metal-organic compounds
{N,N′-Bis[1-(pyridin-2-yl)ethylidene]propane-1,3-diamine}bromidocopper(II) tetrafluoridoborate
aExperimental Center, Linyi University, Linyi Shandong 276005, People's Republic of China
*Correspondence e-mail: xiaoerduoaa@hotmail.com
In the title compound, [CuBr(C17H20N4)]BF4, the CuII ion is five-coordinated by the four N atoms of the tetradentate Schiff base ligand and by one bromide ion, thereby forming a square-pyramidal CuN4Br coordination geometry. The dihedral angle between the pyridine rings of the Schiff base is 54.39 (18)°. In the crystal, the components are linked by C—H⋯F interactions.
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2004); cell SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
10.1107/S1600536811022513/hb5900sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811022513/hb5900Isup2.hkl
2-Acetylpyridine (0.2 mmol, 24.2 mg), propane-1,3-diamine (0.1 mmol, 7.4 mg), copper bromide (0.1 mmol, 22.3 mg), and ammonium fluoroborate (0.1 mmol, 10.5 mg) were mixed and stirred in methanol (20 ml) at reflux for 2 h, to give a blue solution. The solution was cooled to room temperature, and blue block-shaped single crystals of (I) were formed by slow evaporation of the solution in air.
H atoms were positioned geometrically (C–H = 0.93–0.97 Å) and refined using a riding model, with Uiso(H) = 1.2Ueq(C) and 1.5Ueq(Cmethyl).
Data collection: APEX2 (Bruker, 2004); cell
SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[CuBr(C17H20N4)]BF4 | Z = 2 |
Mr = 510.63 | F(000) = 510 |
Triclinic, P1 | Dx = 1.765 Mg m−3 |
a = 8.2508 (17) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 8.9511 (18) Å | Cell parameters from 1747 reflections |
c = 13.158 (3) Å | θ = 2.5–25.3° |
α = 92.391 (2)° | µ = 3.26 mm−1 |
β = 94.847 (2)° | T = 298 K |
γ = 96.422 (2)° | Block, blue |
V = 960.9 (3) Å3 | 0.27 × 0.27 × 0.23 mm |
Bruker APEXII CCD diffractometer | 3683 independent reflections |
Radiation source: fine-focus sealed tube | 2723 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.026 |
ω scans | θmax = 26.0°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2004) | h = −9→10 |
Tmin = 0.473, Tmax = 0.521 | k = −11→10 |
5958 measured reflections | l = −16→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)] = 0.038 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.087 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0353P)2 + 0.1409P] where P = (Fo2 + 2Fc2)/3 |
3683 reflections | (Δ/σ)max = 0.001 |
255 parameters | Δρmax = 0.39 e Å−3 |
0 restraints | Δρmin = −0.46 e Å−3 |
[CuBr(C17H20N4)]BF4 | γ = 96.422 (2)° |
Mr = 510.63 | V = 960.9 (3) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.2508 (17) Å | Mo Kα radiation |
b = 8.9511 (18) Å | µ = 3.26 mm−1 |
