Metal Hydrogen Fluorides

Opalovskii, A. A.; Fedotova, T. D.

doi:10.1070/rc1970v039n12abeh002307

Cited by 10 publications

(12 citation statements)

References 24 publications

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“…The IR spectrum of K[Mo 2 O 2 F 9 ] (Figure S11) shows bands at 451, 1015, 1037, 1101, 1157, 1743 and 2359 cm –1 . Previous studies report the IR bands of KF · 2HF to occur at 480 (ν 1 ), 1030–1150 (ν 2 ), 1780 (ν 3 ) 2000, and 2350 cm –1 , . The presence of similar bands in the spectrum of K[Mo 2 O 2 F 9 ] may arise from the presence of KF · 2HF in the product mixture.…”

Section: Resultsmentioning

confidence: 88%

“…In the IR spectra of Li[Mo 2 O 2 F 9 ] and Na[Mo 2 O 2 F 9 ], the deformation vibration ν 2 and the antisymmetric stretching vibration ν 3 of the bifluoride ion, HF 2 -, are clearly visible (refer to Table 8). [29,30] The presence of bifluoride and other [F(HF) n ] -(n = typically 2 to 4) impurities likely arise from the fact that the alkali metal fluorides were present in excess in the reaction mixtures. The IR spectrum of K[Mo 2 O 2 F 9 ] ( Figure S11) shows bands at 451, 1015, 1037, 1101, 1157, 1743 and 2359 cm -1 .…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…Previous studies report the IR bands of KF·2HF to occur at 480 (ν 1 ), 1030-1150 (ν 2 ), 1780 (ν 3 ) 2000, and 2350 cm -1 . [30,31] The presence of similar bands in the spectrum of K[Mo 2 O 2 F 9 ] may arise from the presence of KF·2HF in the product mixture. However, since the Mo-O stretching bands in the [Mo 2 O 2 F 9 ]anion occur in the region of 1000-1100 cm -1 , the bands arising from any KF·2HF would be overlapped with these bands.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

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Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

et al. 2019

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Previous studies performed on samples of MoOF4 dissolved in anhydrous hydrogen fluoride (aHF) solutions have indicated the presence of the [Mo2O2F9]– anion. Building upon this earlier work, MoOF4, and MF (M = Li–Cs) were dissolved in aHF solutions to produce M[Mo2O2F9] (M = Li–Cs) salts. Structural analysis of the obtained compounds was performed using single‐crystal X‐ray diffraction. This study provides the first single crystal structures for the [MoVI2O2F9]– anion. Additionally, IR and Raman spectroscopy were used to characterize each salt. These spectra were compared to calculated ones for the solid‐state structure of each salt using the DFT‐PBE0 density functional method. The calculated spectra were used to give band assignments in the experimentally obtained spectra.

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Section: Resultsmentioning

confidence: 88%

Section: Infrared Spectroscopymentioning

confidence: 99%

Section: Infrared Spectroscopymentioning

confidence: 99%

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Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

et al. 2019

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“…The H-F bond length equals 0.685(14) Å, which seems to be underestimated, whereas the donor-acceptor distance between the hydrogen-bonded fluorine atoms is 2.3970(6) Å. The three F-(μ 3 -F)-F angles equal 111.15(2), 111.16 (2), and 111.17(1)°a nd are essentially equivalent within the 3σ criterion. The central μ 3 -F atom is located at 0.7297(8) Å above a virtual leastsquares plane formed by the three other symmetry-equivalent fluorine atoms.…”

Section: Nah 4 Fmentioning

confidence: 89%

Syntheses and Crystal Structures of Sodium Hydrogen Fluorides NaF·nHF (n = 2, 3, 4)

Ivlev

Soltner

Karttunen

et al. 2017

Zeitschrift anorg allge chemie

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Abstract. A series of higher sodium hydrogen fluorides were synthesized and structurally characterized. Sodium tetrahydrogen pentafluoride, NaH 4 F 5 , crystallizes in space group type I4 1 /a with cell parameters a = 6.0275(4), c = 11.6208(13) Å, V = 422.19(7) Å 3 , Z = 4 at 100 K. Sodium trihydrogen tetrafluoride, NaH 3 F 4 , crystallizes in space group type R3 with cell parameters a = 6.5139(4), c = 13.4040(15) Å, V = 492.55(8) Å 3 , Z = 6 at 100 K. Sodium dihydrogen trifluoride, NaH 2 F 3 ,

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“…They have been studied in great detail : There are numerous data at disposal on their polymorphic transformation, melting behaviour and thermal stability [4][5][6][7].…”

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Thermal properties and structural features of alkali metal (K, Rb, Cs) and ammonium mixed bifluorides

Fedorov

Fedotova

1980

Journal of Thermal Analysis

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DTA and TG methods were used to study the melting, polymorphic transformation and thermal decomposition processes of alkali metal and ammonium mixed bifluorides formed by mutual replacement of the cations in the crystal lattice. We studied the structural features and the characteristics in the changes of thermal properties of individual compounds, solid solutions with unlimited solubility and solid solutions with limited solubility.Under normal conditions potassium, rubidium and caesium bifluorides are isostructural, crystallizing in the tetragonal system (symmetry group D~-I4/mcm), When subjected to heating, they undergo polymorphic transformation into the cubic phase: KHF2 and RbHF2 assume the structural type of NaC1 (O~-Fm3m), CaHF z that of CsCl, which -close to its melting temperature -passes presumably into the structure of the NaCI type [1,2]. The structure ofaimnonium bifluoride is defined by the presence of N-H... F type hydrogen bonds, besides the bifluoride ions. This structure corresponds to the symmetry group DTu -Pman [3].The thermal properties of these compounds are of interest both from the theoretical view and for practice. They have been studied in great detail : There are numerous data at disposal on their polymorphic transformation, melting behaviour and thermal stability [4][5][6][7].In the present paper we shall discuss thermal properties of mixed bifluorides. These are novel phases, which we were the first to prepare in system of the type MHF~-M'HF2-H20 (M and M' being K, Rb and Cs, resp.) [8 -10]. The X-ray patterns and the parameters of the elementary cells, as well as their dependence on composition were determined, and the structure of the compounds was studied in earlier work [8][9][10][11][12]. ExperimentalThe substances were synthetized from aqueous solutions, amounts being calculated from the data on the corresponding ternary systems [8,9] and identified by chemical analysis and X-ray analysis. For thermal analysis we used the derivatograph manufactured by MOM, with sample weights around 100 mg and heating 3*

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Metal Hydrogen Fluorides

Cited by 10 publications

References 24 publications

Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

Syntheses and Crystal Structures of Sodium Hydrogen Fluorides NaF·nHF (n = 2, 3, 4)

Thermal properties and structural features of alkali metal (K, Rb, Cs) and ammonium mixed bifluorides

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Metal Hydrogen Fluorides

Cited by 10 publications

References 24 publications

Lewis Acidic Behavior of MoOF4 towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

Lewis Acidic Behavior of MoOF4 towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

Syntheses and Crystal Structures of Sodium Hydrogen Fluorides NaF·nHF (n = 2, 3, 4)

Thermal properties and structural features of alkali metal (K, Rb, Cs) and ammonium mixed bifluorides

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Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions

Lewis Acidic Behavior of MoOF₄ towards the Alkali Metal Fluorides in Anhydrous Hydrogen Fluoride Solutions