Download citation
Download citation
link to html
The crystal structure of the widely used title fungicidal material, [Cu(C5H4NOS)2], has been determined at 150 (2) K from a microcrystalline fragment using synchrotron radiation. The mol­ecule adopts a trans-square-planar configuration, with the Cu atom sited at a crystallographic centre of inversion.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S0108270101012306/gd1171sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S0108270101012306/gd1171Isup2.hkl
Contains datablock I

CCDC reference: 174803

Comment top

Cyclic thiohydroxamic acids such as 1-hydroxy-2(1H)-pyridinethione (pyrithione) find extensive use as fungicides (Paulus, 1993). In particular, complexes of pyrithione with Zn and Cu are highly active broad-spectrum antimicrobial agents. Zinc pyrithione is the active ingredient in most antidandruff shampoos (Arch Chemicals, 2000a). Copper pyrithione is sold extensively (outside the USA) as a marine antifouling product; marine paints containing copper pyrithione are easy to formulate and are extremely stable even when subjected to extreme thermal conditions (Arch Chemicals, 2000b). The crystal structure of zinc pyrithione has been known for almost 25 years (Barnett et al., 1977), and a considerable number of pyrithione complexes have been prepared and their crystal structures determined (Chen et al., 1991; Hu et al., 1991; Xu et al., 1995; Wen et al., 1996). Despite this extensive research, the crystal structure of copper pyrithione has remained elusive. This may undoubtedly be attributed to the fact that copper pyrithione does not readily form large single crystals suitable for diffraction analysis with laboratory instruments. We report here the crystal structure of copper pyrithione, (I), determined from a microcrystalline fragment using the additional brightness of the Synchrotron Radiation Source at Daresbury, England (Cernik et al., 1997). \sch

Compound (I) adopts a trans square-planar arrangement, with Cu1 sited at a centre of inversion in the space group P1 (Fig. 1). The Cu1—S1 and Cu1—O1 bond distances (Table 1) are shorter than those in zinc pyrithione [average 2.308 (3) and 2.115 (6) Å, respectively] Query - 2.092 (7) Å for (I) from CIF data. Molecules of (I) are linked into chains by C—H···O interactions, forming an R22(8) hydrogen-bond motif [H5···O1ii 2.41 Å and C5—H5···O1ii 164.4°; symmetry code (ii): -x, -1 - y, -z] (Fig. 2). The same motif exists in the divalent Ni complex of pyrithione (Chen et al., 1991), in which a cis square-planar geometry leads to the formation of discrete dimers rather than extended chains.

Molecules of (I) in adjacent chains are stacked such that S1 in one molecule lies directly above Cu1 in an adjacent molecule, with Cu1···S1iii 3.4447 (13) Å [symmetry code (iii): 1 - x, -y, -z]. The same arrangement exists below Cu1 [Cu1···S1iv; symmetry code (iv): -1 - x, -y, -z], such that the coordination geometry around it may be considered to be a tetragonally distorted octahedron (Fig. 3), i.e. a Jahn-Teller distorted octahedral geometry about CuII (d9). Molecules of (I) therefore form extended stacks containing edge-sharing octahedra along the [100] direction. Within these stacks, pyrithione rings of adjacent molecules are coplanar, with interplanar separations of 3.25 Å.

Experimental top

1-Hydroxy-2(1H)-pyridinethione (HPT) was obtained as the hydrated sodium salt, Na(PT).xH2O, from Aldrich. The CuII complex was prepared by the combination of aqueous solutions of CuCl2 and Na(PT) in a 1:2 molar ratio at room temperature. The resulting green precipitate was removed by filtration under gravity and dried in air at room temperature. Attempts to prepare single crystals of (I) suitable for X-ray diffraction using laboratory instruments were unsuccessful, since the material consistently crystallizes as florets of fine needles. Data were therefore collected at Station 9.8, Daresbury SRS, England, from a needle cut from a floret grown by slow evaporation of a solution of (I) in dimethylsulfoxide.

Refinement top

The absorption correction was applied by SADABS (Sheldrick, 1997). However, note that the transmission factors are not real, since they include corrections for beam decay and possibly crystal decay (the two cannot be distinguished). The numbers listed in the CIF are those calculated by SHELXL97 (Sheldrick, 1997). H atoms were placed geometrically and allowed to ride during subsequent refinement, with a C—H distance of 0.95 Å and an isotropic displacement parameter fixed at 1.2 times Ueq for the carbon to which they were attached. For subsequent discussion of the structure, the H-atom positions derived from the X-ray results were normalized to standard neutron-derived values (Allen et al., 1987) along the C—H vector.

Computing details top

Data collection: SMART (Bruker, 1998); cell refinement: LSCELL (Clegg, 1997); data reduction: SAINT (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: XP in SHELXTL (Siemens, 1996) and CAMERON (Watkin et al., 1996); software used to prepare material for publication: SHELXL97.

