Li2TeS3 and Li2TeSe3: Preparation, Crystal Structure and Impedance Spectroscopic Characterization

Preitschaft, Christian; Zabel, Manfred; Pfitzner, Arno

doi:10.1002/zaac.200500007

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…Three short distances are between 2.4869 and 2.5131 Å, whereas the distances to the second-nearest neighbors range from 3.545 to 3.658 Å. A comparison of these direct contacts and the mean distances to next-nearest neighbors d̅ sec (Te–Se) in the compounds Li 2 TeSe 3 (2.513 Å) or K 2 TeSe 3 (2.491 Å) and the mean distances d̅ sec (Te–Se) in M 2 TeSe 3 show a reduction of d with increasing size and electropositivity of the cation. , …”

Section: Results and Discussionmentioning

confidence: 75%

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Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

et al. 2015

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Pure samples of Na 2 TeS 3 and Na 2 TeSe 3 were synthesized by the reactions of stoichiometric amounts of the elements Na, Te, and Q (Q = S, Se) in the ratio 2:1:3. Both compounds are highly air-and moisture-sensitive. The crystal structures were determined by singlecrystal X-ray diffraction. Yellow Na 2 TeS 3 crystallizes in the space group P2 1 /c. Na 2 TeSe 3 exists in a low-temperature modification (Na 2 TeSe 3 -mP24, space group P2 1 /c) and a high-temperature modification (Na 2 TeSe 3 -mC48, space group C2/c); both modifications are red. Density functional theory calculations confirmed the coexistence of both modifications of Na 2 TeSe 3 because they are very close in energy (ΔE = 0.18 kJ mol −1 ). To the contrary, hypothetic Na 2 TeS 3 -mC48 is significantly less favored (ΔE = 1.8 kJ mol −1 ) than the primitive modification. Na 2 TeS 3 and Na 2 TeSe 3 -mP24 are isotypic to Li 2 TeS 3 , whereas Na 2 TeSe 3 -mC48 crystallizes in its own structure type, which was first described by Eisenmann and Zagler. The title compounds have two common structure motifs. Trigonal TeQ 3 pyramids form layers, and the Na atoms are surrounded by a distorted octahedral environment of chalcogen atoms. Raman spectra are dominated by the vibration modes of the TeQ 3 units. The activation energies of the total conductivity of the title compounds range between 0.68 eV (Na 2 TeS 3 ) and 1.1 eV (Na 2 TeSe 3 ). Direct principal band gaps of 1.20 and 1.72 eV were calculated for Na 2 TeSe 3 and Na 2 TeS 3 , respectively. The optical band gaps are in the range from 1.38 eV for Li 2 TeSe 3 to 2.35 eV for Na 2 TeS 3 .

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Section: Results and Discussionmentioning

confidence: 75%

“…Thus, they range between 100.9° and 101.1° in Na 2 TeS 3 . They are larger than those in Li 2 TeS 3 (99.2–100.5°) and smaller than those in K 2 TeS 3 (102.1–103.1°) and Cs 2 TeS 3 (102.7–106.9°). − …”

Section: Results and Discussionmentioning

confidence: 82%

Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

et al. 2015

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“…Moreover, the above‐mentioned cesium–tellurium distance is smaller than the 402 pm between these two particles involved in the face‐attached thiotellurate(IV) η 3 ‐ligand in the same polyhedron around (Cs1) + . However, it can be observed from corresponding A 2 [TeS 3 ] data that the distance between tellurium centers of the next independent [TeS 3 ] 2– ligand to an alkali‐metal cation increases as one moves from Li + to K + (430 pm for A = Li and 483 pm for A = K) 2,3. The only comprehensible interaction between tellurium(IV) of these special [TeS 3 ] 2– anions and Cs + occurs through the lone‐pair electrons.…”

Section: Resultsmentioning

confidence: 99%

“…Particularly those with the alkali and alkaline‐earth metals as well as thallium as counter cations are structurally well described. So chalcogenotellurates(IV) such as A 2 [Te Ch 3 ] ( A = Li – K; Ch = S, Se),2–4 Tl 2 [TeS 3 ]5 and Ba[TeS 3 ]6 were synthesized and characterized. This family of compounds constitutes an attractive domain of research, because of their ionic‐conductivity potential.…”

Section: Introductionmentioning

confidence: 99%

Two New Cesium Thiotellurates: Cs₂[TeS₂] and Cs₂[TeS₃]

Babo

Wolff

Schleid

2013

Zeitschrift anorg allge chemie

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Thermal decomposition of cesium azide (CsN 3 ) leaves elemental cesium behind, which was in-situ produced and used for the syntheses of the two new cesium thiotellurates Cs 2 [TeS 2 ] and Cs 2 [TeS 3 ] along with appropriate amounts of tellurium and sulfur. The first compound crystallizes orthorhombically in space group Cmc2 1 with the lattice parameters a = 783.39(4), b = 1126.72(8), c = 823.04(5) pm (Z = 4) and the second one monoclinically in space group P2 1 /n with the lattice parameters a = 997.12 (6), b = 1269.71(8), c = 1410.23(9) pm, β = 91.218(3)°(Z = 8). While ψ 1 -tetrahedral complex thiotellurate(IV) anions [TeS 3 ] 2are found as pyramids in * Prof. Dr. Th. Schleid 2875 Cs 2 [TeS 3 ], Cs 2 [TeS 2 ] comprises ψ 2 -tetrahedral thiotellurate(II) units [TeS 2 ] 2as boomerangs and both occur isolated in the corresponding structures. In each of the title compounds, the anionic part of the structures is arranged layer-like with Cs + cations sitting in between the layers. The cesium cations in the sulfur-rich compound Cs 2 [TeS 3 ] exhibit coordination numbers of seven and eight, while in the Cs 2 [TeS 2 ] these cations are surrounded by only six sulfide anions. But even the lone-pair electrons at the central Te 4+ and Te 2+ cations help to complete the Cs + coordination spheres in both cases.

