TG-FTIR, DSC and quantum chemical studies of the thermal decomposition of quaternary methylammonium halides

Sawicka, Marlena; Storoniak, Piotr; Skurski, Piotr; Błażejowski, Jerzy; Rak, Janusz

doi:10.1016/j.chemphys.2005.11.023

Cited by 41 publications

(36 citation statements)

References 45 publications

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“…These results are in agreement with theoretical data for TMA ? I -according to quantum-chemical calculations [5]. Intensity of all this peaks increases during heating due to accumulation of decomposition products, but the most significant product of organic part oxidation is still CO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Various properties of ammonium halides were wellinvestigated in order to understand the trends in Cl -, Br -, Irow [5,6]. Iodide derivatives take the unique place in this row as they can form not only monoiodide salts but also a wide range of polyiodides R 4 NI n [7].…”

Section: Introductionmentioning

confidence: 99%

“…So TMA iodides were chosen as the objects of our interest to show the influence of crystal packing, iodine quantity, and intermolecular interaction on thermal decomposition. Tetramethylammonium monoiodide decomposition was thoroughly studied [5]. It has been shown that its degradation goes in one step, volatilization starts at 300°C and ends above 350°C.…”

Section: Introductionmentioning

confidence: 99%

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Thermal decomposition of tetraalkylammonium iodides

Yushina

Rudakov

Krivtsov

et al. 2014

J Therm Anal Calorim

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A number of tetramethylammonium (TMA) iodides, including mono-, tri-, and pentaiodide, were synthesized. Thermal decomposition of samples was investigated by simultaneous TG-DSC analysis accompanied by gaseous IRand mass-spectrometry analyses. Two different reaction pathways have been observed for TMA pentaiodide at different heating rates. At low heating rates (1-5 K min -1 ), a gradual mass loss takes place and a stability plateau due to monoiodide formation exists on TG curve. At high heating rates (10, 15 and 7 K min -1 as the in-between stage), there are only two peaks on DTG curve (instead of three for lower heating rates) and no monoiodide formation is observed as the sample decomposes completely before 350°C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal decomposition of tetraalkylammonium iodides

Yushina

Rudakov

Krivtsov

et al. 2014

J Therm Anal Calorim

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“…Decomposition of CH 3 NH 3 + is more likely to happen during the rapid formation of MAPbI 3 from precursor materials. [161] Sawicka et al claimed that methyl ammonium halides decompose into methyl halides and neutral amines take places at 600 K. [162] The realization of a hybrid perovskite from a lead dihalide and an organic halide is anticipated to release 0.1 eV per unit cell, [163] so close to the site of active perovskite creation there may be sufficient free energy to decompose some MAI into NH 3 and CH 3 I. Since MAI intercalates the lead dihalide prior to establishing the perovskite phase, [164] it is relatively feasible that if MAI decomposition happens, it will occur within either the PbCl 2 or PbI 2 precursor that the products, especially the CH 3 I, might be trapped in the final perovskite structure.…”

