metal-organic compounds
Di-μ-iodido-bis(iodido{methyl 4-[(pyridin-2-ylmethylidene)amino]benzoate-κ2N,N′}cadmium)
aDepartment of Chemistry, North-Eastern Hill University, NEHU Permanent Campus, Umshing, Shillong 793 022, India, bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia, and cChemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia
*Correspondence e-mail: Edward.Tiekink@gmail.com
The complete binuclear molecule of the title compound, [Cd2I4(C14H12N2O2)2], is generated by the application of a centre of inversion. The Cd—I bond lengths of the central core are close and uniformly longer than the exocyclic Cd—I bond. The coordination sphere of the CdII atom is completed by two N atoms of a chelating methyl 4-[(pyridin-2-ylmethylidene)amino]benzoate ligand, and is based on a square pyramid with the terminal I atom in the apical position. The three-dimensional crystal packing is stabilized by C—H⋯O and C—H⋯π interactions, each involving the pyridine ring.
CCDC reference: 967746
Related literature
For spectroscopic, biological and structural studies of zinc triad elements with (E)-N-(pyridin-2-ylmethylidene)arylamine ligands, see: Basu Baul, Kundu, Höpfl et al. (2013); Basu Baul, Kundu, Linden et al. (2013); Basu Baul, Kundu, Mitra et al. (2013). For additional structural analysis, see: Addison et al. (1984).
Experimental
Crystal data
|
|
|
Data collection: CrysAlis PRO (Agilent, 2013); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
CCDC reference: 967746
10.1107/S160053681302905X/hg5357sup1.cif
contains datablocks general, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681302905X/hg5357Isup2.hkl
To a solution of pyridine-2-carboxaldehyde (0.10 g, 0.93 mmol) in ethanol (3 ml) was added a solution of methyl p-aminobenzoate (0.15 g, 0.99 mmol) in ethanol (2 ml). The mixture was stirred at ambient temperature for 30 min. To this reaction mixture, a solution of CdI2 (0.36 g, 0.98 mmol) in methanol (20 ml) was added drop-wise under stirring conditions which resulted in the immediate formation of a yellow precipitate. The stirring was continued for 3 h and then the mixture was filtered. The residue was washed with methanol (3 x 5 ml) and dried in vacuo. The dried solid was dissolved by boiling in acetonitrile (40 ml) and filtered while hot. The filtrate, upon cooling to r.t., afforded yellow crystalline material. Yield 43%. M. pt:. 511–513 K. Analysis, calculated for C14H12CdI2N2O2: C, 27.71, H, 1.99, N, 4.62%; Found: C, 27.82; H, 2.05; N, 4.67%. Λm(CH3CN): 7 Ω-1cm2mol-1. IR (cm-1):1717 νasym(OCO), 1591 νasym(C(H)═N). 1H-NMR (DMSO-d6; refer to Fig. 1 for atom numbering): 9.14 [d, J = 4.5 Hz, 1H, H-1], 8.73 [s, 1H, H-6], 8.16 [t, br, 1H, H-4], 8.03 [m, 3H, H-3,9,11], 7.80 [t, br, 1H, H-2], 7.57 [d, J = 8.0 Hz, 2H, H-8,12], 3.91 [s, 3H, H-14] p.p.m.. Crystals of compound suitable for X-ray crystal-structure determination were obtained from acetonitrile/chloroform by slow evaporation of the solvent at room temperature.
