metal-organic compounds
Dichlorido(4-methoxy-2-{[2-(piperazin-4-ium-1-yl)ethyl]iminomethyl}phenolate)cadmium
aDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: khaledi@siswa.um.edu.my
In the title compound, [CdCl2(C14H21N3O2)], the Schiff base ligand chelates the CdII ion in an N,N,O-tridentate fashion. Two Cl atoms complete a distorted square-pyramidal coordination environment around the metal atom. In the crystal, adjacent molecules are linked through C—H⋯π interactions into infinite chains along the a axis. The molecules are further connected into a three-dimensional network via N—H⋯O, N—H⋯Cl and C—H⋯Cl interactions. The ethylene group is disordered over two sets of sites in a 0.520 (10):0.480 (10) ratio.
Related literature
For similar structures, see: Mukhopadhyay et al. (2003); Xu et al. (2008); Saleh Salga et al. (2010). For a description of the geometry of complexes with five-coordinated metal ions, see: Addison et al. (1984).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: SHELXL97 and publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536811022100/xu5230sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811022100/xu5230Isup2.hkl
A mixture of 5-methoxysalicylaldehyde (0.35 g, 2.3 mmol) and aminoethylpiperazine (0.3 g, 2.3 mmol) in ethanol (20 ml) was refluxed for 2 h, followed by addition of a solution of cadmium(II) chloride (0.42 g, 2.3 mmol) in a minimum amount of ethanol. The resulting solution was refluxed for 1 h and then left at room temperature for one day to give the X-ray quality crystals of the title compound.
The C-bound hydrogen atoms were placed at calculated positions and refined as riding atoms with C—H distances of 0.95 (aryl), 0.98 (methyl) and 0.99 Å (methylene). The N-bound hydrogen atoms were located in a difference Fourier map and refined with distance restraint of N—H 0.91 (2) Å. For all hydrogen atoms Uiso(H) were set to 1.2 (1.5 for methyl)Ueq(carrier atom). C9 and C10 were found to be disordered with two positions being resolved for each of the atoms. From anisotropic
the site occupancy factor of the major component refined is 0.52 (1). The corresponding bond distances involving the disordered atoms were restrained to be equal with the SADI command in SHELXL97 (Sheldrick, 2008).Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and publCIF (Westrip, 2010).Fig. 1. Thermal ellipsoid plot of the title compound at the 50% probability level. Hydrogen atoms are drawn as spheres of arbitrary radius. Only the major disordered component is shown. |
[CdCl2(C14H21N3O2)] | F(000) = 896 |
Mr = 446.64 | Dx = 1.788 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 4675 reflections |
a = 10.1173 (9) Å | θ = 2.4–30.3° |
b = 16.2686 (15) Å | µ = 1.65 mm−1 |
