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The crystal structure of the title compound, [Cu2(C2O4)2(C2H3N3)2(H2O)4], consists of dimeric neutral entities with D2 (222) point symmetry. The two CuII atoms (site symmetry 2) are linked by two symmetry-related N1,N2-bidentate 1,2,4-triazole bridges (one of the N atoms has site symmetry 2). The distorted octahedral coordination around each Cu atom is completed by two O donor atoms from a terminal bidentate oxalate ligand in the equatorial plane, and two trans-coordinated water molecules occupying the apical positions with longer metal–oxygen distances. The complete solid-state structure can be described as a three-dimensional supramolecular framework, stabilized by extensive hydrogen-bonding interactions involving the water molecules, the non-coordinated oxalate O atoms and the protonated N atom of the triazole ligands. The thermal degradation of the title compound was carried out in air between 298 and 873 K.
Supporting information
CCDC reference: 231802
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean (C-C) = 0.005 Å
- R factor = 0.041
- wR factor = 0.116
- Data-to-parameter ratio = 18.6
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT250_ALERT_2_C Large U3/U1 ratio for average U(i,j) tensor .... 2.11
PLAT369_ALERT_2_C Long C(sp2)-C(sp2) Bond C1 - C1_c = 1.56 Ang.
PLAT432_ALERT_2_C Short Inter X...Y Contact C1 .. C1 = 3.15 Ang.
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
3 ALERT level C = Check and explain
0 ALERT level G = General alerts; check
0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
3 ALERT type 2 Indicator that the structure model may be wrong or deficient
0 ALERT type 3 Indicator that the structure quality may be low
0 ALERT type 4 Improvement, methodology, query or suggestion
Data collection: CrysAlis CCD (Oxford Diffraction, 2003); cell refinement: CrysAlis CCD; data reduction: CrysAlis RED (Oxford Diffraction, 2003); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Bis(µ-1,2,4-triazole-
κ2N1:
N2)bis[aqua(oxalato-
κ2O,
O')copper(II)]
top
Crystal data top
[Cu2(C2O4)2(C2H3N3)2(H2O)4] | Dx = 2.064 Mg m−3 Dm = 2.05 (1) Mg m−3 Dm measured by flotation in a mixture of carbon tetrachloride and bromoform |
Mr = 513.35 | Mo Kα radiation, λ = 0.71073 Å |
Tetragonal, I41/acd | Cell parameters from 13778 reflections |
Hall symbol: -I 4bd 2c | θ = 2.5–25.8° |
a = 16.596 (1) Å | µ = 2.66 mm−1 |
c = 11.996 (2) Å | T = 293 K |
V = 3304.0 (6) Å3 | Prism, blue |
Z = 8 | 0.42 × 0.20 × 0.08 mm |
F(000) = 2064 | |
Data collection top
Xcalibur diffractometer | 652 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.070 |
ω scans | θmax = 30.0°, θmin = 3.2° |
Absorption correction: numerical CrysAlis RED (Oxford Diffraction, 2003) | h = −23→23 |
Tmin = 0.534, Tmax = 0.809 | k = −23→23 |
13778 measured reflections | l = −16→16 |
1212 independent reflections | |
Refinement top
Refinement on F2 | Primary atom site location: heavy-atom method |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.041 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.116 | H-atom parameters not refined |
