1
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Smółka S, Mączka M, Drozdowski D, Stefańska D, Gągor A, Sieradzki A, Zaręba JK, Ptak M. Effect of Dimensionality on Photoluminescence and Dielectric Properties of Imidazolium Lead Bromides. Inorg Chem 2022; 61:15225-15238. [PMID: 36102245 PMCID: PMC9516686 DOI: 10.1021/acs.inorgchem.2c02496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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Hybrid organic–inorganic
lead halide perovskites have emerged
as promising materials for various applications, including solar cells,
light-emitting devices, dielectrics, and optical switches. In this
work, we report the synthesis, crystal structures, and linear and
nonlinear optical as well as dielectric properties of three imidazolium
lead bromides, IMPbBr3, IM2PbBr4,
and IM3PbBr5 (IM+ = imidazolium).
We show that these compounds exhibit three distinct structure types.
IMPbBr3 crystallizes in the 4H-hexagonal perovskite structure
with face- and corner-shared PbBr6 octahedra (space group P63/mmc at 295 K), IM2PbBr4 adopts a one-dimensional (1D) double-chain structure
with edge-shared octahedra (space group P1̅
at 295 K), while IM3PbBr5 crystallizes in the
1D single-chain structure with corner-shared PbBr6 octahedra
(space group P1̅ at 295 K). All compounds exhibit
two structural phase transitions, and the lowest temperature phases
of IMPbBr3 and IM3PbBr5 are noncentrosymmetric
(space groups Pna21 at 190 K and P1 at 100 K, respectively), as confirmed by measurements
of second-harmonic generation (SHG) activity. X-ray diffraction and
thermal and Raman studies demonstrate that the phase transitions feature
an order–disorder mechanism. The only exception is the isostructural P1̅ to P1̅ phase transition
at 141 K in IM2PbBr4, which is of a displacive
type. Dielectric studies reveal that IMPbBr3 is a switchable
dielectric material, whereas IM3PbBr5 is an
improper ferroelectric. All compounds exhibit broadband, highly shifted
Stokes emissions. Features of these emissions, i.e., band gap and excitonic absorption, are discussed in relation to
the different structures of each composition. Three imidazolium lead bromides of various
chemical compositions
and crystal structures display broadband photoluminescence that can
be tuned from bluish-green to orange. All compounds exhibit two structural
phase transitions, which lead to interesting optical and electrical
properties such SHG activity, ferroelectricity, or dielectric switching.
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Affiliation(s)
- Szymon Smółka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
| | - Mirosław Mączka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
| | - Dawid Drozdowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
| | - Dagmara Stefańska
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
| | - Anna Gągor
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
| | - Adam Sieradzki
- Department of Experimental Physics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370Wrocław, Poland
| | - Jan K. Zaręba
- Institute of Advanced Materials, Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370Wrocław, Poland
| | - Maciej Ptak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422Wrocław, Poland
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García-Ben J, McHugh LN, Bennett TD, Bermúdez-García JM. Dicyanamide-perovskites at the edge of dense hybrid organic–inorganic materials. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214337] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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3
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Ptak M, Sieradzki A, Šimėnas M, Maczka M. Molecular spectroscopy of hybrid organic–inorganic perovskites and related compounds. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214180] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Mechanism of Unusual Isosymmetric Order-Disorder Phase Transition in [Dimethylhydrazinium]Mn(HCOO) 3 Hybrid Perovskite Probed by Vibrational Spectroscopy. MATERIALS 2021; 14:ma14143984. [PMID: 34300914 PMCID: PMC8303174 DOI: 10.3390/ma14143984] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/13/2021] [Accepted: 07/14/2021] [Indexed: 12/25/2022]
Abstract
[DMHy]Mn(HCOO)3 (DMHy+ = dimethylhydrazinium cation) is an example of an organic–inorganic hybrid adopting perovskite-like architecture with the largest organic cation used so far in the synthesis of formate-based hybrids. This compound undergoes an unusual isosymmetric phase transition at 240 K on heating. The mechanism of this phase transition has a complex nature and is mainly driven by the ordering of DMHy+ cations and accompanied by a significant distortion of the metal–formate framework in the low temperature (LT) phase. In this work, the Density Functional Theory (DFT) calculations and factor group analysis are combined with experimental temperature-dependent IR and Raman studies to unequivocally assign the observed vibrational modes and shed light on the details of the occurring structural changes. The spectroscopic data show that this first-order phase transition has a highly dynamic nature, which is a result of balanced interplay combining re-arrangement of the hydrogen bonds and ordering of DMHy+ cations. The tight confinement of organic cations forces simultaneous steric deformation of formate ions and the MnO6 octahedra.
