metal-organic compounds
Poly[(μ2-4,4′-bipyridine-κ2N:N′)bis(μ2-2-phenoxypropionato-κ2O:O′)cobalt(II)]
aCollege of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, People's Republic of China, and bZhejiang Normal University Xingzhi College, Jinhua, Zhejiang 321004, People's Republic of China
*Correspondence e-mail: sky53@zjnu.cn
In the polymeric title compound, [Co(C9H9O3)2(C10H8N2)]n, the CoII ion is located on a twofold rotation axis and is six-coordinated by two N atoms from two 4,4′-bipyridine (4,4′-bipy) ligands in axial positions and by four O atoms from four 2-phenoxypropionate (POPA) anions in equatorial positions, defining a slightly distorted octahedral geometry. The carboxylate group of the POPA anion displays a bis-monodentate mode, linking pairs of CoII ions into a chain parallel to [001]. Adjacent chains are connected in a perpendicular manner through 4,4′-bipy ligands into layers parallel to (100). The 4,4′-bipy ligand is likewise located on a twofold rotation axis, with a dihedral angle between the two pyridine rings of 57.05 (7)°. C—H⋯O hydrogen-bonding interactions are present within the layers. π–π stacking interactions between the POPA benzene rings of neighbouring layers [centroid-to-centroid distance = 3.976 (3) Å and plane-to-plane distance = 3.618 (3) Å] stabilize the packing of the structure.
Related literature
For background to phenoxyalkanoic acids, see: Müller & Buser (1997). For other metal complexes derived from phenoxypropionic acid, see: Shen et al. (2011a,b,c,d). For a related cobalt complex, see: Zhuang et al. (2007).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2006); cell SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536811042875/wm2537sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811042875/wm2537Isup2.hkl
Reagents and solvents used were of commercially available quality and were not further purified before using. 2-Phenoxyproionic acid (0.332 g, 2 mmol), 4,4'-bipy (0.156 g, 1 mmol) were mixed in distilled water (30 ml), NaOH (1 M) was added dropwise to the solution to adjust a pH of 5–6, then CoCl2.6H2O (0.238 g, 1 mmol) was added and the mixture sealed in a 50 ml stainless steel reactor and kept at 433 K for 3 d. The reactor was then cooled to room temperature at a speed of 5 K h-1. Red single crystals were obtained in high yield and filtered off from the solution.
The H atoms bonded to C and N atoms were positioned geometrically and refined using a riding model [aliphatic C—H = 0.96 Å (Uiso(H) = 1.5Ueq(C)), aromatic C—H = 0.93 Å (Uiso(H) = 1.2Ueq(C))].
Data collection: APEX2 (Bruker, 2006); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).[Co(C9H9O3)2(C10H8N2)] | F(000) = 1132 |
Mr = 545.44 | Dx = 1.373 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 3897 reflections |
a = 23.6748 (14) Å | θ = 1.7–25.0° |
b = 11.6289 (7) Å | µ = 0.70 mm−1 |
c = 9.6440 (6) Å | T = 296 K |
β = 96.353 (4)° | Block, red |
V = 2638.8 (3) Å3 | 0.41 × 0.20 × 0.19 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 2319 independent reflections |