c = 13.158 (3) Å | T = 298 K |
α = 92.391 (2)° | 0.27 × 0.27 × 0.23 mm |
β = 94.847 (2)° |
Bruker APEXII CCD diffractometer | 3683 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2004) | 2723 reflections with I > 2σ(I) |
Tmin = 0.473, Tmax = 0.521 | Rint = 0.026 |
5958 measured reflections |
R[F2 > 2σ(F2)] = 0.038 | 0 restraints |
wR(F2) = 0.087 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.39 e Å−3 |
3683 reflections | Δρmin = −0.46 e Å−3 |
255 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 | ||
Cu1 | 0.90467 (5) | 0.78988 (5) | 0.74936 (3) | 0.03382 (14) | |
Br1 | 1.14320 (5) | 0.95979 (5) | 0.69040 (3) | 0.04830 (14) | |
F1 | 0.5630 (4) | 0.4076 (3) | 0.2862 (2) | 0.0787 (8) | |
F2 | 0.4093 (3) | 0.5940 (3) | 0.2543 (2) | 0.0754 (8) | |
F3 | 0.6555 (3) | 0.5941 (3) | 0.1938 (2) | 0.0870 (9) | |
F4 | 0.4467 (4) | 0.4290 (3) | 0.1279 (2) | 0.0792 (8) | |
N1 | 0.9085 (3) | 0.5870 (3) | 0.6691 (2) | 0.0318 (7) | |
N2 | 0.7458 (4) | 0.8146 (3) | 0.6317 (2) | 0.0370 (7) | |
N3 | 0.7643 (3) | 0.8783 (3) | 0.8484 (2) | 0.0339 (7) | |
N4 | 1.0231 (3) | 0.7455 (3) | 0.8815 (2) | 0.0343 (7) | |
B1 | 0.5174 (6) | 0.5077 (5) | 0.2150 (4) | 0.0410 (11) | |
C1 | 0.8099 (4) | 0.5758 (4) | 0.5809 (3) | 0.0333 (8) | |
C2 | 0.7912 (5) | 0.4481 (4) | 0.5165 (3) | 0.0410 (10) | |
H2 | 0.7238 | 0.4432 | 0.4558 | 0.049* | |
C3 | 0.8740 (5) | 0.3273 (4) | 0.5435 (3) | 0.0490 (11) | |
H3 | 0.8628 | 0.2403 | 0.5011 | 0.059* | |
C4 | 0.9726 (5) | 0.3373 (4) | 0.6333 (3) | 0.0463 (10) | |
H4 | 1.0284 | 0.2570 | 0.6530 | 0.056* | |
C5 | 0.9879 (5) | 0.4694 (4) | 0.6942 (3) | 0.0388 (9) | |
H5 | 1.0558 | 0.4764 | 0.7548 | 0.047* | |
C6 | 0.7252 (4) | 0.7110 (4) | 0.5613 (3) | 0.0338 (8) | |
C7 | 0.6216 (5) | 0.7181 (5) | 0.4626 (3) | 0.0549 (12) | |
H7A | 0.5098 | 0.7227 | 0.4763 | 0.082* | |
H7B | 0.6287 | 0.6299 | 0.4198 | 0.082* | |
H7C | 0.6602 | 0.8062 | 0.4285 | 0.082* | |
C8 | 0.6550 (5) | 0.9469 (4) | 0.6228 (3) | 0.0506 (11) | |
H8A | 0.5399 | 0.9130 | 0.6050 | 0.061* | |
H8B | 0.6943 | 1.0060 | 0.5678 | 0.061* | |
C9 | 0.6728 (5) | 1.0446 (4) | 0.7192 (3) | 0.0496 (11) | |
H9A | 0.6033 | 1.1245 | 0.7103 | 0.060* | |
H9B | 0.7852 | 1.0911 | 0.7308 | 0.060* | |
C10 | 0.6290 (5) | 0.9614 (5) | 0.8124 (3) | 0.0478 (11) | |
H10A | 0.6076 | 1.0324 | 0.8660 | 0.057* | |
H10B | 0.5305 | 0.8919 | 0.7956 | 0.057* | |
C11 | 0.7903 (4) | 0.8446 (4) | 0.9409 (3) | 0.0339 (8) | |
C12 | 0.6860 (5) | 0.8754 (5) | 1.0249 (3) | 0.0546 (12) | |
H12A | 0.7435 | 0.9522 | 1.0718 | 0.082* | |
H12B | 0.6614 | 0.7850 | 1.0601 | 0.082* | |
H12C | 0.5860 | 0.9089 | 0.9966 | 0.082* | |
C13 | 0.9414 (4) | 0.7715 (4) | 0.9639 (3) | 0.0316 (8) | |
C14 | 0.9996 (5) | 0.7370 (5) | 1.0603 (3) | 0.0447 (10) | |
