metal-organic compounds
Bis(tetraphenylphosphonium) tetrasulfidotungstate(VI)
aDepartment of Chemistry, Heriot–Watt University, Edinburgh EH14 4AS, Scotland
*Correspondence e-mail: chepv@hw.ac.uk
The 24H20P)2[WS4], which was prepared under hydrothermal conditions, contains tetraphenylphosphonium cations linked by supramolecular interactions into chains running along the [110] and [10] directions. The [WS4]2−anions, which lie on twofold axes, are located in the cavities created between the cation chains.
of the title compound, (CRelated literature
Isostructural compounds include [Ph4P]2[MoSe4] and [Ph4P]2[WSe4] (O'Neal & Kolis, 1988), [Ph4P]2[NiCl4] (Ruhlandt-Senge & Müller, 1990), and [Ph4P]2[CdBr4] and [Ph4P]2[HgBr4] (Hasselgren et al., 1997). The related compounds [NH4]2[WS4] and [Ph4P][W(HS)S3] were reported by Sasvári (1963) and Parvez et al. (1997), respectively. For a review on thiometalates, see Müller et al. (1981). Supramolecular interactions between tetraphenylphosphonium cations have been discussed by Dance & Scudder (1995, 1996).
Experimental
Crystal data
|
Refinement
|
Data collection: APEX2 (Bruker, 2005); cell APEX2; data reduction: APEX2; program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: ATOMS (Dowty, 2000); software used to prepare material for publication: CRYSTALS.
Supporting information
10.1107/S1600536808007472/cs2070sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536808007472/cs2070Isup2.hkl
A mixture of [NH4]2[WS4] (0.348 g; 1 mmol) and [Ph4P]Br (0.21 g; 0.5 mmol) was loaded into a 23 ml Teflon-lined stainless autoclave, 2 ml of deionized water and 2 ml of ethylenediamine were added to the mixture. After stirring the mixture, the container was closed, heated at 443 K for 4 days, and cooled to room temperature at a cooling rate of 1 K min-1. The product was filtered, washed with deionized water, methanol and acetone and dried in air at room temperature. The product consists of large number of yellow crystals of the title compound (approximately 80% yield).
Data collection: APEX2 (Bruker, 2005); cell
APEX2 (Bruker, 2005); data reduction: APEX2 (Bruker, 2005); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: ATOMS (Dowty, 2000); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003).(C24H20P)2[WS4] | F(000) = 1984 |
Mr = 990.86 | Dx = 1.505 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
a = 11.1069 (4) Å | Cell parameters from 6646 reflections |
b = 19.4557 (6) Å | θ = 2.0–30.5° |
c = 20.2373 (6) Å | µ = 2.94 mm−1 |
β = 91.242 (2)° | T = 293 K |
V = 4372.1 (2) Å3 | Block, yellow |
Z = 4 | 0.40 × 0.30 × 0.30 mm |
