metal-organic compounds
of new organically templated copper sulfate with 2-aminopyridinium
aInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna str. 2, PO Box 1410, 50-950 Wroclaw, Poland
*Correspondence e-mail: T.Lukianova@int.pan.wroc.pl
The title compound, (C5H7N2)2[Cu(H2O)6](SO4)2·4H2O [systematic name: bis(2-aminopyridinium) hexaaquacopper(II) bis(sulfate) tetrahydrate], comprises axially elongated hexaaqua-coordinated octahedral CuII ions located on an inversion centre, non-coordinating sulfate anions, 2-aminopyridinium cations and lattice water molecules. The is built of successive inorganic and organic layers extending parallel to (001) that are connected by an extensive three-dimensional hydrogen-bonded network of the type O—H⋯O and N—H⋯O, as well as π–π interactions [centroid–centroid distance 3.4140 (14) Å, offset 0.277 Å].
Keywords: crystal structure; organically templated materials; 2-aminopyridine; sulfates; hydrogen bonding; π–π interactions.
CCDC reference: 1429506
1. Related literature
For applications of 2-aminopyridine, see: Windholz (1976). For 2-aminopyridinium sulfate, see: Jebas et al. (2006). For other compounds with copper(II), see: Naïli et al. (2006); Rekik et al. (2006).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: CrysAlis PRO (Rigaku Oxford Diffraction, 2015); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS2014/7 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenburg et al., 1997); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).
Supporting information
CCDC reference: 1429506
https://doi.org/10.1107/S2056989015018629/hp2072sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015018629/hp2072Isup2.hkl
Crystal structure of I is composed of 2-aminopyridinium (2ap) cations, isolated sulfate anions, metal cations octahedrally coordinated by six water molecules [Cu(H2O)6]2+ and uncoordinated water molecules. The atom labeling scheme for compound I is shown in Fig. 1. The π-π interacting stacks of 2ap cations (Cg···Cg 3.4140 (14) Å, offset 0.277 Å) connected to inorganic layers through N–H···O hydrogen bonds (Table 1 and Fig. 3).
contains one half of Cu atom (lies on a center of inversion) along with three water molecules coordinated to it, one sulfate group, one protonated amine and two solvation water molecules. The Cu ion environment shows considerable axial deformation to tetragonal bipyramidal due to Jahn-Teller effect. The Cu–O12W and Cu–O13W distances are equal to 1.935 (2) and 1.9790 (18) Å, respectively, and the Cu–O11W distance is strongly elongated to 2.398 (2) Å. The distances within the [Cu(H2O)6]2+ octahedron are comparable to those observed in other compounds (Naïli et al., 2006; Rekik et al., 2006). The crystal packing consists of successive organic and inorganic layers parallel to 0xy plane. Inorganic layers are stabilized by a series of O–H···O hydrogen bonds (Table 1 and Fig. 2). Organic layers are built ofThe title compound was synthesized by the following method. 2-aminopyridine (0.19g, 2 mmol) was dissolved in 4 ml double distilled water to obtain solution A. The pH of the solution was adjusted to 2.5, by the addition of 30% sulfuric acid. Copper sulfate (0.149 g, 6 mmol) was dissolved in 3ml double distilled water to obtain solution B. Solution A was added on solution B. The resulting solution was kept at room temperature. The green crystals of the title compound were obtained by slow evaporation during the period of several months.
Crystal structure of I is composed of 2-aminopyridinium (2ap) cations, isolated sulfate anions, metal cations octahedrally coordinated by six water molecules [Cu(H2O)6]2+ and uncoordinated water molecules. The atom labeling scheme for compound I is shown in Fig. 1. The π-π interacting stacks of 2ap cations (Cg···Cg 3.4140 (14) Å, offset 0.277 Å) connected to inorganic layers through N–H···O hydrogen bonds (Table 1 and Fig. 3).
