metal-organic compounds
Dibromido(6,6′-dimethyl-2,2′-bipyridine-κ2N,N′)zinc(II)
aDamghan University of Basic Sciences, School of Chemistry, Damghan, Iran, bIslamic Azad University, Shahr-e-Rey Branch, Tehran, Iran, cDepartment of Chemistry, Jame Elmi Karbordi University, Aleshtar 1 Center, Aleshtar, Lorestan, Iran, and dDepartment of Chemistry, Islamic Azad University, Kazerun Branch, Kazerun, Fars, Iran
*Correspondence e-mail: robabeh_alizadeh@yahoo.com
In the title compound, [ZnBr2(C12H12N2)], the ZnII atom is four-coordinated in a distorted tetrahedral arrangement by an N,N′-bidentate 6,6′-dimethyl-2,2′-bipyridine ligand and two bromide ions. In the crystal, there are aromatic π–π contacts between the pyridine rings [centroid–centroid distances = 3.818 (3) and 3.728 (4) Å].
Related literature
For related crystal structures containing a Zn atom coordinated by an N,N-bidentate bipyridine or phenanthroline-type ligand and two halide ions, see: Ahmadi et al. (2008, 2009); Alizadeh, Heidari, et al. (2009); Alizadeh, Kalateh, et al. (2009); Blake et al. (2007); Khalighi et al. (2008); Khan & Tuck (1984); Khavasi et al. (2008); Khoshtarkib et al. (2009); Lee et al. (2007); Marjani et al. (2009); Reimann et al. (1966); Wriedt et al. (2008).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1998); cell SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S1600536809039610/hb5122sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809039610/hb5122Isup2.hkl
A solution of 6,6'-dimethyl-2,2'-bipyridine (0.20 g, 1.10 mmol) in methanol (10 ml) was added to a solution of ZnBr2 (0.25 g, 1.10 mmol) in acetonitrile (10 ml) and the resulting colourless solution was stirred for 20 min at at 313 K. This solution was left to evaporate slowly at room temperature. After one week, colorless prisms of (I) were isolated (yield 0.33 g, 73.7%).
All H atoms were positioned geometrically, with C—H = 0.93–0.96Å and refined as riding with Uiso(H) = 1.2Ueq(C) or 1.5Ueq(methyl C).
Recently, we reported the synthes and
of [ZnCl2(phend)], (II), (Khoshtarkib et al., 2009), [HgBr2(2,9-dmphen)], (III), (Alizadeh, Heidari et al., 2009) and [Pb4(NO3)8(6-mbpy)4], (IV), (Ahmadi, Kalateh, Alizadeh et al., 2009) [where phend is phenanthridine, 2,9-dmphen is 2,9-dimethyl-1,10-phenanthroline and 6-mbpy is 6-methyl-2,2'-bipyridine].There are several ZnII complexes, with formula, [ZnX2(N—N)], (X = Cl and Br), such as [ZnCl2(bipy)], (V), (Khan & Tuck, 1984), [ZnCl2(phen)], (VI), (Reimann et al., 1966), [ZnCl2(dm4bt)], (VII), (Khavasi et al., 2008), [ZnCl2(5,5'-dmbpy)], (VIII), (khalighi et al., 2008), [ZnCl2(6-mbpy)], (IX), (Ahmadi, Kalateh, Ebadi et al., 2008), [ZnCl2(6,6'-dmbpy)], (X), (Alizadeh, Kalateh et al., 2009), [ZnCl2(PBD)]}, (XI), (Marjani et al., 2009), [ZnBr2(4,4'-(dtbpy)].(Et2O), (XII), (Blake et al., 2007), {ZnBr2[NH(py)2]},(XIII), (Lee et al., 2007) and {ZnBr2[S(py)2]}, (XIV) (Wriedt et al., 2008) [where bipy is 2,2'-bipyridine, phen is 1,10-phenanthroline, dm4bt is 2,2'-dimethyl-4,4'-bithiazole, 5,5'-dmbpy is 5,5'-dimethyl-2,2'-bipyridine, 6,6'-dmbpy is 6,6'-dimethyl-2,2'-bipyridine, PBD is N-(pyridin-2-ylmethylene)benzene-1,4-diamine, dtbpy is 4,4'-di-tert-butyl-2,2'-bipyridine, NH(py)2 is bis(2-pyridyl)amine and S(py)2 is bis(2-pyridyl)sulfide] have been synthesized and characterized by single-crystal X-ray diffraction methods. We report herein the synthesis and
of the title compound (I).In the molecule of the title compound, (I), (Fig. 1), the ZnII atom is four-coordinated in distorted tetrahedral configurations by two N atoms from one 6,6'-dimethyl-2,2'-bipyridine and two terminal Br atoms. The Zn—Br and Zn—N bond lengths and angles are collected in Table 1.
