Li2MnBr4(o‐rh.) – eine geordnete NaCl‐Defektstruktur des SnMn2S4‐Typs

Lutz, H. D.; Schneider, M.; Kuske, P.; Steiner, H.‐J.

doi:10.1002/zaac.19915920112

Cited by 9 publications

(9 citation statements)

References 19 publications

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“…[31][32][33][34][35][36][37][38][39][40][41][42] Generally, these Mn-halide vibrations have only weak intensities and typically appear in the region below 400 cm À1 . [43] As all of the Tf 2 N derivatives of the Mn-based ILs proved to be optically dense, their mid-IR spectra had to be recorded from solutions of the respective room temperature liquid ILs to trace any transmission.…”

mentioning

confidence: 99%

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Pitula

Mudring

2010

Chemistry A European J

117

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Several ionic liquids (ILs) based on complex manganate(II) anions with chloro, bromo, and bis(trifluoromethanesulfonyl)amido (Tf(2)N) ligands have been synthesized. As counterions, n-alkyl-methylimidazolium (C(n)mim) cations of different chain length (alkyl=ethyl (C(2)), propyl (C(3)), butyl (C(4)), hexyl (C(6))) were chosen. Except for the 1-hexyl-3-methylimidazolium ILs, all of the prepared compounds could be obtained in a crystalline state at room temperature. However, each of the compounds displayed a strong tendency to form a supercooled liquid. Generally, solidification via a glass transition took place below -40 degrees C. Consequently, all of these compounds can be regarded as ionic liquids. Depending on the local coordination environment of Mn(2+), green (tetrahedrally coordinated Mn(2+)) or red (octahedrally coordinated Mn(2+)) luminescence emission from the (4)T(G) level is observed. The local coordination of the luminescent Mn(2+) centre has been unequivocally established by UV/Vis as well as Raman and IR vibrational spectroscopies. Emission decay times measured at room temperature in the solid state (crystalline or powder) were generally a few ms, although, depending on the ligand, values of up to 25 ms were obtained. For the bromo compounds, the luminescence decay times proved to be almost independent of the physical state and the temperature. However, for the chloro- and bis(trifluoromethanesulfonyl)amido ILs, the emission decay times were found to be dependent on the temperature even in the solid state, indicating that the measured values are strongly influenced by nuclear motion and the vibration of the atoms. In the liquid state, the luminescence of tetrahedrally coordinated Mn(2+) could only be observed when the tetrachloromanganate ILs were diluted with the respective halide ILs. However, for [C(3)mim][Mn(Tf(2)N)(3)], in which Mn(2+) is in an octahedral coordination environment, a weak red emission from the pure compound was found even in the liquid state at elevated temperatures.

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confidence: 99%

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Pitula

Mudring

2010

Chemistry A European J

117

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“…(The somewhat smaller conductivities of the bromides compared to those of the chlorides are mainly due to the different crystal structures [9].) Because of decomposition of the ternary iodides at temperatures below 500 K ionic conducting lithium iodide material with conductivities quite higher than those of binary LiI doped with small amounts of bivalent metal ions, however, is not available at ambient temperature.…”

Section: Discussionmentioning

confidence: 99%

“…No compounds have been obtained in the systems LiI-MgI2 [3,4], LiI-CaI2 [4], LiICdI2 and LiI-HgI2 [ 5 ]. In analogy to the recently established ternary bromides LiEMgBr4 [6,7], LizMnBr4 [6,8,9 ], and LiECdBr4 [ 8 ], the existence of the corresponding iodides was expected. We therefore investigated the systems LiI-MnI2, LilCdI2, as well as LiI-PbI2 [ 10 ] by X-ray, high-temperature X-ray, and conductivity measurements.…”

Section: Introductionmentioning

confidence: 99%

Fast ionic conductivity of ternary iodides in the systems LiIMIII2 (MIIMn, Cd, Pb)

Lutz¹,

Zhang²,

Pfitzner³

1993

Solid State Ionics

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The phase relationships and electric conductivities of the ternary iodide systems LiI-MnI2 (Mn=Mn, Cd, Pb) have been studied by high-temperature X-ray measurements and impedance spectroscopy methods. Whereas mutual solubility of LiI and Mnl2 is negligible at any temperature deficient NaCl-type mixed crystals Lit_xM[~.nxI (MIX= Mn, Cd, Pb) are formed at temperature above 540 K, which, however, cannot be quenched to ambient temperature. The solid solutions obtained exhibit high ionic conductivity, e.g. 1 × 10-t, 3 × 10-2 and 7 × 10-2 f~-~ cm-~ at 570 K for materials like Li2CdI4, Li2Pbl4, and Li4PbI6, respectively.

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“…The assignment of the observed bands to species A 1g , E g , and F 2g allowed with the Raman experiments (9,13) was performed by singlecrystal Raman studies (8). In connection with the interpretation of the Raman spectra of the related SnMn 2 S 4 -type halides (14), we doubted this assignment in the meantime.…”

Section: Introductionmentioning

confidence: 97%