H14 | 0.9410 | 0.7538 | 1.1163 | 0.054* | |
C15 | 1.1478 (5) | 0.6765 (5) | 1.0722 (3) | 0.0492 (11) | |
H15 | 1.1893 | 0.6518 | 1.1364 | 0.059* | |
C16 | 1.2322 (5) | 0.6535 (4) | 0.9889 (3) | 0.0434 (10) | |
H16 | 1.3313 | 0.6130 | 0.9960 | 0.052* | |
C17 | 1.1684 (4) | 0.6912 (4) | 0.8944 (3) | 0.0403 (9) | |
H17 | 1.2275 | 0.6788 | 0.8381 | 0.048* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cu1 | 0.0384 (3) | 0.0369 (3) | 0.0276 (3) | 0.0138 (2) | −0.00162 (19) | 0.00188 (19) |
Br1 | 0.0507 (3) | 0.0410 (3) | 0.0523 (3) | −0.00041 (19) | 0.0050 (2) | 0.00788 (19) |
F1 | 0.103 (2) | 0.0687 (19) | 0.0661 (19) | 0.0260 (16) | −0.0107 (16) | 0.0165 (15) |
F2 | 0.0599 (16) | 0.101 (2) | 0.0701 (18) | 0.0396 (16) | 0.0013 (14) | −0.0089 (16) |
F3 | 0.0684 (19) | 0.080 (2) | 0.112 (3) | −0.0095 (16) | 0.0233 (17) | 0.0126 (18) |
F4 | 0.096 (2) | 0.0772 (19) | 0.0576 (18) | 0.0063 (16) | −0.0192 (15) | −0.0198 (15) |
N1 | 0.0362 (17) | 0.0312 (17) | 0.0286 (17) | 0.0035 (13) | 0.0064 (13) | 0.0045 (13) |
N2 | 0.0417 (19) | 0.0374 (19) | 0.0320 (18) | 0.0093 (15) | −0.0039 (14) | 0.0064 (15) |
N3 | 0.0322 (17) | 0.0351 (17) | 0.0354 (18) | 0.0110 (13) | 0.0012 (14) | −0.0001 (14) |
N4 | 0.0341 (17) | 0.0398 (18) | 0.0299 (17) | 0.0095 (14) | 0.0001 (14) | 0.0019 (14) |
B1 | 0.041 (3) | 0.043 (3) | 0.038 (3) | 0.010 (2) | −0.003 (2) | −0.003 (2) |
C1 | 0.033 (2) | 0.035 (2) | 0.031 (2) | −0.0037 (16) | 0.0076 (16) | 0.0049 (17) |
C2 | 0.039 (2) | 0.043 (2) | 0.039 (2) | −0.0075 (18) | 0.0090 (18) | −0.0057 (19) |
C3 | 0.058 (3) | 0.034 (2) | 0.055 (3) | −0.009 (2) | 0.026 (2) | −0.011 (2) |
C4 | 0.056 (3) | 0.030 (2) | 0.058 (3) | 0.0101 (19) | 0.024 (2) | 0.008 (2) |
C5 | 0.046 (2) | 0.038 (2) | 0.035 (2) | 0.0116 (18) | 0.0108 (18) | 0.0052 (18) |
C6 | 0.0279 (19) | 0.045 (2) | 0.028 (2) | −0.0011 (16) | 0.0007 (15) | 0.0060 (18) |
C7 | 0.054 (3) | 0.065 (3) | 0.042 (3) | 0.004 (2) | −0.014 (2) | 0.001 (2) |
C8 | 0.061 (3) | 0.045 (3) | 0.047 (3) | 0.020 (2) | −0.008 (2) | 0.009 (2) |
C9 | 0.058 (3) | 0.040 (2) | 0.054 (3) | 0.025 (2) | −0.002 (2) | 0.008 (2) |
C10 | 0.042 (2) | 0.049 (3) | 0.056 (3) | 0.024 (2) | 0.003 (2) | 0.003 (2) |
C11 | 0.036 (2) | 0.033 (2) | 0.034 (2) | 0.0071 (16) | 0.0058 (17) | 0.0003 (17) |
C12 | 0.053 (3) | 0.071 (3) | 0.045 (3) | 0.023 (2) | 0.015 (2) | 0.003 (2) |
C13 | 0.0322 (19) | 0.032 (2) | 0.030 (2) | 0.0042 (16) | −0.0006 (16) | −0.0007 (16) |
C14 | 0.048 (2) | 0.058 (3) | 0.030 (2) | 0.010 (2) | 0.0038 (18) | 0.0015 (19) |
C15 | 0.056 (3) | 0.058 (3) | 0.034 (2) | 0.014 (2) | −0.010 (2) | 0.010 (2) |
C16 | 0.039 (2) | 0.052 (3) | 0.040 (2) | 0.0129 (19) | −0.0053 (19) | 0.0042 (19) |
C17 | 0.037 (2) | 0.047 (2) | 0.039 (2) | 0.0144 (18) | 0.0048 (18) | 0.0019 (18) |