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“…88 Two new members of the (Sb 2 Te 3 ) m Á (Sb 2 ) n homologous series, Sb 4 Te 3 and Sb 8 Te 9 , were reported, 89 and the crystal structure of [Sb 2 Te 2 ][AlCl 4 ], obtained from Te-Sb-SbCl 3 -NaCl-AlCl 3 melts, contains one-dimensional chains of linked [Sb 2 Te 2 ] 1 rings. 90 The semiconducting materials Li 2 TeE 3 (E ¼ S or Se), synthesised from Li, Te and E (molar ratio 2 : 1 : 3) contain layers of trigonal pyramidal [TeE 3 ] 2dianions, 91 the charge-density wave materials MTe 3 (M ¼ rare earth metal) contain [Te 2 ] À square nets which, the authors noted, propagate in a fashion incommensurate from the [MTe] 1 sub-lattice. 92…”

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Oxygen, sulfur, selenium and tellurium

Bhattacharyya¹

2006

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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As in previous years, this review will emphasise synthetic, structural and spectroscopic aspects of discrete molecular species containing Group 16 elements. Notable advances include the increasing prominence of organochalcogen-nitrogen heterocycles for materials applications and the wealth of structural motifs and forms of reactivity afforded by simple chemical transformations. Sulfur, selenium and telluriumWe begin by reviewing carbon-free rings, cages and clusters. [As 3 S 5 ][AlCl 4 ] and [As 3 Se 4 ][AlCl 4 ] are obtained by reaction of S 8 or selenium respectively with As-AsCl 3 -AlCl 3 melts at 80 1C, followed by slow cooling to 50 1C. 1 The cation structures are derived from As 3 E tetrahedra (E ¼ S or Se) with three edge-bridging selenium atoms in [As 3 Se 4 ] 1 and four edge-bridging sulfurs in [As 3 S 5 ] 1 . The geometry, phase stability and electronic properties of isolated selenium chains incorporated into nanoporous AlPO 4 -5 crystals were investigated, 2 [2,2,2-crypt-Na] 1 salts of [Tl 4 Se 8 ] 4and [Tl 2 Se 4 ] 2are generated by extracting NaTl 0.5 Se into ethylenediamine in the presence of 2,2,2-crypt and 18-crown-6, 3 and [cyclo-Te 4 ] [Ga 2 Br 7 ] 2 is available from the reaction between Te and GaBr 3 in benzene. 4 Potential energy hypersurfaces of S 7 and of [LiS 7 ] 1 were investigated by Steudel and coworkers using ab initio MO calculations at the G3X(MP2) level of theory. 5 The boatlike cyclo-S 7 conformer is less stable (by E12 kJ mol À1 ) than the chairlike form, for the fifteen [LiS 7 ] 1 complexes modelled, the calculated binding energies were À93.8 to À165.7 kJ mol À1 . The same workers have also investigated Li 1 complex formation with H 2 S, Me 2 S n (n ¼ 1-5) and isomers of S 6 . 6 The first telluradistibirane and telluradibismirane (Bbt) 2 E 2 Te (E ¼ Sb or Bi), containing E 2 Te rings, were obtained by treating (Bbt)EQE(Bbt) with n Bu 3 PTe at room temperature. 7 The telluradistibirane is stable in solution up to 140 1C, whereas the bismuth analogue eliminates (Bbt)BiQBi(Bbt) and (Bbt) 2 Te 2 at 100 1C. The S-S bond order in [S 2 I 4 ] 21 , judged by crystallography, vibrational spectroscopy and normal co-ordinate analysis to be 2.2-2.4, is among the highest values determined for heavier maingroup elements in an isolated compound. 8 Passmore and Laitinen have applied MP2, B3PW91 and PBE0 methods to predict structural and spectroscopic parameters for [SeX 3 ] 1 and SeX 2 (X ¼ Cl, Br or I), 9 finding close agreement with experimental data, while the mixed-valence bromoselenate [Et 4 N] 2 [Se 3 Br 8 (Se 2 Br 2 )] is accessible from the reaction between selenium and Br 2 in acetonitrile, in the presence GDC,

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Li₂TeS₃ and Li₂TeSe₃: Preparation, Crystal Structure and Impedance Spectroscopic Characterization

Cited by 9 publications

References 25 publications

Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Two New Cesium Thiotellurates: Cs₂[TeS₂] and Cs₂[TeS₃]

Oxygen, sulfur, selenium and tellurium

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Li2TeS3 and Li2TeSe3: Preparation, Crystal Structure and Impedance Spectroscopic Characterization

Cited by 9 publications

References 25 publications

Na2TeS3, Na2TeSe3-mP24, and Na2TeSe3-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Na2TeS3, Na2TeSe3-mP24, and Na2TeSe3-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Two New Cesium Thiotellurates: Cs2[TeS2] and Cs2[TeS3]

Oxygen, sulfur, selenium and tellurium

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Li₂TeS₃ and Li₂TeSe₃: Preparation, Crystal Structure and Impedance Spectroscopic Characterization

Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Na₂TeS₃, Na₂TeSe₃-mP24, and Na₂TeSe₃-mC48: Crystal Structures and Optical and Electrical Properties of Sodium Chalcogenidotellurates(IV)

Two New Cesium Thiotellurates: Cs₂[TeS₂] and Cs₂[TeS₃]