Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807032242/ci2409sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807032242/ci2409Isup2.hkl |
CCDC reference: 657560
The organic ligand, [1]benzofuro[3,2-c]pyridine, was prepared according literature procedures of Bobošík et al. (1995) and Bencková & Krutošíková (1995, 1999). To a Cu(CH3CO2)2.H2O (1.5 mmol) solution in ethanol (5 ml) was added the solution of [1]benzofuro[3,2-c]pyridine (3.2 mmol) in ethanol (2 ml). Small blue-green crystals were collected after 2 d. These were filtered off, washed with ethanol and recrystallized from THF.
All H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms, with C—H distances in the range 0.93–0.96 Å and Uiso set at 1.2Ueq (1.5Ueq for methyl) of the parent atom.
Copper(II) complexes have attracted much attention over the past decade due to their role in biological systems. A great number of copper(II) complexes with various organic ligands have been a subject of intense study because of their interesting properties from many different (chemical, structural and biological) points of view. Copper(II) complexes with bridging acetate ligands have received much attention for their various coordination geometries (Comba et al., 1999; Cox et al., 2000) and potential biological significance (Berners-Price et al., 1987). In addition, some copper(II) complexes also have shown antitumor and antiproliferative effects (Francesca et al., 2005; Nikhil et al., 2001). The furo[3,2-c]pyridine and its derivatives represent quinoline isosters, in which the benzene ring is replaced by the furan and pyridine ring can be readily coordinated to metal centers through N-donor atom (Miklovič et al., 2004; Baran et al., 2005). We report here the synthesis and crystal structure of the title compound.
Molecules of the title compound lie on centers of inversion. As illustrated in Fig.1, the two CuII atoms are bridged by four acetate groups in the syn-syn mode, forming a dinuclear structure. The Cu1···Cu1i [symmetry code: (i) 1 - x, -y, 1 - z] distance is 2.6330 (6) Å, very similar to the values found in other dimeric copper(II) carboxylate complexes (Musie et al., 2006; Su et al., 2006; Moncol et al., 2007). Each CuII atom displays an approximate square-pyramidal geometry with four acetate O atoms in the basal plane [Cu—O = 1.9562 (19)–1.9731 (19) Å] and the N atom of the benzofuro[3,2-c]pyridine ligand (BFP) in the apical position [Cu—N = 2.180 (2) Å]. Atom Cu1 is displaced from the least-squares plane defined by the basal atoms by 0.2064 (3) Å towards the apical N atom. The BFP ligand is almost planar (mean deviation is 0.01 (3) Å), the dihedral angle between the O16/O14/Cu1/O16'/O14'/Cu1' plane and the BFP ring is 24.51 (4)°.
In the crystal structure, the complexes are linked by C—H···O interactions (H···O = 2.41–2.42 Å and C···O = 3.210 (3)–3.364 (3) Å] to form zigzag layers parallel to the ab plane.
For related literature, see: Baran et al. (2005); Bencková & Krutošíková (1995, 1999); Berners-Price et al. (1987); Bobošík et al. (1995); Comba et al. (1999); Cox et al. (2000); Francesca et al. (2005); Miklovič et al. (2004); Moncol et al. (2007); Musie et al. (2006); Nikhil et al. (2001); Su et al. (2006).
Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell refinement: CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND (Brandenburg, 2001); software used to prepare material for publication: enCIFer (Allen et al., 2004).