contains one half of Cu atom (lies on a center of inversion) along with three water molecules coordinated to it, one sulfate group, one protonated amine and two solvation water molecules. The Cu ion environment shows considerable axial deformation to tetragonal bipyramidal due to Jahn-Teller effect. The Cu–O12W and Cu–O13W distances are equal to 1.935 (2) and 1.9790 (18) Å, respectively, and the Cu–O11W distance is strongly elongated to 2.398 (2) Å. The distances within the [Cu(H2O)6]2+ octahedron are comparable to those observed in other compounds (Naïli et al., 2006; Rekik et al., 2006). The crystal packing consists of successive organic and inorganic layers parallel to 0xy plane. Inorganic layers are stabilized by a series of O–H···O hydrogen bonds (Table 1 and Fig. 2). Organic layers are built ofThe title compound was synthesized by the following method. 2-aminopyridine (0.19g, 2 mmol) was dissolved in 4 ml double distilled water to obtain solution A. The pH of the solution was adjusted to 2.5, by the addition of 30% sulfuric acid. Copper sulfate (0.149 g, 6 mmol) was dissolved in 3ml double distilled water to obtain solution B. Solution A was added on solution B. The resulting solution was kept at room temperature. The green crystals of the title compound were obtained by slow evaporation during the period of several months.
For applications of 2-aminopyridine, see: Windholz (1976). For 2-aminopyridinium sulfate, see: Jebas et al. (2006). For other compounds with copper(II), see: Naïli et al. (2006); Rekik et al. (2006).
detailsThe H atoms of water molecules were located from difference Fourier maps and were refined with O–H distances restrained to 0.840 (2) Å and Uiso(H) = 1.5 Ueq(O). In final
cycles H atoms of water were let to ride on parent O atom (AFIX 3).Data collection: CrysAlis PRO (Rigaku Oxford Diffraction, 2015); cell
CrysAlis PRO (Rigaku Oxford Diffraction, 2015); data reduction: CrysAlis PRO (Rigaku Oxford Diffraction, 2015); program(s) used to solve structure: ?SHELXS2014/7 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1997); software used to prepare material for publication: Olex2 (Dolomanov et al., 2009).
Fig. 1. The asymmetric unit of the title compound, showing the crystallographic numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. Hydrogen bonds are denoted by orange dashed lines. [Symmetry codes: (vi) -x + 1, -y + 1, -z + 1]. | |
Fig. 2. View of inorganic layers along perpendicular to this layer direction (c*). Dashed lines indicate the hydrogen bonds. | |
Fig. 3. The molecular arrangement in (C5H7N2)2[CuII(H2O)6](SO4)2·4H2O viewed along [100]. Dashed lines represent hydrogen bonds. |