Carbon-bound H-atoms were placed in calculated positions [C—H 0.95 to 0.98 Å, Uiso(H) 1.2 to 1.5Ueq(C)] and were included in the
in the riding model approximation. Two reflections, i.e. (1 0 0) and (-5 0 2), were omitted from the final owing to poor agreement. The maximum and minimum residual electron density peaks of 0.58 and 1.04 e Å-3, respectively, were located 0.69 Å and 0.49 Å from the I2 and I1 atoms, respectively.Data collection: CrysAlis PRO (Agilent, 2013); cell
CrysAlis PRO (Agilent, 2013); data reduction: CrysAlis PRO (Agilent, 2013); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).[Cd2I4(C14H12N2O2)2] | Z = 1 |
Mr = 1212.91 | F(000) = 560 |
Triclinic, P1 | Dx = 2.480 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.4883 (3) Å | Cell parameters from 5933 reflections |
b = 9.3677 (5) Å | θ = 2.3–27.5° |
c = 10.9029 (5) Å | µ = 5.15 mm−1 |
α = 109.516 (5)° | T = 100 K |
β = 95.868 (3)° | Prism, yellow |
γ = 90.242 (4)° | 0.20 × 0.15 × 0.10 mm |
V = 812.18 (6) Å3 |
Agilent SuperNova Dual diffractometer with an Atlas detector | 3738 independent reflections |
Radiation source: SuperNova (Mo) X-ray Source | 3374 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.031 |
Detector resolution: 10.4041 pixels mm-1 | θmax = 27.6°, θmin = 2.3° |
ω scan | h = −10→11 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013) | k = −12→12 |
Tmin = 0.698, Tmax = 1.000 | l = −14→14 |
11886 measured reflections |
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)] = 0.022 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.050 | H-atom parameters constrained |
S = 1.00 | w = 1/[σ2(Fo2) + (0.021P)2 + 0.5485P] where P = (Fo2 + 2Fc2)/3 |
3738 reflections | (Δ/σ)max = 0.001 |
191 parameters | Δρmax = 0.58 e Å−3 |
0 restraints | Δρmin = −1.04 e Å−3 |
[Cd2I4(C14H12N2O2)2] | γ = 90.242 (4)° |
Mr = 1212.91 | V = 812.18 (6) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.4883 (3) Å | Mo Kα radiation |
b = 9.3677 (5) Å | µ = 5.15 mm−1 |
c = 10.9029 (5) Å | T = 100 K |
α = 109.516 (5)° | 0.20 × 0.15 × 0.10 mm |
β = 95.868 (3)° |
Agilent SuperNova Dual diffractometer with an Atlas detector | 3738 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013) | 3374 reflections with I > 2σ(I) |
Tmin = 0.698, Tmax = 1.000 | Rint = 0.031 |
11886 measured reflections |
R[F2 > 2σ(F2)] = 0.022 | 0 restraints |
wR(F2) = 0.050 | H-atom parameters constrained |
S = 1.00 | Δρmax = 0.58 e Å−3 |
3738 reflections | Δρmin = −1.04 e Å−3 |
191 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 | ||
I1 | 0.36407 (2) | 0.52109 (2) | 0.344025 (19) | 0.01447 (6) | |
I2 | 0.54922 (2) | 0.97175 (3) | 0.69338 (2) | 0.01683 (6) | |