Bruker–Nonius APEXII CCD area-detector diffractometer | 4008 reflections with I > 3σ(I) |
Graphite monochromator | Rint = 0.044 |
ω/2θ scans | θmax = 30.5°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −15→15 |
Tmin = 0.351, Tmax = 0.414 | k = −27→26 |
26702 measured reflections | l = −28→28 |
6646 independent reflections |
Refinement on F | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.027 | H-atom parameters constrained |
wR(F2) = 0.031 | Method, part 1, Chebychev polynomial, [weight] = 1.0/[A0*T0(x) + A1*T1(x) ··· + An-1]*Tn-1(x)] where Ai are the Chebychev coefficients listed below and x = F /Fmax Method = Robust Weighting W = [weight] * [1-(deltaF/6*sigmaF)2]2 Ai are: 2.09 -0.539 1.80 |
S = 1.11 | (Δ/σ)max = 0.003 |
4008 reflections | Δρmax = 1.47 e Å−3 |
249 parameters | Δρmin = −0.63 e Å−3 |
0 restraints |
(C24H20P)2[WS4] | V = 4372.1 (2) Å3 |
Mr = 990.86 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 11.1069 (4) Å | µ = 2.94 mm−1 |
b = 19.4557 (6) Å | T = 293 K |
c = 20.2373 (6) Å | 0.40 × 0.30 × 0.30 mm |
β = 91.242 (2)° |
Bruker–Nonius APEXII CCD area-detector diffractometer | 6646 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 4008 reflections with I > 3σ(I) |
Tmin = 0.351, Tmax = 0.414 | Rint = 0.044 |
26702 measured reflections |
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.031 | H-atom parameters constrained |
S = 1.11 | Δρmax = 1.47 e Å−3 |
4008 reflections | Δρmin = −0.63 e Å−3 |
249 parameters |
x | y | z | Uiso*/Ueq | ||
W1 | 0.0000 | 0.543792 (10) | 0.7500 | 0.0336 | |
S2 | 0.10243 (10) | 0.60787 (6) | 0.82067 (6) | 0.0600 | |
S3 | 0.12468 (8) | 0.47920 (5) | 0.69500 (5) | 0.0484 | |
P4 | 0.40710 (8) | 0.63367 (4) | 0.57674 (4) | 0.0388 | |
C5 | 0.3781 (3) | 0.70067 (18) | 0.63526 (17) | 0.0437 | |
C6 | 0.3089 (5) | 0.6844 (2) | 0.6898 (2) | 0.0563 | |
C7 | 0.2841 (6) | 0.7352 (3) | 0.7362 (2) | 0.0707 | |
C8 | 0.3290 (5) | 0.8004 (2) | 0.7288 (2) | 0.0686 | |
C9 | 0.3984 (5) | 0.8169 (2) | 0.6756 (3) | 0.0689 | |
C10 | 0.4229 (4) | 0.7669 (2) | 0.6283 (2) | 0.0573 | |
C11 | 0.5148 (4) | 0.66260 (19) | 0.5171 (2) | 0.0487 | |
C12 | 0.4796 (5) | 0.7113 (2) | 0.4705 (2) | 0.0628 | |
C13 | 0.5591 (6) | 0.7353 (3) | 0.4247 (3) | 0.0736 | |
C14 | 0.6755 (6) | 0.7104 (3) | 0.4251 (2) | 0.0784 | |
C15 | 0.7125 (4) | 0.6610 (3) | 0.4694 (3) | 0.0736 | |
C16 | 0.6318 (4) | 0.6367 (3) | 0.5169 (2) | 0.0587 | |
C17 | 0.4672 (3) | 0.56172 (17) | 0.62141 (17) | 0.0385 | |
C18 | 0.5678 (4) | 0.5713 (2) | 0.6630 (2) | 0.0510 | |
C19 | 0.6220 (4) | 0.5167 (3) | 0.6945 (2) | 0.0565 | |
C20 | 0.5746 (4) | 0.4515 (3) | 0.68513 (19) | 0.0595 | |