(C5H7N2)2[Cu(H2O)6](SO4)2·4H2O | Z = 1 |
Mr = 626.07 | F(000) = 327 |
Triclinic, P1 | Dx = 1.629 Mg m−3 |
a = 7.115 (3) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 8.211 (3) Å | Cell parameters from 2602 reflections |
c = 12.561 (4) Å | θ = 3.3–27.4° |
α = 91.83 (3)° | µ = 1.10 mm−1 |
β = 104.59 (3)° | T = 295 K |
γ = 114.57 (3)° | Block, green |
V = 638.0 (4) Å3 | 0.35 × 0.14 × 0.13 mm |
Rigaku Oxford Diffraction Xcalibur, Sapphire2 diffractometer | 3173 independent reflections |
Radiation source: fine-focus sealed X-ray tube, Enhance (Mo) X-ray Source | 2268 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.038 |
Detector resolution: 8.2214 pixels mm-1 | θmax = 29.4°, θmin = 3.0° |
ω scans | h = −9→6 |
Absorption correction: multi-scan (CrysAlis PRO; Rigaku Oxford Diffraction, 2015) | k = −10→11 |
Tmin = 0.720, Tmax = 1.000 | l = −15→17 |
7926 measured reflections |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.044 | H-atom parameters constrained |
wR(F2) = 0.094 | w = 1/[σ2(Fo2) + (0.0324P)2 + 0.2243P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
3173 reflections | Δρmax = 0.36 e Å−3 |
160 parameters | Δρmin = −0.41 e Å−3 |
(C5H7N2)2[Cu(H2O)6](SO4)2·4H2O | γ = 114.57 (3)° |
Mr = 626.07 | V = 638.0 (4) Å3 |
Triclinic, P1 | Z = 1 |
a = 7.115 (3) Å | Mo Kα radiation |
b = 8.211 (3) Å | µ = 1.10 mm−1 |
c = 12.561 (4) Å | T = 295 K |
α = 91.83 (3)° | 0.35 × 0.14 × 0.13 mm |
β = 104.59 (3)° |
Rigaku Oxford Diffraction Xcalibur, Sapphire2 diffractometer | 3173 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Rigaku Oxford Diffraction, 2015) | 2268 reflections with I > 2σ(I) |
Tmin = 0.720, Tmax = 1.000 | Rint = 0.038 |
7926 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.094 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.36 e Å−3 |
3173 reflections | Δρmin = −0.41 e Å−3 |
160 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
Cu1 | 0.5000 | 0.5000 | 0.5000 | 0.03035 (15) | |
O11W | 0.1945 (3) | 0.4686 (3) | 0.35088 (16) | 0.0476 (5) | |
H11A | 0.1489 | 0.5468 | 0.3566 | 0.071* | |
H11B | 0.0825 | 0.3704 | 0.3272 | 0.071* | |
O12W | 0.3772 (3) | 0.2434 (2) | 0.50851 (15) | 0.0482 (6) | |
H12A | 0.3051 | 0.1679 | 0.4500 | 0.072* | |
H12B | 0.3718 | 0.1983 | 0.5673 | 0.072* | |
O13W | 0.3680 (3) | 0.5392 (2) | 0.61353 (14) | 0.0359 (4) | |
H13A | 0.3521 | 0.6347 | 0.6187 | 0.054* | |
H13B | 0.2510 | 0.4506 | 0.6110 | 0.054* | |
S1 | 0.34958 (11) | −0.04901 (9) | 0.72795 (5) | 0.03015 (17) | |
O11 | 0.5437 (3) | −0.0526 (3) | 0.80214 (15) | 0.0434 (5) | |
