metal-organic compounds
Poly[[μ3-chlorido-bis(μ2-thiourea-κS)disilver(I)] nitrate]
aDepartment of Chemistry, University of Engineering and Technology, Lahore 54890, Pakistan, and bInstitute of Physics, University of Neuchâtel, rue Emile-Argand 11, CH-2009 Neuchâtel, Switzerland
*Correspondence e-mail: saeed_a786@hotmail.com, muhammad.altaf@unine.ch
The molecular structure of the title polymeric complex, {[Ag2Cl(CH4N2S)2]NO3}n, consists of a binuclear cationic complex and a nitrate counter-ion. The cationic complex contains two bridging thiourea (Tu) ligands and a triply bridging μ3-Cl anion. The latter is probably released from 2-aminoethanethiol hydrochloride during the synthesis. The coordination environment around the two AgI atoms is different; one is trigonal planar, being coordinated by two thiourea ligands through the S atoms and to one Cl− ion, while in the other the AgI atom is tetrahedrally coordinated by two thiourea ligands through the S atoms and to two Cl− ions. These units aggregate through the Cl− anion and the Tu S atoms, forming a chain propagating in [100]. In the the polymeric chains are linked via N—H⋯O and N—H⋯Cl hydrogen bonds, forming a double layer two-dimensional network propagating in (011).
Related literature
For silver(I) complexes with sulfur-containing ligands with applications in medicine and analytical chemistry, see: Raper (1996); Akrivos (2001). For silver(I) complexes containing thiones, see: Stocker et al. (2000); Pakawatchai et al. (1996); Casas et al. (1996); Aslandis et al. (2005); Ashraf et al. (2004); Isab et al. (2002). For silver(I) complexes containing thiolates, see: Nomiya et al. (2000); Zachariadis et al. (2003); Tsyba et al. (2003). For argentophilic interactions, see: Nomiya et al. (2000); Zachariadis et al. (2003); Tsyba et al. (2003). For the structures of some silver(I) complexes of thiourea, see: Udupa et al. (1976); Hanif et al. (2007).
Experimental
Crystal data
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Refinement
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Data collection: EXPOSE (Stoe & Cie, 2004); cell CELL (Stoe & Cie, 2004); data reduction: INTEGRATE (Stoe & Cie, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2006); software used to prepare material for publication: PLATON and SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810030953/bt5309sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810030953/bt5309Isup2.hkl
The title complex was prepared by adding 1 mmol (0.113 g) of 2-aminoethanethiol hydrochloride, dissolved in 10 ml of distilled water, to 1 mmol (0.170 g) of AgNO3, dissolved in 30 ml of distilled water. The mixture was stirred for 15–20 min giving a clear solution. 1 mmol (0.076 g) of thiourea, dissolved in 10 ml of methanol, was then added and the mixture was stirred for a further 15 min. The solution was then filtered and the filtrate kept at RT for slow evaporation of the solvent. After 2–3 days colourless crystals, suitable for X-ray