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Ptak M, Svane KL, Collings IE, Paraguassu W. Effect of Alkali and Trivalent Metal Ions on the High-Pressure Phase Transition of [C 2H 5NH 3]M I 0.5M III 0.5(HCOO) 3 (M I = Na, K and M III = Cr, Al) Heterometallic Perovskites. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:6337-6348. [PMID: 32952769 PMCID: PMC7497711 DOI: 10.1021/acs.jpcc.0c00372] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/18/2020] [Indexed: 06/11/2023]
Abstract
We report the high-pressure behavior of two perovskite-like metal formate frameworks with the ethylammonium cation (EtAKCr and EtANaAl) and compare them to previously reported data for EtANaCr. High-pressure single-crystal X-ray diffraction and Raman data for EtAKCr show the occurrence of two high-pressure phase transitions observed at 0.75(16) and 2.4(2) GPa. The first phase transition involves strong compression and distortion of the KO6 subnetwork followed by rearrangement of the -CH2CH3 groups from the ethylammonium cations, while the second involves octahedral tilting to further reduce pore volume, accompanied by further configurational changes of the alkyl chains. Both transitions retain the ambient P21/n symmetry. We also correlate and discuss the influence of structural properties (distortion parameters, bulk modulus, tolerance factors, and compressibility) and parameters calculated by using density functional theory (vibrational entropy, site-projected phonon density of states, and hydrogen bonding energy) on the occurrence and properties of structural phase transitions observed in this class of metal formates.
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Affiliation(s)
- Maciej Ptak
- Institute
of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
| | - Katrine L. Svane
- Department
of Energy Conversion and Storage, Technical
University of Denmark, Kgs. Lyngby, Denmark
- Department
of Chemistry, University of Bath, Bath, U.K.
| | - Ines E. Collings
- European
Synchrotron Radiation Facility, Grenoble, France
- Empa
- Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
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6
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Yang Z, Cai G, Bull CL, Tucker MG, Dove MT, Friedrich A, Phillips AE. Hydrogen-bond-mediated structural variation of metal guanidinium formate hybrid perovskites under pressure. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2019; 377:20180227. [PMID: 31130096 PMCID: PMC6562345 DOI: 10.1098/rsta.2018.0227] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 03/14/2019] [Indexed: 06/09/2023]
Abstract
The hybrid perovskites are coordination frameworks with the same topology as the inorganic perovskites, but with properties driven by different chemistry, including host-framework hydrogen bonding. Like the inorganic perovskites, these materials exhibit many different phases, including structures with potentially exploitable functionality. However, their phase transformations under pressure are more complex and less well understood. We have studied the structures of manganese and cobalt guanidinium formate under pressure using single-crystal X-ray and powder neutron diffraction. Under pressure, these materials transform to a rhombohedral phase isostructural to cadmium guanidinium formate. This transformation accommodates the reduced cell volume while preserving the perovskite topology of the framework. Using density-functional theory calculations, we show that this behaviour is a consequence of the hydrogen-bonded network of guanidinium ions, which act as struts protecting the metal formate framework against compression within their plane. Our results demonstrate more generally that identifying suitable host-guest hydrogen-bonding geometries may provide a route to engineering hybrid perovskite phases with desirable crystal structures. This article is part of the theme issue 'Mineralomimesis: natural and synthetic frameworks in science and technology'.
