Effect on Local Structure and Phase Transition of Perovskite-Type [N(CH3)4]2Zn1-xCuxBr4 (x = 0, 0.5, 0.7, and 1) Crystals with the Various Doping of Cu2+ Ions

Lim, Ae Ran

doi:10.1038/s41598-018-32022-z

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…Further, 13 C nuclear magnetic resonance (NMR) has proven to be a powerful technique for studying the local dynamic motions of molecules [29]. The 13 C spin-lattice relaxation time ( T 1ρ ) in the rotating frame is an important experimental variable for probing the dynamic processes of a molecule [30]. By studying the relaxation of the nuclei in different environments of the chain, it is possible to obtain a detailed picture of the motion of different parts of the chain in a polymer.…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

2019

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Two series of thermotropic liquid-crystalline polymers (TLCPs) were synthesized by reacting various dialkoxy terephthalate units with hydroquinone (HQ) and 2,6-naphthalene diol (Naph). The dialkoxy terephthalate moieties used in this study include 2,5-diethoxyterephthalate, 2,5-dibutoxyterephthalate, and 2,5-dihexyloxy-terephthalate. All the TLCPs synthesized in this study formed nematic phases. The molecular motions according to the length of the dialkoxy side groups in the TLCPs were evaluated by 13C cross-polarization/magic angle spinning nuclear magnetic resonance spectroscopy. The thermal properties and molecular dynamics of the TLCPs are found to be affected by the length of the dialkoxy side group and the aromatic diol unit in the main chain. Further, the thermal behaviors, liquid crystalline mesophases, and degree of crystallinity of the two series of TLCPs, i.e., HQ- and Naph-TLCPs, are compared.

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Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

2019

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Structural Elucidation of Electrical and Optical Properties in Lead‐free Organic‐Inorganic Copper Bromide [(CH₃)₄N]₂CuBr₄ Single Crystals

Dinesh,

Singh

2024

ChemistrySelect

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Organic‐inorganic metal halide single crystals have attracted a lot of attention due to their flexible structural design and excellent optoelectronic applications. This study details the synthesis of copper‐based [(CH3)4N]2CuBr4 hybrid metal halide single crystals via a slow evaporation method. The crystal structure, crystal habit, chemical groups, intermolecular interactions, electrical properties of the sample were studied via single crystal x‐ray diffraction, scanning electron microscopy, Raman and Fourier transform infrared spectrometer, Hirshfeld surface analysis, impedance spectroscopy, and modulus spectroscopy, respectively. An orthorhombic crystal system with the non‐centrosymmetric space group Pna21 was identified at room temperature. The deformation in the tetrahedra was calculated by the bond angle and bond length deformation index. The Cole‐Cole plot displayed the existence of depressed semicircles, which indicated the predominant distribution of grains, further confirmed by the SEM image. The deformed semi‐circular arcs on the electric modulus curve undeniably prove that the bulk effect dominates the material‘s electrical properties. Significantly, the compound presents a phase transition at ~240 K and excellent thermal stability up to a temperature of 400 K. Therefore, our research sheds light on the temperature dependence of electrical responses in these hybrid crystals and gives inspiration for the development of single crystal‐based efficient energy devices.

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Discrete Hexa- and Binuclear Heterometallic Iodobismuthate(III) Complexes with Cu(I) and Ag(I)

Shentseva,

Usoltsev,

Korobeynikov

et al. 2024

Inorg. Chem.

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The rare examples of discrete anionic halobismuthates(III) with group 11 elements were obtained. Those are (3-MePyH) 6 [Bi 4 Cu 2 I 20 ] (1) and (3,5-MePyC 6 ) 3 [BiAgI 7 ] 2 (2) (3-MePyH = 3-methylpyridinium cation, 3,5-MePyC 6 =1,6bis(3,5-dimethylpyridinium)hexane dication). Both complexes were isolated as pure phases; the optical band gaps for 1 and 2 are 1.75 and 2.23 eV, respectively. 1 features one of the lowest optical band gap values among Bi/ Cu clusters. ■ EXPERIMENTAL SECTION Starting Materials. All starting components (Bi 2 O 3 , CuI, Ag 2 O, and 2,6-diMePy) were purchased from commercial sources and used without purification. 1,6-Bis(3,5-dimethylpyridinium)hexane dibromide ({(3,5-diMePy)(CH 2 ) 6 (3,5-diMePy)}Br 2 ) was synthesized via reaction between 3,5-dimethylpyridine and corresponding 1,6dibromohexane in acetonitrile. All syntheses were conducted in air.In all experiments, concentrated HI was used.Synthesis of 1 and 2. For 1, 46.6 mg (0.1 mmol) of Bi 2 O 3 and 39 μL (0.3 mmol) of 3-methylpyridinium were mixed in 1 mL of concentrated HI. The resulting solution was evaporated to dryness. Nineteen mg of CuI (0.1 mmol) was added to the residue and was dissolved in 3 mL of acetonitrile/acetone mixture (1:1) upon heating at 70 °C for 1 h. After complete dissolution of reactants, the solution was slowly cooled to room temperature. In 24 h, dark-red crystals formed. Yield: 72%.For 2, 23.3 mg (0.05 mmol) of Bi 2 O 3 , 11.6 mg of Ag 2 O (0.05 mmol), and 45 mg (0.1 mmol) of (3,5-MePy) 2 (CH 2 ) 6 Br 2 were dissolved in 7 mL of concentrated HI and acetonitrile mixture (3:4) upon heating 70 °C for 1 h. After complete dissolution of reactants, the solution was slowly cooled to room temperature. In 24 h, orange crystals formed. Yield: 76%.X-ray Diffractometry. The diffraction data for 1 and 2 were collected on a Bruker D8 Venture diffractometer (0.5°ω-and φscans, fixed-χ three circle goniometer, CMOS PHOTON III detector, Mo−I□S 3.0 microfocus source, focusing Montel mirrors, λ =

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Effect on Local Structure and Phase Transition of Perovskite-Type [N(CH3)4]2Zn1-xCuxBr4 (x = 0, 0.5, 0.7, and 1) Crystals with the Various Doping of Cu2+ Ions

Cited by 4 publications

References 25 publications

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

Structural Elucidation of Electrical and Optical Properties in Lead‐free Organic‐Inorganic Copper Bromide [(CH₃)₄N]₂CuBr₄ Single Crystals

Discrete Hexa- and Binuclear Heterometallic Iodobismuthate(III) Complexes with Cu(I) and Ag(I)

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Effect on Local Structure and Phase Transition of Perovskite-Type [N(CH3)4]2Zn1-xCuxBr4 (x = 0, 0.5, 0.7, and 1) Crystals with the Various Doping of Cu2+ Ions

Cited by 4 publications

References 25 publications

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics

Structural Elucidation of Electrical and Optical Properties in Lead‐free Organic‐Inorganic Copper Bromide [(CH3)4N]2CuBr4 Single Crystals

Discrete Hexa- and Binuclear Heterometallic Iodobismuthate(III) Complexes with Cu(I) and Ag(I)

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Structural Elucidation of Electrical and Optical Properties in Lead‐free Organic‐Inorganic Copper Bromide [(CH₃)₄N]₂CuBr₄ Single Crystals