were obtained.The NH2 H-atoms could be located in difference electron-density maps. In the final cycles of least-squares
they were included in calculated positions and treated as riding atoms: N—H = 0.88 Å, with Uiso(H) = 1.2Ueq(N).The study of the coordination and structural chemistry of silver(I) complexes with sulfur containing ligands has been a matter of interest over the last decades due to their wide range of applications in medicine and in analytical chemistry (Raper, 1996; Akrivos, 2001), and also due to their ability to adopt geometries with variable nuclearities and structural diversity. Consequently, several silver(I) complexes containing thiones (Stocker et al., 2000; Pakawatchai et al., 1996; Casas et al., 1996; Aslandis et al., 2005; Ashraf et al., 2004; Isab et al., 2002) and
(Nomiya et al., 2000; Zachariadis et al., 2003; Tsyba et al., 2003) have been prepared and structurally characterized. Silver(I) complexes with like thiomalic acid, thiosalisalic acid and 2-mercaptonicotinic acid [Nomiya et al., 2000; Zachariadis et al., 2003] also have remarkable antimicrobial activities for bacteria, yeast, and mold. The present report describes the structure of the new title silver(I) cluster of thiourea (Tu).The molecular structure of the title complex is shown in Fig. 1. The
consists of a binuclear cationic complex and a nitrate counter ion. The cationic complex contains two silver(I) atoms, Ag1 and Ag2, two Tu ligands which bridge the silver(I) atoms via the S-atoms, and a triply bridging (µ3)Cl- anion. The latter is probably released from 2-aminoethanethiol hydrochloride during the synthesis. The coordination environments around the two silver atoms are different. Atom Ag1 possesses a tetrahedral geometry, being coordinated to two thiourea ligands through the S-atoms, and two Cl- anions. Atom Ag2 has a trigonal planar geometry, being coordinated to two thiourea ligands through S-atoms and to one Cl- anion. These units aggregate through the Cl- anion, and the Tu sulfur atoms, to form a one-dimensional chain which propagates in [100], as shown in Fig. 1.The Ag—S distances around the trigonally coordinated Ag2 center [Ag2—S1 = 2.4827 (15) Å, Ag2—S2 = 2.4913 (16) Å] are somewhat longer than those around tetrahedrally coordinated Ag1 center [Ag1—S1 = 2.4305 (15) Å, Ag1—S2 = 2.4278 (15) Å]. In contrast the Ag—Cl bond distances are lengthened. The Ag1—Cl1 and Ag1—Cl1c [symmetry code: (c) 1 - x, 2 - y, 1 - z] distances are 2.8393 (15) and 2.9280 (16) Å, respectively, compared to distance Ag2—Cl1 which is 2.5477 (14) Å. The individual distances and angles within the Tu ligand are comparable to those reported for other Ag-thiourea complexes [Udupa et al., 1976; Hanif et al., 2007].