O12 | 0.1755 (3) | −0.1167 (3) | 0.78078 (18) | 0.0541 (6) | |
O13 | 0.3945 (4) | 0.1366 (3) | 0.70846 (16) | 0.0493 (6) | |
O14 | 0.2833 (4) | −0.1658 (3) | 0.62203 (16) | 0.0566 (6) | |
N1 | 0.6656 (4) | 0.4231 (3) | 0.89059 (17) | 0.0385 (6) | |
H1 | 0.6136 | 0.3421 | 0.8326 | 0.046* | |
N2 | 0.6983 (4) | 0.2085 (3) | 0.99866 (19) | 0.0462 (6) | |
H2A | 0.6458 | 0.1297 | 0.9395 | 0.055* | |
H2B | 0.7349 | 0.1784 | 1.0629 | 0.055* | |
C2 | 0.7227 (4) | 0.3756 (4) | 0.9910 (2) | 0.0364 (6) | |
C3 | 0.8066 (5) | 0.5115 (4) | 1.0846 (2) | 0.0484 (8) | |
H3 | 0.8482 | 0.4852 | 1.1557 | 0.058* | |
C4 | 0.8263 (5) | 0.6786 (4) | 1.0711 (3) | 0.0527 (8) | |
H4 | 0.8812 | 0.7670 | 1.1334 | 0.063* | |
C5 | 0.7659 (5) | 0.7227 (4) | 0.9654 (3) | 0.0510 (8) | |
H5 | 0.7806 | 0.8391 | 0.9566 | 0.061* | |
C6 | 0.6855 (5) | 0.5915 (4) | 0.8760 (3) | 0.0477 (8) | |
H6 | 0.6441 | 0.6171 | 0.8046 | 0.057* | |
O14W | −0.0364 (3) | 0.2860 (3) | 0.59552 (16) | 0.0432 (5) | |
H14A | −0.0658 | 0.1958 | 0.6291 | 0.065* | |
H14B | −0.1086 | 0.2458 | 0.5285 | 0.065* | |
O15W | 0.1567 (3) | 0.0248 (2) | 0.30825 (15) | 0.0381 (5) | |
H15A | 0.2371 | 0.0360 | 0.2675 | 0.057* | |
H15B | 0.0585 | 0.0513 | 0.2734 | 0.057* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cu1 | 0.0418 (3) | 0.0233 (2) | 0.0246 (2) | 0.0126 (2) | 0.0103 (2) | 0.00304 (17) |
O11W | 0.0435 (13) | 0.0422 (12) | 0.0502 (13) | 0.0187 (10) | 0.0034 (10) | −0.0031 (9) |
O12W | 0.0811 (16) | 0.0242 (10) | 0.0267 (10) | 0.0126 (10) | 0.0132 (10) | 0.0046 (8) |
O13W | 0.0416 (11) | 0.0323 (10) | 0.0345 (10) | 0.0166 (9) | 0.0121 (9) | 0.0024 (8) |
S1 | 0.0370 (4) | 0.0289 (4) | 0.0247 (3) | 0.0156 (3) | 0.0071 (3) | 0.0055 (3) |
O11 | 0.0407 (12) | 0.0640 (14) | 0.0317 (10) | 0.0304 (11) | 0.0077 (9) | 0.0081 (9) |
O12 | 0.0433 (13) | 0.0771 (16) | 0.0562 (14) | 0.0330 (12) | 0.0231 (11) | 0.0360 (12) |
O13 | 0.0755 (16) | 0.0315 (11) | 0.0321 (11) | 0.0188 (11) | 0.0090 (10) | 0.0076 (8) |
O14 | 0.0838 (17) | 0.0504 (13) | 0.0325 (11) | 0.0404 (13) | −0.0057 (11) | −0.0096 (9) |
N1 | 0.0453 (15) | 0.0451 (15) | 0.0225 (11) | 0.0202 (12) | 0.0053 (10) | 0.0028 (10) |
N2 | 0.0582 (17) | 0.0452 (15) | 0.0291 (12) | 0.0205 (13) | 0.0062 (12) | 0.0065 (10) |
C2 | 0.0369 (17) | 0.0448 (17) | 0.0254 (14) | 0.0166 (14) | 0.0081 (12) | 0.0043 (11) |
C3 | 0.051 (2) | 0.057 (2) | 0.0256 (14) | 0.0178 (17) | 0.0040 (14) | 0.0018 (13) |
C4 | 0.052 (2) | 0.050 (2) | 0.0408 (18) | 0.0150 (17) | 0.0032 (15) | −0.0090 (15) |
C5 | 0.049 (2) | 0.0418 (18) | 0.058 (2) | 0.0192 (16) | 0.0097 (17) | 0.0062 (15) |