Cu1—N2 | 1.978 (3) | C6—C7 | 1.501 (5) |
Cu1—N4 | 1.998 (3) | C7—H7A | 0.9600 |
Cu1—N3 | 2.010 (3) | C7—H7B | 0.9600 |
Cu1—N1 | 2.067 (3) | C7—H7C | 0.9600 |
Cu1—Br1 | 2.5447 (7) | C8—C9 | 1.498 (6) |
F1—B1 | 1.381 (5) | C8—H8A | 0.9700 |
F2—B1 | 1.363 (5) | C8—H8B | 0.9700 |
F3—B1 | 1.360 (5) | C9—C10 | 1.511 (5) |
F4—B1 | 1.370 (5) | C9—H9A | 0.9700 |
N1—C5 | 1.339 (4) | C9—H9B | 0.9700 |
N1—C1 | 1.354 (4) | C10—H10A | 0.9700 |
N2—C6 | 1.270 (4) | C10—H10B | 0.9700 |
N2—C8 | 1.474 (4) | C11—C13 | 1.486 (5) |
N3—C11 | 1.272 (4) | C11—C12 | 1.492 (5) |
N3—C10 | 1.467 (4) | C12—H12A | 0.9600 |
N4—C17 | 1.343 (4) | C12—H12B | 0.9600 |
N4—C13 | 1.349 (4) | C12—H12C | 0.9600 |
C1—C2 | 1.381 (5) | C13—C14 | 1.378 (5) |
C1—C6 | 1.485 (5) | C14—C15 | 1.392 (5) |
C2—C3 | 1.385 (5) | C14—H14 | 0.9300 |
C2—H2 | 0.9300 | C15—C16 | 1.367 (5) |
C3—C4 | 1.371 (6) | C15—H15 | 0.9300 |
C3—H3 | 0.9300 | C16—C17 | 1.380 (5) |
C4—C5 | 1.388 (5) | C16—H16 | 0.9300 |
C4—H4 | 0.9300 | C17—H17 | 0.9300 |
C5—H5 | 0.9300 | ||
N2—Cu1—N4 | 167.79 (12) | C6—C7—H7B | 109.5 |
N2—Cu1—N3 | 92.15 (12) | H7A—C7—H7B | 109.5 |
N4—Cu1—N3 | 79.82 (12) | C6—C7—H7C | 109.5 |
N2—Cu1—N1 | 80.08 (12) | H7A—C7—H7C | 109.5 |
N4—Cu1—N1 | 99.56 (12) | H7B—C7—H7C | 109.5 |
N3—Cu1—N1 | 137.46 (11) | N2—C8—C9 | 112.8 (3) |
N2—Cu1—Br1 | 96.74 (9) | N2—C8—H8A | 109.0 |
N4—Cu1—Br1 | 95.17 (9) | C9—C8—H8A | 109.0 |
N3—Cu1—Br1 | 118.16 (9) | N2—C8—H8B | 109.0 |
N1—Cu1—Br1 | 104.32 (8) | C9—C8—H8B | 109.0 |
C5—N1—C1 | 118.4 (3) | H8A—C8—H8B | 107.8 |
C5—N1—Cu1 | 129.4 (2) | C8—C9—C10 | 113.9 (4) |
C1—N1—Cu1 | 112.2 (2) | C8—C9—H9A | 108.8 |
C6—N2—C8 | 120.0 (3) | C10—C9—H9A | 108.8 |
C6—N2—Cu1 | 117.1 (2) | C8—C9—H9B | 108.8 |
C8—N2—Cu1 | 122.9 (3) | C10—C9—H9B | 108.8 |
C11—N3—C10 | 123.0 (3) | H9A—C9—H9B | 107.7 |
C11—N3—Cu1 | 115.8 (2) | N3—C10—C9 | 109.7 (3) |
C10—N3—Cu1 | 120.8 (2) | N3—C10—H10A | 109.7 |
C17—N4—C13 | 119.2 (3) | C9—C10—H10A | 109.7 |
C17—N4—Cu1 | 126.9 (2) | N3—C10—H10B | 109.7 |
C13—N4—Cu1 | 113.8 (2) | C9—C10—H10B | 109.7 |
F3—B1—F2 | 110.9 (4) | H10A—C10—H10B | 108.2 |
F3—B1—F4 | 109.5 (4) | N3—C11—C13 | 114.8 (3) |
F2—B1—F4 | 110.2 (4) | N3—C11—C12 | 125.8 (3) |
F3—B1—F1 | 107.5 (3) | C13—C11—C12 | 119.4 (3) |
F2—B1—F1 | 109.3 (4) | C11—C12—H12A | 109.5 |
F4—B1—F1 | 109.3 (4) | C11—C12—H12B | 109.5 |
N1—C1—C2 | 121.8 (3) | H12A—C12—H12B | 109.5 |
N1—C1—C6 | 114.1 (3) | C11—C12—H12C | 109.5 |
C2—C1—C6 | 124.1 (3) | H12A—C12—H12C | 109.5 |
C1—C2—C3 | 119.1 (4) | H12B—C12—H12C | 109.5 |
C1—C2—H2 | 120.4 | N4—C13—C14 | 121.6 (3) |
C3—C2—H2 | 120.4 | N4—C13—C11 | 114.1 (3) |
C4—C3—C2 | 119.3 (4) | C14—C13—C11 | 124.3 (3) |
C4—C3—H3 | 120.4 | C13—C14—C15 | 118.5 (4) |
C2—C3—H3 | 120.4 | C13—C14—H14 | 120.7 |
C3—C4—C5 | 118.9 (4) | C15—C14—H14 | 120.7 |