c = 10.3486 (10) Å | T = 100 K |
β = 103.069 (1)° | Plate, yellow |
V = 1659.2 (3) Å3 | 0.25 × 0.18 × 0.04 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3624 independent reflections |
Radiation source: fine-focus sealed tube | 3138 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.040 |
ϕ and ω scans | θmax = 27.0°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −12→12 |
Tmin = 0.684, Tmax = 0.937 | k = −20→20 |
14540 measured reflections | l = −12→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)] = 0.031 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.061 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0115P)2 + 3.0473P] where P = (Fo2 + 2Fc2)/3 |
3624 reflections | (Δ/σ)max < 0.001 |
225 parameters | Δρmax = 0.65 e Å−3 |
5 restraints | Δρmin = −0.78 e Å−3 |
[CdCl2(C14H21N3O2)] | V = 1659.2 (3) Å3 |
Mr = 446.64 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 10.1173 (9) Å | µ = 1.65 mm−1 |
b = 16.2686 (15) Å | T = 100 K |
c = 10.3486 (10) Å | 0.25 × 0.18 × 0.04 mm |
β = 103.069 (1)° |
Bruker APEXII CCD diffractometer | 3624 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3138 reflections with I > 2σ(I) |
Tmin = 0.684, Tmax = 0.937 | Rint = 0.040 |
14540 measured reflections |
R[F2 > 2σ(F2)] = 0.031 | 5 restraints |
wR(F2) = 0.061 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | Δρmax = 0.65 e Å−3 |
3624 reflections | Δρmin = −0.78 e Å−3 |
225 parameters |
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. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
Cd1 | 0.34107 (2) | −0.052048 (13) | 0.68131 (2) | 0.01663 (7) | |
Cl1 | 0.56656 (8) | −0.11579 (5) | 0.74780 (10) | 0.0354 (2) | |
Cl2 | 0.23070 (8) | −0.07175 (5) | 0.87000 (8) | 0.02395 (17) | |
O1 | 0.2602 (2) | −0.15436 (13) | 0.5407 (2) | 0.0251 (5) | |
O2 | −0.1051 (2) | −0.17553 (14) | 0.0579 (2) | 0.0268 (5) | |
N1 | 0.2318 (3) | 0.02551 (17) | 0.5110 (3) | 0.0360 (8) | |
N2 | 0.4238 (3) | 0.08960 (15) | 0.7371 (3) | 0.0201 (6) | |
N3 | 0.6073 (3) | 0.20036 (17) | 0.9144 (3) | 0.0282 (7) | |
H3A | 0.644 (3) | 0.2509 (14) | 0.941 (4) | 0.034* | |
H3B | 0.647 (3) | 0.1620 (18) | 0.972 (3) | 0.034* | |
C1 | 0.1647 (3) | −0.15272 (19) | 0.4325 (3) | 0.0213 (7) | |
C2 | 0.1038 (3) | −0.22708 (19) | 0.3799 (4) | 0.0250 (7) | |
H2 | 0.1240 | −0.2756 | 0.4316 | 0.030* | |
C3 | 0.0166 (3) | −0.2327 (2) | 0.2574 (4) | 0.0259 (7) | |
H3 | −0.0201 | −0.2846 | 0.2257 | 0.031* | |
C4 | −0.0181 (3) | −0.16303 (19) | 0.1797 (3) | 0.0199 (6) | |
C5 | 0.0301 (3) | −0.08803 (19) | 0.2301 (3) | 0.0221 (7) | |
H5 | 0.0028 | −0.0398 | 0.1792 | 0.027* | |
C6 | 0.1199 (3) | −0.08094 (18) | 0.3567 (3) | 0.0198 (6) | |
C7 | 0.1562 (4) | 0.0024 (2) | 0.3998 (4) | 0.0336 (9) | |