C6 | 0.051 (2) | 0.055 (2) | 0.0384 (17) | 0.0273 (17) | 0.0093 (15) | 0.0133 (14) |
O14W | 0.0480 (13) | 0.0359 (11) | 0.0390 (11) | 0.0149 (10) | 0.0075 (10) | 0.0070 (8) |
O15W | 0.0356 (11) | 0.0438 (12) | 0.0357 (10) | 0.0190 (9) | 0.0090 (9) | 0.0048 (8) |
Cu1—O11W | 2.398 (2) | N1—C2 | 1.347 (3) |
Cu1—O11Wi | 2.398 (2) | N1—C6 | 1.353 (4) |
Cu1—O12Wi | 1.935 (2) | N2—H2A | 0.8600 |
Cu1—O12W | 1.935 (2) | N2—H2B | 0.8600 |
Cu1—O13W | 1.9790 (18) | N2—C2 | 1.319 (4) |
Cu1—O13Wi | 1.9790 (18) | C2—C3 | 1.412 (4) |
O11W—H11A | 0.8397 | C3—H3 | 0.9300 |
O11W—H11B | 0.8396 | C3—C4 | 1.341 (4) |
O12W—H12A | 0.8396 | C4—H4 | 0.9300 |
O12W—H12B | 0.8394 | C4—C5 | 1.397 (4) |
O13W—H13A | 0.8398 | C5—H5 | 0.9300 |
O13W—H13B | 0.8398 | C5—C6 | 1.355 (4) |
S1—O11 | 1.471 (2) | C6—H6 | 0.9300 |
S1—O12 | 1.466 (2) | O14W—H14A | 0.8397 |
S1—O13 | 1.464 (2) | O14W—H14B | 0.8397 |
S1—O14 | 1.462 (2) | O15W—H15A | 0.8399 |
N1—H1 | 0.8600 | O15W—H15B | 0.8401 |
O11Wi—Cu1—O11W | 180.0 | O14—S1—O11 | 109.47 (12) |
O12W—Cu1—O11W | 92.90 (9) | O14—S1—O12 | 109.29 (15) |
O12Wi—Cu1—O11Wi | 92.90 (9) | O14—S1—O13 | 109.78 (13) |
O12Wi—Cu1—O11W | 87.10 (9) | C2—N1—H1 | 118.2 |
O12W—Cu1—O11Wi | 87.10 (9) | C2—N1—C6 | 123.6 (2) |
O12Wi—Cu1—O12W | 180.0 | C6—N1—H1 | 118.2 |
O12W—Cu1—O13W | 89.66 (8) | H2A—N2—H2B | 120.0 |
O12Wi—Cu1—O13Wi | 89.66 (9) | C2—N2—H2A | 120.0 |
O12Wi—Cu1—O13W | 90.34 (8) | C2—N2—H2B | 120.0 |
O12W—Cu1—O13Wi | 90.34 (8) | N1—C2—C3 | 116.8 (3) |
O13Wi—Cu1—O11W | 88.14 (8) | N2—C2—N1 | 120.1 (2) |
O13W—Cu1—O11Wi | 88.14 (8) | N2—C2—C3 | 123.1 (3) |
O13Wi—Cu1—O11Wi | 91.86 (8) | C2—C3—H3 | 119.9 |
O13W—Cu1—O11W | 91.86 (8) | C4—C3—C2 | 120.1 (3) |
O13W—Cu1—O13Wi | 180.00 (11) | C4—C3—H3 | 119.9 |
Cu1—O11W—H11A | 115.8 | C3—C4—H4 | 119.3 |
Cu1—O11W—H11B | 122.9 | C3—C4—C5 | 121.3 (3) |
H11A—O11W—H11B | 104.7 | C5—C4—H4 | 119.3 |
Cu1—O12W—H12A | 119.8 | C4—C5—H5 | 120.9 |
Cu1—O12W—H12B | 125.3 | C6—C5—C4 | 118.2 (3) |
H12A—O12W—H12B | 114.2 | C6—C5—H5 | 120.9 |
Cu1—O13W—H13A | 118.5 | N1—C6—C5 | 119.9 (3) |
Cu1—O13W—H13B | 113.2 | N1—C6—H6 | 120.0 |
H13A—O13W—H13B | 108.7 | C5—C6—H6 | 120.0 |
O12—S1—O11 | 108.78 (12) | H14A—O14W—H14B | 106.1 |
O13—S1—O11 | 110.06 (13) | H15A—O15W—H15B | 106.7 |
O13—S1—O12 | 109.43 (13) | ||
N1—C2—C3—C4 | 0.0 (4) | C3—C4—C5—C6 | 0.3 (5) |
N2—C2—C3—C4 | −179.7 (3) | C4—C5—C6—N1 | 0.0 (5) |
C2—N1—C6—C5 | −0.3 (5) | C6—N1—C2—N2 | 179.9 (3) |
C2—C3—C4—C5 | −0.2 (5) | C6—N1—C2—C3 | 0.3 (4) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O11W—H11A···O14Wii | 0.84 | 2.00 | 2.821 (3) | 167 |
O11W—H11B···O12iii | 0.84 | 2.22 | 3.032 (4) | 162 |
O12W—H12A···O15W | 0.84 | 1.88 | 2.719 (3) | 172 |