[Cu2(C2H3O2)4(C11H7NO)2] | F(000) = 1432 |
Mr = 701.60 | Dx = 1.492 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 22540 reflections |
a = 13.6706 (2) Å | θ = 2.9–27.0° |
b = 8.2336 (1) Å | µ = 1.42 mm−1 |
c = 27.7541 (4) Å | T = 298 K |
V = 3123.95 (7) Å3 | Block, blue-green |
Z = 4 | 0.42 × 0.29 × 0.17 mm |
Oxford Diffraction Gemini R CCD diffractometer | 3185 independent reflections |
Radiation source: fine-focus sealed tube | 2574 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
Rotation method data acquisition using ω and φ scans | θmax = 26.4°, θmin = 4.1° |
Absorption correction: analytical (Clark & Reid, 1995) | h = −17→17 |
Tmin = 0.542, Tmax = 0.785 | k = −10→10 |
65563 measured reflections | l = −34→34 |
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)] = 0.034 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.103 | H-atom parameters constrained |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0323P)2 + 2.9514P] where P = (Fo2 + 2Fc2)/3 |
3185 reflections | (Δ/σ)max = 0.002 |
201 parameters | Δρmax = 0.48 e Å−3 |
0 restraints | Δρmin = −0.32 e Å−3 |
[Cu2(C2H3O2)4(C11H7NO)2] | V = 3123.95 (7) Å3 |
Mr = 701.60 | Z = 4 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 13.6706 (2) Å | µ = 1.42 mm−1 |
b = 8.2336 (1) Å | T = 298 K |
c = 27.7541 (4) Å | 0.42 × 0.29 × 0.17 mm |
Oxford Diffraction Gemini R CCD diffractometer | 3185 independent reflections |
Absorption correction: analytical (Clark & Reid, 1995) | 2574 reflections with I > 2σ(I) |
Tmin = 0.542, Tmax = 0.785 | Rint = 0.029 |
65563 measured reflections |
R[F2 > 2σ(F2)] = 0.034 | 0 restraints |
wR(F2) = 0.103 | H-atom parameters constrained |
S = 1.09 | Δρmax = 0.48 e Å−3 |
3185 reflections | Δρmin = −0.32 e Å−3 |
201 parameters |
Experimental. face-indexed (CrysAlis RED; Oxford Diffraction, 2006) |
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. |
x | y | z | Uiso*/Ueq | ||
C2 | 0.70235 (19) | 0.2627 (3) | 0.40930 (10) | 0.0478 (6) | |
H2A | 0.7306 | 0.2572 | 0.4397 | 0.057* | |
C3 | 0.7556 (2) | 0.3325 (4) | 0.37304 (10) | 0.0565 (7) | |
H3A | 0.8180 | 0.3743 | 0.3781 | 0.068* | |
C5 | 0.6905 (4) | 0.4181 (6) | 0.20420 (14) | 0.1018 (15) | |
H5A | 0.7467 | 0.4678 | 0.1925 | 0.122* | |
C6 | 0.6130 (4) | 0.3843 (7) | 0.17489 (14) | 0.1127 (18) | |
H6A | 0.6168 | 0.4113 | 0.1424 | 0.135* | |
C7 | 0.5302 (4) | 0.3122 (7) | 0.19172 (14) | 0.1055 (16) | |
H7A | 0.4791 | 0.2917 | 0.1705 | 0.127* | |
C8 | 0.5200 (3) | 0.2682 (6) | 0.23994 (12) | 0.0854 (12) | |
H8A | 0.4631 | 0.2194 | 0.2512 | 0.103* | |
C9 | 0.5702 (2) | 0.2094 (3) | 0.36038 (9) | 0.0459 (6) | |
H9A | 0.5070 | 0.1697 | 0.3564 | 0.055* | |