The π-π contacts between the pyridine rings, Cg1···Cg3i and Cg2···Cg3ii [symmetry cods: (i) 1-X,2-Y,-Z, (ii) –X,2-Y,-Z, where Cg1, Cg2 and Cg3 are centroids of the rings (Zn1/N1/C6—C7/N2), (N1/C2—C6) and (N2/C7—C11), respectively] further stabilize the structure, with centroid-centroid distance of 3.818 (3) and 3.728 (4) Å, respectively. It seems this π-π stacking is effective in the stabilization of the (Fig. 2).
For related crystal structures containing a Zn atom coordinated by an N,N-bidentate bipy or phen-type ligand and two halide ions, see: Ahmadi et al. (2008, 2009); Alizadeh, Heidari, et al. (2009); Alizadeh, Kalateh, et al. (2009); Blake et al. (2007); Khalighi et al. (2008); Khan & Tuck (1984); Khavasi et al. (2008); Khoshtarkib et al. (2009); Lee et al. (2007); Marjani et al. (2009); Reimann et al. (1966); Wriedt et al. (2008).
Data collection: SMART (Bruker, 1998); cell
SAINT (Bruker, 1998); data reduction: SAINT (Bruker, 1998); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).Fig. 1. The molecular structure of (I) with displacement ellipsoids drawn at the 30% probability level. | |
Fig. 2. Unit-cell packing diagram for (I). |
[ZnBr2(C12H12N2)] | F(000) = 792 |
Mr = 409.43 | Dx = 1.929 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1342 reflections |
a = 7.6506 (15) Å | θ = 2.3–29.3° |
b = 10.279 (2) Å | µ = 7.39 mm−1 |
c = 18.023 (4) Å | T = 298 K |
β = 95.93 (3)° | Prism, colourless |
V = 1409.8 (5) Å3 | 0.17 × 0.16 × 0.12 mm |
Z = 4 |
Bruker SMART CCD area-detector diffractometer | 3822 independent reflections |
Radiation source: fine-focus sealed tube | 2717 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.068 |
φ and ω scans | θmax = 29.3°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | h = −9→10 |
Tmin = 0.300, Tmax = 0.418 | k = −14→14 |
11390 measured reflections | l = −24→24 |
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)] = 0.058 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.126 | H-atom parameters constrained |
S = 1.11 | w = 1/[σ2(Fo2) + (0.0419P)2 + 2.306P] where P = (Fo2 + 2Fc2)/3 |
3822 reflections | (Δ/σ)max < 0.001 |
154 parameters | Δρmax = 0.81 e Å−3 |
0 restraints | Δρmin = −0.68 e Å−3 |
[ZnBr2(C12H12N2)] | V = 1409.8 (5) Å3 |
Mr = 409.43 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.6506 (15) Å | µ = 7.39 mm−1 |
b = 10.279 (2) Å | T = 298 K |
c = 18.023 (4) Å | 0.17 × 0.16 × 0.12 mm |
β = 95.93 (3)° |