Radiation source: fine-focus sealed tube | 2053 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
ϕ and ω scans | θmax = 25.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −28→26 |
Tmin = 0.847, Tmax = 0.879 | k = −13→11 |
8421 measured reflections | l = −11→11 |
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)] = 0.027 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.068 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0338P)2 + 1.1007P] where P = (Fo2 + 2Fc2)/3 |
2319 reflections | (Δ/σ)max < 0.001 |
170 parameters | Δρmax = 0.21 e Å−3 |
0 restraints | Δρmin = −0.19 e Å−3 |
[Co(C9H9O3)2(C10H8N2)] | V = 2638.8 (3) Å3 |
Mr = 545.44 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 23.6748 (14) Å | µ = 0.70 mm−1 |
b = 11.6289 (7) Å | T = 296 K |
c = 9.6440 (6) Å | 0.41 × 0.20 × 0.19 mm |
β = 96.353 (4)° |
Bruker APEXII CCD diffractometer | 2319 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2053 reflections with I > 2σ(I) |
Tmin = 0.847, Tmax = 0.879 | Rint = 0.023 |
8421 measured reflections |
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.068 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.21 e Å−3 |
2319 reflections | Δρmin = −0.19 e Å−3 |
170 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 | ||
Co1 | 0.5000 | 0.52263 (3) | 0.7500 | 0.02374 (11) | |
O3 | 0.55380 (5) | 0.53098 (11) | 0.92961 (11) | 0.0393 (3) | |
C9 | 0.58754 (7) | 0.49847 (13) | 1.02991 (16) | 0.0281 (4) | |
N1 | 0.5000 | 0.71171 (16) | 0.7500 | 0.0290 (4) | |
C8 | 0.67426 (10) | 0.6225 (2) | 1.0358 (3) | 0.0794 (8) | |
H8A | 0.7136 | 0.6252 | 1.0199 | 0.119* | |
H8B | 0.6708 | 0.6423 | 1.1312 | 0.119* | |
H8C | 0.6530 | 0.6762 | 0.9751 | 0.119* | |
C7 | 0.65102 (8) | 0.50059 (19) | 1.0060 (2) | 0.0493 (5) | |
H7 | 0.6548 | 0.4805 | 0.9088 | 0.059* | |
C11 | 0.45124 (8) | 0.89365 (15) | 0.76775 (19) | 0.0384 (4) | |
H11 | 0.4177 | 0.9315 | 0.7812 | 0.046* | |
O1 | 0.68453 (5) | 0.42260 (14) | 1.09706 (14) | 0.0555 (4) | |
C10 | 0.45282 (7) | 0.77274 (15) | 0.76537 (19) | 0.0367 (4) | |
H10 | 0.4194 | 0.7328 | 0.7749 | 0.044* | |
C6 | 0.64660 (10) | 0.2551 (2) | 0.9605 (3) | 0.0699 (7) | |
H6 | 0.6246 | 0.3010 | 0.8965 | 0.084* | |
C1 | 0.64664 (11) | 0.1349 (3) | 0.9439 (3) | 0.0883 (9) | |
H1 | 0.6251 | 0.1027 | 0.8671 | 0.106* | |
C5 | 0.67937 (8) | 0.3048 (2) | 1.0721 (2) | 0.0536 (6) | |
C4 | 0.71055 (10) | 0.2322 (2) | 1.1675 (2) | 0.0651 (7) | |
H4 | 0.7324 | 0.2641 | 1.2440 | 0.078* | |
C3 | 0.70968 (11) | 0.1124 (3) | 1.1507 (3) | 0.0810 (8) | |
H3 | 0.7308 | 0.0661 | 1.2158 | 0.097* | |
C2 | 0.67765 (12) | 0.0629 (3) | 1.0379 (4) | 0.0906 (9) | |
H2 | 0.6770 | −0.0164 | 1.0256 | 0.109* | |
C12 | 0.5000 | 0.95685 (19) | 0.7500 | 0.0307 (5) | |
O2 | 0.57552 (5) | 0.47394 (10) | 1.14927 (11) | 0.0339 (3) | |
C13 | 0.5000 | 0.08758 (19) | 0.7500 | 0.0294 (5) | |
N2 | 0.5000 | 0.33300 (16) | 0.7500 | 0.0311 (4) | |
C14 | 0.48321 (8) | 0.15074 (14) | 0.86106 (17) | 0.0390 (4) | |
H14A | 0.4708 | 0.1130 | 0.9371 | 0.047* | |
C15 | 0.48508 (8) | 0.27175 (15) | 0.85836 (17) | 0.0380 (4) | |