C3—C4—H4 | 120.6 | C16—C15—C14 | 119.7 (4) |
C5—C4—H4 | 120.6 | C16—C15—H15 | 120.1 |
N1—C5—C4 | 122.5 (4) | C14—C15—H15 | 120.1 |
N1—C5—H5 | 118.8 | C15—C16—C17 | 119.1 (4) |
C4—C5—H5 | 118.8 | C15—C16—H16 | 120.4 |
N2—C6—C1 | 116.3 (3) | C17—C16—H16 | 120.4 |
N2—C6—C7 | 124.1 (4) | N4—C17—C16 | 121.7 (3) |
C1—C6—C7 | 119.6 (3) | N4—C17—H17 | 119.2 |
C6—C7—H7A | 109.5 | C16—C17—H17 | 119.2 |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2···F1 | 0.93 | 2.49 | 3.413 (5) | 173 |
C12—H12B···F3i | 0.96 | 2.50 | 3.430 (5) | 162 |
C15—H15···F2ii | 0.93 | 2.40 | 3.252 (5) | 152 |
Symmetry codes: (i) x, y, z+1; (ii) x+1, y, z+1. |
Experimental details
Crystal data | |
Chemical formula | [CuBr(C17H20N4)]BF4 |
Mr | 510.63 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 298 |
a, b, c (Å) | 8.2508 (17), 8.9511 (18), 13.158 (3) |
α, β, γ (°) | 92.391 (2), 94.847 (2), 96.422 (2) |
V (Å3) | 960.9 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 3.26 |
Crystal size (mm) | 0.27 × 0.27 × 0.23 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2004) |
Tmin, Tmax | 0.473, 0.521 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5958, 3683, 2723 |
Rint | 0.026 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.038, 0.087, 1.05 |
No. of reflections | 3683 |
No. of parameters | 255 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.39, −0.46 |
Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
Cu1—N2 | 1.978 (3) | Cu1—N1 | 2.067 (3) |
Cu1—N4 | 1.998 (3) | Cu1—Br1 | 2.5447 (7) |
Cu1—N3 | 2.010 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2···F1 | 0.93 | 2.49 | 3.413 (5) | 173 |
C12—H12B···F3i | 0.96 | 2.50 | 3.430 (5) | 162 |
C15—H15···F2ii | 0.93 | 2.40 | 3.252 (5) | 152 |
Symmetry codes: (i) x, y, z+1; (ii) x+1, y, z+1. |
Acknowledgements
The author thanks the Experimental Center of Linyi University for supporting this work.
References
Bruker (2004). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Liu, L.-J. (2011). Acta Cryst. E67, m876–m877. Web of Science CSD CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2004). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
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As a continuation of our work on the Schiff base copper(II) complexes (Liu, 2011), the title new copper complex, (I), is reported.
The title compound contains a mononuclear copper(II) complex cation and a fluoroborate anion, Fig. 1. The CuII atom in the complex is five-coordinated by the four N atoms of the Schiff base ligand, and by one bromide ion, forming a square-pyramidal geometry. The bond lengths (Table 1) related to the Cu atom are comparable with those observed in similar copper complexes with square-pyramidal geometry (Liu, 2011).