Startseite Crystal structure of bis(methylammonium) tetrathiotungstate(VI), (CH3NH3)2[WS4]
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Crystal structure of bis(methylammonium) tetrathiotungstate(VI), (CH3NH3)2[WS4]

  • Kang-Woo Kim ORCID logo EMAIL logo
Veröffentlicht/Copyright: 2. April 2025

Abstract

C2H12N2S4W, orthorhombic, Pnma (no. 62), a = 9.6317(3) Å, b = 7.0104(2) Å, c = 15.7286(6) Å, V = 1062.03(6) Å3, Z = 4, Rgt(F) = 0.0230, wRref(F2) = 0.0520, T = 223 K.

CCDC no.: 2433004

1 Source of material

(NH4)2WS4 (0.030 g, 0.086 mmol) and MeNH3Cl (0.069 g, 1.0 mmol) were charged to a Pyrex tube with diameter of 9 mm and about 0.5 mL MeOH was added as a solvent. While the solvent was being frozen, the Pyrex tube was evacuated and sealed with a flame. The sealed tube was placed in an oven and heated at 110 °C for 3 days, then cooled to room temperature. Light yellow needle crystals were isolated by filtration and washed with MeOH and diethyl ether several times. Crystals of (MeNH3)2[WS4] were obtained in 9 % yield, based on the W metal used (Table 1).

Table 1:

Data collection and handling.

Crystal: Yellow needle
Size: 0.14 × 0.13 × 0.09 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 11.6 mm−1
Diffractometer, scan mode: Bruker APEX-II, φ and ω scans
θmax, completeness: 28.3°, 100 %
N(hkl)measured, N(hkl)unique, Rint: 8592, 1417, 0.036
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 1,228
N(param)refined: 57
Programs: Bruker, 1 SHELX 2 , WinGX 3 , DIAMOND 4

2 Experimental details

H atoms were positioned geometrically and treated as riding, with C–H = 0.97 Å with Uiso(H) = 1.5 Ueq(C) and N–H = 0.90 Å with Uiso(H) = 1.5 Ueq(N).

3 Comment

The title compound, (CH3NH3)2[WS4] was prepared by the methanothermal reaction of (NH4)2WS4 and CH3NH3Cl, and it consists of a [WS4]2− anion and two charge-balancing CH3NH3+ cations. As one of the most extensively studied and structurally characterized thiometallate anions, the tetrathiotungstate [WS4]2− anion has been stabilized with numerous cations including NH4+, 5 , 6 Rb+, 7 [Ni(tren)2]2+ (tren = tris(2-aminoethyl)amine) 8 and various organic cations. Organic cations employed for the stabilization of the [WS4]2− anion include Ph4P+, 9 tetraalkylammonium (Me4N+, Et4N+, Pr4N+), 10 alkylammonium with N–H bonds (H3NCH2CH2NH32+, i-PrNH3+, etc.), 11 , 12 , 13 , 14 , 15 and mixed tetraalkylammonium (BuMe3N+, BenzylMe3N+). 16 , 17 As the smallest organic cation and a member of the alkylammonium family with N–H bonds, CH3NH3+ methylammonium ion is also demonstrated to be adequate for the stabilization of the [WS4]2− anion.

In the structure of (CH3NH3)2[WS4], there is one half of a crystallographically independent [WS4]2− anion, in which the W(1), S(1) and S(2) atoms lie on the mirror plane. The tetrahedral coordination geometry around the W(1) atom is nearly ideal, with S–W–S bond angles between 107.86(4)° and 110.61(6)°. The W–S bond distances range from 2.185(2) Å to 2.197(1) Å. Compared to the other [WS4]2− compounds, (CH3NH3)2[WS4] exhibits a relatively small Δ value, 0.012 Å for the difference between the longest and the shortest W–S bond distances. The shortest S…H contacts occur between S(3) and H(1NB) with 2.453(1) Å, and between S(2) and H(1NA) with 2.454(2) Å, respectively. There are three additional S…H contacts less than 2.80 Å in the pairs of S(3)…H(2NA), S(1)…H(1NC), and S(2)…H(1NB). In both crystallographically independent CH3NH3+ cations, C and N atoms lie on the mirror plane resulting in an occupancy of 0.5 for all H atoms. Based on the short S…H contacts, it is evident that both CH3NH3+ cations are positioned with –NH3 side, instead of –CH3 side, heading toward [WS4]2− anion. The orientation of the CH3NH3+ cations relative to the [WS4]2− anion can be attributed to the positive charge on N atoms and better H-bonding between N and S atoms.