Bruker SMART CCD area-detector diffractometer | 3822 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | 2717 reflections with I > 2σ(I) |
Tmin = 0.300, Tmax = 0.418 | Rint = 0.068 |
11390 measured reflections |
R[F2 > 2σ(F2)] = 0.058 | 0 restraints |
wR(F2) = 0.126 | H-atom parameters constrained |
S = 1.11 | Δρmax = 0.81 e Å−3 |
3822 reflections | Δρmin = −0.68 e Å−3 |
154 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 | ||
C1 | 0.1523 (12) | 0.9316 (8) | 0.2403 (4) | 0.077 (2) | |
H1A | 0.2661 | 0.8940 | 0.2538 | 0.092* | |
H1B | 0.0679 | 0.8635 | 0.2288 | 0.092* | |
H1C | 0.1185 | 0.9824 | 0.2812 | 0.092* | |
C2 | 0.1591 (7) | 1.0167 (6) | 0.1736 (3) | 0.0486 (13) | |
C3 | 0.1234 (9) | 1.1474 (7) | 0.1764 (4) | 0.0614 (16) | |
H3 | 0.0946 | 1.1851 | 0.2204 | 0.074* | |
C4 | 0.1306 (9) | 1.2221 (6) | 0.1134 (4) | 0.0654 (18) | |
H4 | 0.1055 | 1.3105 | 0.1144 | 0.078* | |
C5 | 0.1755 (8) | 1.1645 (6) | 0.0485 (4) | 0.0578 (15) | |
H5 | 0.1801 | 1.2138 | 0.0054 | 0.069* | |
C6 | 0.2132 (7) | 1.0330 (5) | 0.0485 (3) | 0.0425 (11) | |
C7 | 0.2666 (6) | 0.9633 (5) | −0.0177 (3) | 0.0388 (11) | |
C8 | 0.2796 (8) | 1.0242 (6) | −0.0855 (3) | 0.0535 (14) | |
H8 | 0.2510 | 1.1117 | −0.0919 | 0.064* | |
C9 | 0.3356 (9) | 0.9530 (8) | −0.1428 (4) | 0.0668 (19) | |
H9 | 0.3455 | 0.9926 | −0.1886 | 0.080* | |
C10 | 0.3770 (8) | 0.8238 (8) | −0.1333 (3) | 0.0581 (16) | |
H10 | 0.4156 | 0.7754 | −0.1720 | 0.070* | |
C11 | 0.3597 (8) | 0.7663 (6) | −0.0638 (3) | 0.0490 (13) | |
C12 | 0.3987 (12) | 0.6258 (7) | −0.0493 (4) | 0.074 (2) | |
H12A | 0.2942 | 0.5824 | −0.0371 | 0.089* | |
H12B | 0.4889 | 0.6177 | −0.0084 | 0.089* | |
H12C | 0.4380 | 0.5868 | −0.0930 | 0.089* | |
N1 | 0.2039 (6) | 0.9612 (4) | 0.1102 (2) | 0.0394 (9) | |
N2 | 0.3051 (6) | 0.8366 (4) | −0.0080 (2) | 0.0390 (9) | |
Zn1 | 0.26913 (8) | 0.76759 (6) | 0.09736 (3) | 0.04134 (17) | |
Br1 | 0.03105 (10) | 0.62512 (7) | 0.10150 (4) | 0.0682 (2) | |
Br2 | 0.52344 (8) | 0.69964 (7) | 0.17038 (3) | 0.05791 (19) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.119 (6) | 0.070 (5) | 0.045 (3) | 0.017 (5) | 0.023 (4) | −0.006 (3) |
C2 | 0.048 (3) | 0.047 (3) | 0.051 (3) | 0.006 (2) | 0.007 (2) | −0.010 (2) |
C3 | 0.064 (4) | 0.052 (4) | 0.067 (4) | 0.014 (3) | 0.002 (3) | −0.018 (3) |
C4 | 0.071 (4) | 0.036 (3) | 0.085 (5) | 0.012 (3) | −0.009 (4) | −0.013 (3) |
C5 | 0.058 (3) | 0.041 (3) | 0.070 (4) | 0.004 (3) | −0.014 (3) | 0.015 (3) |