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Affiliation(s)
- Zhengqiang Yang
- School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK
| | - Guanqun Cai
- School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK
| | - Craig L. Bull
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
| | - Matthew G. Tucker
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
| | - Martin T. Dove
- School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK
| | - Alexandra Friedrich
- Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main 60438, Germany
| | - Anthony E. Phillips
- School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK
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7
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Growth and Property Investigations of Two Organic–Inorganic Hybrid Molecular Crystals with High Thermal Stability: 4-Iodoanilinium perchlorate 18-crown-6 and 4-Iodoanilinium Borofluorate 18-crown-6. CRYSTALS 2019. [DOI: 10.3390/cryst9040207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Two new organic–inorganic hybrid molecular single crystals, 4-Iodoanilinium perchlorate 18-crown-6 (1) and 4-Iodoanilinium borofluorate 18-crown-6 (2), with large sizes and high thermal stability were successfully synthesized by solution method. Their structures, phase purities, thermal stability, dielectric, absorption and fluorescence spectra were systematically investigated for potential applications. Compounds 1 and 2 crystallize in orthorhombic crystal system, in same space group, namely Pnma. The thermal measurements shown 1 and 2 maintain high thermal stability up to 150 °C. The temperature dependency of dielectric constant was studied, and no distinct anomaly was observed. The band gap were calculated to be 3.38 eV and 3.57 eV for 1 and 2, respectively, slightly smaller than those of layer perovskite (benzylammonium)2PbCl4 semiconducting materials, which have potential applications in optoelectronic detection field. The investigations throw light on the semiconductor properties of organic–inorganic hybrid crown type material and provide two types of crown compounds with high thermal stability.
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8
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Ptak M, Svane KL, Walsh A, Paraguassu W. Stability and flexibility of heterometallic formate perovskites with the dimethylammonium cation: pressure-induced phase transitions. Phys Chem Chem Phys 2019; 21:4200-4208. [DOI: 10.1039/c8cp07131d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report the high-pressure Raman studies and DFT calculations of DMANaCr and DMAKCr perovskite formates.
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Affiliation(s)
- Maciej Ptak
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | | | - Aron Walsh
- Department of Materials, Imperial College London
- London
- UK
- Department of Materials Science and Engineering, Yonsei University
- Seoul
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9
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Ptak M, Zarychta B, Stefańska D, Ciupa A, Paraguassu W. Novel bimetallic MOF phosphors with an imidazolium cation: structure, phonons, high- pressure phase transitions and optical response. Dalton Trans 2019; 48:242-252. [DOI: 10.1039/c8dt04246b] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis, high-pressure phase transitions and optical properties of novel bimetallic perovskite-type MOFs with imidazolium ions.
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Affiliation(s)
- Maciej Ptak
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | | | - Dagmara Stefańska
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | - Aneta Ciupa
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
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10
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Hill JA, Murray CA, Tang CC, Thygesen PMM, Thompson AL, Goodwin AL. Inorganic co-crystal formation and thermal disproportionation in a dicyanometallate ‘superperovskite’. Chem Commun (Camb) 2019; 55:5439-5442. [DOI: 10.1039/c8cc10277e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The dicyanometallate superperovskite co-crystal [NBu4]Mn[Au(CN)2]3·[NBu4]ClO4 illustrates a new type of structural and phase complexity accessible to dicyanometallate perovskites.