H15A | 0.4754 | 0.3115 | 0.9360 | 0.046* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Co1 | 0.03125 (19) | 0.01885 (18) | 0.02070 (16) | 0.000 | 0.00108 (12) | 0.000 |
O3 | 0.0410 (7) | 0.0518 (8) | 0.0235 (6) | 0.0044 (6) | −0.0037 (5) | −0.0006 (5) |
C9 | 0.0328 (9) | 0.0268 (10) | 0.0250 (8) | −0.0021 (7) | 0.0040 (7) | −0.0023 (6) |
N1 | 0.0354 (11) | 0.0228 (11) | 0.0283 (10) | 0.000 | 0.0020 (8) | 0.000 |
C8 | 0.0486 (14) | 0.088 (2) | 0.1002 (19) | −0.0260 (13) | 0.0020 (13) | 0.0290 (16) |
C7 | 0.0350 (11) | 0.0761 (16) | 0.0378 (10) | 0.0012 (10) | 0.0077 (8) | 0.0059 (10) |
C11 | 0.0383 (10) | 0.0266 (10) | 0.0519 (10) | 0.0060 (8) | 0.0123 (8) | 0.0033 (8) |
O1 | 0.0366 (8) | 0.0757 (11) | 0.0525 (8) | 0.0119 (7) | −0.0024 (6) | −0.0041 (8) |
C10 | 0.0350 (10) | 0.0263 (10) | 0.0497 (10) | −0.0025 (8) | 0.0088 (8) | 0.0017 (8) |
C6 | 0.0475 (14) | 0.096 (2) | 0.0644 (15) | 0.0133 (13) | 0.0001 (11) | −0.0174 (14) |
C1 | 0.0584 (17) | 0.102 (2) | 0.103 (2) | 0.0051 (16) | 0.0024 (15) | −0.0423 (19) |
C5 | 0.0315 (10) | 0.0771 (17) | 0.0535 (12) | 0.0076 (10) | 0.0104 (9) | −0.0093 (11) |
C4 | 0.0461 (13) | 0.086 (2) | 0.0623 (14) | 0.0115 (12) | 0.0026 (11) | −0.0031 (13) |
C3 | 0.0592 (16) | 0.084 (2) | 0.101 (2) | 0.0153 (15) | 0.0129 (15) | 0.0090 (17) |
C2 | 0.0567 (17) | 0.079 (2) | 0.139 (3) | 0.0018 (16) | 0.0263 (18) | −0.024 (2) |
C12 | 0.0462 (15) | 0.0207 (14) | 0.0255 (11) | 0.000 | 0.0046 (10) | 0.000 |
O2 | 0.0351 (7) | 0.0398 (7) | 0.0276 (6) | 0.0029 (5) | 0.0070 (5) | 0.0071 (5) |
C13 | 0.0388 (14) | 0.0197 (13) | 0.0294 (11) | 0.000 | 0.0022 (10) | 0.000 |
N2 | 0.0419 (12) | 0.0229 (11) | 0.0282 (10) | 0.000 | 0.0019 (9) | 0.000 |
C14 | 0.0627 (12) | 0.0250 (10) | 0.0312 (9) | 0.0026 (9) | 0.0133 (8) | 0.0049 (7) |
C15 | 0.0605 (12) | 0.0258 (10) | 0.0292 (8) | 0.0051 (9) | 0.0119 (8) | −0.0018 (7) |
Co1—O3i | 2.0357 (12) | C6—C5 | 1.382 (3) |
Co1—O3 | 2.0357 (12) | C6—C1 | 1.407 (4) |
Co1—O2ii | 2.1275 (11) | C6—H6 | 0.9300 |
Co1—O2iii | 2.1275 (11) | C1—C2 | 1.384 (4) |
Co1—N1 | 2.1989 (19) | C1—H1 | 0.9300 |
Co1—N2 | 2.2051 (19) | C5—C4 | 1.398 (3) |
O3—C9 | 1.243 (2) | C4—C3 | 1.402 (4) |
C9—O2 | 1.2489 (18) | C4—H4 | 0.9300 |
C9—C7 | 1.546 (2) | C3—C2 | 1.381 (4) |
N1—C10 | 1.3453 (19) | C3—H3 | 0.9300 |
N1—C10i | 1.3453 (19) | C2—H2 | 0.9300 |
C8—C7 | 1.537 (3) | C12—C11i | 1.395 (2) |
C8—H8A | 0.9600 | C12—C13iv | 1.520 (3) |
C8—H8B | 0.9600 | O2—Co1iii | 2.1275 (11) |
C8—H8C | 0.9600 | C13—C14 | 1.3924 (19) |
C7—O1 | 1.438 (2) | C13—C14i | 1.392 (2) |
C7—H7 | 0.9800 | C13—C12v | 1.520 (3) |
C11—C12 | 1.395 (2) | N2—C15i | 1.3439 (19) |
C11—C10 | 1.407 (2) | N2—C15 | 1.3439 (19) |
C11—H11 | 0.9300 | C14—C15 | 1.408 (2) |
O1—C5 | 1.394 (3) | C14—H14A | 0.9300 |
C10—H10 | 0.9300 | C15—H15A | 0.9300 |
O3i—Co1—O3 | 174.53 (7) | N1—C10—C11 | 123.57 (16) |
O3i—Co1—O2ii | 95.10 (5) | N1—C10—H10 | 118.2 |
O3—Co1—O2ii | 84.80 (5) | C11—C10—H10 | 118.2 |
O3i—Co1—O2iii | 84.80 (5) | C5—C6—C1 | 119.8 (3) |
O3—Co1—O2iii | 95.10 (5) | C5—C6—H6 | 120.1 |
O2ii—Co1—O2iii | 177.85 (6) | C1—C6—H6 | 120.1 |
O3i—Co1—N1 | 87.26 (4) | C2—C1—C6 | 122.3 (3) |