H7 | 0.1201 | 0.0448 | 0.3390 | 0.040* | |
C8 | −0.1108 (3) | −0.1114 (2) | −0.0365 (3) | 0.0277 (7) | |
H8A | −0.1539 | −0.0629 | −0.0077 | 0.042* | |
H8B | −0.1639 | −0.1297 | −0.1230 | 0.042* | |
H8C | −0.0186 | −0.0974 | −0.0440 | 0.042* | |
C9 | 0.2794 (9) | 0.1146 (3) | 0.5179 (6) | 0.027 (2) | 0.520 (10) |
H9A | 0.3623 | 0.1195 | 0.4828 | 0.033* | 0.520 (10) |
H9B | 0.2081 | 0.1500 | 0.4639 | 0.033* | 0.520 (10) |
C10 | 0.3083 (6) | 0.1410 (3) | 0.6602 (6) | 0.0207 (17) | 0.520 (10) |
H10A | 0.2267 | 0.1333 | 0.6965 | 0.025* | 0.520 (10) |
H10B | 0.3334 | 0.1999 | 0.6674 | 0.025* | 0.520 (10) |
C9' | 0.2199 (7) | 0.1130 (4) | 0.5540 (8) | 0.0213 (18) | 0.480 (10) |
H9C | 0.1786 | 0.1483 | 0.4775 | 0.026* | 0.480 (10) |
H9D | 0.1646 | 0.1166 | 0.6215 | 0.026* | 0.480 (10) |
C10' | 0.3645 (7) | 0.1373 (4) | 0.6114 (7) | 0.0227 (19) | 0.480 (10) |
H10C | 0.3686 | 0.1969 | 0.6314 | 0.027* | 0.480 (10) |
H10D | 0.4195 | 0.1270 | 0.5452 | 0.027* | 0.480 (10) |
C11 | 0.5665 (4) | 0.0977 (2) | 0.7352 (4) | 0.0374 (10) | |
H11A | 0.5772 | 0.0875 | 0.6438 | 0.045* | |
H11B | 0.6185 | 0.0549 | 0.7932 | 0.045* | |
C12 | 0.6273 (4) | 0.1815 (2) | 0.7807 (4) | 0.0363 (9) | |
H12A | 0.7255 | 0.1814 | 0.7821 | 0.044* | |
H12B | 0.5833 | 0.2244 | 0.7175 | 0.044* | |
C13 | 0.4637 (4) | 0.1933 (2) | 0.9208 (4) | 0.0407 (10) | |
H13A | 0.4098 | 0.2365 | 0.8652 | 0.049* | |
H13B | 0.4550 | 0.2012 | 1.0134 | 0.049* | |
C14 | 0.4095 (4) | 0.1085 (2) | 0.8714 (4) | 0.0441 (11) | |
H14A | 0.4583 | 0.0662 | 0.9329 | 0.053* | |
H14B | 0.3123 | 0.1054 | 0.8735 | 0.053* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cd1 | 0.01874 (11) | 0.01363 (11) | 0.01584 (12) | −0.00060 (9) | 0.00039 (8) | 0.00174 (9) |
Cl1 | 0.0207 (4) | 0.0231 (4) | 0.0576 (6) | 0.0037 (3) | −0.0014 (4) | 0.0042 (4) |
Cl2 | 0.0276 (4) | 0.0202 (4) | 0.0259 (4) | −0.0011 (3) | 0.0097 (3) | 0.0048 (3) |
O1 | 0.0382 (13) | 0.0120 (10) | 0.0204 (12) | 0.0043 (9) | −0.0033 (10) | 0.0012 (9) |
O2 | 0.0250 (12) | 0.0280 (13) | 0.0245 (13) | −0.0034 (10) | −0.0007 (10) | −0.0050 (10) |
N1 | 0.060 (2) | 0.0154 (14) | 0.0215 (16) | 0.0037 (14) | −0.0132 (15) | −0.0005 (12) |
N2 | 0.0188 (13) | 0.0163 (12) | 0.0217 (15) | −0.0021 (10) | −0.0028 (11) | 0.0021 (11) |
N3 | 0.0386 (17) | 0.0143 (13) | 0.0228 (17) | −0.0021 (12) | −0.0119 (13) | −0.0002 (11) |
C1 | 0.0189 (15) | 0.0175 (15) | 0.0274 (18) | 0.0022 (12) | 0.0050 (13) | 0.0013 (13) |
C2 | 0.0249 (17) | 0.0140 (15) | 0.033 (2) | 0.0000 (13) | 0.0008 (14) | 0.0041 (14) |
C3 | 0.0233 (16) | 0.0178 (15) | 0.035 (2) | −0.0022 (13) | 0.0036 (15) | −0.0054 (14) |
C4 | 0.0135 (14) | 0.0259 (16) | 0.0187 (16) | 0.0003 (12) | 0.0004 (12) | −0.0044 (13) |
C5 | 0.0251 (16) | 0.0184 (15) | 0.0226 (18) | 0.0016 (13) | 0.0049 (13) | 0.0031 (13) |