S = 0.98 | w = 1/[σ2(Fo2) + (0.0549P)2] where P = (Fo2 + 2Fc2)/3 |
1212 reflections | (Δ/σ)max = 0.001 |
65 parameters | Δρmax = 0.50 e Å−3 |
0 restraints | Δρmin = −0.55 e Å−3 |
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 | x | y | z | Uiso*/Ueq | |
Cu1 | 0.91613 (2) | 0.16613 (2) | 0.1250 | 0.0264 (2) | |
O1 | 0.7976 (1) | 0.1593 (1) | 0.1352 (2) | 0.0290 (6) | |
O2 | 0.7013 (1) | 0.0664 (1) | 0.1278 (2) | 0.0309 (6) | |
O3w | 0.9167 (2) | 0.1755 (2) | −0.0816 (2) | 0.0336 (6) | |
N1 | 1.0363 (2) | 0.1557 (2) | 0.1219 (3) | 0.0208 (6) | |
N3 | 1.1525 (2) | 0.0975 (2) | 0.1250 | 0.0250 (9) | |
C1 | 0.7718 (2) | 0.0882 (2) | 0.1279 (3) | 0.0245 (7) | |
C2 | 1.0740 (2) | 0.0864 (2) | 0.1199 (3) | 0.0286 (8) | |
H2 | 1.047 | 0.041 | 0.127 | 0.05* | |
H3 | 1.186 | 0.064 | 0.1250 | 0.05* | |
H31 | 0.969 | 0.157 | −0.112 | 0.05* | |
H32 | 0.892 | 0.129 | −0.095 | 0.05* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Cu1 | 0.0157 (2) | 0.0157 (2) | 0.0477 (4) | −0.0014 (3) | 0.0003 (2) | −0.0003 (2) |
O1 | 0.018 (1) | 0.017 (1) | 0.052 (2) | −0.000 (1) | 0.001 (1) | 0.001 (1) |
O2 | 0.018 (1) | 0.023 (1) | 0.051 (2) | −0.004 (1) | −0.002 (1) | 0.002 (1) |
O3w | 0.029 (2) | 0.032 (2) | 0.040 (2) | −0.002 (1) | 0.000 (1) | 0.001 (1) |
N1 | 0.017 (1) | 0.013 (1) | 0.033 (2) | −0.002 (1) | 0.001 (1) | 0.000 (1) |
N3 | 0.019 (1) | 0.019 (1) | 0.037 (2) | 0.010 (2) | −0.003 (2) | −0.003 (2) |
C1 | 0.023 (2) | 0.021 (2) | 0.029 (2) | −0.002 (1) | 0.000 (2) | 0.005 (2) |
C2 | 0.024 (2) | 0.018 (2) | 0.044 (2) | 0.002 (1) | −0.005 (2) | −0.003 (2) |
Geometric parameters (Å, º) top
Cu1—O1 | 1.975 (2) | O3w—H32 | 0.89 |
Cu1—N1 | 2.002 (3) | N1—N1ii | 1.364 (5) |
Cu1—O3w | 2.483 (3) | N1—C2 | 1.309 (4) |
Cu1—O1i | 1.975 (2) | N3—C2 | 1.318 (4) |
Cu1—N1i | 2.002 (3) | N3—C2ii | 1.318 (4) |
Cu1—O3wi | 2.483 (3) | C1—C1i | 1.560 (7) |
O1—C1 | 1.259 (4) | C2—H2 | 0.88 |
O2—C1 | 1.224 (4) | N3—H3 | 0.78 |
O3w—H31 | 0.99 | | |
| | | |
O1—Cu1—O1i | 83.7 (1) | N1i—Cu1—O3wi | 89.1 (1) |
O1—Cu1—N1 | 171.4 (1) | N1i—Cu1—O3w | 87.5 (1) |
O1—Cu1—N1i | 88.3 (1) | H31—O3w—H32 | 93.9 |
O1—Cu1—O3w | 94.0 (1) | O1—C1—O2 | 127.0 (3) |
O1—Cu1—O3wi | 90.1 (1) | O1—C1—C1i | 115.2 (2) |
N1—Cu1—N1i | 100.0 (1) | O2—C1—C1i | 117.8 (2) |
N1—Cu1—O3w | 89.1 (1) | N1—C2—N3 | 110.5 (3) |
N1—Cu1—O3wi | 87.5 (1) | C2—N1—N1ii | 106.5 (2) |
O3w—Cu1—O3wi | 174.6 (1) | C2—N3—C2ii | 106.1 (4) |
O1i—Cu1—N1i | 171.4 (1) | N1—C2—H2 | 121.0 |
O1i—Cu1—N1 | 88.3 (1) | C2—N3—H3 | 127.0 |
O1i—Cu1—O3wi | 94.0 (1) | C2ii—N3—H3 | 127.0 |
O1i—Cu1—O3w | 90.1 (1) | N3—C2—H2 | 127.6 |
Symmetry codes: (i) y+3/4, x−3/4, −z+1/4; (ii) −y+5/4, −x+5/4, −z+1/4. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3···O2iii | 0.78 | 2.18 | 2.838 (4) | 142 |
N3—H3···O2iv | 0.78 | 2.18 | 2.838 (4) | 142 |
O3w—H32···O2v | 0.89 | 1.91 | 2.724 (3) | 152 |
O3w—H31···O3wvi | 0.99 | 1.88 | 2.822 (4) | 157 |
Symmetry codes: (iii) x+1/2, −y, z; (iv) y+5/4, −x+3/4, −z+1/4; (v) −x+3/2, y, −z; (vi) −y+5/4, x−3/4, −z−1/4. |
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