The shortest silver(I)···silver(I) distance of 3.2889 (8) Å [Ag1—Ag2a; symmetry code: (a) -1 + x, y, z] indicates that the complex is stabilized by significant argentophilic interactions. This distance is comparable to values reported previously [Nomiya et al., 2000; Zachariadis et al., 2003; Tsyba et al., 2003]. The other short Ag···Ag distances include Ag2···Ag2d and Ag1···Ag2d of 3.5169 (8) and 3.5753 (8) Å, respectively [symmetry code: (d) 2 - x, 2 - y, -z], see Fig. 1.
In the crystal the polymeric chains are linked via N—H···O hydrogen bonds, involving the thiourea NH2 H-atoms and the nitrate O-atoms, and N—H···Cl contacts (Fig. 2, Table 1), to form a double layer two-dimensional network propagating in plane (011).
For silver(I) complexes with sulfur-containing ligands with applications in medicine and analytical chemistry, see: Raper (1996); Akrivos (2001). For silver(I) complexes containing thiones, see: Stocker et al. (2000); Pakawatchai et al. (1996); Casas et al. (1996); Aslandis et al. (2005); Ashraf et al. (2004); Isab et al. (2002). For silver(I) complexes containing
see: Nomiya et al. (2000); Zachariadis et al. (2003); Tsyba et al. (2003). For argentophilic interactions, see: Nomiya et al. (2000); Zachariadis et al. (2003); Tsyba et al. (2003). For the structures of some silver(I) complexes of thiourea, see: Udupa et al. (1976); Hanif et al. (2007).Data collection: EXPOSE (Stoe & Cie, 2004); cell
CELL (Stoe & Cie, 2004); data reduction: INTEGRATE (Stoe & Cie, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2006); software used to prepare material for publication: PLATON (Spek, 2009) and SHELXL97 (Sheldrick, 2008).Fig. 1. A view of the molecular structure of the title complex with displacement ellipoids drawn at the 50% proability level [Symmetry codes: (a) = -1 + x, y, z; (b) = 1 + x, y, z; (c) = 1 - x, 2 - y, 1 - z; (d) = 2 - x, 2 - y, -z]. | |
Fig. 2. A view along the a-axis of the crystal packing of the title complex showing the N—H···O and N—H···Cl hydrogen bonds [dotted lines; see Table 1 for details]. |
[Ag2Cl(CH4N2S)2]NO3 | Z = 2 |
Mr = 465.44 | F(000) = 444 |
Triclinic, P1 | Dx = 2.747 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 6.3981 (8) Å | Cell parameters from 5310 reflections |
b = 7.7060 (9) Å | θ = 2.7–26.0° |
c = 11.8478 (14) Å | µ = 4.08 mm−1 |
α = 83.041 (14)° | T = 173 K |
β = 82.868 (14)° | Plate, colourless |
γ = 77.312 (14)° | 0.34 × 0.23 × 0.12 mm |
V = 562.80 (12) Å3 |
Stoe IPDS diffractometer | 2055 independent reflections |
Radiation source: fine-focus sealed tube | 1682 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.056 |
φ scans | θmax = 26.0°, θmin = 2.7° |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | h = −7→7 |
Tmin = 0.771, Tmax = 1.353 | k = −9→8 |
4473 measured reflections | l = −14→13 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.114 | H-atom parameters constrained |
S = 0.98 | w = 1/[σ2(Fo2) + (0.0795P)2] where P = (Fo2 + 2Fc2)/3 |
2055 reflections | (Δ/σ)max < 0.001 |
136 parameters | Δρmax = 1.49 e Å−3 |
0 restraints | Δρmin = −1.27 e Å−3 |
[Ag2Cl(CH4N2S)2]NO3 | γ = 77.312 (14)° |
Mr = 465.44 | V = 562.80 (12) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.3981 (8) Å | Mo Kα radiation |
b = 7.7060 (9) Å | µ = 4.08 mm−1 |
c = 11.8478 (14) Å | T = 173 K |
α = 83.041 (14)° | 0.34 × 0.23 × 0.12 mm |
β = 82.868 (14)° |
Stoe IPDS diffractometer | 2055 independent reflections |
Absorption correction: multi-scan (MULscanABS in PLATON; Spek, 2009) | 1682 reflections with I > 2σ(I) |
Tmin = 0.771, Tmax = 1.353 | Rint = 0.056 |
4473 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.114 | H-atom parameters constrained |
S = 0.98 | Δρmax = 1.49 e Å−3 |
2055 reflections | Δρmin = −1.27 e Å−3 |
136 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. The NH2H-atoms were included in calculated positions and treated as riding atoms: N—H 0.88 Å with Uiso(H) = 1.2Ueq(parent N-atom). |
x | y | z | Uiso*/Ueq | ||
Ag1 | 0.48799 (7) | 0.87109 (6) | 0.15613 (4) | 0.0303 (2) | |
Ag2 | 1.07497 (7) | 1.16730 (7) | 0.06513 (4) | 0.0327 (2) | |
Cl1 | 0.6808 (2) | 1.16001 (19) | 0.05756 (13) | 0.0245 (4) | |
S1 | 0.7764 (2) | 0.63258 (18) | 0.08944 (12) | 0.0197 (4) | |
S2 | 0.2032 (2) | 1.07487 (18) | 0.25782 (13) | 0.0201 (4) | |
N1 | 1.1617 (8) | 0.5710 (7) | 0.1682 (5) | 0.0264 (16) | |
N2 | 0.8858 (7) | 0.5149 (7) | 0.2959 (5) | 0.0271 (16) | |
N3 | 0.0979 (8) | 0.8245 (7) | 0.4138 (5) | 0.0319 (16) | |
N4 | −0.1790 (8) | 0.9882 (7) | 0.3218 (5) | 0.0276 (16) | |
C1 | 0.9560 (8) | 0.5703 (7) | 0.1930 (5) | 0.0179 (14) | |
C2 | 0.0266 (8) | 0.9512 (7) | 0.3359 (5) | 0.0183 (17) | |
O1 | 0.1853 (6) | 0.3896 (6) | 0.4594 (4) | 0.0303 (15) | |
O2 | 0.4735 (7) | 0.2157 (7) | 0.5106 (5) | 0.0440 (16) | |
O3 | 0.4800 (8) | 0.3913 (8) | 0.3521 (5) | 0.0481 (18) | |
N5 | 0.3826 (7) | 0.3331 (7) | 0.4412 (5) | 0.0268 (16) | |
H1A | 1.25110 | 0.53410 | 0.22110 | 0.0320* | |
H1B | 1.21010 | 0.60840 | 0.09880 | 0.0320* | |
H2A | 0.97600 | 0.47810 | 0.34840 | 0.0330* | |
H2B | 0.74820 | 0.51410 | 0.31310 | 0.0330* | |
H3A | 0.00830 | 0.76530 | 0.45590 | 0.0380* | |
H3B | 0.23560 | 0.79830 | 0.42420 | 0.0380* | |
H4A | −0.26680 | 0.92790 | 0.36460 | 0.0330* | |
H4B | −0.22930 | 1.07330 | 0.26960 | 0.0330* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ag1 | 0.0177 (3) | 0.0356 (3) | 0.0341 (3) | −0.0027 (2) | 0.0032 (2) | −0.0001 (2) |
Ag2 | 0.0266 (3) | 0.0465 (3) | 0.0235 (3) | −0.0128 (2) | −0.0058 (2) | 0.0155 (2) |
Cl1 | 0.0214 (6) | 0.0313 (7) | 0.0219 (8) | −0.0123 (5) | −0.0056 (5) | 0.0089 (6) |
S1 | 0.0155 (6) | 0.0263 (7) | 0.0163 (8) | −0.0040 (5) | −0.0036 (5) | 0.0038 (6) |
S2 | 0.0160 (6) | 0.0234 (7) | 0.0198 (8) | −0.0062 (5) | −0.0013 (5) | 0.0057 (6) |
N1 | 0.024 (2) | 0.036 (3) | 0.019 (3) | −0.010 (2) | −0.0043 (19) | 0.007 (2) |
N2 | 0.014 (2) | 0.043 (3) | 0.022 (3) | −0.007 (2) | −0.0018 (19) | 0.008 (2) |
N3 | 0.019 (2) | 0.042 (3) | 0.029 (3) | −0.005 (2) | −0.005 (2) | 0.019 (3) |