C6 | 0.0256 (16) | 0.0150 (14) | 0.0179 (17) | 0.0009 (12) | 0.0032 (13) | −0.0023 (12) |
C7 | 0.053 (2) | 0.0176 (16) | 0.0223 (19) | 0.0073 (16) | −0.0088 (17) | 0.0040 (14) |
C8 | 0.0235 (17) | 0.0355 (19) | 0.0224 (19) | 0.0033 (14) | 0.0015 (14) | −0.0050 (15) |
C9 | 0.040 (5) | 0.012 (3) | 0.021 (4) | 0.003 (3) | −0.010 (3) | −0.004 (3) |
C10 | 0.020 (3) | 0.012 (3) | 0.027 (4) | −0.003 (2) | −0.002 (3) | −0.004 (3) |
C9' | 0.023 (4) | 0.020 (4) | 0.020 (4) | 0.007 (3) | 0.002 (3) | 0.000 (3) |
C10' | 0.031 (4) | 0.014 (3) | 0.021 (4) | −0.005 (3) | 0.004 (3) | 0.001 (3) |
C11 | 0.034 (2) | 0.034 (2) | 0.053 (3) | −0.0217 (16) | 0.0285 (19) | −0.0279 (18) |
C12 | 0.0297 (19) | 0.0302 (19) | 0.057 (3) | −0.0137 (15) | 0.0255 (18) | −0.0224 (18) |
C13 | 0.060 (3) | 0.0272 (19) | 0.046 (3) | −0.0171 (18) | 0.035 (2) | −0.0180 (17) |
C14 | 0.062 (3) | 0.0273 (19) | 0.058 (3) | −0.0221 (18) | 0.044 (2) | −0.0194 (19) |
Cd1—O1 | 2.241 (2) | C5—H5 | 0.9500 |
Cd1—N1 | 2.245 (3) | C6—C7 | 1.448 (4) |
Cd1—N2 | 2.475 (2) | C7—H7 | 0.9500 |
Cd1—Cl1 | 2.4584 (8) | C8—H8A | 0.9800 |
Cd1—Cl2 | 2.4797 (8) | C8—H8B | 0.9800 |
O1—C1 | 1.303 (4) | C8—H8C | 0.9800 |
O2—C4 | 1.380 (4) | C9—C10 | 1.498 (7) |
O2—C8 | 1.421 (4) | C9—H9A | 0.9900 |
N1—C7 | 1.285 (4) | C9—H9B | 0.9900 |
N1—C9' | 1.505 (6) | C10—H10A | 0.9900 |
N1—C9 | 1.524 (6) | C10—H10B | 0.9900 |
N2—C11 | 1.455 (4) | C9'—C10' | 1.503 (7) |
N2—C14 | 1.462 (4) | C9'—H9C | 0.9900 |
N2—C10 | 1.509 (6) | C9'—H9D | 0.9900 |
N2—C10' | 1.518 (6) | C10'—H10C | 0.9900 |
N3—C13 | 1.474 (5) | C10'—H10D | 0.9900 |
N3—C12 | 1.476 (5) | C11—C12 | 1.525 (4) |
N3—H3A | 0.918 (18) | C11—H11A | 0.9900 |
N3—H3B | 0.897 (18) | C11—H11B | 0.9900 |
C1—C2 | 1.410 (4) | C12—H12A | 0.9900 |
C1—C6 | 1.423 (4) | C12—H12B | 0.9900 |
C2—C3 | 1.373 (5) | C13—C14 | 1.529 (5) |
C2—H2 | 0.9500 | C13—H13A | 0.9900 |
C3—C4 | 1.388 (5) | C13—H13B | 0.9900 |
C3—H3 | 0.9500 | C14—H14A | 0.9900 |
C4—C5 | 1.372 (4) | C14—H14B | 0.9900 |
C5—C6 | 1.420 (4) | ||
O1—Cd1—N1 | 82.23 (9) | O2—C8—H8A | 109.5 |
O1—Cd1—Cl1 | 92.75 (6) | O2—C8—H8B | 109.5 |
N1—Cd1—Cl1 | 135.90 (10) | H8A—C8—H8B | 109.5 |
O1—Cd1—N2 | 153.88 (8) | O2—C8—H8C | 109.5 |
N1—Cd1—N2 | 74.96 (9) | H8A—C8—H8C | 109.5 |
Cl1—Cd1—N2 | 94.82 (6) | H8B—C8—H8C | 109.5 |
O1—Cd1—Cl2 | 104.60 (6) | C10—C9—N1 | 107.9 (5) |
N1—Cd1—Cl2 | 117.46 (9) | C10—C9—H9A | 110.1 |
Cl1—Cd1—Cl2 | 106.24 (3) | N1—C9—H9A | 110.1 |
N2—Cd1—Cl2 | 97.20 (7) | C10—C9—H9B | 110.1 |
C1—O1—Cd1 | 129.33 (19) | N1—C9—H9B | 110.1 |
C4—O2—C8 | 116.0 (2) | H9A—C9—H9B | 108.4 |
C7—N1—C9' | 118.1 (4) | C9—C10—N2 | 108.4 (5) |
C7—N1—C9 | 116.0 (4) | C9—C10—H10A | 110.0 |
C9'—N1—C9 | 29.7 (3) | N2—C10—H10A | 110.0 |