Cd | 0.39702 (2) | 0.69721 (3) | 0.61836 (2) | 0.01149 (6) | |
N1 | 0.2891 (3) | 0.6752 (3) | 0.8000 (2) | 0.0118 (5) | |
N2 | 0.1161 (3) | 0.7293 (3) | 0.5962 (2) | 0.0110 (5) | |
O1 | −0.1491 (3) | 0.9351 (3) | 0.1141 (2) | 0.0162 (5) | |
O2 | −0.3079 (3) | 0.7290 (3) | 0.0766 (2) | 0.0206 (5) | |
C1 | 0.3737 (4) | 0.6588 (4) | 0.9039 (3) | 0.0153 (7) | |
H1 | 0.4858 | 0.6579 | 0.9063 | 0.018* | |
C2 | 0.3043 (4) | 0.6428 (4) | 1.0096 (3) | 0.0150 (7) | |
H2 | 0.3682 | 0.6340 | 1.0833 | 0.018* | |
C3 | 0.1418 (4) | 0.6401 (4) | 1.0051 (3) | 0.0157 (7) | |
H3 | 0.0915 | 0.6254 | 1.0741 | 0.019* | |
C4 | 0.0520 (4) | 0.6593 (4) | 0.8977 (3) | 0.0139 (7) | |
H4 | −0.0604 | 0.6582 | 0.8924 | 0.017* | |
C5 | 0.1304 (4) | 0.6800 (4) | 0.7980 (3) | 0.0123 (6) | |
C6 | 0.0422 (4) | 0.7113 (4) | 0.6870 (3) | 0.0119 (6) | |
H6 | −0.0697 | 0.7181 | 0.6826 | 0.014* | |
C7 | 0.0294 (3) | 0.7576 (4) | 0.4877 (3) | 0.0107 (6) | |
C8 | −0.1235 (4) | 0.6954 (4) | 0.4383 (3) | 0.0130 (6) | |
H8 | −0.1757 | 0.6374 | 0.4800 | 0.016* | |
C9 | −0.1987 (4) | 0.7191 (4) | 0.3279 (3) | 0.0153 (7) | |
H9 | −0.3021 | 0.6761 | 0.2933 | 0.018* | |
C10 | −0.1227 (3) | 0.8059 (4) | 0.2677 (3) | 0.0103 (6) | |
C11 | 0.0284 (3) | 0.8706 (4) | 0.3191 (3) | 0.0115 (6) | |
H11 | 0.0785 | 0.9326 | 0.2798 | 0.014* | |
C12 | 0.1058 (3) | 0.8445 (4) | 0.4279 (3) | 0.0114 (6) | |
H12 | 0.2101 | 0.8857 | 0.4613 | 0.014* | |
C13 | −0.2045 (4) | 0.8179 (4) | 0.1441 (3) | 0.0135 (7) | |
C14 | −0.2324 (4) | 0.9537 (4) | −0.0024 (3) | 0.0175 (7) | |
H14A | −0.2363 | 0.8575 | −0.0752 | 0.026* | |
H14B | −0.1767 | 1.0318 | −0.0248 | 0.026* | |
H14C | −0.3406 | 0.9843 | 0.0144 | 0.026* |
U11 | U22 | U33 | U12 | U13 | U23 | |
I1 | 0.01401 (11) | 0.01747 (12) | 0.01205 (11) | 0.00245 (8) | 0.00116 (8) | 0.00518 (9) |
I2 | 0.01733 (11) | 0.01644 (12) | 0.01742 (11) | −0.00593 (9) | −0.00164 (8) | 0.00774 (9) |
Cd | 0.01011 (11) | 0.01394 (13) | 0.01083 (12) | −0.00150 (9) | 0.00068 (9) | 0.00488 (10) |
N1 | 0.0126 (13) | 0.0116 (14) | 0.0107 (13) | −0.0020 (11) | 0.0000 (10) | 0.0034 (11) |
N2 | 0.0121 (12) | 0.0113 (14) | 0.0104 (13) | 0.0009 (11) | 0.0005 (10) | 0.0050 (11) |
O1 | 0.0210 (12) | 0.0152 (13) | 0.0131 (11) | −0.0027 (10) | −0.0055 (9) | 0.0078 (10) |
O2 | 0.0213 (12) | 0.0181 (14) | 0.0211 (13) | −0.0059 (10) | −0.0088 (10) | 0.0084 (11) |
C1 | 0.0165 (16) | 0.0139 (17) | 0.0142 (16) | −0.0020 (13) | −0.0026 (13) | 0.0043 (14) |
C2 | 0.0225 (17) | 0.0125 (17) | 0.0108 (15) | −0.0006 (13) | −0.0015 (13) | 0.0058 (14) |
C3 | 0.0226 (17) | 0.0133 (17) | 0.0139 (16) | −0.0012 (13) | 0.0035 (13) | 0.0076 (14) |
C4 | 0.0133 (15) | 0.0137 (17) | 0.0145 (16) | 0.0003 (13) | 0.0029 (12) | 0.0041 (14) |