Section: Thermally Induced Chemical Decompositionmentioning

confidence: 99%

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Yusoff

Nazeeruddin

2017

Advanced Energy Materials

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ruthenium molecular dye, wide absorption range, direct and tunable bandgaps, superior charge carrier mobility, and long carrier diffusion length. [6,[43][44][45] Although it has been synthesized for over 100 years, Mitzi et al. were the first to investigate the electrical properties of tin-based perovskite in 1994, [46] which was later used in numerous devices, including field effect transistors (FETs) and LEDs. [47][48][49] The attention toward metal halide perovskites sparked yet again in 2009, [42] and they were later named one of the most promising emerging technologies in 2016. In brief, metal halide perovskites can be divided into two types based on their crystal structure motif: (i) 3D-structured perovskite (AMX 3 ) and (ii) 2D-structured perovskite (A 2 MX 4 ). The structure of the perovskite could either be 2D or 3D, while the dimensions of the perovskite probably belong to 0D-3D. The term "perovskite" implies to the general class of materials derived from an elemental composition of AMX 3 and demonstrates the crystal structure of perovskite crystal CaTiO 3 , where the divalent metal M resides at the body center and surrounded by six X-anions located at the face centers in an octahedral cluster. The MX 6 in the octahedral cluster may form an extended 3D structure by all-corner-connected type with A-cation sitting at the center. It could also form a 2D perovskite when the 3D perovskite network is cut into one-layer-thick slices along the 〈100〉 direction and separates them apart. In principle, 2D perovskite is the easiest to synthesize because of its natural layered structure, which is held together by weak van der Waals forces. Dou et al. reported the large-scale synthesis of the monolayer (C 4 H 9 NH 3 ) 2 -PbBr 4 by a chemical method. [50] Along the same lines, several groups have prepared and characterized nanomaterials composed of various forms of perovskites. [51][52][53] Also, our group has recently successfully prepared a low-dimensional mixed 2D/3D perovskite using the protonated salt of amino valeric acid iodide (AVAI) as an organic precursor mixed with PbI 2 , in which a yellowish film was containing needle-like crystallite formed. [54] In this topical review, we present the latest advances in the synthesis of low-dimensional perovskites and the growth mechanism to develop a strategy to achieve best performing devices. Later, we focus the instability and a cost-effective solution to circumvent this problem, which is vital for the eventual deployment of perovskite solar cells to consumers market. We present an analysis of the origins for instability in perovskite solar cells, and present a summary of the main achievements and possible future developments of these low-dimensional perovskite. [2,55] Perovskite solar cells have been heralded as one of the most promising emerging technologies in 2016 because of the very high power conversion efficiency of 22% and the low cost of generating electricity compared to even fossil fuels. These are formed with various dimensionalities and can be fully mani...

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“…These results indicated clearly that under the carbonylation condition, tetramethylammonium iodide was decomposed into trimethylamine and methyl iodide. The same unimolecular decomposition of tetramethylammonium iodide was reported experimentally and theoretically [17]. Therefore, it was concluded that some of DMAC produced from the carbonylation of trimethylamine was transformed into MAA and DMF with increasing pressure of reactor due to the presence of methyl iodide, which was provided from the unimolecular decomposition of tetramethylammonium iodide in reaction medium during the carbonylation reaction (Equation (7)).…”

Section: Transformation Of Dmac Into Maa and Dmf In The Presence Of Tmentioning

confidence: 56%

Two Carbonylations of Methyl Iodide and Trimethylamine to Acetic acid and N,N-Dimethylacetamide by Rhodium(I) Complex: Stability of Rhodium(I) Complex under Anhydrous Condition

Hong

2015

Catalysts

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Rhodium(I)-complex [Rh(CO)2I2− ] (1) catalyzed two carbonylations of methyl iodide and trimethylamine in NMP (1-methyl-2-pyrolidone) to acetic acid and DMAC (N,N-dimethylacetamide) in the presence of calcium oxide and water. The carbonylation of trimethylamine continued during the carbonylation and consumption of methyl iodide. In total, 183.8 mmol of carbonylated products was produced while consuming 24.1 mmol methyl iodide via acetic acid formation. These results clearly indicated that there were two carbonylation routes of trimethylamine and methyl iodide and the carbonylation rate of trimethylamine was faster than that of methyl iodide. Rhodium(I)-complex [Rh(CO)2I2] − (1) in the presence of trimethylamine was stable enough to be used 25 times with TON (Turnover Number) of 368 for DMAC and TON of 728 for trimethylamine. Inner-sphere reductive elimination in stepwise procedure was suggested for the formation of DMAC instead of acyl iodide intermediate under anhydrous condition.

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TG-FTIR, DSC and quantum chemical studies of the thermal decomposition of quaternary methylammonium halides

Cited by 41 publications

References 45 publications

Thermal decomposition of tetraalkylammonium iodides

Thermal decomposition of tetraalkylammonium iodides

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Two Carbonylations of Methyl Iodide and Trimethylamine to Acetic acid and N,N-Dimethylacetamide by Rhodium(I) Complex: Stability of Rhodium(I) Complex under Anhydrous Condition

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