Figures top
[Figure 1] Fig. 1. The molecular unit in (I), showing displacement ellipsoids at the 50% probability level and H atoms as small spheres of arbitrary radii [symmetry code (i): -x, -y, -z].
[Figure 2] Fig. 2. The projection onto (100) showing chains of (I) linked via C—H···O interactions.
[Figure 3] Fig. 3. The coordination geometry around Cu1, illustrating the axial Jahn-Teller distortion.
Bis(1-hydroxy-2(1H)-pyridinethiolato-S2,O)copper(II) top
Crystal data top
[Cu(C5H4NOS)2]Z = 1
Mr = 315.84F(000) = 159
Triclinic, P1Dx = 1.917 Mg m3
a = 4.0545 (7) ÅSynchrotron radiation, λ = 0.6884 Å
b = 7.5723 (12) ÅCell parameters from 1797 reflections
c = 9.0629 (14) Åθ = 3.2–29.1°
α = 81.096 (4)°µ = 2.37 mm1
β = 86.190 (4)°T = 150 K
γ = 85.197 (4)°Needle, green
V = 273.53 (8) Å30.04 × 0.02 × 0.01 mm
Data collection top
Bruker SMART CCD
diffractometer
1430 independent reflections
Radiation source: Daresbury SRS, Station 9.81074 reflections with I > 2σ(I)
Silicon 111 monochromatorRint = 0.044
Detector resolution: 8.192 pixels mm-1θmax = 29.2°, θmin = 2.2°
thin slice ω–scansh = 55
Absorption correction: multi-scan
(SADABS; Sheldrick, 1997)
k = 1010
Tmin = 0.911, Tmax = 0.977l = 1212
2505 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.061Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.161H-atom parameters constrained
S = 1.01 w = 1/[σ2(Fo2) + (0.1051P)2]
where P = (Fo2 + 2Fc2)/3
1430 reflections(Δ/σ)max = 0.011
79 parametersΔρmax = 1.29 e Å3
0 restraintsΔρmin = 1.04 e Å3
Crystal data top
[Cu(C5H4NOS)2]γ = 85.197 (4)°
Mr = 315.84V = 273.53 (8) Å3
Triclinic, P1Z = 1
a = 4.0545 (7) ÅSynchrotron radiation, λ = 0.6884 Å
b = 7.5723 (12) ŵ = 2.37 mm1
c = 9.0629 (14) ÅT = 150 K
α = 81.096 (4)°0.04 × 0.02 × 0.01 mm
β = 86.190 (4)°
Data collection top
Bruker SMART CCD
diffractometer
1430 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 1997)
1074 reflections with I > 2σ(I)
Tmin = 0.911, Tmax = 0.977Rint = 0.044
2505 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0610 restraints
wR(F2) = 0.161H-atom parameters constrained
S = 1.01Δρmax = 1.29 e Å3
1430 reflectionsΔρmin = 1.04 e Å3
79 parameters
Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Cu10.00000.00000.00000.0156 (3)
S10.3100 (3)0.08589 (14)0.20927 (12)0.0220 (3)
O10.0855 (8)0.2449 (4)0.0387 (3)0.0202 (7)
N10.3049 (9)0.2690 (5)0.1544 (4)0.0162 (7)
C10.4313 (11)0.1253 (6)0.2437 (5)0.0163 (8)
C20.6546 (10)0.1627 (6)0.3620 (5)0.0178 (9)
H20.74830.06650.42670.021*
C30.7394 (12)0.3346 (7)0.3859 (5)0.0234 (10)
H30.88840.35740.46740.028*
C40.6059 (12)0.4779 (6)0.2897 (5)0.0224 (9)
H40.66560.59820.30440.027*
C50.3904 (12)0.4416 (6)0.1754 (5)0.0194 (9)
H50.29820.53720.10950.023*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cu10.0202 (4)0.0153 (4)0.0118 (4)0.0028 (3)0.0023 (3)0.0045 (3)
S10.0284 (7)0.0167 (6)0.0205 (6)0.0027 (5)0.0067 (5)0.0040 (5)
O10.0260 (16)0.0195 (15)0.0146 (15)0.0034 (13)0.0077 (13)0.0045 (12)
N10.0149 (16)0.0232 (19)0.0124 (17)0.0029 (15)0.0004 (13)0.0082 (14)
C10.0154 (18)0.020 (2)0.0136 (19)0.0007 (16)0.0043 (16)0.0007 (15)
C20.0131 (18)0.024 (2)0.015 (2)0.0021 (17)0.0008 (16)0.0006 (16)
C30.025 (2)0.026 (2)0.020 (2)0.0003 (19)0.0013 (19)0.0074 (18)
C40.027 (2)0.018 (2)0.021 (2)0.0022 (19)0.0023 (19)0.0025 (17)
C50.026 (2)0.0161 (19)0.016 (2)0.0014 (18)0.0054 (18)0.0025 (15)
Geometric parameters (Å, º) top
Cu1—O1i1.939 (3)C1—C21.405 (6)
Cu1—O11.939 (3)C2—C31.365 (6)
Cu1—S1i2.2445 (11)C2—H20.9500
Cu1—S12.2445 (11)C3—C41.405 (7)
S1—C11.703 (4)C3—H30.9500
O1—N11.354 (5)C4—C51.356 (7)
N1—C51.362 (6)C4—H40.9500
N1—C11.366 (6)C5—H50.9500
O1i—Cu1—O1180.0C2—C1—S1123.6 (3)
O1i—Cu1—S1i87.96 (9)C3—C2—C1121.2 (4)
O1—Cu1—S1i92.04 (9)C3—C2—H2119.4
O1i—Cu1—S192.04 (9)C1—C2—H2119.4
O1—Cu1—S187.96 (9)C2—C3—C4119.8 (4)
S1i—Cu1—S1180.0C2—C3—H3120.1
C1—S1—Cu195.67 (15)C4—C3—H3120.1
N1—O1—Cu1115.7 (3)C5—C4—C3118.9 (4)
O1—N1—C5116.6 (4)C5—C4—H4120.6
O1—N1—C1120.6 (4)C3—C4—H4120.6
C5—N1—C1122.8 (4)C4—C5—N1120.5 (4)
N1—C1—C2116.7 (4)C4—C5—H5119.7
N1—C1—S1119.6 (3)N1—C5—H5119.7
O1i—Cu1—S1—C1174.65 (17)Cu1—S1—C1—N14.5 (4)
O1—Cu1—S1—C15.35 (17)Cu1—S1—C1—C2176.5 (4)
S1i—Cu1—O1—N1173.5 (3)N1—C1—C2—C30.0 (7)
S1—Cu1—O1—N16.5 (3)S1—C1—C2—C3179.0 (3)
Cu1—O1—N1—C5174.5 (3)C1—C2—C3—C40.9 (7)
Cu1—O1—N1—C15.3 (5)C2—C3—C4—C50.9 (7)
O1—N1—C1—C2179.3 (4)C3—C4—C5—N10.0 (7)
C5—N1—C1—C20.9 (6)O1—N1—C5—C4179.3 (4)
O1—N1—C1—S10.3 (6)C1—N1—C5—C40.9 (7)
C5—N1—C1—S1179.9 (3)
Symmetry code: (i) x, y, z.