O3—Co1—N1 | 87.26 (4) | C2—C1—H1 | 118.9 |
O2ii—Co1—N1 | 88.93 (3) | C6—C1—H1 | 118.9 |
O2iii—Co1—N1 | 88.93 (3) | C6—C5—O1 | 125.2 (2) |
O3i—Co1—N2 | 92.74 (4) | C6—C5—C4 | 118.1 (2) |
O3—Co1—N2 | 92.74 (4) | O1—C5—C4 | 116.7 (2) |
O2ii—Co1—N2 | 91.07 (3) | C5—C4—C3 | 121.6 (2) |
O2iii—Co1—N2 | 91.07 (3) | C5—C4—H4 | 119.2 |
N1—Co1—N2 | 180.0 | C3—C4—H4 | 119.2 |
C9—O3—Co1 | 159.26 (12) | C2—C3—C4 | 120.4 (3) |
O3—C9—O2 | 126.46 (16) | C2—C3—H3 | 119.8 |
O3—C9—C7 | 115.51 (14) | C4—C3—H3 | 119.8 |
O2—C9—C7 | 117.75 (15) | C3—C2—C1 | 118.0 (3) |
C10—N1—C10i | 116.3 (2) | C3—C2—H2 | 121.0 |
C10—N1—Co1 | 121.84 (10) | C1—C2—H2 | 121.0 |
C10i—N1—Co1 | 121.84 (10) | C11—C12—C11i | 116.4 (2) |
C7—C8—H8A | 109.5 | C11—C12—C13iv | 121.80 (10) |
C7—C8—H8B | 109.5 | C11i—C12—C13iv | 121.80 (10) |
H8A—C8—H8B | 109.5 | C9—O2—Co1iii | 134.85 (11) |
C7—C8—H8C | 109.5 | C14—C13—C14i | 116.3 (2) |
H8A—C8—H8C | 109.5 | C14—C13—C12v | 121.84 (10) |
H8B—C8—H8C | 109.5 | C14i—C13—C12v | 121.84 (10) |
O1—C7—C8 | 107.80 (18) | C15i—N2—C15 | 116.0 (2) |
O1—C7—C9 | 112.24 (15) | C15i—N2—Co1 | 122.01 (10) |
C8—C7—C9 | 108.70 (17) | C15—N2—Co1 | 122.01 (10) |
O1—C7—H7 | 109.4 | C13—C14—C15 | 120.04 (15) |
C8—C7—H7 | 109.4 | C13—C14—H14A | 120.0 |
C9—C7—H7 | 109.4 | C15—C14—H14A | 120.0 |
C12—C11—C10 | 120.05 (16) | N2—C15—C14 | 123.75 (15) |
C12—C11—H11 | 120.0 | N2—C15—H15A | 118.1 |
C10—C11—H11 | 120.0 | C14—C15—H15A | 118.1 |
C5—O1—C7 | 118.84 (16) | ||
O2ii—Co1—O3—C9 | −81.2 (3) | C1—C6—C5—C4 | −1.7 (3) |
O2iii—Co1—O3—C9 | 101.0 (3) | C7—O1—C5—C6 | 4.0 (3) |
N1—Co1—O3—C9 | −170.3 (3) | C7—O1—C5—C4 | −176.79 (16) |
N2—Co1—O3—C9 | 9.7 (3) | C6—C5—C4—C3 | 0.9 (3) |
Co1—O3—C9—O2 | −96.6 (3) | O1—C5—C4—C3 | −178.37 (19) |
Co1—O3—C9—C7 | 89.7 (3) | C5—C4—C3—C2 | 0.1 (4) |
O3i—Co1—N1—C10 | 65.25 (10) | C4—C3—C2—C1 | −0.3 (4) |
O3—Co1—N1—C10 | −114.75 (10) | C6—C1—C2—C3 | −0.4 (4) |
O2ii—Co1—N1—C10 | 160.41 (10) | C10—C11—C12—C11i | −0.79 (12) |
O2iii—Co1—N1—C10 | −19.59 (10) | C10—C11—C12—C13iv | 179.21 (12) |
O3i—Co1—N1—C10i | −114.75 (10) | O3—C9—O2—Co1iii | −2.7 (3) |
O3—Co1—N1—C10i | 65.25 (10) | C7—C9—O2—Co1iii | 170.92 (12) |
O2ii—Co1—N1—C10i | −19.59 (10) | O3i—Co1—N2—C15i | 56.44 (11) |
O2iii—Co1—N1—C10i | 160.41 (10) | O3—Co1—N2—C15i | −123.56 (11) |
O3—C9—C7—O1 | −156.70 (16) | O2ii—Co1—N2—C15i | −38.72 (10) |
O2—C9—C7—O1 | 29.0 (2) | O2iii—Co1—N2—C15i | 141.28 (10) |
O3—C9—C7—C8 | 84.2 (2) | O3i—Co1—N2—C15 | −123.56 (11) |
O2—C9—C7—C8 | −90.2 (2) | O3—Co1—N2—C15 | 56.44 (11) |
C8—C7—O1—C5 | −167.58 (16) | O2ii—Co1—N2—C15 | 141.28 (11) |
C9—C7—O1—C5 | 72.7 (2) | O2iii—Co1—N2—C15 | −38.72 (11) |
C10i—N1—C10—C11 | −0.85 (13) | C14i—C13—C14—C15 | −1.47 (13) |
Co1—N1—C10—C11 | 179.15 (13) | C12v—C13—C14—C15 | 178.53 (13) |
C12—C11—C10—N1 | 1.7 (3) | C15i—N2—C15—C14 | −1.59 (14) |
C5—C6—C1—C2 | 1.5 (4) | Co1—N2—C15—C14 | 178.41 (14) |
C1—C6—C5—O1 | 177.6 (2) | C13—C14—C15—N2 | 3.2 (3) |
Symmetry codes: (i) −x+1, y, −z+3/2; (ii) x, −y+1, z−1/2; (iii) −x+1, −y+1, −z+2; (iv) x, y+1, z; (v) x, y−1, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10···O2iii | 0.93 | 2.51 | 3.079 (2) | 120 |