C10 | 0.7114 (2) | 0.3368 (4) | 0.32895 (10) | 0.0537 (7) | |
C11 | 0.6812 (3) | 0.3746 (5) | 0.25224 (12) | 0.0747 (10) | |
C12 | 0.5977 (2) | 0.2997 (4) | 0.27031 (10) | 0.0628 (8) | |
C13 | 0.6181 (2) | 0.2743 (4) | 0.32132 (9) | 0.0487 (6) | |
C15 | 0.6669 (2) | −0.0453 (4) | 0.53715 (10) | 0.0517 (7) | |
C17 | 0.7680 (2) | −0.0657 (5) | 0.55807 (13) | 0.0756 (10) | |
H17A | 0.7629 | −0.0931 | 0.5916 | 0.113* | |
H17B | 0.8037 | 0.0341 | 0.5547 | 0.113* | |
H17C | 0.8017 | −0.1508 | 0.5413 | 0.113* | |
C19 | 0.51878 (19) | −0.2616 (3) | 0.45388 (9) | 0.0432 (6) | |
C21 | 0.5319 (3) | −0.4195 (3) | 0.42755 (13) | 0.0645 (9) | |
H21A | 0.4842 | −0.4275 | 0.4023 | 0.097* | |
H21B | 0.5235 | −0.5082 | 0.4496 | 0.097* | |
H21C | 0.5964 | −0.4239 | 0.4139 | 0.097* | |
N1 | 0.61150 (15) | 0.2016 (2) | 0.40376 (7) | 0.0403 (5) | |
O4 | 0.75112 (18) | 0.3981 (3) | 0.28729 (8) | 0.0785 (7) | |
O14 | 0.66150 (14) | 0.0289 (3) | 0.49771 (7) | 0.0605 (5) | |
O16 | 0.59648 (15) | −0.1010 (3) | 0.56013 (7) | 0.0599 (5) | |
O18 | 0.54378 (14) | −0.1354 (2) | 0.43235 (7) | 0.0528 (5) | |
O20 | 0.48062 (16) | −0.2675 (2) | 0.49478 (7) | 0.0548 (5) | |
Cu1 | 0.53871 (2) | 0.07893 (4) | 0.463419 (10) | 0.03838 (14) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C2 | 0.0516 (14) | 0.0546 (15) | 0.0371 (13) | 0.0007 (12) | −0.0041 (11) | −0.0014 (11) |
C3 | 0.0459 (14) | 0.073 (2) | 0.0507 (16) | −0.0091 (14) | −0.0022 (13) | 0.0041 (14) |
C5 | 0.112 (3) | 0.143 (4) | 0.051 (2) | 0.019 (3) | 0.017 (2) | 0.037 (2) |
C6 | 0.130 (4) | 0.169 (5) | 0.040 (2) | 0.041 (4) | 0.001 (2) | 0.027 (3) |
C7 | 0.125 (4) | 0.148 (5) | 0.043 (2) | 0.022 (3) | −0.025 (2) | 0.007 (3) |
C8 | 0.096 (3) | 0.114 (3) | 0.046 (2) | 0.002 (2) | −0.0189 (18) | 0.005 (2) |
C9 | 0.0458 (13) | 0.0538 (15) | 0.0381 (14) | −0.0032 (12) | −0.0015 (11) | 0.0009 (11) |
C10 | 0.0533 (15) | 0.0664 (18) | 0.0415 (15) | −0.0018 (13) | 0.0043 (12) | 0.0073 (13) |
C11 | 0.081 (2) | 0.099 (3) | 0.0434 (17) | 0.005 (2) | 0.0041 (16) | 0.0211 (17) |
C12 | 0.072 (2) | 0.078 (2) | 0.0377 (15) | 0.0072 (17) | −0.0059 (14) | 0.0064 (14) |
C13 | 0.0539 (15) | 0.0585 (16) | 0.0338 (13) | 0.0033 (13) | −0.0016 (11) | 0.0030 (11) |
C15 | 0.0570 (17) | 0.0584 (16) | 0.0396 (15) | 0.0185 (14) | −0.0043 (12) | −0.0090 (12) |
C17 | 0.0528 (18) | 0.106 (3) | 0.068 (2) | 0.0206 (18) | −0.0119 (16) | −0.004 (2) |
C19 | 0.0480 (13) | 0.0389 (13) | 0.0428 (15) | 0.0084 (11) | 0.0091 (11) | −0.0001 (11) |
C21 | 0.092 (2) | 0.0427 (16) | 0.0593 (19) | 0.0002 (14) | 0.0242 (17) | −0.0096 (13) |
N1 | 0.0463 (11) | 0.0432 (11) | 0.0315 (10) | 0.0019 (9) | 0.0000 (9) | −0.0002 (8) |