N4 | 0.018 (2) | 0.041 (3) | 0.022 (3) | −0.011 (2) | −0.0029 (19) | 0.014 (2) |
C1 | 0.018 (2) | 0.016 (2) | 0.019 (3) | −0.0056 (19) | −0.002 (2) | 0.005 (2) |
C2 | 0.019 (3) | 0.022 (3) | 0.012 (3) | −0.001 (2) | −0.001 (2) | −0.001 (2) |
O1 | 0.0158 (18) | 0.044 (3) | 0.024 (3) | 0.0012 (17) | −0.0020 (16) | 0.011 (2) |
O2 | 0.022 (2) | 0.056 (3) | 0.047 (3) | −0.001 (2) | −0.013 (2) | 0.019 (3) |
O3 | 0.028 (2) | 0.071 (4) | 0.041 (3) | −0.020 (2) | 0.010 (2) | 0.016 (3) |
N5 | 0.016 (2) | 0.035 (3) | 0.028 (3) | −0.008 (2) | −0.002 (2) | 0.007 (2) |
Ag1—Cl1 | 2.8393 (15) | N1—C1 | 1.314 (8) |
Ag1—S1 | 2.4305 (15) | N2—C1 | 1.301 (8) |
Ag1—S2 | 2.4278 (15) | N3—C2 | 1.305 (8) |
Ag1—Cl1i | 2.9280 (16) | N4—C2 | 1.311 (8) |
Ag2—Cl1 | 2.5477 (14) | N1—H1A | 0.8800 |
Ag2—S2ii | 2.4913 (16) | N1—H1B | 0.8800 |
Ag2—S1iii | 2.4827 (15) | N2—H2B | 0.8800 |
S1—C1 | 1.738 (6) | N2—H2A | 0.8800 |
S2—C2 | 1.744 (6) | N3—H3A | 0.8800 |
O1—N5 | 1.242 (6) | N3—H3B | 0.8800 |
O2—N5 | 1.241 (8) | N4—H4A | 0.8800 |
O3—N5 | 1.244 (8) | N4—H4B | 0.8800 |
Cl1—Ag1—S1 | 96.91 (5) | C1—N1—H1A | 120.00 |
Cl1—Ag1—S2 | 90.60 (5) | C1—N2—H2A | 120.00 |
Cl1—Ag1—Cl1i | 92.64 (5) | H2A—N2—H2B | 120.00 |
S1—Ag1—S2 | 169.00 (5) | C1—N2—H2B | 120.00 |
Cl1i—Ag1—S1 | 82.74 (5) | C2—N3—H3A | 120.00 |
Cl1i—Ag1—S2 | 105.01 (5) | H3A—N3—H3B | 120.00 |
Cl1—Ag2—S2ii | 114.00 (5) | C2—N3—H3B | 120.00 |
Cl1—Ag2—S1iii | 114.55 (5) | C2—N4—H4B | 120.00 |
S1iii—Ag2—S2ii | 126.77 (5) | H4A—N4—H4B | 120.00 |
Ag1—Cl1—Ag2 | 123.99 (6) | C2—N4—H4A | 120.00 |
Ag1—Cl1—Ag1i | 87.36 (4) | O2—N5—O3 | 122.5 (5) |
Ag1i—Cl1—Ag2 | 121.83 (6) | O1—N5—O2 | 118.6 (5) |
Ag1—S1—C1 | 108.15 (19) | O1—N5—O3 | 118.8 (5) |
Ag1—S1—Ag2iii | 93.38 (5) | S1—C1—N1 | 121.4 (5) |
Ag2iii—S1—C1 | 108.74 (19) | S1—C1—N2 | 119.0 (4) |
Ag1—S2—C2 | 108.27 (19) | N1—C1—N2 | 119.6 (5) |
Ag1—S2—Ag2iv | 83.91 (5) | S2—C2—N3 | 119.6 (4) |
Ag2iv—S2—C2 | 107.4 (2) | S2—C2—N4 | 121.3 (4) |
C1—N1—H1B | 120.00 | N3—C2—N4 | 119.0 (5) |
H1A—N1—H1B | 120.00 | ||
S1—Ag1—Cl1—Ag2 | −44.29 (8) | S2—Ag1—Cl1i—Ag1i | 91.33 (5) |
S1—Ag1—Cl1—Ag1i | 83.00 (5) | S2—Ag1—Cl1i—Ag2i | −37.73 (8) |
S2—Ag1—Cl1—Ag2 | 127.66 (7) | S2ii—Ag2—Cl1—Ag1 | −46.44 (8) |
S2—Ag1—Cl1—Ag1i | −105.06 (5) | S2ii—Ag2—Cl1—Ag1i | −157.13 (6) |
Cl1i—Ag1—Cl1—Ag2 | −127.29 (7) | S1iii—Ag2—Cl1—Ag1 | 156.10 (6) |
Cl1i—Ag1—Cl1—Ag1i | −0.02 (9) | S1iii—Ag2—Cl1—Ag1i | 45.41 (8) |
Cl1—Ag1—S1—C1 | 90.6 (2) | Cl1—Ag2—S2ii—Ag1ii | 127.70 (5) |
Cl1—Ag1—S1—Ag2iii | −20.40 (5) | Cl1—Ag2—S2ii—C2ii | 20.4 (2) |
Cl1i—Ag1—S1—C1 | −177.6 (2) | Cl1—Ag2—S1iii—Ag1iii | −123.22 (5) |
Cl1i—Ag1—S1—Ag2iii | 71.40 (5) | Cl1—Ag2—S1iii—C1iii | −12.8 (2) |
Cl1—Ag1—S2—C2 | 179.2 (2) | Ag1—S1—C1—N1 | −124.7 (4) |
Cl1—Ag1—S2—Ag2iv | 72.83 (5) | Ag1—S1—C1—N2 | 58.3 (5) |
Cl1i—Ag1—S2—C2 | 86.3 (2) | Ag2iii—S1—C1—N1 | −24.5 (5) |
Cl1i—Ag1—S2—Ag2iv | −20.06 (5) | Ag2iii—S1—C1—N2 | 158.4 (4) |
Cl1—Ag1—Cl1i—Ag1i | 0.02 (10) | Ag1—S2—C2—N3 | 60.2 (5) |
Cl1—Ag1—Cl1i—Ag2i | −129.06 (7) | Ag1—S2—C2—N4 | −123.1 (5) |
S1—Ag1—Cl1i—Ag1i | −96.64 (5) | Ag2iv—S2—C2—N3 | 149.4 (4) |
S1—Ag1—Cl1i—Ag2i | 134.30 (7) | Ag2iv—S2—C2—N4 | −33.8 (5) |
Symmetry codes: (i) −x+1, −y+2, −z; (ii) x+1, y, z; (iii) −x+2, −y+2, −z; (iv) x−1, y, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O3ii | 0.88 | 2.28 | 3.153 (8) | 170 |
N2—H2A···O1ii | 0.88 | 1.95 | 2.831 (7) | 177 |
N2—H2B···O3 | 0.88 | 2.11 | 2.932 (7) | 155 |
N3—H3A···O1v | 0.88 | 2.00 | 2.881 (7) | 174 |
N3—H3B···O2vi | 0.88 | 2.08 | 2.930 (7) | 163 |
N4—H4A···O2v | 0.88 | 2.22 | 3.095 (8) | 173 |
N1—H1B···Cl1iii | 0.88 | 2.56 | 3.372 (6) | 155 |
N4—H4B···Cl1iv | 0.88 | 2.62 | 3.396 (6) | 147 |
Symmetry codes: (ii) x+1, y, z; (iii) −x+2, −y+2, −z; (iv) x−1, y, z; (v) −x, −y+1, −z+1; (vi) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Ag2Cl(CH4N2S)2]NO3 |
Mr | 465.44 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 173 |
a, b, c (Å) | 6.3981 (8), 7.7060 (9), 11.8478 (14) |
α, β, γ (°) | 83.041 (14), 82.868 (14), 77.312 (14) |
V (Å3) | 562.80 (12) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 4.08 |
Crystal size (mm) | 0.34 × 0.23 × 0.12 |
Data collection | |
Diffractometer | Stoe IPDS |
Absorption correction | Multi-scan (MULscanABS in PLATON; Spek, 2009) |
Tmin, Tmax | 0.771, 1.353 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4473, 2055, 1682 |
Rint | 0.056 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.114, 0.98 |
No. of reflections | 2055 |
No. of parameters | 136 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.49, −1.27 |
Computer programs: EXPOSE (Stoe & Cie, 2004), CELL (Stoe & Cie, 2004), INTEGRATE (Stoe & Cie, 2004), SHELXS97 (Sheldrick, 2008), PLATON (Spek, 2009) and Mercury (Macrae et al., 2006), PLATON (Spek, 2009) and SHELXL97 (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O3i | 0.88 | 2.28 | 3.153 (8) | 170 |
N2—H2A···O1i | 0.88 | 1.95 | 2.831 (7) | 177 |
N2—H2B···O3 | 0.88 | 2.11 | 2.932 (7) | 155 |
N3—H3A···O1ii | 0.88 | 2.00 | 2.881 (7) | 174 |
N3—H3B···O2iii | 0.88 | 2.08 | 2.930 (7) | 163 |
N4—H4A···O2ii | 0.88 | 2.22 | 3.095 (8) | 173 |
N1—H1B···Cl1iv | 0.88 | 2.56 | 3.372 (6) | 155 |
N4—H4B···Cl1v | 0.88 | 2.62 | 3.396 (6) | 147 |
Symmetry codes: (i) x+1, y, z; (ii) −x, −y+1, −z+1; (iii) −x+1, −y+1, −z+1; (iv) −x+2, −y+2, −z; (v) x−1, y, z. |
Acknowledgements
MA and HSE thank the staff of the X-ray Application Lab, CSEM, Neuchâtel, for access to the X-ray diffractometer.