O12W—H12B···O13 | 0.84 | 1.85 | 2.677 (3) | 171 |
O13W—H13A···O14iv | 0.84 | 1.90 | 2.733 (3) | 174 |
O13W—H13B···O14W | 0.84 | 1.88 | 2.706 (3) | 168 |
N1—H1···O13 | 0.86 | 2.03 | 2.855 (3) | 160 |
N2—H2A···O11 | 0.86 | 2.01 | 2.869 (3) | 176 |
N2—H2B···O12v | 0.86 | 2.05 | 2.914 (3) | 178 |
O14W—H14A···O15Wiii | 0.84 | 1.92 | 2.758 (3) | 174 |
O14W—H14B···O14iii | 0.84 | 1.90 | 2.738 (3) | 176 |
O15W—H15A···O11vi | 0.84 | 1.93 | 2.761 (3) | 169 |
O15W—H15B···O12iii | 0.84 | 1.93 | 2.760 (3) | 170 |
Symmetry codes: (ii) −x, −y+1, −z+1; (iii) −x, −y, −z+1; (iv) x, y+1, z; (v) −x+1, −y, −z+2; (vi) −x+1, −y, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O11W—H11A···O14Wi | 0.84 | 2.00 | 2.821 (3) | 166.6 |
O11W—H11B···O12ii | 0.84 | 2.22 | 3.032 (4) | 162.3 |
O12W—H12A···O15W | 0.84 | 1.88 | 2.719 (3) | 172.3 |
O12W—H12B···O13 | 0.84 | 1.85 | 2.677 (3) | 170.5 |
O13W—H13A···O14iii | 0.84 | 1.90 | 2.733 (3) | 173.6 |
O13W—H13B···O14W | 0.84 | 1.88 | 2.706 (3) | 167.9 |
N1—H1···O13 | 0.86 | 2.03 | 2.855 (3) | 159.9 |
N2—H2A···O11 | 0.86 | 2.01 | 2.869 (3) | 176.1 |
N2—H2B···O12iv | 0.86 | 2.05 | 2.914 (3) | 177.6 |
O14W—H14A···O15Wii | 0.84 | 1.92 | 2.758 (3) | 174.0 |
O14W—H14B···O14ii | 0.84 | 1.90 | 2.738 (3) | 175.6 |
O15W—H15A···O11v | 0.84 | 1.93 | 2.761 (3) | 169.0 |
O15W—H15B···O12ii | 0.84 | 1.93 | 2.760 (3) | 169.6 |
Symmetry codes: (i) −x, −y+1, −z+1; (ii) −x, −y, −z+1; (iii) x, y+1, z; (iv) −x+1, −y, −z+2; (v) −x+1, −y, −z+1. |
Acknowledgements
This research was supported by an ILT&SR PAS grant for young scientists and PhD students funded by the Ministry of Science and Higher Education of Poland.
References
Brandenburg, K. (1997). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. & Puschmann, H. (2009). J. Appl. Cryst. 42, 339–341. Web of Science CrossRef CAS IUCr Journals Google Scholar
Jebas, S. R., Balasubramanian, T., Peschar, R. & Fraanje, J. (2006). Acta Cryst. E62, o2606–o2607. Web of Science CSD CrossRef IUCr Journals Google Scholar
Naïli, H., Rekik, W., Bataille, T. & Mhiri, T. (2006). Polyhedron, 25, 3543–3554. Google Scholar
Rekik, W., Naïli, H., Bataille, T., Roisnel, T. & Mhiri, T. (2006). Inorg. Chim. Acta, 359, 3954–3962. Web of Science CSD CrossRef CAS Google Scholar
Rigaku Oxford Diffraction (2015). CrysAlis PRO. Rigaku Oxford Diffraction, Yarnton, England. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2015). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Windholz, M. (1976). The Merck Index, 9th ed. Boca Raton, USA: Merck & Co. Inc. Google Scholar
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