C21 | 0.4726 (4) | 0.44106 (19) | 0.6465 (2) | 0.0550 | |
C22 | 0.4181 (3) | 0.49626 (19) | 0.61360 (18) | 0.0445 | |
C23 | 0.2728 (3) | 0.60850 (18) | 0.53184 (17) | 0.0396 | |
C24 | 0.2857 (4) | 0.5749 (2) | 0.4718 (2) | 0.0528 | |
C25 | 0.1833 (4) | 0.5528 (2) | 0.43687 (19) | 0.0583 | |
C26 | 0.0705 (4) | 0.5641 (2) | 0.4617 (2) | 0.0538 | |
C27 | 0.0588 (4) | 0.5965 (2) | 0.5217 (2) | 0.0542 | |
C28 | 0.1588 (3) | 0.6183 (2) | 0.55694 (18) | 0.0471 | |
H61 | 0.2773 | 0.6368 | 0.6957 | 0.0679* | |
H71 | 0.2337 | 0.7241 | 0.7750 | 0.0853* | |
H81 | 0.3108 | 0.8363 | 0.7624 | 0.0823* | |
H91 | 0.4312 | 0.8644 | 0.6708 | 0.0827* | |
H101 | 0.4725 | 0.7788 | 0.5893 | 0.0687* | |
H121 | 0.3955 | 0.7294 | 0.4702 | 0.0758* | |
H131 | 0.5329 | 0.7706 | 0.3915 | 0.0887* | |
H141 | 0.7338 | 0.7287 | 0.3926 | 0.0950* | |
H151 | 0.7961 | 0.6423 | 0.4681 | 0.0883* | |
H161 | 0.6583 | 0.6014 | 0.5500 | 0.0706* | |
H181 | 0.6007 | 0.6186 | 0.6700 | 0.0612* | |
H191 | 0.6946 | 0.5237 | 0.7237 | 0.0677* | |
H201 | 0.6152 | 0.4114 | 0.7068 | 0.0719* | |
H211 | 0.4376 | 0.3940 | 0.6421 | 0.0663* | |
H221 | 0.3450 | 0.4889 | 0.5848 | 0.0533* | |
H241 | 0.3675 | 0.5666 | 0.4538 | 0.0636* | |
H251 | 0.1918 | 0.5287 | 0.3936 | 0.0699* | |
H261 | −0.0027 | 0.5489 | 0.4362 | 0.0647* | |
H271 | −0.0231 | 0.6043 | 0.5398 | 0.0652* | |
H281 | 0.1494 | 0.6412 | 0.6007 | 0.0565* |
U11 | U22 | U33 | U12 | U13 | U23 | |
W1 | 0.03259 (9) | 0.03114 (9) | 0.03738 (10) | 0.0000 | 0.00442 (6) | 0.0000 |
S2 | 0.0597 (6) | 0.0606 (6) | 0.0602 (6) | −0.0175 (5) | 0.0126 (5) | −0.0253 (5) |
S3 | 0.0416 (4) | 0.0516 (5) | 0.0522 (5) | 0.0069 (3) | 0.0016 (4) | −0.0151 (4) |
P4 | 0.0428 (4) | 0.0362 (4) | 0.0375 (4) | −0.0004 (3) | 0.0005 (3) | 0.0010 (3) |
C5 | 0.0527 (19) | 0.0390 (17) | 0.0391 (17) | −0.0021 (14) | −0.0030 (14) | −0.0012 (13) |
C6 | 0.080 (3) | 0.0410 (19) | 0.048 (2) | −0.0067 (18) | 0.0104 (19) | −0.0017 (16) |
C7 | 0.106 (4) | 0.059 (3) | 0.047 (2) | −0.010 (3) | 0.015 (2) | −0.0086 (19) |
C8 | 0.104 (4) | 0.048 (2) | 0.054 (2) | 0.010 (2) | −0.006 (2) | −0.0130 (19) |
C9 | 0.097 (4) | 0.039 (2) | 0.070 (3) | −0.008 (2) | −0.011 (3) | −0.0022 (19) |
C10 | 0.073 (3) | 0.043 (2) | 0.056 (2) | −0.0090 (18) | 0.0019 (19) | −0.0008 (17) |
C11 | 0.056 (2) | 0.0402 (17) | 0.050 (2) | −0.0044 (15) | 0.0076 (16) | −0.0003 (15) |
C12 | 0.082 (3) | 0.049 (2) | 0.058 (2) | 0.004 (2) | 0.016 (2) | 0.0115 (19) |
C13 | 0.107 (4) | 0.051 (2) | 0.064 (3) | −0.009 (3) | 0.021 (3) | 0.009 (2) |
C14 | 0.094 (4) | 0.086 (4) | 0.057 (3) | −0.044 (3) | 0.024 (3) | −0.005 (3) |
C15 | 0.051 (2) | 0.100 (4) | 0.070 (3) | −0.016 (2) | 0.011 (2) | −0.004 (3) |
C16 | 0.052 (2) | 0.069 (3) | 0.055 (2) | −0.0096 (19) | 0.0031 (18) | 0.000 (2) |
C17 | 0.0371 (15) | 0.0405 (17) | 0.0380 (15) | −0.0014 (12) | 0.0021 (12) | 0.0007 (12) |
C18 | 0.0441 (18) | 0.063 (2) | 0.0460 (19) | −0.0070 (17) | −0.0037 (15) | 0.0060 (17) |
C19 | 0.0375 (17) | 0.086 (3) | 0.046 (2) | 0.0089 (18) | −0.0010 (15) | 0.0100 (19) |
C20 | 0.064 (2) | 0.070 (3) | 0.0445 (18) | 0.030 (2) | 0.0064 (16) | 0.014 (2) |
C21 | 0.073 (3) | 0.041 (2) | 0.051 (2) | 0.0101 (17) | 0.0088 (18) | −0.0020 (15) |
C22 | 0.0474 (18) | 0.0428 (18) | 0.0432 (18) | 0.0004 (14) | −0.0007 (14) | 0.0007 (14) |
C23 | 0.0432 (17) | 0.0389 (16) | 0.0367 (16) | 0.0049 (13) | −0.0013 (13) | 0.0034 (13) |
C24 | 0.0441 (19) | 0.067 (2) | 0.048 (2) | 0.0043 (17) | 0.0033 (15) | −0.0106 (18) |
C25 | 0.065 (2) | 0.068 (3) | 0.0409 (18) | −0.002 (2) | −0.0046 (16) | −0.0115 (18) |
C26 | 0.057 (2) | 0.061 (2) | 0.0439 (19) | −0.0073 (17) | −0.0063 (16) | 0.0061 (16) |
C27 | 0.0419 (18) | 0.067 (2) | 0.054 (2) | −0.0001 (17) | 0.0058 (16) | 0.0019 (18) |
C28 | 0.0487 (19) | 0.054 (2) | 0.0388 (17) | 0.0032 (16) | 0.0029 (14) | −0.0019 (15) |
W1—S2i | 2.1962 (10) | C14—H141 | 0.999 |
W1—S3i | 2.1915 (9) | C15—C16 | 1.409 (6) |
W1—S2 | 2.1962 (10) | C15—H151 | 0.998 |
W1—S3 | 2.1915 (9) | C16—H161 | 0.999 |
P4—C5 | 1.795 (4) | C17—C18 | 1.396 (5) |
P4—C11 | 1.807 (4) | C17—C22 | 1.393 (5) |
P4—C17 | 1.788 (3) | C18—C19 | 1.371 (6) |
P4—C23 | 1.797 (4) | C18—H181 | 0.999 |
C5—C6 | 1.395 (5) | C19—C20 | 1.384 (7) |
C5—C10 | 1.390 (5) | C19—H191 | 0.999 |
C6—C7 | 1.394 (6) | C20—C21 | 1.378 (7) |
C6—H61 | 0.998 | C20—H201 | 0.998 |
C7—C8 | 1.374 (7) | C21—C22 | 1.395 (6) |
C7—H71 | 0.997 | C21—H211 | 0.999 |
C8—C9 | 1.376 (8) | C22—H221 | 0.999 |
C8—H81 | 0.998 | C23—C24 | 1.390 (5) |
C9—C10 | 1.394 (7) | C23—C28 | 1.388 (5) |
C9—H91 | 0.999 | C24—C25 | 1.393 (6) |
C10—H101 | 0.999 | C24—H241 | 0.999 |
C11—C12 | 1.388 (6) | C25—C26 | 1.378 (6) |
C11—C16 | 1.394 (6) | C25—H251 | 1.000 |
C12—C13 | 1.375 (7) | C26—C27 | 1.377 (6) |
C12—H121 | 0.999 | C26—H261 | 0.998 |
C13—C14 | 1.380 (9) | C27—C28 | 1.374 (6) |
C13—H131 | 0.999 | C27—H271 | 0.999 |
C14—C15 | 1.371 (9) | C28—H281 | 0.999 |
S2i—W1—S3i | 109.40 (4) | C14—C15—C16 | 119.6 (5) |
S2i—W1—S2 | 110.82 (7) | C14—C15—H151 | 120.2 |
S3i—W1—S2 | 108.59 (4) | C16—C15—H151 | 120.2 |
S2i—W1—S3 | 108.59 (4) | C15—C16—C11 | 119.2 (4) |
S3i—W1—S3 | 110.02 (6) | C15—C16—H161 | 120.4 |
S2—W1—S3 | 109.40 (4) | C11—C16—H161 | 120.4 |
C5—P4—C11 | 110.19 (17) | P4—C17—C18 | 119.1 (3) |