Corresponding author: Kang-Woo Kim, Department of Chemistry & Research Institute for Natural Sciences, Incheon National University, Incheon 22012, Korea, E-mail:

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Received: 2025-02-11
Accepted: 2025-03-21
Published Online: 2025-04-02
Published in Print: 2025-06-26

© 2025 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

Artikel in diesem Heft

  1. Frontmatter
  2. New Crystal Structures
  3. Crystal structure of 5,5′-bis(2,4,6-trinitrophenyl)-2,2′-bi(1,3,4-oxadiazole), C16H4N10O14
  4. Crystal structure of catena-poly[(μ3-4,4′-oxydibenzoato- κ5 O,O: O,O:O)-bis(2,4,6-tri(3-pyridine)-1,3,5-triazine-κ1 N)cadmium(II)], C50H32CdN12O5
  5. The crystal structure of 1,4-diazepane-1,4-diium potassium trinitrate, C5H14KN5O9
  6. The crystal structure of benzyl 2,2,5,5-tetramethylthiazolidine-4-carboxylate, C15H21NO2S
  7. Crystal structure of 2-hydroxyethyl-triphenylphosphonium tetracyanidoborate, C24H20BN4OP
  8. The crystal structure of 1-methyl-3-(N-methylnitrous amide–N-methylene) imidazolidine-2,4,5-trione
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  10. Crystal structure of 5-(2,2-difluoropropyl)-5-methylbenzo[4,5]imidazo[2,1-a] isoquinolin-6(5H)-one, C20H18F2N2O
  11. The crystal structure of N′,N″-[1,2-bis(4-chlorophenyl)ethane-1,2-diylidene]bis(furan-2- carbohydrazide), C24H16Cl2N4O4
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  17. Crystal structure of (Z)-2-hydroxy-N′-(1-(o-tolyl)ethylidene)benzohydrazide, C16H16N2O2
  18. The crystal structure of 10-(1-bromoethyl)-14-(bromomethyl)dibenzo[a, c]acridine, C24H17NBr2
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  20. Synthesis and crystal structure of ethyl 4-((4-trifluoromethylbenzyl)amino)benzo, C17H16F3NO2
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  22. The crystal structure of (R)-2-aminobutanamide hydrochloride, C4H11ClN2O
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  33. Crystal structure of (E)-6-(4-methylpiperazin-1-yl)-2-(4-(trifluoromethyl)benzylidene)-3, 4-dihydronaphthalen-1(2H)-one, C23H23F3N2O
  34. Crystal structure of (E)-6-morpholino-2-(4-(trifluoromethyl)benzylidene)-3,4-dihydronaphthalen-1(2H)-one, C22H20F3NO2
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  37. Crystal structure of (4-(4-isopropylphenyl)-1H-pyrrol-3-yl)(ferrocenyl)methanone, C24H23FeNO
  38. Crystal structure of bis(methylammonium) tetrathiotungstate(VI), (CH3NH3)2[WS4]
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  41. Crystal structure of N-isopropyl-1,8-naphthalimide C15H13NO2
  42. TiNiSi-type EuPdBi
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  44. The crystal structure of 3-(3-carboxypropyl)-2-nitro-1H-pyrrole 1-oxide, C7H9N3O5
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