O4 | 0.0671 (14) | 0.115 (2) | 0.0535 (13) | −0.0139 (13) | 0.0089 (12) | 0.0285 (13) |
O14 | 0.0484 (11) | 0.0798 (14) | 0.0534 (12) | 0.0052 (10) | −0.0035 (9) | 0.0102 (11) |
O16 | 0.0558 (12) | 0.0810 (15) | 0.0428 (11) | 0.0132 (10) | −0.0063 (9) | 0.0065 (10) |
O18 | 0.0747 (13) | 0.0408 (10) | 0.0427 (11) | −0.0008 (9) | 0.0190 (9) | −0.0060 (8) |
O20 | 0.0849 (14) | 0.0396 (10) | 0.0399 (10) | −0.0005 (9) | 0.0170 (10) | −0.0027 (8) |
Cu1 | 0.0451 (2) | 0.0407 (2) | 0.02941 (19) | 0.00430 (12) | 0.00409 (12) | 0.00026 (12) |
C2—N1 | 1.349 (3) | C12—C13 | 1.458 (4) |
C2—C3 | 1.369 (4) | C15—O16 | 1.242 (4) |
C2—H2A | 0.93 | C15—O14 | 1.256 (3) |
C3—C10 | 1.365 (4) | C15—C17 | 1.509 (4) |
C3—H3A | 0.93 | C17—H17A | 0.96 |
C5—C6 | 1.364 (7) | C17—H17B | 0.96 |
C5—C11 | 1.386 (5) | C17—H17C | 0.96 |
C5—H5A | 0.93 | C19—O18 | 1.246 (3) |
C6—C7 | 1.360 (7) | C19—O20 | 1.250 (3) |
C6—H6A | 0.93 | C19—C21 | 1.503 (4) |
C7—C8 | 1.393 (6) | C21—H21A | 0.96 |
C7—H7A | 0.93 | C21—H21B | 0.96 |
C8—C12 | 1.381 (5) | C21—H21C | 0.96 |
C8—H8A | 0.93 | N1—Cu1 | 2.180 (2) |
C9—N1 | 1.331 (3) | O14—Cu1 | 1.9731 (19) |
C9—C13 | 1.375 (4) | O16—Cu1i | 1.969 (2) |
C9—H9A | 0.93 | O18—Cu1 | 1.9650 (19) |
C10—O4 | 1.373 (3) | O20—Cu1i | 1.9562 (19) |
C10—C13 | 1.392 (4) | Cu1—O20i | 1.9562 (19) |
C11—O4 | 1.377 (4) | Cu1—O16i | 1.969 (2) |
C11—C12 | 1.391 (5) | Cu1—Cu1i | 2.6330 (6) |
N1—C2—C3 | 124.3 (2) | C15—C17—H17B | 109.5 |
N1—C2—H2A | 117.9 | H17A—C17—H17B | 109.5 |
C3—C2—H2A | 117.9 | C15—C17—H17C | 109.5 |
C10—C3—C2 | 115.7 (3) | H17A—C17—H17C | 109.5 |
C10—C3—H3A | 122.1 | H17B—C17—H17C | 109.5 |
C2—C3—H3A | 122.1 | O18—C19—O20 | 125.6 (2) |
C6—C5—C11 | 116.8 (4) | O18—C19—C21 | 117.1 (2) |
C6—C5—H5A | 121.6 | O20—C19—C21 | 117.2 (2) |
C11—C5—H5A | 121.6 | C19—C21—H21A | 109.5 |
C7—C6—C5 | 122.0 (4) | C19—C21—H21B | 109.5 |
C7—C6—H6A | 119.0 | H21A—C21—H21B | 109.5 |
C5—C6—H6A | 119.0 | C19—C21—H21C | 109.5 |
C6—C7—C8 | 121.8 (4) | H21A—C21—H21C | 109.5 |
C6—C7—H7A | 119.1 | H21B—C21—H21C | 109.5 |
C8—C7—H7A | 119.1 | C9—N1—C2 | 118.4 (2) |
C12—C8—C7 | 117.4 (4) | C9—N1—Cu1 | 121.04 (17) |
C12—C8—H8A | 121.3 | C2—N1—Cu1 | 120.44 (17) |
C7—C8—H8A | 121.3 | C10—O4—C11 | 105.6 (2) |
N1—C9—C13 | 122.0 (2) | C15—O14—Cu1 | 124.9 (2) |
N1—C9—H9A | 119.0 | C15—O16—Cu1i | 121.51 (18) |
C13—C9—H9A | 119.0 | C19—O18—Cu1 | 121.90 (16) |
C3—C10—O4 | 126.1 (3) | C19—O20—Cu1i | 124.31 (18) |
C3—C10—C13 | 122.2 (3) | O20i—Cu1—O18 | 167.88 (8) |
O4—C10—C13 | 111.7 (2) | O20i—Cu1—O16i | 89.82 (9) |
O4—C11—C5 | 125.4 (4) | O18—Cu1—O16i | 88.29 (9) |
O4—C11—C12 | 112.2 (3) | O20i—Cu1—O14 | 89.69 (10) |
C5—C11—C12 | 122.4 (4) | O18—Cu1—O14 | 89.67 (9) |
