray work at room temperature shows that the space group for [N(CH 3 ) 4 ] 3 Sb 2 Cl 9 is_P6 3 /mmc with a = 925.1 pm, c = 2173.4 pm, Z = 2. For (CH 3 NH 3 ) 3 Sb 2 Br 9 the space group is P3ml with a = 818.8 pm, c = 992.7 pm, Z = 1; in both cases the cations show dynamical disorder. The Rietveld analysis of the powder X-ray diffraction for (CH 3 NH 3 ) 3 Bi 2 Br 9 reveals the space group P3ml with a = 821.0, c -1000.4 pm, Z = 1 at room temperature; the compound is isomorphous with (CH 3 NH 3 ) 3 Sb 2 Br 9 . The crystal symmetries of the low-temperature phases of (CH 3 NH 3 ) 3 Bi 2 Br 9 and [N(CH 3 ) 4 ] 3 Bi 2 Br 9 were deduced from the results of the NQR spectroscopy.

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Section: Tris-monomethylammonium Enneabromodiantimonate(iii) (Ch 3 Nmentioning

confidence: 99%

“…The possible space groups were P3ml, P321, and P3ml. We selected P3ml, as already proposed by Jakubas et al [10]. These authors selected P3ml because of the lack of the pyroelectric effect at room temperature.…”

Section: Tris-monomethylammonium Enneabromodiantimonate(iii) (Ch 3 Nmentioning

confidence: 99%

NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)

Ishihara

Watanabe

Iwata

et al. 1992

Zeitschrift Für Naturforschung A

103

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“…3). The terminal Sb-Cl distances for both octahedra are between 2.4036(11) and 2.4888(11) Å , whereas the bridging ones vary from 2.8416 (11) The secondary cause of deformation of the [SbCl 6 ] 3-octahedra in these compounds is weaker than the [38,39]. The formation of hydrogen bonds between the cations and all of the chlorine atoms except the non-bridging Cl3, Cl12 and Cl13 in DMACA results in the displacement of the chlorine atoms towards the organic cations [40], and especially the reduction of Sb-Cl-Sb bond angles (Table 3).…”

Section: Inorganic Anionic Frameworkmentioning

confidence: 99%

“…Among them is a group containing the two-dimensional [{M 2 X 9 } n ] 3n-layered polyanions. To this group of crystals belongs, among others, (CH 3 NH 3 ) 3 [Sb 2 Br 9 ] (MABA) and (CH 3 NH 3 ) 3 [Bi 2 Br 9 ] (MABB) [9,10] which transform at low temperatures to ferroelastic and then to ferroelectric phases [11][12][13]. The dimethylammonium crystal structures [(CH 3 ) 2 NH 2 ] 3 [Sb 2 Cl 9 ] (DMACA) and [(CH 3 ) 2 NH 2 ] 3 [Sb 2 Br 9 ] (DMA-BA) [14,15] undergo transitions at low temperatures to ferroelectric phases [16,17].…”

Section: Introductionmentioning

confidence: 99%

Single crystal X-ray diffraction studies on [(CH3)nNH4–n]3[Sb2Cl9] (, 3) chloroantimonates(III) in their low-temperature ferroelectric phases—structures and phase transitions

Bujak

Angel

2005

Journal of Solid State Chemistry

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“…[1][2][3] The 4-dimethylaminopyridinium cations are located in channels delimited by the anion chains (Fig. S1 (supporting information)).…”

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confidence: 99%

Synthesis and Crystal Structure of (4-Dimethylaminopyridinium)-tetrachoroantimoniate