C5—P4—C17 | 107.77 (16) | P4—C17—C22 | 121.2 (3) |
C11—P4—C17 | 109.65 (17) | C18—C17—C22 | 119.7 (3) |
C5—P4—C23 | 111.88 (17) | C17—C18—C19 | 121.0 (4) |
C11—P4—C23 | 107.53 (18) | C17—C18—H181 | 119.6 |
C17—P4—C23 | 109.81 (16) | C19—C18—H181 | 119.5 |
P4—C5—C6 | 117.8 (3) | C18—C19—C20 | 119.0 (4) |
P4—C5—C10 | 122.5 (3) | C18—C19—H191 | 120.6 |
C6—C5—C10 | 119.7 (4) | C20—C19—H191 | 120.4 |
C5—C6—C7 | 119.5 (4) | C19—C20—C21 | 121.2 (4) |
C5—C6—H61 | 120.3 | C19—C20—H201 | 119.3 |
C7—C6—H61 | 120.2 | C21—C20—H201 | 119.5 |
C6—C7—C8 | 120.2 (4) | C20—C21—C22 | 120.0 (4) |
C6—C7—H71 | 120.0 | C20—C21—H211 | 120.0 |
C8—C7—H71 | 119.8 | C22—C21—H211 | 120.0 |
C7—C8—C9 | 120.8 (4) | C21—C22—C17 | 119.0 (4) |
C7—C8—H81 | 119.6 | C21—C22—H221 | 120.4 |
C9—C8—H81 | 119.7 | C17—C22—H221 | 120.6 |
C8—C9—C10 | 119.7 (4) | P4—C23—C24 | 118.0 (3) |
C8—C9—H91 | 120.1 | P4—C23—C28 | 122.1 (3) |
C10—C9—H91 | 120.2 | C24—C23—C28 | 119.8 (3) |
C9—C10—C5 | 120.1 (4) | C23—C24—C25 | 119.3 (4) |
C9—C10—H101 | 119.9 | C23—C24—H241 | 120.3 |
C5—C10—H101 | 120.0 | C25—C24—H241 | 120.3 |
P4—C11—C12 | 119.1 (3) | C24—C25—C26 | 120.3 (4) |
P4—C11—C16 | 121.3 (3) | C24—C25—H251 | 119.8 |
C12—C11—C16 | 119.5 (4) | C26—C25—H251 | 119.9 |
C11—C12—C13 | 121.0 (5) | C25—C26—C27 | 119.9 (4) |
C11—C12—H121 | 119.6 | C25—C26—H261 | 120.0 |
C13—C12—H121 | 119.5 | C27—C26—H261 | 120.0 |
C12—C13—C14 | 119.4 (5) | C26—C27—C28 | 120.5 (4) |
C12—C13—H131 | 120.3 | C26—C27—H271 | 119.7 |
C14—C13—H131 | 120.3 | C28—C27—H271 | 119.8 |
C13—C14—C15 | 121.2 (4) | C23—C28—C27 | 120.1 (3) |
C13—C14—H141 | 119.4 | C23—C28—H281 | 120.0 |
C15—C14—H141 | 119.4 | C27—C28—H281 | 119.9 |
Symmetry code: (i) −x, y, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | (C24H20P)2[WS4] |
Mr | 990.86 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 293 |
a, b, c (Å) | 11.1069 (4), 19.4557 (6), 20.2373 (6) |
β (°) | 91.242 (2) |
V (Å3) | 4372.1 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.94 |
Crystal size (mm) | 0.40 × 0.30 × 0.30 |
Data collection | |
Diffractometer | Bruker–Nonius APEXII CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.351, 0.414 |
No. of measured, independent and observed [I > 3σ(I)] reflections | 26702, 6646, 4008 |
Rint | 0.044 |
(sin θ/λ)max (Å−1) | 0.714 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.031, 1.11 |
No. of reflections | 4008 |
No. of parameters | 249 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.47, −0.63 |
Computer programs: APEX2 (Bruker, 2005), SIR92 (Altomare et al., 1994), CRYSTALS (Betteridge et al., 2003), ATOMS (Dowty, 2000).
W1—S2i | 2.1962 (10) | W1—S2 | 2.1962 (10) |
W1—S3i | 2.1915 (9) | W1—S3 | 2.1915 (9) |
S2i—W1—S3i | 109.40 (4) | S2i—W1—S3 | 108.59 (4) |
S2i—W1—S2 | 110.82 (7) | S3i—W1—S3 | 110.02 (6) |
S3i—W1—S2 | 108.59 (4) | S2—W1—S3 | 109.40 (4) |
Symmetry code: (i) −x, y, −z+3/2. |
Acknowledgements
The authors thank ScotCHEM for a studentship for PLB and the UK EPSRC for an Advanced Research Fellowship for PV.
References
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The ability of tetrathiometallates to act as multidentate ligands has resulted in a rich coordination chemistry, which includes both discrete multimetal clusters such as [A(MS4)2]2- (A = Fe, Co, Ni, Pd, Pt, Zn, Cd; M = Mo, W) and extended structures such as NH4Cu[WS4] (Müller et al., 1981). The compound reported here is the result of our ongoing research efforts on the synthesis of novel transition metal thiometallates.
The title compound, which was prepared under hydrothermal conditions, contains discrete WS42- anions and tetraphenylphosphonium [Ph4P]+ cations. The local coordination and the atom-labelling scheme are shown in Figure 1. Each tungsten atom is surrounded by four sulfur atoms in a tetrahedral coordination. The S—W—S bond angles range from 108.59 (4) to 110.82 (7) whilst the four W—S distances are nearly identical ranging from 2.1915 (9) to 2.1962 (10) Å, and are similar to those found in [NH4]2[WS4] (Sasvári, 1963).
The [Ph4P]+ cations are arranged into zigzag chains (Figure 2) in which each phenyl group points towards another phenyl group in a neighbouring cation, with the H atoms of a given ring oriented towards the π electron density of the second phenyl ring. It has been proposed that attractive interactions between the phenyl groups of [Ph4P]+cations play a major role in the crystal packing of compounds of this type (Dance & Scudder, 1995). In particular, the so-called sextuple phenyl embrace, in which three phenyl groups of a [Ph4P]+ cation face three phenyl groups of an adjacent [Ph4P]+ cation in an edge-to-face conformation, is a frequently observed supramolecular motif (Dance & Scudder, 1996). As illustrated by Figure 2, the zigzag chains of [Ph4P]+cations found in the title compound could be described by considering each [Ph4P]+cation to interact with its two neighbours through sextuple phenyl embraces. The P···P distances within the chain are ca 6.5 Å, comparable to those observed in compounds containing this type of chain (Dance & Scudder, 1996). The structure of the title compound contains zigzag [Ph4P]+ chains running along the [110] and [110] directions (Figure 3). There are relatively short P···P distances, of ca 7.3 Å, between [Ph4P]+cations from different chains, which involve two face-to-face phenyl interactions, suggesting that there may be additional interchain supramolecular interactions. This type of interaction has been reported previously (Dance & Scudder,1996), and has been termed quadruple phenyl embrace. The tetrathiotungstate anions are located in the cavities created between the cation chains (Figure 3). A number [Ph4P]+ salts, containing chemically diverse tetrahedral anions, adopt a similar crystal structure. Isostructural compounds that have been reported include selenometallates such as [Ph4P]2[MoSe4] (O'Neal & Kolis, 1988) and [Ph4P]2[WSe4] (O'Neal & Kolis, 1988), and halometalates like [Ph4P]2[NiCl4] (Ruhlandt-Senge & Müller, 1990), [Ph4P]2[CdBr4] and [Ph4P]2[HgBr4] (Hasselgren et al., 1997).