C6 | 0.039 (3) | 0.034 (3) | 0.053 (3) | 0.000 (2) | −0.003 (2) | 0.004 (2) |
C7 | 0.036 (2) | 0.038 (3) | 0.042 (3) | −0.004 (2) | −0.001 (2) | 0.009 (2) |
C8 | 0.057 (3) | 0.054 (3) | 0.048 (3) | −0.005 (3) | −0.001 (3) | 0.017 (3) |
C9 | 0.074 (4) | 0.083 (5) | 0.044 (3) | −0.013 (4) | 0.008 (3) | 0.020 (3) |
C10 | 0.055 (3) | 0.083 (5) | 0.036 (3) | −0.003 (3) | 0.005 (2) | −0.001 (3) |
C11 | 0.055 (3) | 0.056 (3) | 0.036 (3) | −0.005 (3) | 0.006 (2) | −0.002 (2) |
C12 | 0.117 (6) | 0.054 (4) | 0.052 (4) | 0.022 (4) | 0.017 (4) | −0.006 (3) |
N1 | 0.043 (2) | 0.035 (2) | 0.040 (2) | 0.0048 (17) | 0.0054 (18) | 0.0015 (17) |
N2 | 0.047 (2) | 0.039 (2) | 0.0310 (19) | −0.0009 (18) | 0.0045 (17) | 0.0043 (17) |
Zn1 | 0.0537 (4) | 0.0344 (3) | 0.0365 (3) | 0.0041 (3) | 0.0078 (2) | 0.0059 (2) |
Br1 | 0.0718 (4) | 0.0582 (4) | 0.0742 (4) | −0.0162 (3) | 0.0053 (3) | 0.0207 (3) |
Br2 | 0.0605 (4) | 0.0634 (4) | 0.0489 (3) | 0.0125 (3) | 0.0017 (3) | 0.0138 (3) |
C1—C2 | 1.492 (9) | C8—C9 | 1.370 (10) |
C1—H1A | 0.9600 | C8—H8 | 0.9300 |
C1—H1B | 0.9600 | C9—C10 | 1.372 (11) |
C1—H1C | 0.9600 | C9—H9 | 0.9300 |
C2—N1 | 1.352 (7) | C10—C11 | 1.403 (8) |
C2—C3 | 1.373 (8) | C10—H10 | 0.9300 |
C3—C4 | 1.376 (10) | C11—N2 | 1.340 (7) |
C3—H3 | 0.9300 | C11—C12 | 1.492 (9) |
C4—C5 | 1.386 (10) | C12—H12A | 0.9600 |
C4—H4 | 0.9300 | C12—H12B | 0.9600 |
C5—C6 | 1.383 (8) | C12—H12C | 0.9600 |
C5—H5 | 0.9300 | Zn1—N1 | 2.071 (4) |
C6—N1 | 1.342 (7) | Zn1—N2 | 2.072 (4) |
C6—C7 | 1.486 (8) | Zn1—Br2 | 2.3400 (11) |
C7—N2 | 1.343 (7) | Zn1—Br1 | 2.3444 (10) |
C7—C8 | 1.384 (7) | ||
C2—C1—H1A | 109.5 | C8—C9—C10 | 120.6 (6) |
C2—C1—H1B | 109.5 | C8—C9—H9 | 119.7 |
H1A—C1—H1B | 109.5 | C10—C9—H9 | 119.7 |
C2—C1—H1C | 109.5 | C9—C10—C11 | 118.5 (6) |
H1A—C1—H1C | 109.5 | C9—C10—H10 | 120.7 |
H1B—C1—H1C | 109.5 | C11—C10—H10 | 120.7 |
N1—C2—C3 | 120.8 (6) | N2—C11—C10 | 120.5 (6) |
N1—C2—C1 | 117.8 (5) | N2—C11—C12 | 117.5 (5) |
C3—C2—C1 | 121.4 (6) | C10—C11—C12 | 121.9 (6) |
C2—C3—C4 | 119.4 (6) | C11—C12—H12A | 109.5 |
C2—C3—H3 | 120.3 | C11—C12—H12B | 109.5 |
C4—C3—H3 | 120.3 | H12A—C12—H12B | 109.5 |
C3—C4—C5 | 119.5 (6) | C11—C12—H12C | 109.5 |
C3—C4—H4 | 120.2 | H12A—C12—H12C | 109.5 |
C5—C4—H4 | 120.2 | H12B—C12—H12C | 109.5 |
C6—C5—C4 | 119.1 (6) | C6—N1—C2 | 120.5 (5) |
C6—C5—H5 | 120.4 | C6—N1—Zn1 | 113.7 (3) |
C4—C5—H5 | 120.4 | C2—N1—Zn1 | 125.8 (4) |
N1—C6—C5 | 120.6 (5) | C11—N2—C7 | 120.4 (4) |
N1—C6—C7 | 116.3 (4) | C11—N2—Zn1 | 125.8 (4) |
C5—C6—C7 | 123.1 (5) | C7—N2—Zn1 | 113.8 (3) |
N2—C7—C8 | 121.2 (5) | N1—Zn1—N2 | 80.22 (17) |
N2—C7—C6 | 116.0 (4) | N1—Zn1—Br2 | 114.82 (13) |
C8—C7—C6 | 122.8 (5) | N2—Zn1—Br2 | 115.86 (12) |
C9—C8—C7 | 118.7 (6) | N1—Zn1—Br1 | 113.58 (12) |
C9—C8—H8 | 120.7 | N2—Zn1—Br1 | 114.84 (13) |
C7—C8—H8 | 120.7 | Br2—Zn1—Br1 | 113.53 (4) |
N1—C2—C3—C4 | 1.1 (10) | C3—C2—N1—Zn1 | 178.0 (5) |
C1—C2—C3—C4 | −179.7 (7) | C1—C2—N1—Zn1 | −1.2 (8) |
C2—C3—C4—C5 | −0.7 (10) | C10—C11—N2—C7 | −0.2 (8) |
C3—C4—C5—C6 | −0.4 (10) | C12—C11—N2—C7 | −179.5 (6) |
C4—C5—C6—N1 | 1.0 (9) | C10—C11—N2—Zn1 | 179.2 (4) |
C4—C5—C6—C7 | −178.5 (5) | C12—C11—N2—Zn1 | −0.1 (8) |
N1—C6—C7—N2 | −2.0 (7) | C8—C7—N2—C11 | 0.9 (8) |
C5—C6—C7—N2 | 177.6 (5) | C6—C7—N2—C11 | −178.0 (5) |
N1—C6—C7—C8 | 179.2 (5) | C8—C7—N2—Zn1 | −178.5 (4) |
C5—C6—C7—C8 | −1.3 (8) | C6—C7—N2—Zn1 | 2.6 (6) |
N2—C7—C8—C9 | −1.0 (9) | C6—N1—Zn1—N2 | 0.8 (4) |
C6—C7—C8—C9 | 177.9 (6) | C2—N1—Zn1—N2 | −177.8 (5) |
C7—C8—C9—C10 | 0.3 (10) | C6—N1—Zn1—Br2 | 114.9 (3) |
C8—C9—C10—C11 | 0.4 (10) | C2—N1—Zn1—Br2 | −63.7 (5) |
C9—C10—C11—N2 | −0.5 (9) | C6—N1—Zn1—Br1 | −112.2 (3) |
C9—C10—C11—C12 | 178.8 (7) | C2—N1—Zn1—Br1 | 69.3 (5) |
C5—C6—N1—C2 | −0.6 (8) | C11—N2—Zn1—N1 | 178.7 (5) |
C7—C6—N1—C2 | 179.0 (5) | C7—N2—Zn1—N1 | −1.9 (4) |
C5—C6—N1—Zn1 | −179.3 (4) | C11—N2—Zn1—Br2 | 65.8 (5) |
C7—C6—N1—Zn1 | 0.3 (6) | C7—N2—Zn1—Br2 | −114.8 (3) |
C3—C2—N1—C6 | −0.4 (9) | C11—N2—Zn1—Br1 | −69.7 (5) |
C1—C2—N1—C6 | −179.7 (6) | C7—N2—Zn1—Br1 | 109.7 (3) |
Experimental details
Crystal data | |
Chemical formula | [ZnBr2(C12H12N2)] |
Mr | 409.43 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 7.6506 (15), 10.279 (2), 18.023 (4) |
β (°) | 95.93 (3) |
V (Å3) | 1409.8 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 7.39 |
Crystal size (mm) | 0.17 × 0.16 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 1998) |
Tmin, Tmax | 0.300, 0.418 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11390, 3822, 2717 |
Rint | 0.068 |
(sin θ/λ)max (Å−1) | 0.688 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.058, 0.126, 1.11 |
No. of reflections | 3822 |
No. of parameters | 154 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.81, −0.68 |
Computer programs: SMART (Bruker, 1998), SAINT (Bruker, 1998), SHELXTL (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), WinGX (Farrugia, 1999).
Zn1—N1 | 2.071 (4) | Zn1—Br2 | 2.3400 (11) |
Zn1—N2 | 2.072 (4) | Zn1—Br1 | 2.3444 (10) |
N1—Zn1—N2 | 80.22 (17) |
Acknowledgements
We are grateful to Damghan University of Basic Sciences and the Islamic Azad University, Shahr-e-Rey Branch, for financial support.
References
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Recently, we reported the synthes and crystal structure of [ZnCl2(phend)], (II), (Khoshtarkib et al., 2009), [HgBr2(2,9-dmphen)], (III), (Alizadeh, Heidari et al., 2009) and [Pb4(NO3)8(6-mbpy)4], (IV), (Ahmadi, Kalateh, Alizadeh et al., 2009) [where phend is phenanthridine, 2,9-dmphen is 2,9-dimethyl-1,10-phenanthroline and 6-mbpy is 6-methyl-2,2'-bipyridine].
There are several ZnII complexes, with formula, [ZnX2(N—N)], (X = Cl and Br), such as [ZnCl2(bipy)], (V), (Khan & Tuck, 1984), [ZnCl2(phen)], (VI), (Reimann et al., 1966), [ZnCl2(dm4bt)], (VII), (Khavasi et al., 2008), [ZnCl2(5,5'-dmbpy)], (VIII), (khalighi et al., 2008), [ZnCl2(6-mbpy)], (IX), (Ahmadi, Kalateh, Ebadi et al., 2008), [ZnCl2(6,6'-dmbpy)], (X), (Alizadeh, Kalateh et al., 2009), [ZnCl2(PBD)]}, (XI), (Marjani et al., 2009), [ZnBr2(4,4'-(dtbpy)].(Et2O), (XII), (Blake et al., 2007), {ZnBr2[NH(py)2]},(XIII), (Lee et al., 2007) and {ZnBr2[S(py)2]}, (XIV) (Wriedt et al., 2008) [where bipy is 2,2'-bipyridine, phen is 1,10-phenanthroline, dm4bt is 2,2'-dimethyl-4,4'-bithiazole, 5,5'-dmbpy is 5,5'-dimethyl-2,2'-bipyridine, 6,6'-dmbpy is 6,6'-dimethyl-2,2'-bipyridine, PBD is N-(pyridin-2-ylmethylene)benzene-1,4-diamine, dtbpy is 4,4'-di-tert-butyl-2,2'-bipyridine, NH(py)2 is bis(2-pyridyl)amine and S(py)2 is bis(2-pyridyl)sulfide] have been synthesized and characterized by single-crystal X-ray diffraction methods. We report herein the synthesis and crystal structure of the title compound (I).
In the molecule of the title compound, (I), (Fig. 1), the ZnII atom is four-coordinated in distorted tetrahedral configurations by two N atoms from one 6,6'-dimethyl-2,2'-bipyridine and two terminal Br atoms. The Zn—Br and Zn—N bond lengths and angles are collected in Table 1.
The π-π contacts between the pyridine rings, Cg1···Cg3i and Cg2···Cg3ii [symmetry cods: (i) 1-X,2-Y,-Z, (ii) –X,2-Y,-Z, where Cg1, Cg2 and Cg3 are centroids of the rings (Zn1/N1/C6—C7/N2), (N1/C2—C6) and (N2/C7—C11), respectively] further stabilize the structure, with centroid-centroid distance of 3.818 (3) and 3.728 (4) Å, respectively. It seems this π-π stacking is effective in the stabilization of the crystal structure (Fig. 2).