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The study of the coordination and structural chemistry of silver(I) complexes with sulfur containing ligands has been a matter of interest over the last decades due to their wide range of applications in medicine and in analytical chemistry (Raper, 1996; Akrivos, 2001), and also due to their ability to adopt geometries with variable nuclearities and structural diversity. Consequently, several silver(I) complexes containing thiones (Stocker et al., 2000; Pakawatchai et al., 1996; Casas et al., 1996; Aslandis et al., 2005; Ashraf et al., 2004; Isab et al., 2002) and thiolates (Nomiya et al., 2000; Zachariadis et al., 2003; Tsyba et al., 2003) have been prepared and structurally characterized. Silver(I) complexes with thiolates like thiomalic acid, thiosalisalic acid and 2-mercaptonicotinic acid [Nomiya et al., 2000; Zachariadis et al., 2003] also have remarkable antimicrobial activities for bacteria, yeast, and mold. The present report describes the structure of the new title silver(I) cluster of thiourea (Tu).
The molecular structure of the title complex is shown in Fig. 1. The asymmetric unit consists of a binuclear cationic complex and a nitrate counter ion. The cationic complex contains two silver(I) atoms, Ag1 and Ag2, two Tu ligands which bridge the silver(I) atoms via the S-atoms, and a triply bridging (µ3)Cl- anion. The latter is probably released from 2-aminoethanethiol hydrochloride during the synthesis. The coordination environments around the two silver atoms are different. Atom Ag1 possesses a tetrahedral geometry, being coordinated to two thiourea ligands through the S-atoms, and two Cl- anions. Atom Ag2 has a trigonal planar geometry, being coordinated to two thiourea ligands through S-atoms and to one Cl- anion. These units aggregate through the Cl- anion, and the Tu sulfur atoms, to form a one-dimensional chain which propagates in [100], as shown in Fig. 1.
The Ag—S distances around the trigonally coordinated Ag2 center [Ag2—S1 = 2.4827 (15) Å, Ag2—S2 = 2.4913 (16) Å] are somewhat longer than those around tetrahedrally coordinated Ag1 center [Ag1—S1 = 2.4305 (15) Å, Ag1—S2 = 2.4278 (15) Å]. In contrast the Ag—Cl bond distances are lengthened. The Ag1—Cl1 and Ag1—Cl1c [symmetry code: (c) 1 - x, 2 - y, 1 - z] distances are 2.8393 (15) and 2.9280 (16) Å, respectively, compared to distance Ag2—Cl1 which is 2.5477 (14) Å. The individual distances and angles within the Tu ligand are comparable to those reported for other Ag-thiourea complexes [Udupa et al., 1976; Hanif et al., 2007].
The shortest silver(I)···silver(I) distance of 3.2889 (8) Å [Ag1—Ag2a; symmetry code: (a) -1 + x, y, z] indicates that the complex is stabilized by significant argentophilic interactions. This distance is comparable to values reported previously [Nomiya et al., 2000; Zachariadis et al., 2003; Tsyba et al., 2003]. The other short Ag···Ag distances include Ag2···Ag2d and Ag1···Ag2d of 3.5169 (8) and 3.5753 (8) Å, respectively [symmetry code: (d) 2 - x, 2 - y, -z], see Fig. 1.
In the crystal the polymeric chains are linked via N—H···O hydrogen bonds, involving the thiourea NH2 H-atoms and the nitrate O-atoms, and N—H···Cl contacts (Fig. 2, Table 1), to form a double layer two-dimensional network propagating in plane (011).