C5 | 0.0137 (15) | 0.0115 (17) | 0.0116 (15) | −0.0002 (12) | 0.0019 (12) | 0.0037 (13) |
C6 | 0.0109 (15) | 0.0113 (16) | 0.0130 (15) | −0.0003 (12) | 0.0006 (12) | 0.0035 (13) |
C7 | 0.0117 (15) | 0.0106 (16) | 0.0086 (14) | 0.0021 (12) | −0.0001 (12) | 0.0020 (13) |
C8 | 0.0128 (15) | 0.0144 (17) | 0.0132 (15) | −0.0030 (13) | 0.0006 (12) | 0.0065 (14) |
C9 | 0.0107 (15) | 0.0173 (18) | 0.0169 (16) | −0.0026 (13) | −0.0014 (13) | 0.0052 (14) |
C10 | 0.0117 (14) | 0.0095 (16) | 0.0090 (14) | 0.0003 (12) | −0.0006 (12) | 0.0024 (13) |
C11 | 0.0123 (15) | 0.0095 (16) | 0.0127 (15) | 0.0021 (12) | 0.0040 (12) | 0.0030 (13) |
C12 | 0.0067 (14) | 0.0132 (17) | 0.0134 (15) | −0.0001 (12) | 0.0000 (12) | 0.0036 (13) |
C13 | 0.0138 (15) | 0.0134 (17) | 0.0126 (15) | 0.0019 (13) | −0.0006 (13) | 0.0040 (14) |
C14 | 0.0246 (17) | 0.0163 (18) | 0.0125 (16) | 0.0001 (14) | −0.0046 (14) | 0.0080 (14) |
I1—Cd | 2.8765 (4) | C4—C5 | 1.397 (4) |
I1—Cdi | 2.9813 (3) | C4—H4 | 0.9500 |
I2—Cd | 2.7023 (4) | C5—C6 | 1.471 (4) |
Cd—N1 | 2.333 (2) | C6—H6 | 0.9500 |
Cd—N2 | 2.402 (2) | C7—C12 | 1.394 (4) |
Cd—I1i | 2.9813 (3) | C7—C8 | 1.399 (4) |
N1—C1 | 1.332 (4) | C8—C9 | 1.388 (4) |
N1—C5 | 1.346 (4) | C8—H8 | 0.9500 |
N2—C6 | 1.280 (4) | C9—C10 | 1.396 (4) |
N2—C7 | 1.430 (4) | C9—H9 | 0.9500 |
O1—C13 | 1.342 (4) | C10—C11 | 1.395 (4) |
O1—C14 | 1.452 (4) | C10—C13 | 1.491 (4) |
O2—C13 | 1.207 (4) | C11—C12 | 1.390 (4) |
C1—C2 | 1.396 (4) | C11—H11 | 0.9500 |
C1—H1 | 0.9500 | C12—H12 | 0.9500 |
C2—C3 | 1.375 (5) | C14—H14A | 0.9800 |
C2—H2 | 0.9500 | C14—H14B | 0.9800 |
C3—C4 | 1.394 (4) | C14—H14C | 0.9800 |
C3—H3 | 0.9500 | ||
Cd—I1—Cdi | 92.716 (9) | C4—C5—C6 | 121.0 (3) |
N1—Cd—N2 | 70.33 (8) | N2—C6—C5 | 120.1 (3) |
N1—Cd—I2 | 107.66 (7) | N2—C6—H6 | 119.9 |
N2—Cd—I2 | 109.09 (6) | C5—C6—H6 | 119.9 |
N1—Cd—I1 | 134.10 (7) | C12—C7—C8 | 120.5 (3) |
N2—Cd—I1 | 87.44 (6) | C12—C7—N2 | 117.5 (3) |
I2—Cd—I1 | 117.588 (10) | C8—C7—N2 | 122.0 (3) |
N1—Cd—I1i | 86.88 (6) | C9—C8—C7 | 119.6 (3) |
N2—Cd—I1i | 141.81 (6) | C9—C8—H8 | 120.2 |
I2—Cd—I1i | 106.827 (10) | C7—C8—H8 | 120.2 |
I1—Cd—I1i | 87.284 (9) | C8—C9—C10 | 120.1 (3) |
C1—N1—C5 | 118.7 (3) | C8—C9—H9 | 119.9 |
C1—N1—Cd | 124.5 (2) | C10—C9—H9 | 119.9 |
C5—N1—Cd | 116.87 (19) | C11—C10—C9 | 120.1 (3) |
C6—N2—C7 | 119.8 (3) | C11—C10—C13 | 122.2 (3) |
C6—N2—Cd | 115.35 (19) | C9—C10—C13 | 117.6 (3) |
C7—N2—Cd | 124.74 (18) | C12—C11—C10 | 120.1 (3) |
C13—O1—C14 | 114.2 (2) | C12—C11—H11 | 120.0 |
N1—C1—C2 | 122.7 (3) | C10—C11—H11 | 120.0 |
N1—C1—H1 | 118.6 | C11—C12—C7 | 119.6 (3) |
C2—C1—H1 | 118.6 | C11—C12—H12 | 120.2 |
