Phase sequence in diisopropylammonium iodide: avoided ferroelectricity by the appearance of a reconstructed phase

Piecha-Bisiorek, Anna; Gągor, Anna; Isakov, Dmitry; Zieliński, Piotr; Gałązka, Mirosław; Jakubas, R.

doi:10.1039/c6qi00583g

Cited by 22 publications

(8 citation statements)

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“…Two CH 3 groups (C3 and C4 atoms), bonded to C2 atom, are placed in the general positions. Dynamical properties of the aliphatic ammonium cations, e.g ., diisobutylammonium cation, are usually highly dynamically disordered. ,, The single-crystal of diisobutylammonium bromide is also described in the room-temperature phase by the tetragonal I 4/ mmm space group with similar unit cell (CDCC 1059278), however, the crystal structure is not isomorphous with the 1 analog. The structure comparison with 1 indicates that the N atom is located in the vicinity of another special position 4/ mmm (Wyckoff position 2 b ).…”

Section: Resultsmentioning

confidence: 99%

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]

et al. 2020

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Molecular−ionic crystals, which are built of organic cations and discrete anionic components with AMX 4 stoichiometry, easily induce structural order−disorder transitions. These phenomena can generate interesting ferroic properties. Herein, we have synthesized and characterized a novel AMX 4 -type crystal, (C 8 H 20 N)-[BF 4 ] (1). Thermal analysis, (DSC, TGA) indicates one structural phase transition (PT) at 257/259 K (cooling/heating, I ↔ II). The structure of 1 has been solved at two temperatures, 120 and 298 K, with single-crystal X-ray diffraction. The high-temperature phase I (1-HT) shows a tetragonal structure with the space group I4/mmm, whereas the low-temperature phase II (1-LT) is monoclinic with the space group P2 1 /a. The PT belongs, thus, to the improper ferroelastic species 4/mmmF2/m with a 4-fold multiplication of the unit cell. All four possible ferroelastic domains of phase II have been identified in polarized light microscopy. The monoclinic deformation has been shown to give rise to a characteristic parquet-like texture preserving integrity of 1. The molecular mechanism of PT involving changes in the cationic and anionic dynamics has been postulated based on measurements of the 1 H and 19 F NMR spin−lattice relaxation times, T 1 , and second-moment, M 2 , and of the dielectric responses. The ac and dc conductivity measurements have been used to determine the transport properties of the charge carriers in 1. The intrinsic features of molecular−ionic crystals, such as the dynamics of molecular motions, structural instability with a lattice-symmetry change, formation of domain patterns, etc., provide a crystal with unique ferroelastic properties. This type of crystal may be useful as an functional material.

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Section: Resultsmentioning

confidence: 99%

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]

et al. 2020

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“…При комнатной температуре DIPAI принадлежит к орторомбической неполярной хиральной пространственной группе P2 1 2 1 2 1 [9,10]. Однако при нагревании в зависимости от растворителя, в котором происходила перекристаллизация DIPAI, возможны два сценария.…”

Section: образцы и методика экспериментаunclassified

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

Милинский¹,

Барышников²,

Чарная³

et al. 2020

Физика Твердого Тела

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The results of studying the linear and nonlinear dielectric properties of a new organic ferroelectric diisopropylammonium iodide (DIPAI), embedded in porous alumina films, in comparison with bulk DIPAI, are presented. It was found, for DIPAI in pores 300 and 60 nm in diameter the ferroelectric phase is formed in the heating and cooling modes in the temperature interval between two structural phase transitions above room temperature. No noticeable temperature hysteresis was observed for both phase transitions. It was shown that the boundaries of the intermediate polar phase for nanostructured DIPAI shift to low temperatures with decreasing pore size. For bulk DIPAI, two structural transitions were revealed during heating with the formation of an intermediate polar phase and only one transition during cooling, below which ferroelectricity occurred. The temperature of this transition was much lower than the corresponding temperature during heating. It is assumed that the observed differences in phase transitions for DIPAI in pores and bulk DIPAI are associated with acceleration of the phase transitions kinetics under conditions of nanoconfinement.

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“…Its asymmetric unit is comprised of one diisopropylammonium cation and one hydrogen maleate (Figure 1). Several crystals of salts containing the diisopropylammonium cation, iPrNH 2 + are isolated and their structures reported in the literature [14,15,16,17,18].…”

Section: Crystallographic Studymentioning

confidence: 99%

Crystal Structure of Diisopropylammonium Hydrogen Maleate

Seye¹,

Toure²,

Lo³

et al. 2019

SJC

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Use of salts and co-crystals of active pharmaceutical ingredients (APIs) as a method for tuning their delivery and activity is an area of growing interest. Modifying API properties such as solubility by finding new salts that employ similar hydrogen-bonding have been successful. In an effort to further study the hydrogen-bonding patterns of the maleate ion with other diisopropylammonium we report here the synthesis and diisopropylammonium maleate. The salt was isolated from reaction between diisopropylamine and maleic acid in methanol. The results of elementary analyzes (CHN) showed the presence of the nitrogen atom of diisopropylamine, carbon atoms and hydrogen. The IR spectrum of diisopropylammonium hydrogen maleate, showed the presence of two intense bands due to the vibrations of symmetricand anti-symmetric valence of the carboxylate group and a wide absorption due to the NH 2 groups of the cation. Those which has been confirmed by crystallography. The asymmetric unit contains one diisopropylammonium cation, iPr 2 NH 2 + and one hydrogen maleate anion. In the structure, anions which present an inner O-H…O hydrogen bond are linked to cations through N-H…O hydrogen bonds leading to infinite chains. Chains are connected to their neighbours through weak C-H…O hydrogen bonds affording a layer. The study of the interactions of diisopropylammonium hydrogen menaleate, by the presence of hydrogen bonds leading to supramolecular architectures has shown the possibility of its use in Active Pharmaceutical Ingrédients (API).

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Phase sequence in diisopropylammonium iodide: avoided ferroelectricity by the appearance of a reconstructed phase

Abstract: Crystals of diisopropylammonium iodide are synthesized, grown and characterized.

Cited by 22 publications

References 29 publications

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

Crystal Structure of Diisopropylammonium Hydrogen Maleate

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Phase sequence in diisopropylammonium iodide: avoided ferroelectricity by the appearance of a reconstructed phase

Abstract: Crystals of diisopropylammonium iodide are synthesized, grown and characterized.

Cited by 22 publications

References 29 publications

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C8H20N)[BF4]

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C8H20N)[BF4]

Влияние Наноконфайнмента На Кинетику Фазовых Переходов В Органическом Сегнетоэлектрике DIPAI

Crystal Structure of Diisopropylammonium Hydrogen Maleate

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Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]

Temperature-Stimulus Responsive Ferroelastic Molecular–Ionic Crystal: (C₈H₂₀N)[BF₄]