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Affiliation(s)
- Joshua A. Hill
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford OX1 3QR
- UK
| | - Claire A. Murray
- Diamond Light Source Ltd
- Harwell Science and Innovation Campus
- Didcot
- UK
| | - Chiu C. Tang
- Diamond Light Source Ltd
- Harwell Science and Innovation Campus
- Didcot
- UK
| | - Peter M. M. Thygesen
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford OX1 3QR
- UK
| | - Amber L. Thompson
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford OX1 3QR
- UK
| | - Andrew L. Goodwin
- Department of Chemistry
- University of Oxford
- Inorganic Chemistry Laboratory
- Oxford OX1 3QR
- UK
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11
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Mączka M, Pasińska K, Ptak M, Paraguassu W, da Silva TA, Sieradzki A, Pikul A. Effect of solvent, temperature and pressure on the stability of chiral and perovskite metal formate frameworks of [NH 2NH 3][M(HCOO) 3] (M = Mn, Fe, Zn). Phys Chem Chem Phys 2018; 18:31653-31663. [PMID: 27840876 DOI: 10.1039/c6cp06648h] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis, crystal structure, and thermal, Raman, infrared and magnetic properties of [NH2NH3][M(HCOO)3] (HyM) compounds (M = Mn, Zn, Fe). Our results show that synthesis from methanol solution leads to perovskite polymorphs while that from 1-methyl-2-pyrrolidinone or its mixture with methanol allows obtaining chiral polymorphs. Perovskite HyFe, chiral HyFe and chiral HyMn undergo phase transitions at 347, 336 and 296 K, respectively, with symmetry changes from Pnma to Pna21, P63 to P212121 and P63 to P21. X-ray diffraction and Raman studies show that the phase transitions are governed by dynamics of the hydrazinium ions. Low-temperature magnetic studies show that these compounds exhibit magnetic ordering below 9-12.5 K. Since the low-temperature structures of chiral HyMn and perovskite HyFe are polar, these compounds are possible multiferroic materials. We also report high-pressure Raman scattering studies of chiral and perovskite HyZn, which show much larger stiffness of the latter phase. These studies also show that the ambient pressure polar phases are stable up to at least 1.4 and 4.1 GPa for the chiral and perovskite phase, respectively. Between 1.4 and 2.0 GPa (for chiral HyZn) and 4.1 and 5.2 GPa (for perovskite HyZn) pressure-induced transitions are observed associated with changes in the zinc-formate framework. Strong broadening of Raman bands and the decrease in their number for the high-pressure phase of chiral HyZn suggest that this phase is disordered and has higher symmetry than the ambient pressure one.
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Affiliation(s)
- Mirosław Mączka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland.
| | - Katarzyna Pasińska
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland.
| | - Maciej Ptak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland.
| | - Waldeci Paraguassu
- Faculdade de Física, Universidade Federal do Pará, 66075-110, Belém, PA, Brazil
| | | | - Adam Sieradzki
- Department of Experimental Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland
| | - Adam Pikul
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland.
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12
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Ptak M, Stefańska D, Gągor A, Svane KL, Walsh A, Paraguassu W. Heterometallic perovskite-type metal–organic framework with an ammonium cation: structure, phonons, and optical response of [NH4]Na0.5CrxAl0.5−x(HCOO)3 (x = 0, 0.025 and 0.5). Phys Chem Chem Phys 2018; 20:22284-22295. [DOI: 10.1039/c8cp03788d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis, crystal structure, dielectric, vibrational and emission spectra of heterometallic perovskite-type AmNaCr and AmNaAl MOFs.
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Affiliation(s)
- Maciej Ptak
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | - Dagmara Stefańska
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | - Anna Gągor
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- Wrocław
- Poland
| | - Katrine L. Svane
- Department of Chemistry
- University of Bath
- Bath
- UK
- Department of Energy Conversion and Storage
| | - Aron Walsh
- Department of Materials
- Imperial College London
- London
- UK
- Department of Materials Science and Engineering
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13
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Donlan EA, Boström HLB, Geddes HS, Reynolds EM, Goodwin AL. Compositional nanodomain formation in hybrid formate perovskites. Chem Commun (Camb) 2017; 53:11233-11236. [PMID: 28956886 DOI: 10.1039/c7cc06928f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis and structural characterisation of three mixed-metal formate perovskite families [C(NH2)3]CuxM1-x(HCOO)3 (M = Mn, Zn, Mg). Using a combination of infrared spectroscopy, non-negative matrix factorization, and reverse Monte Carlo refinement, we show that the Mn- and Zn-containing compounds support compositional nanodomains resembling the polar nanoregions of conventional relaxor ferroelectrics. The M = Mg family exhibits a miscibility gap that we suggest reflects the limiting behaviour of nanodomain formation.
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Affiliation(s)
- Edwina A Donlan
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, UK.