C8—C12—C11 | 119.7 (3) | O16i—Cu1—O14 | 167.97 (9) |
C8—C12—C13 | 135.5 (3) | O20i—Cu1—N1 | 98.31 (8) |
C11—C12—C13 | 104.9 (3) | O18—Cu1—N1 | 93.81 (8) |
C9—C13—C10 | 117.4 (2) | O16i—Cu1—N1 | 97.68 (8) |
C9—C13—C12 | 136.9 (3) | O14—Cu1—N1 | 94.29 (8) |
C10—C13—C12 | 105.7 (3) | O20i—Cu1—Cu1i | 83.12 (6) |
O16—C15—O14 | 125.6 (3) | O18—Cu1—Cu1i | 84.80 (6) |
O16—C15—C17 | 118.1 (3) | O16i—Cu1—Cu1i | 85.65 (6) |
O14—C15—C17 | 116.3 (3) | O14—Cu1—Cu1i | 82.35 (6) |
C15—C17—H17A | 109.5 | N1—Cu1—Cu1i | 176.36 (6) |
N1—C2—C3—C10 | −0.5 (5) | C5—C11—O4—C10 | −179.8 (4) |
C11—C5—C6—C7 | 0.3 (8) | C12—C11—O4—C10 | 0.0 (4) |
C5—C6—C7—C8 | −0.2 (9) | O16—C15—O14—Cu1 | 1.4 (4) |
C6—C7—C8—C12 | −0.4 (8) | C17—C15—O14—Cu1 | −177.9 (2) |
C2—C3—C10—O4 | −178.9 (3) | O14—C15—O16—Cu1i | 0.0 (4) |
C2—C3—C10—C13 | 0.0 (5) | C17—C15—O16—Cu1i | 179.2 (2) |
C6—C5—C11—O4 | 179.9 (4) | O20—C19—O18—Cu1 | 6.5 (4) |
C6—C5—C11—C12 | 0.1 (7) | C21—C19—O18—Cu1 | −176.2 (2) |
C7—C8—C12—C11 | 0.8 (6) | O18—C19—O20—Cu1i | −5.3 (4) |
C7—C8—C12—C13 | −179.7 (4) | C21—C19—O20—Cu1i | 177.4 (2) |
O4—C11—C12—C8 | 179.5 (3) | C19—O18—Cu1—O20i | −8.4 (6) |
C5—C11—C12—C8 | −0.7 (6) | C19—O18—Cu1—O16i | −89.6 (2) |
O4—C11—C12—C13 | −0.1 (4) | C19—O18—Cu1—O14 | 78.5 (2) |
C5—C11—C12—C13 | 179.6 (4) | C19—O18—Cu1—N1 | 172.8 (2) |
N1—C9—C13—C10 | −1.8 (4) | C19—O18—Cu1—Cu1i | −3.8 (2) |
N1—C9—C13—C12 | 178.7 (3) | C15—O14—Cu1—O20i | 81.6 (2) |
C3—C10—C13—C9 | 1.1 (5) | C15—O14—Cu1—O18 | −86.3 (2) |
O4—C10—C13—C9 | −179.9 (3) | C15—O14—Cu1—O16i | −6.1 (6) |
C3—C10—C13—C12 | −179.3 (3) | C15—O14—Cu1—N1 | 179.9 (2) |
O4—C10—C13—C12 | −0.2 (4) | C15—O14—Cu1—Cu1i | −1.5 (2) |
C8—C12—C13—C9 | 0.1 (7) | C9—N1—Cu1—O20i | −115.6 (2) |
C11—C12—C13—C9 | 179.7 (4) | C2—N1—Cu1—O20i | 68.5 (2) |
C8—C12—C13—C10 | −179.4 (4) | C9—N1—Cu1—O18 | 64.1 (2) |
C11—C12—C13—C10 | 0.2 (4) | C2—N1—Cu1—O18 | −111.78 (19) |
C13—C9—N1—C2 | 1.4 (4) | C9—N1—Cu1—O16i | −24.6 (2) |
C13—C9—N1—Cu1 | −174.6 (2) | C2—N1—Cu1—O16i | 159.43 (19) |
C3—C2—N1—C9 | −0.2 (4) | C9—N1—Cu1—O14 | 154.1 (2) |
C3—C2—N1—Cu1 | 175.8 (2) | C2—N1—Cu1—O14 | −21.8 (2) |
C3—C10—O4—C11 | 179.2 (3) | C9—N1—Cu1—Cu1i | 131.5 (8) |
C13—C10—O4—C11 | 0.2 (4) | C2—N1—Cu1—Cu1i | −44.4 (10) |
Symmetry code: (i) −x+1, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Cu2(C2H3O2)4(C11H7NO)2] |
Mr | 701.60 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 298 |
a, b, c (Å) | 13.6706 (2), 8.2336 (1), 27.7541 (4) |
V (Å3) | 3123.95 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 1.42 |
Crystal size (mm) | 0.42 × 0.29 × 0.17 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini R CCD |
Absorption correction | Analytical (Clark & Reid, 1995) |