Ghouili

Chaari

Zouari

2010

X-ray Structure Analysis Online

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Whereas several studies have been made in the solid state on complexes between antimony(III) and bromide or iodide, only few complexes of antimony(III) chlorides with organic cations have been investigated. In these compounds the metal shows a tendency towards distorted octahedral coordination with some rather long Sb-Cl bonds, which is attributed to the crystalpacking forces, e.g. hydrogen bonds rather than by lone electron-pair repulsion. These compounds are interesting because they exhibit phase transitions (ferro-paraelectric) related to motions of the ammonium cations. Here, we describe the crystal structure of (4-dimethylaminopyridinium) tetrachloroanti monate(III).The complex crystals were obtained by dissolving in a concentrated HCl solution a stoichiometric mixture of 4-dimethylaminopyridine and trichloride antimony(III); the resulting aqueous solution was then kept at room temperature. After several weeks of evaporation, pseudohexagonal prismshaped monocrystals of (4-dimethylaminopyridinium)tetrachloroantimonate(III) appeared in the solution. Chemical analyses of antimony atoms and chloride anions were carried out. 5 The experimental conditions used for single-crystal data collections are reported in Table 1. The positional parameters for the antimony atoms were obtained from a three-dimensional Patterson map, while the remaining atoms were found from a successive difference Fourier map. After introducing anisotropic thermal displacement parameters for the non-hydrogen atoms, the hydrogen atoms were localized and optimized to fixed positions. Their contributions were isotropically introduced into the calculation, but not refined. The final atomic coordinates are given in Table S1 (supporting information).The final anisotropic full-matrix least squares resulted in a convergence of the R factor to 0.0316, incorporating the weighting scheme w = 1/[s 2 (Fo 2 ) + (0.0746P) 2 ] + 0.8242P], where P = (Fo 2 + 2Fc 2 )/3.The molecular structure of the (4-dimethylaminopyridinium)-tetrachoroantimonate is shown in Fig. 1. The crystal structure consists of 4-dimethylaminopyridinium cations and polynuclear anions in which distorted SbCl6 octahedron sharing cis edges are interconnected into chains (Fig. 2). The [SbCl4] -anions share two cis edges with two other neighboring octahedra, and a skew infinite chain is formed parallel to the c axis at x = 0, y = 0 and x = 0.5, y = 0.5. Each Sb atom is surrounded by six Cl atoms, forming a distorted octahedral configuration with Cl-Sb-Cl X-ray Structure Analysis Online Synthesis and Crystal Structure of (4-Dimethylaminopyridinium)-tetrachoroantimoniateAfef GHOUILI, Najla CHAARI, † and Fatma ZOUARI Laboratoire des Sciences des Matériaux et d'Environnement, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, TunisiaThe salt tris(4-dimethylaminopyridinium)tetrachoroantimonate C7H11Cl4N2Sb crystallizes at room temperature in the monoclinic system with space group C2/c. The unit-cell dimensions are: a = 13.6692 (5)

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Dielectric properties and phase transitions in (CH₃NH₃)₃Sb₂Br₉

Cited by 55 publications

References 2 publications

NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)

NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)

Single crystal X-ray diffraction studies on [(CH3)nNH4–n]3[Sb2Cl9] (, 3) chloroantimonates(III) in their low-temperature ferroelectric phases—structures and phase transitions

Synthesis and Crystal Structure of (4-Dimethylaminopyridinium)-tetrachoroantimoniate

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Dielectric properties and phase transitions in (CH3NH3)3Sb2Br9

Cited by 55 publications

References 2 publications

NQR and X-ray Studies of [N(CH3)4]3M2X9 and (CH3NH3)3M2X9 (M = Sb,Bi; X = Cl,Br)

NQR and X-ray Studies of [N(CH3)4]3M2X9 and (CH3NH3)3M2X9 (M = Sb,Bi; X = Cl,Br)

Single crystal X-ray diffraction studies on [(CH3)nNH4–n]3[Sb2Cl9] (, 3) chloroantimonates(III) in their low-temperature ferroelectric phases—structures and phase transitions

Synthesis and Crystal Structure of (4-Dimethylaminopyridinium)-tetrachoroantimoniate

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Dielectric properties and phase transitions in (CH₃NH₃)₃Sb₂Br₉

NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)

NQR and X-ray Studies of [N(CH₃)₄]₃M₂X₉ and (CH₃NH₃)₃M₂X₉ (M = Sb,Bi; X = Cl,Br)