C3—C2—C1 | 118.8 (3) | C7—C12—H12 | 120.2 |
C3—C2—H2 | 120.6 | O2—C13—O1 | 123.6 (3) |
C1—C2—H2 | 120.6 | O2—C13—C10 | 123.2 (3) |
C2—C3—C4 | 119.0 (3) | O1—C13—C10 | 113.2 (3) |
C2—C3—H3 | 120.5 | O1—C14—H14A | 109.5 |
C4—C3—H3 | 120.5 | O1—C14—H14B | 109.5 |
C3—C4—C5 | 118.8 (3) | H14A—C14—H14B | 109.5 |
C3—C4—H4 | 120.6 | O1—C14—H14C | 109.5 |
C5—C4—H4 | 120.6 | H14A—C14—H14C | 109.5 |
N1—C5—C4 | 121.9 (3) | H14B—C14—H14C | 109.5 |
N1—C5—C6 | 117.1 (3) | ||
Cdi—I1—Cd—N1 | −83.00 (8) | Cd—N1—C5—C6 | −5.0 (4) |
Cdi—I1—Cd—N2 | −142.16 (6) | C3—C4—C5—N1 | 3.0 (5) |
Cdi—I1—Cd—I2 | 107.590 (12) | C3—C4—C5—C6 | −175.7 (3) |
Cdi—I1—Cd—I1i | 0.0 | C7—N2—C6—C5 | 179.1 (3) |
N2—Cd—N1—C1 | −175.4 (3) | Cd—N2—C6—C5 | 2.6 (4) |
I2—Cd—N1—C1 | −70.8 (3) | N1—C5—C6—N2 | 1.5 (5) |
I1—Cd—N1—C1 | 119.0 (2) | C4—C5—C6—N2 | −179.7 (3) |
I1i—Cd—N1—C1 | 35.8 (3) | C6—N2—C7—C12 | 150.0 (3) |
N2—Cd—N1—C5 | 4.5 (2) | Cd—N2—C7—C12 | −33.8 (4) |
I2—Cd—N1—C5 | 109.0 (2) | C6—N2—C7—C8 | −32.9 (5) |
I1—Cd—N1—C5 | −61.1 (2) | Cd—N2—C7—C8 | 143.3 (2) |
I1i—Cd—N1—C5 | −144.3 (2) | C12—C7—C8—C9 | 0.8 (5) |
N1—Cd—N2—C6 | −3.7 (2) | N2—C7—C8—C9 | −176.2 (3) |
I2—Cd—N2—C6 | −106.2 (2) | C7—C8—C9—C10 | −0.7 (5) |
I1—Cd—N2—C6 | 135.4 (2) | C8—C9—C10—C11 | −0.8 (5) |
I1i—Cd—N2—C6 | 53.1 (3) | C8—C9—C10—C13 | 175.7 (3) |
N1—Cd—N2—C7 | −180.0 (3) | C9—C10—C11—C12 | 2.2 (5) |
I2—Cd—N2—C7 | 77.5 (2) | C13—C10—C11—C12 | −174.0 (3) |
I1—Cd—N2—C7 | −40.9 (2) | C10—C11—C12—C7 | −2.1 (5) |
I1i—Cd—N2—C7 | −123.2 (2) | C8—C7—C12—C11 | 0.6 (5) |
C5—N1—C1—C2 | 1.5 (5) | N2—C7—C12—C11 | 177.7 (3) |
Cd—N1—C1—C2 | −178.6 (2) | C14—O1—C13—O2 | 4.4 (4) |
N1—C1—C2—C3 | 1.7 (5) | C14—O1—C13—C10 | −177.0 (2) |
C1—C2—C3—C4 | −2.5 (5) | C11—C10—C13—O2 | 156.5 (3) |
C2—C3—C4—C5 | 0.2 (5) | C9—C10—C13—O2 | −19.9 (5) |
C1—N1—C5—C4 | −3.9 (5) | C11—C10—C13—O1 | −22.1 (4) |
Cd—N1—C5—C4 | 176.3 (3) | C9—C10—C13—O1 | 161.5 (3) |
C1—N1—C5—C6 | 174.9 (3) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Cg1 is the centroid of the N1,C1–C5 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···O2ii | 0.95 | 2.34 | 3.066 (4) | 133 |
C14—H14B···Cg1iii | 0.98 | 2.79 | 3.416 (4) | 123 |
Symmetry codes: (ii) x+1, y, z+1; (iii) −x, −y+2, −z+1. |
I1—Cd | 2.8765 (4) | Cd—N1 | 2.333 (2) |
I1—Cdi | 2.9813 (3) | Cd—N2 | 2.402 (2) |
I2—Cd | 2.7023 (4) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Cg1 is the centroid of the N1,C1–C5 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···O2ii | 0.95 | 2.34 | 3.066 (4) | 133 |
C14—H14B···Cg1iii | 0.98 | 2.79 | 3.416 (4) | 123 |
Symmetry codes: (ii) x+1, y, z+1; (iii) −x, −y+2, −z+1. |
Footnotes
‡Additional correspondence author, e-mail: basubaul@hotmail.com.