C15—H15A···O3iii | 0.93 | 2.38 | 3.272 (2) | 159 |
Symmetry code: (iii) −x+1, −y+1, −z+2. |
Experimental details
Crystal data | |
Chemical formula | [Co(C9H9O3)2(C10H8N2)] |
Mr | 545.44 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 296 |
a, b, c (Å) | 23.6748 (14), 11.6289 (7), 9.6440 (6) |
β (°) | 96.353 (4) |
V (Å3) | 2638.8 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.70 |
Crystal size (mm) | 0.41 × 0.20 × 0.19 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.847, 0.879 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8421, 2319, 2053 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.068, 1.06 |
No. of reflections | 2319 |
No. of parameters | 170 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.19 |
Computer programs: APEX2 (Bruker, 2006), SAINT (Bruker, 2006), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2006), publCIF (Westrip, 2010).
Co1—O3 | 2.0357 (12) | Co1—N1 | 2.1989 (19) |
Co1—O2i | 2.1275 (11) | Co1—N2 | 2.2051 (19) |
Symmetry code: (i) −x+1, −y+1, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10···O2i | 0.93 | 2.51 | 3.079 (2) | 119.5 |
C15—H15A···O3i | 0.93 | 2.38 | 3.272 (2) | 158.8 |
Symmetry code: (i) −x+1, −y+1, −z+2. |
References
Brandenburg, K. (2006). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
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The group of phenoxyalkanoic acids include important herbicides. The desired biological activity is largely dependent on the length of the carbon chain of the alkanoic acid, the nature of the phenoxy group, and the position of its attachment to the carbon chain (Müller & Buser, 1997). Therefore the structures of metal complexes of 2-phenoxypropionic acid became interesting for us. Recently, we have reported some results in this regard (Shen et al., 2011a,b,c,d). Here, we describe a new CoII complex with 4,4'-bipyridine (4,4'-bipy) as a co-ligand.
The structure of the polymeric title complex is shown in Fig. 1. The CoII ion is located on a twofold rotation axis and is six-coordinated by four carboxylate O atoms from four POPA ligands and two N atoms of two 4,4'-bipy ligands in an octahedral geometry. The Co—O distances are 2.0357 (12) and 2.1275 (11) Å, and the Co—N distances are 2.1989 (19) and 2.2051 (19) Å, all of which are similar to related structures (Zhuang et al., 2007). The 4,4'-bipy ligand exhibits symmetry 2, with a dihedral angle between the two pyridine rings of 57.05 (7)°. The carboxylate groups of the POPA anions display a bis-monodentate mode, bridging pairs of CoII ions into chains parallel to [001]. The 4,4'-bipy molecules connect these chains perpendicularly, resulting in a layered arrangement parallel to (100) (Fig. 2).
As also shown in Fig. 2, intra-layer C—H···O hydrogen bonds between the C atoms of 4,4'-bipy ligands and carboxylate O atoms are present. Adjacent layers are stacked along [100] through π—π interactions between benzene rings of the POPA anions, with centroid–centroid and plane to plane distance of 3.976 (3) Å and 3.618 (3) Å, respectively.