Tmin, Tmax | 0.542, 0.785 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 65563, 3185, 2574 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.034, 0.103, 1.09 |
No. of reflections | 3185 |
No. of parameters | 201 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.48, −0.32 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2006), CrysAlis RED (Oxford Diffraction, 2006), CrysAlis RED, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), DIAMOND (Brandenburg, 2001), enCIFer (Allen et al., 2004).
Copper(II) complexes have attracted much attention over the past decade due to their role in biological systems. A great number of copper(II) complexes with various organic ligands have been a subject of intense study because of their interesting properties from many different (chemical, structural and biological) points of view. Copper(II) complexes with bridging acetate ligands have received much attention for their various coordination geometries (Comba et al., 1999; Cox et al., 2000) and potential biological significance (Berners-Price et al., 1987). In addition, some copper(II) complexes also have shown antitumor and antiproliferative effects (Francesca et al., 2005; Nikhil et al., 2001). The furo[3,2-c]pyridine and its derivatives represent quinoline isosters, in which the benzene ring is replaced by the furan and pyridine ring can be readily coordinated to metal centers through N-donor atom (Miklovič et al., 2004; Baran et al., 2005). We report here the synthesis and crystal structure of the title compound.
Molecules of the title compound lie on centers of inversion. As illustrated in Fig.1, the two CuII atoms are bridged by four acetate groups in the syn-syn mode, forming a dinuclear structure. The Cu1···Cu1i [symmetry code: (i) 1 - x, -y, 1 - z] distance is 2.6330 (6) Å, very similar to the values found in other dimeric copper(II) carboxylate complexes (Musie et al., 2006; Su et al., 2006; Moncol et al., 2007). Each CuII atom displays an approximate square-pyramidal geometry with four acetate O atoms in the basal plane [Cu—O = 1.9562 (19)–1.9731 (19) Å] and the N atom of the benzofuro[3,2-c]pyridine ligand (BFP) in the apical position [Cu—N = 2.180 (2) Å]. Atom Cu1 is displaced from the least-squares plane defined by the basal atoms by 0.2064 (3) Å towards the apical N atom. The BFP ligand is almost planar (mean deviation is 0.01 (3) Å), the dihedral angle between the O16/O14/Cu1/O16'/O14'/Cu1' plane and the BFP ring is 24.51 (4)°.
In the crystal structure, the complexes are linked by C—H···O interactions (H···O = 2.41–2.42 Å and C···O = 3.210 (3)–3.364 (3) Å] to form zigzag layers parallel to the ab plane.