C7—N1—Cd1 | 128.7 (2) | C9—C10—H10B | 110.0 |
C9'—N1—Cd1 | 111.0 (3) | N2—C10—H10B | 110.0 |
C9—N1—Cd1 | 113.8 (3) | H10A—C10—H10B | 108.4 |
C11—N2—C14 | 107.8 (3) | C10'—C9'—N1 | 103.3 (5) |
C11—N2—C10 | 126.5 (4) | C10'—C9'—H9C | 111.1 |
C14—N2—C10 | 98.8 (4) | N1—C9'—H9C | 111.1 |
C11—N2—C10' | 98.2 (4) | C10'—C9'—H9D | 111.1 |
C14—N2—C10' | 127.0 (4) | N1—C9'—H9D | 111.1 |
C10—N2—C10' | 32.4 (3) | H9C—C9'—H9D | 109.1 |
C11—N2—Cd1 | 111.46 (19) | C9'—C10'—N2 | 111.4 (6) |
C14—N2—Cd1 | 108.48 (19) | C9'—C10'—H10C | 109.3 |
C10—N2—Cd1 | 102.3 (3) | N2—C10'—H10C | 109.3 |
C10'—N2—Cd1 | 103.2 (3) | C9'—C10'—H10D | 109.3 |
C13—N3—C12 | 111.8 (3) | N2—C10'—H10D | 109.3 |
C13—N3—H3A | 113 (2) | H10C—C10'—H10D | 108.0 |
C12—N3—H3A | 110 (2) | N2—C11—C12 | 114.2 (3) |
C13—N3—H3B | 103 (2) | N2—C11—H11A | 108.7 |
C12—N3—H3B | 110 (2) | C12—C11—H11A | 108.7 |
H3A—N3—H3B | 109 (3) | N2—C11—H11B | 108.7 |
O1—C1—C2 | 119.3 (3) | C12—C11—H11B | 108.7 |
O1—C1—C6 | 124.9 (3) | H11A—C11—H11B | 107.6 |
C2—C1—C6 | 115.7 (3) | N3—C12—C11 | 110.1 (3) |
C3—C2—C1 | 123.2 (3) | N3—C12—H12A | 109.6 |
C3—C2—H2 | 118.4 | C11—C12—H12A | 109.6 |
C1—C2—H2 | 118.4 | N3—C12—H12B | 109.6 |
C2—C3—C4 | 120.4 (3) | C11—C12—H12B | 109.6 |
C2—C3—H3 | 119.8 | H12A—C12—H12B | 108.2 |
C4—C3—H3 | 119.8 | N3—C13—C14 | 109.8 (3) |
C5—C4—O2 | 125.2 (3) | N3—C13—H13A | 109.7 |
C5—C4—C3 | 119.0 (3) | C14—C13—H13A | 109.7 |
O2—C4—C3 | 115.8 (3) | N3—C13—H13B | 109.7 |
C4—C5—C6 | 121.4 (3) | C14—C13—H13B | 109.7 |
C4—C5—H5 | 119.3 | H13A—C13—H13B | 108.2 |
C6—C5—H5 | 119.3 | N2—C14—C13 | 113.8 (3) |
C5—C6—C1 | 120.0 (3) | N2—C14—H14A | 108.8 |
C5—C6—C7 | 115.2 (3) | C13—C14—H14A | 108.8 |
C1—C6—C7 | 124.8 (3) | N2—C14—H14B | 108.8 |
N1—C7—C6 | 127.5 (3) | C13—C14—H14B | 108.8 |
N1—C7—H7 | 116.3 | H14A—C14—H14B | 107.7 |
C6—C7—H7 | 116.3 |
Cg1 is the centroid of the C1–C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···O1i | 0.92 (2) | 1.80 (2) | 2.705 (3) | 166 (4) |
N3—H3B···Cl2ii | 0.90 (2) | 2.33 (2) | 3.222 (3) | 174 (4) |
C9—H9A···Cl1iii | 0.99 | 2.64 | 3.454 (8) | 139 |
C8—H8A···Cl2iv | 0.98 | 2.82 | 3.777 (3) | 167 |
C8—H8B···Cl1v | 0.98 | 2.76 | 3.514 (3) | 134 |
C13—H13A···Cl1i | 0.99 | 2.71 | 3.542 (4) | 142 |
C12—H12A···Cg1vi | 0.99 | 2.48 | 3.408 (4) | 156 |
C9′—H9D···Cg1iv | 0.99 | 2.72 | 3.620 (8) | 151 |
Symmetry codes: (i) −x+1, y+1/2, −z+3/2; (ii) −x+1, −y, −z+2; (iii) −x+1, −y, −z+1; (iv) −x, −y, −z+1; (v) x−1, y, z−1; (vi) −x, −y+1, −z. |
Experimental details
Crystal data | |
Chemical formula | [CdCl2(C14H21N3O2)] |
Mr | 446.64 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 10.1173 (9), 16.2686 (15), 10.3486 (10) |
β (°) | 103.069 (1) |
V (Å3) | 1659.2 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.65 |