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14
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Zeng Y, Huang RK, Du ZY, He CT, Zhang WX, Chen XM. Matching of Host–Guest Symmetry/Orientation and Molecular Dynamics in Two Double Perovskite-Like Azido Coordination Polymers. Inorg Chem 2017; 56:9946-9953. [DOI: 10.1021/acs.inorgchem.7b01478] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ying Zeng
- Key
Laboratory of Jiangxi University for Functional Materials Chemistry,
College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
- MOE
Key Laboratory of Bioinorganic and Synthetic Chemistry, School of
Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Rui-Kang Huang
- MOE
Key Laboratory of Bioinorganic and Synthetic Chemistry, School of
Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Zi-Yi Du
- Key
Laboratory of Jiangxi University for Functional Materials Chemistry,
College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Chun-Ting He
- MOE
Key Laboratory of Bioinorganic and Synthetic Chemistry, School of
Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Wei-Xiong Zhang
- MOE
Key Laboratory of Bioinorganic and Synthetic Chemistry, School of
Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xiao-Ming Chen
- MOE
Key Laboratory of Bioinorganic and Synthetic Chemistry, School of
Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
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15
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Duncan HD, Beake EOR, Playford HY, Dove MT, Phillips AE. Local structure of a switchable dielectric Prussian blue analogue. CrystEngComm 2017. [DOI: 10.1039/c7ce01883e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two crystallographically similar phases of a dielectric framework material differ markedly in the rigidity of the cyanide framework.
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Affiliation(s)
- Helen D. Duncan
- School of Physics and Astronomy
- Queen Mary University of London
- London E1 4NS
- UK
| | - Edward O. R. Beake
- School of Physics and Astronomy
- Queen Mary University of London
- London E1 4NS
- UK
| | - Helen Y. Playford
- ISIS Neutron and Muon Source
- Rutherford Appleton Laboratory
- Didcot OX11 0QX
- UK
| | - Martin T. Dove
- School of Physics and Astronomy
- Queen Mary University of London
- London E1 4NS
- UK
| | - Anthony E. Phillips
- School of Physics and Astronomy
- Queen Mary University of London
- London E1 4NS
- UK
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16
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Zeng Q, Zhang J, Cheng H, Chen L, Qi Z. Corrosion properties of steel in 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid systems for desulfurization application. RSC Adv 2017. [DOI: 10.1039/c7ra09137k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The corrosivity of [BMIM]HSO4-based systems for desulfurization applications were investigated by weight loss and surface analyses.
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Affiliation(s)
- Qian Zeng
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Jinwei Zhang
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Hongye Cheng
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Lifang Chen
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Zhiwen Qi
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
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17
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Trzebiatowska M, Zarychta B, Pikul A, Mączka M, Peksa P, Poprawski R. Polar metal–formate frameworks templated with 1,2-diaminoethane–water assemblies showing ferromagnetic and ferroelectric properties. Phys Chem Chem Phys 2017. [DOI: 10.1039/c7cp02301d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A set of formate frameworks templated with 1,2-diaminoethane-water assemblies of the formula: [NH3(CH2)2NH3]M2(HCOO)6·H2O (M = Mg, Mn, Co, Ni, Zn) has been synthesized. They show room-temperature ferroelectricity and ferromagnetic ordering below 35 K.
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Affiliation(s)
- Monika Trzebiatowska
- Institute of Low Temperature and Structure Research Polish Academy of Sciences
- 50-422 Wrocław
- Poland
| | | | - Adam Pikul
- Institute of Low Temperature and Structure Research Polish Academy of Sciences
- 50-422 Wrocław
- Poland
| | - Mirosław Mączka
- Institute of Low Temperature and Structure Research Polish Academy of Sciences
- 50-422 Wrocław
- Poland
| | - Paulina Peksa
- Division of Experimental Physics
- Faculty of Fundamental Problems of Technology
- Wrocław University of Technology
- 50-370 Wrocław
- Poland
| | - Ryszard Poprawski
- Division of Experimental Physics
- Faculty of Fundamental Problems of Technology
- Wrocław University of Technology
- 50-370 Wrocław
- Poland
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Mączka M, Janczak J, Trzebiatowska M, Sieradzki A, Pawlus S, Pikul A. Synthesis and temperature-dependent studies of a perovskite-like manganese formate framework templated with protonated acetamidine. Dalton Trans 2017. [DOI: 10.1039/c7dt01251a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Acetamidinium manganese formate undergoes a phase transition from the Imma to the P21/n structure at 304 K and magnetic order below 9 K.