Experimental details

Crystal data
Chemical formula[Cu(C5H4NOS)2]
Mr315.84
Crystal system, space groupTriclinic, P1
Temperature (K)150
a, b, c (Å)4.0545 (7), 7.5723 (12), 9.0629 (14)
α, β, γ (°)81.096 (4), 86.190 (4), 85.197 (4)
V3)273.53 (8)
Z1
Radiation typeSynchrotron, λ = 0.6884 Å
µ (mm1)2.37
Crystal size (mm)0.04 × 0.02 × 0.01
Data collection
DiffractometerBruker SMART CCD
diffractometer
Absorption correctionMulti-scan
(SADABS; Sheldrick, 1997)
Tmin, Tmax0.911, 0.977
No. of measured, independent and
observed [I > 2σ(I)] reflections
2505, 1430, 1074
Rint0.044
(sin θ/λ)max1)0.708
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.061, 0.161, 1.01
No. of reflections1430
No. of parameters79
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)1.29, 1.04

Computer programs: SMART (Bruker, 1998), LSCELL (Clegg, 1997), SAINT (Bruker, 1998), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), XP in SHELXTL (Siemens, 1996) and CAMERON (Watkin et al., 1996), SHELXL97.

Selected geometric parameters (Å, º) top
Cu1—O11.939 (3)N1—C11.366 (6)
Cu1—S12.2445 (11)C1—C21.405 (6)
S1—C11.703 (4)C2—C31.365 (6)
O1—N11.354 (5)C3—C41.405 (7)
N1—C51.362 (6)C4—C51.356 (7)
O1i—Cu1—O1180.0S1i—Cu1—S1180.0
O1i—Cu1—S1i87.96 (9)C1—S1—Cu195.67 (15)
O1—Cu1—S1i92.04 (9)N1—O1—Cu1115.7 (3)
O1i—Cu1—S192.04 (9)O1—N1—C5116.6 (4)
O1—Cu1—S187.96 (9)O1—N1—C1120.6 (4)
Symmetry code: (i) x, y, z.
 

Follow Acta Cryst. C
Sign up for e-alerts
Follow Acta Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds