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Acta Cryst. (2012). E68, m1460    [ doi:10.1107/S1600536812045230 ]

Dibromido(6-methyl-2,2'-bipyridine-[kappa]2N,N')cobalt(II)

S. A. Shirvan, S. Haydari Dezfuli, F. Khazali and A. Borsalani

Abstract top

In the molecule of the title compound, [CoBr2(C11H10N2)], the CoII atom is four-coordinated in a distorted tetrahedral geometry by two N atoms from a chelating 6-methyl-2,2'-bipyridine ligand and two terminal Br atoms. In the crystal, [pi]-[pi] stacking interactions between the pyridine rings along the a-axis direction [centroid-centroid distance = 3.761 (7) Å] and C-H...Br hydrogen bonds in the bc plane together generate the three-dimensional packing.

Comment top

Recently, we reported the synthesis and crystal structure of [In(6-mbipy)Cl3(DMSO)], (II) (Shirvan et al., 2012) and [Cd(6-mbipy)Br2(DMSO)], (III) (Shirvan & Haydari Dezfuli, 2012) (6-mbipy = 6-methyl-2,2'-bipyridine, DMSO = dimethyl sulfoxide). 6-Methyl-2,2'-bipyridine is a good ligand and a few complexes with 6-mbipy have been prepared, such as that of [Hg(6-mbipy)Cl2], (IV) (Ahmadi et al., 2008a), [Pt(6-mbipy)Cl4], (V) (Amani et al., 2009), [Pb4(NO3)8(6-mbipy)4], (VI) (Ahmadi et al., 2009), [Zn(6-mbipy)Br2], (VII) (Kalateh et al., 2010), [Zn(6-mbipy)Cl2], (VIII) (Ahmadi et al., 2008b), [Pd(6-mbipy)Cl2], (IX) (Newkome et al., 1982) and [Ru(6-mbipy)3][BF4]2, (X) (Onggo et al., 2005). We report herein the synthesis and crystal structure of the title compound, (I).

In the title compound (Fig. 1), the CoII atom is four-coordinated in a distorted tetrahedral geometry by two N atoms from a chelating 6-mbipy ligand and two terminal Br atoms (Table 1). In the crystal, intermolecular C—H···Br hydrogen bonds and π–π contacts (Table 2, Fig. 2) between the pyridine rings, Cg2···Cg3i [symmetry code: (i) 1-x, 1-y, -z, Cg2 and Cg3 are the centroids of the rings N1/C2–C6 and N2/C7–C11, respectively], with a centroid–centroid distance of 3.761 (7) Å, stabilize the structure.

Related literature top

For related structures, see: Ahmadi et al. (2008a,b, 2009); Amani et al. (2009); Kalateh et al. (2010); Newkome et al. (1982); Onggo et al. (2005); Shirvan et al. (2012); Shirvan & Haydari Dezfuli (2012).

Experimental top

For the preparation of the title compound, a solution of 6-mbipy (0.28 g, 0.26 ml, 1.65 mmol) in acetonitrile (10 ml) was added to a solution of CoBr2 (0.36 g, 1.65 mmol) in acetonitrile (10 ml) and the resulting blue solution was stirred for 20 min at 313 K. This solution was left to evaporate slowly at room temperature. After one week, blue needle crystals of the title compound were isolated (yield: 0.47 g, 73.2%).

Refinement top

All H atoms were positioned geometrically and refined as riding atoms, with C—H = 0.93 (CH) and 0.96 (CH3) Å and with Uiso(H) = 1.2Ueq(C). The highest residual electron density was found 0.96 Å from Br1 the deepest hole 0.79 Å from Br1.

Computing details top

Data collection: APEX2 (Bruker, 2007); cell refinement: 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: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title compound. Displacement ellipsoids are drawn at the 30% probability level.
[Figure 2] Fig. 2. Crystal packing diagram for the title compound. Hydrogen bonds are shown as dashed lines.
Dibromido(6-methyl-2,2'-bipyridine-κ2N,N')cobalt(II) top
Crystal data top
[CoBr2(C11H10N2)]F(000) = 748
Mr = 388.94Dx = 2.000 Mg m−3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 6393 reflections
a = 7.5541 (7) Åθ = 3.1–26.0°
b = 9.7249 (7) ŵ = 7.49 mm−1
c = 17.7352 (16) ÅT = 173 K
β = 97.392 (7)°Needle, blue
V = 1292.05 (19) Å30.45 × 0.13 × 0.10 mm
Z = 4
Data collection top
Bruker APEXII CCD
diffractometer		2519 independent reflections
Radiation source: fine-focus sealed tube1546 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.099
φ and ω scansθmax = 26.0°, θmin = 3.1°
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		h = −7→9
Tmin = 0.379, Tmax = 0.512k = −10→11
6393 measured reflectionsl = −21→21
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)] = 0.085Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.164H-atom parameters constrained
S = 1.05 w = 1/[σ2(Fo2) + (0.0569P)2 + 5.329P]
where P = (Fo2 + 2Fc2)/3
2519 reflections(Δ/σ)max = 0.002
145 parametersΔρmax = 2.16 e Å−3
0 restraintsΔρmin = −1.13 e Å−3
Crystal data top
[CoBr2(C11H10N2)]V = 1292.05 (19) Å3
Mr = 388.94Z = 4
Monoclinic, P21/nMo Kα radiation
a = 7.5541 (7) ŵ = 7.49 mm−1
b = 9.7249 (7) ÅT = 173 K
c = 17.7352 (16) Å0.45 × 0.13 × 0.10 mm
β = 97.392 (7)°
Data collection top
Bruker APEXII CCD
diffractometer		2519 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		1546 reflections with I > 2σ(I)
Tmin = 0.379, Tmax = 0.512Rint = 0.099
6393 measured reflectionsθmax = 26.0°
Refinement top
R[F2 > 2σ(F2)] = 0.085H-atom parameters constrained
wR(F2) = 0.164Δρmax = 2.16 e Å−3
S = 1.05Δρmin = −1.13 e Å−3
2519 reflectionsAbsolute structure: ?
145 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
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
C30.1467 (17)0.3377 (14)0.1282 (7)0.046 (3)
H30.11260.28320.16690.056*
C40.1737 (16)0.2801 (14)0.0583 (7)0.046 (3)
H40.15880.18610.05010.055*
Br10.04264 (18)0.91295 (15)0.11995 (7)0.0501 (4)
N20.2940 (12)0.7342 (12)−0.0213 (5)0.042 (3)
C60.2426 (15)0.5016 (13)0.0149 (6)0.034 (3)
C70.2897 (14)0.6000 (13)−0.0435 (6)0.034 (3)
C80.3225 (16)0.5617 (15)−0.1157 (6)0.045 (3)
H80.31900.4698−0.13030.054*
C90.3607 (16)0.6643 (16)−0.1658 (6)0.045 (4)
H90.38650.6417−0.21420.055*
C100.3601 (18)0.7992 (16)−0.1431 (6)0.049 (4)
H100.37980.8692−0.17680.059*
N10.2173 (12)0.5578 (10)0.0835 (5)0.031 (2)
C110.3303 (17)0.8297 (15)−0.0711 (6)0.043 (3)
H110.33560.9212−0.05580.052*
Br20.54925 (17)0.79979 (15)0.16326 (7)0.0467 (4)
Co10.2680 (2)0.76329 (17)0.09004 (8)0.0345 (4)
C50.2222 (17)0.3629 (13)0.0021 (6)0.040 (3)
H50.24140.3255−0.04440.047*
C20.1726 (16)0.4806 (14)0.1384 (7)0.041 (3)
C10.144 (2)0.5546 (17)0.2094 (7)0.070 (5)
H1A0.22130.51710.25160.084*
H1B0.02180.54390.21830.084*
H1C0.16970.65050.20420.084*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C30.033 (7)0.049 (9)0.057 (7)0.002 (7)0.002 (6)0.001 (6)
C40.036 (7)0.036 (8)0.061 (8)0.007 (6)−0.010 (6)−0.022 (6)
Br10.0389 (8)0.0543 (10)0.0579 (8)0.0073 (7)0.0089 (6)−0.0186 (6)
N20.023 (5)0.072 (8)0.029 (5)0.002 (5)0.002 (4)−0.013 (5)
C60.020 (6)0.042 (7)0.038 (6)0.008 (6)−0.002 (4)−0.013 (5)
C70.020 (6)0.047 (8)0.033 (6)0.007 (6)0.002 (4)−0.009 (5)
C80.034 (7)0.062 (9)0.037 (6)0.010 (7)−0.002 (5)−0.026 (6)
C90.025 (6)0.077 (11)0.035 (6)0.010 (7)0.005 (5)−0.005 (6)
C100.053 (9)0.060 (10)0.035 (6)0.019 (8)0.005 (6)−0.003 (6)
N10.021 (5)0.034 (6)0.039 (5)−0.002 (4)0.010 (4)−0.007 (4)
C110.046 (8)0.047 (9)0.038 (6)−0.012 (7)0.011 (5)−0.001 (6)
Br20.0342 (7)0.0557 (9)0.0488 (7)0.0003 (7)−0.0004 (5)−0.0266 (6)
Co10.0306 (9)0.0390 (11)0.0347 (8)−0.0018 (8)0.0070 (6)−0.0138 (7)
C50.042 (8)0.034 (7)0.042 (6)0.001 (6)0.002 (5)−0.006 (6)
C20.026 (7)0.046 (8)0.049 (7)−0.005 (6)−0.001 (5)−0.005 (6)
C10.095 (13)0.077 (12)0.040 (7)−0.029 (10)0.014 (7)−0.001 (7)
Geometric parameters (Å, º) top
Co1—Br12.352 (2)C7—C81.386 (14)
Co1—Br22.3698 (19)C8—C91.391 (19)
Co1—N12.035 (10)C8—H80.9300
Co1—N22.029 (8)C9—C101.372 (19)
C3—C41.399 (17)C9—H90.9300
C3—C21.411 (18)C10—C111.357 (16)
C3—H30.9300C10—H100.9300
C4—C51.366 (18)N1—C21.309 (15)
C4—H40.9300C11—H110.9300
N2—C111.334 (16)C5—H50.9300
N2—C71.362 (16)C2—C11.491 (18)
C6—N11.369 (13)C1—H1A0.9600
C6—C51.373 (17)C1—H1B0.9600
C6—C71.487 (17)C1—H1C0.9600
C4—C3—C2118.3 (13)C2—N1—C6120.7 (11)
C4—C3—H3120.8C2—N1—Co1125.8 (8)
C2—C3—H3120.8C6—N1—Co1113.3 (8)
C5—C4—C3119.5 (13)N2—C11—C10123.0 (13)
C5—C4—H4120.2N2—C11—H11118.5
C3—C4—H4120.2C10—C11—H11118.5
C11—N2—C7118.3 (10)N2—Co1—N181.3 (4)
C11—N2—Co1127.0 (9)N2—Co1—Br1118.0 (3)
C7—N2—Co1114.4 (8)N1—Co1—Br1119.0 (3)
N1—C6—C5120.9 (11)N2—Co1—Br2111.2 (3)
N1—C6—C7115.8 (10)N1—Co1—Br2109.1 (3)
C5—C6—C7123.3 (10)Br1—Co1—Br2114.06 (7)
N2—C7—C8121.6 (12)C4—C5—C6119.6 (11)
N2—C7—C6114.5 (9)C4—C5—H5120.2
C8—C7—C6123.9 (12)C6—C5—H5120.2
C7—C8—C9118.3 (13)N1—C2—C3120.9 (11)
C7—C8—H8120.9N1—C2—C1115.6 (12)
C9—C8—H8120.9C3—C2—C1123.4 (12)
C10—C9—C8119.3 (11)C2—C1—H1A109.5
C10—C9—H9120.3C2—C1—H1B109.5
C8—C9—H9120.3H1A—C1—H1B109.5
C11—C10—C9119.5 (13)C2—C1—H1C109.5
C11—C10—H10120.3H1A—C1—H1C109.5
C9—C10—H10120.3H1B—C1—H1C109.5
C2—C3—C4—C5−0.6 (18)C7—N2—Co1—N1−7.8 (8)
C11—N2—C7—C80.2 (16)C11—N2—Co1—Br160.6 (11)
Co1—N2—C7—C8−173.8 (8)C7—N2—Co1—Br1−126.1 (7)
C11—N2—C7—C6−178.2 (10)C11—N2—Co1—Br2−74.0 (10)
Co1—N2—C7—C67.8 (12)C7—N2—Co1—Br299.4 (7)
N1—C6—C7—N2−2.6 (14)C2—N1—Co1—N2−176.7 (10)
C5—C6—C7—N2176.5 (11)C6—N1—Co1—N26.3 (7)
N1—C6—C7—C8179.1 (10)C2—N1—Co1—Br1−59.5 (10)
C5—C6—C7—C8−1.8 (18)C6—N1—Co1—Br1123.5 (7)
N2—C7—C8—C90.1 (17)C2—N1—Co1—Br273.7 (9)
C6—C7—C8—C9178.3 (11)C6—N1—Co1—Br2−103.3 (7)
C7—C8—C9—C10−1.7 (18)C3—C4—C5—C6−0.5 (18)
C8—C9—C10—C113.1 (19)N1—C6—C5—C40.9 (18)
C5—C6—N1—C2−0.2 (16)C7—C6—C5—C4−178.1 (10)
C7—C6—N1—C2178.9 (10)C6—N1—C2—C3−0.9 (17)
C5—C6—N1—Co1177.0 (9)Co1—N1—C2—C3−177.7 (9)
C7—C6—N1—Co1−3.9 (11)C6—N1—C2—C1−178.3 (11)
C7—N2—C11—C101.2 (18)Co1—N1—C2—C14.9 (15)
Co1—N2—C11—C10174.3 (10)C4—C3—C2—N11.3 (18)
C9—C10—C11—N2−3 (2)C4—C3—C2—C1178.5 (13)
C11—N2—Co1—N1178.8 (11)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C1—H1A···Br1i0.962.893.849 (14)178
C8—H8···Br2ii0.932.893.771 (14)158
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1, −y+1, −z.
Selected bond lengths (Å) top
Co1—Br12.352 (2)Co1—N12.035 (10)
Co1—Br22.3698 (19)Co1—N22.029 (8)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C1—H1A···Br1i0.962.893.849 (14)178
C8—H8···Br2ii0.932.893.771 (14)158
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1, −y+1, −z.
Acknowledgements top

We are grateful to the Islamic Azad University, Omidieh Branch, for financial support.

references
References top

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