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Affiliation(s)
- Mirosław Mączka
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
| | - Jan Janczak
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
| | - Monika Trzebiatowska
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
| | - Adam Sieradzki
- Department of Experimental Physics
- Wrocław University of Technology
- Wrocław
- Poland
| | - Sebastian Pawlus
- Institute of Physics
- University of Silesia
- 40-007 Katowice
- Poland
- Silesian Center for Education and Interdisciplinary Research
| | - Adam Pikul
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
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19
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Evans NL, Thygesen PMM, Boström HLB, Reynolds EM, Collings IE, Phillips AE, Goodwin AL. Control of Multipolar and Orbital Order in Perovskite-like [C(NH2)3]CuxCd1-x(HCOO)3 Metal-Organic Frameworks. J Am Chem Soc 2016; 138:9393-6. [PMID: 27414161 DOI: 10.1021/jacs.6b05208] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We study the compositional dependence of molecular orientation (multipolar) and orbital (quadrupolar) order in the perovskite-like metal-organic frameworks [C(NH2)3]CuxCd1-x(HCOO)3. Upon increasing the fraction x of Jahn-Teller-active Cu(2+), we observe an orbital disorder/order transition and a multipolar reorientation transition, each occurring at distinct critical compositions xo = 0.45(5) and xm = 0.55(5). We attribute these transitions to a combination of size, charge distribution, and percolation effects. Our results establish the accessibility in formate perovskites of novel structural degrees of freedom beyond the familiar dipolar terms responsible for (anti)ferroelectric order. We discuss the implications of cooperative quadrupolar and multipolar states for the design of relaxor-like hybrid perovskites.
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Affiliation(s)
- Nicole L Evans
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K
| | - Peter M M Thygesen
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K
| | - Hanna L B Boström
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K
| | - Emily M Reynolds
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K
| | - Ines E Collings
- Laboratory of Crystallography, University of Bayreuth , D-95440 Bayreuth, Germany
| | - Anthony E Phillips
- School of Physics and Astronomy, Queen Mary, University of London , 327 Mile End Road, London E1 4NS, U.K
| | - Andrew L Goodwin
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K
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20
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Mączka M, Ptak M, Pawlus S, Paraguassu W, Sieradzki A, Balciunas S, Simenas M, Banys J. Temperature- and pressure-dependent studies of niccolite-type formate frameworks of [NH3(CH2)4NH3][M2(HCOO)6] (M = Zn, Co, Fe). Phys Chem Chem Phys 2016; 18:27613-27622. [DOI: 10.1039/c6cp05834e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural changes occurring in [H3N(CH2)4NH3][M2(HCOO)6] (M = Zn, Co, Fe) niccolites due to temperature- and pressure-induced transitions were monitored by dielectric, IR and Raman spectroscopy.
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Affiliation(s)
- Mirosław Mączka
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
| | - Maciej Ptak
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław 2
- Poland
| | | | | | - Adam Sieradzki
- Department of Experimental Physics
- Wrocław University of Technology
- Wrocław
- Poland
| | | | - Mantas Simenas
- Faculty of Physics
- Vilnius University
- LT-10222 Vilnius
- Lithuania
| | - Juras Banys
- Faculty of Physics
- Vilnius University
- LT-10222 Vilnius
- Lithuania
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21
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Xu WJ, Du ZY, Zhang WX, Chen XM. Structural phase transitions in perovskite compounds based on diatomic or multiatomic bridges. CrystEngComm 2016. [DOI: 10.1039/c6ce01485b] [Citation(s) in RCA: 127] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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