Acknowledgements
The financial support of the University Grants Commission, New Delhi, India, to TSBB [F. No. 42–396/2013 (SR)] is gratefully acknowledged. The authors also thank the Ministry of Higher Education (Malaysia) and the University of Malaya for funding structural studies through the High-Impact Research scheme (UM.C/HIR-MOHE/SC/03).
References
Addison, A. W., Rao, T. N., Reedijk, J., van Rijn, J. & Verschoor, G. C. (1984). J. Chem. Soc. Dalton Trans. pp. 1349–1356. CSD CrossRef Web of Science Google Scholar
Agilent (2013). CrysAlis PRO. Agilent Technologies Inc., Santa Clara, CA, USA. Google Scholar
Basu Baul, T. S., Kundu, S., Höpfl, H., Tiekink, E. R. T. & Linden, A. (2013). Polyhedron, 55, 270–282. Web of Science CSD CrossRef CAS Google Scholar
Basu Baul, T. S., Kundu, S., Linden, A., Raviprakash, N., Manna, S. & Guedes da Silva, F. (2013). Dalton Trans. doi:10.1039/c3dt52062e. Google Scholar
Basu Baul, T. S., Kundu, S., Mitra, S., Höpfl, H., Tiekink, E. R. T. & Linden, A. (2013). Dalton Trans. 42, 1905–1920. Web of Science CSD CrossRef CAS PubMed Google Scholar
Brandenburg, K. (2006). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920–925. Web of Science CrossRef CAS IUCr Journals Google Scholar
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 title compound, (I), was investigated during the course of studies into the coordination chemistry of divalent zinc triad elements with (E)-N-(pyridin-2-ylmethylidene)arylamine ligands. These complexes were investigated primarily by X-ray crystallography and proton NMR but, also included some biological studies (Basu Baul, Kundu, Höpfl et al., 2013; Basu Baul, Kundu, Linden et al., 2013; Basu Baul, Kundu, Mitra et al. 2013).
The centrosymmetric binuclear compound, Fig. 1, features a central Cd2I2 core that approximates a square as the µ2-I atoms form almost equivalent Cd—I bond lengths, each of which is longer than the terminal Cd—I bond, Table 1. The five-coordinate environment is completed by the chelating ligand which exhibits a twist as seen in the dihedral angle between the two rings of 30.78 (17)°. The coordination geometry approximates a square pyramid as judged by the value of τ = 0.13, compared with 0.0 and 1.0 for ideal square pyramidal and trigonal bipyramidal geometries, respectfully (Addison et al., 1984). In this description, the Cd atom lies 0.9208 (1) Å above the plane defined by the two µ2-I and chelating N atoms (r.m.s. deviation = 0.0690 Å) in the direction of the terminal I atom. As observed in related systems, the Cd—(pyridyl) bond length is shorter than the Cd—N(imino) bond. The ester group is twisted out of the plane of the benzene ring to which it is connected as seen in the value of the C9—C10—C13—O1 torsion angle of 161.5 (3)°.
The crystal packing is dominated by interactions involving the pyridyl residue, Table 2. Thus, pyridyl-C—H···O(carbonyl) and methyl-H···π(pyridyl) interaction stabilize the three-dimensional architecture, Fig. 2.
The binuclear structure reported herein contrasts the mononuclear structures found for the zinc (Basu Baul, Kundu, Linden et al., 2013) and mercury (Basu Baul, Kundu, Mitra et al., 2013) analogues.