Crystal size (mm) | 0.25 × 0.18 × 0.04 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.684, 0.937 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14540, 3624, 3138 |
Rint | 0.040 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.031, 0.061, 1.07 |
No. of reflections | 3624 |
No. of parameters | 225 |
No. of restraints | 5 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.65, −0.78 |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), X-SEED (Barbour, 2001), SHELXL97 (Sheldrick, 2008) and publCIF (Westrip, 2010).
Cd1—O1 | 2.241 (2) | Cd1—Cl1 | 2.4584 (8) |
Cd1—N1 | 2.245 (3) | Cd1—Cl2 | 2.4797 (8) |
Cd1—N2 | 2.475 (2) |
Cg1 is the centroid of the C1–C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···O1i | 0.921 (19) | 1.80 (2) | 2.705 (3) | 166 (4) |
N3—H3B···Cl2ii | 0.901 (19) | 2.33 (2) | 3.222 (3) | 174 (4) |
C9—H9A···Cl1iii | 0.99 | 2.64 | 3.454 (8) | 139 |
C8—H8A···Cl2iv | 0.98 | 2.82 | 3.777 (3) | 167 |
C8—H8B···Cl1v | 0.98 | 2.76 | 3.514 (3) | 134 |
C13—H13A···Cl1i | 0.99 | 2.71 | 3.542 (4) | 142 |
C12—H12A···Cg1vi | 0.99 | 2.48 | 3.408 (4) | 156 |
C9'—H9D···Cg1iv | 0.99 | 2.72 | 3.620 (8) | 151 |
Symmetry codes: (i) −x+1, y+1/2, −z+3/2; (ii) −x+1, −y, −z+2; (iii) −x+1, −y, −z+1; (iv) −x, −y, −z+1; (v) x−1, y, z−1; (vi) −x, −y+1, −z. |
Acknowledgements
The authors thank the University of Malaya for funding this study (FRGS grant No. FP004/2010B).
References
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The ligands containing a piperazine ring have been reported to possess ambidentate character, capable of binding metal centers through one or both piperazine N atoms (Mukhopadhyay et al., 2003; Xu et al., 2008; Saleh Salga et al., 2010). The coordination mode depends largely on the conformation (chair or boat) adopted by the ring which, in turn, depends on the metal salt entity and remote substituations in the ligand. In the present structure, the piperazine ring assumes a chair conformation and employs only one of the ring N atoms to bind to the metal center. The Schiff base ligand chelates the metal atom in an N,N,O-mode, along with two Cl atoms makes a distorted square-pyramidal cadmium(II) complex. The distortion from the ideal geometry is evident from the τ index of 0.30 (τ is 0 for an ideal square-pyramid and is 1 for a perfect trigonal-bipyramid, Addison et al., 1984). The other ring N atom stays away from the chelation, and is protonated to keep the electronutrality of the molecule, thus the complex can be described as a zwitterion. In the crystal, C—H···π interactions link the molecules into infinite chains along the a axis and these are connected into a three-dimensional network via N—H···O, N—H···Cl and C—H···Cl hydrogen bonds (Table 1).