The structure of the title compound, {[Cu(C
2O
4)(H
2O)
2]·H
2O}
n, may be described as a one-dimensional zigzag chain, constructed of alternating bis-bidentate-bridged Cu atoms and oxalate groups. Two thirds of the water molecules coordinate to Cu atoms, and the rest are present as uncoordinated solvent. Intermolecular O—H
O hydrogen bonds link the molecules to form a three-dimensional supramolecular structure. The Cu atom and the uncoordinated water molecule lie on twofold rotation axes, and the oxalate ligand lies on an inversion centre.
Supporting information
CCDC reference: 636686
Key indicators
- Single-crystal X-ray study
- T = 294 K
- Mean (C-C) = 0.006 Å
- R factor = 0.069
- wR factor = 0.184
- Data-to-parameter ratio = 12.7
checkCIF/PLATON results
No syntax errors found
Alert level B
PLAT369_ALERT_2_B Long C(sp2)-C(sp2) Bond C1 - C1_b ... 1.57 Ang.
0 ALERT level A = In general: serious problem
1 ALERT level B = Potentially serious problem
0 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
1 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
0 ALERT type 5 Informative message, check
Data collection: SMART (Bruker, 2000); cell refinement: SAINT-Plus (Bruker, 2000); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXTL (Bruker, 2000); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Poly[diaqua-µ-oxalato-copper(II) monohydrate]
top
Crystal data top
[Cu(C2O4)(H2O)2]·H2O | F(000) = 412 |
Mr = 205.61 | Dx = 2.019 Mg m−3 |
Orthorhombic, Pcca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2a 2ac | Cell parameters from 812 reflections |
a = 9.760 (2) Å | θ = 3.1–27.4° |
b = 6.6015 (16) Å | µ = 3.21 mm−1 |
c = 10.500 (3) Å | T = 294 K |
V = 676.5 (3) Å3 | Needle, blue |
Z = 4 | 0.35 × 0.10 × 0.06 mm |
Data collection top
Bruker SMART APEX CCD area-detector diffractometer | 590 independent reflections |
Radiation source: fine-focus sealed tube | 514 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.089 |
φ and ω scans | θmax = 25.1°, θmin = 3.1° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −10→11 |
Tmin = 0.658, Tmax = 0.827 | k = −6→7 |
1731 measured reflections | l = −12→12 |
Refinement top
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)] = 0.070 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.184 | H-atom parameters constrained |
S = 1.62 | w = 1/[σ2(Fo2) + (0.0298P)2 + 5.9975P] where P = (Fo2 + 2Fc2)/3 |
590 reflections | (Δ/σ)max < 0.001 |
47 parameters | Δρmax = 0.86 e Å−3 |
0 restraints | Δρmin = −1.19 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 | 0.2500 | 0.5000 | 0.14098 (15) | 0.0292 (6) | |
C1 | −0.0185 (3) | 0.3935 (6) | 0.0290 (4) | 0.0192 (17) | |
O1 | 0.0679 (6) | 0.3185 (9) | 0.1019 (5) | 0.0191 (14) | |
O2 | 0.1318 (5) | 0.6785 (8) | 0.0017 (5) | 0.0138 (13) | |
O3 | 0.1864 (6) | 0.7005 (9) | 0.2926 (5) | 0.0225 (14) | |
O4 | 0.0000 | −0.0102 (13) | 0.2500 | 0.0175 (18) | |
H3B | 0.1584 | 0.8266 | 0.2572 | 0.026* | |
H3A | 0.2622 | 0.7209 | 0.3497 | 0.026* | |
H4A | 0.0302 | 0.0734 | 0.1806 | 0.026* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Cu1 | 0.0267 (10) | 0.0344 (11) | 0.0265 (10) | 0.0005 (8) | 0.000 | 0.000 |
C1 | 0.022 (4) | 0.019 (4) | 0.016 (3) | 0.001 (3) | −0.010 (3) | 0.000 (3) |
O1 | 0.015 (3) | 0.018 (3) | 0.025 (3) | −0.003 (3) | −0.007 (3) | 0.012 (3) |
O2 | 0.012 (3) | 0.017 (3) | 0.012 (3) | −0.004 (2) | −0.002 (2) | 0.004 (2) |
O3 | 0.027 (3) | 0.023 (3) | 0.017 (3) | 0.015 (3) | −0.005 (3) | −0.005 (3) |
O4 | 0.023 (4) | 0.010 (4) | 0.019 (4) | 0.000 | 0.004 (3) | 0.000 |
Geometric parameters (Å, º) top
Cu1—O3 | 2.162 (6) | C1—O1 | 1.242 (8) |
Cu1—O3i | 2.162 (6) | C1—O2ii | 1.246 (8) |
Cu1—O1 | 2.182 (5) | C1—C1ii | 1.574 (6) |
Cu1—O1i | 2.182 (5) | O3—H3B | 0.9600 |
Cu1—O2i | 2.204 (5) | O3—H3A | 0.9600 |
Cu1—O2 | 2.204 (5) | O4—H4A | 0.9600 |
| | | |
O3—Cu1—O3i | 85.1 (3) | O1—Cu1—O2 | 75.1 (2) |
O3—Cu1—O1 | 103.9 (2) | O1i—Cu1—O2 | 90.5 (2) |
O3i—Cu1—O1 | 92.1 (2) | O2i—Cu1—O2 | 96.9 (3) |
O3—Cu1—O1i | 92.1 (2) | O1—C1—O2ii | 127.6 (7) |
O3i—Cu1—O1i | 103.9 (2) | O1—C1—C1ii | 116.0 (8) |
O1—Cu1—O1i | 158.3 (3) | O2ii—C1—C1ii | 116.3 (8) |
O3—Cu1—O2i | 165.1 (2) | C1—O1—Cu1 | 116.7 (5) |
O3i—Cu1—O2i | 90.6 (2) | C1ii—O2—Cu1 | 115.6 (5) |
O1—Cu1—O2i | 90.5 (2) | Cu1—O3—H3B | 109.2 |
O1i—Cu1—O2i | 75.1 (2) | Cu1—O3—H3A | 108.9 |
O3—Cu1—O2 | 90.6 (2) | H3B—O3—H3A | 110.0 |
O3i—Cu1—O2 | 165.1 (2) | | |
| | | |
O2ii—C1—O1—Cu1 | −176.4 (6) | O2—Cu1—O1—C1 | −3.1 (5) |
C1ii—C1—O1—Cu1 | 2.1 (10) | O3—Cu1—O2—C1ii | −100.5 (5) |
O3—Cu1—O1—C1 | 83.8 (6) | O3i—Cu1—O2—C1ii | −27.4 (11) |
O3i—Cu1—O1—C1 | 169.3 (6) | O1—Cu1—O2—C1ii | 3.8 (5) |
O1i—Cu1—O1—C1 | −52.7 (5) | O1i—Cu1—O2—C1ii | 167.4 (5) |
O2i—Cu1—O1—C1 | −100.1 (6) | O2i—Cu1—O2—C1ii | 92.4 (5) |
Symmetry codes: (i) −x+1/2, −y+1, z; (ii) −x, −y+1, −z. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3B···O4iii | 0.96 | 1.89 | 2.675 (8) | 139 |
O3—H3A···O2iv | 0.96 | 1.92 | 2.827 (8) | 156 |
O4—H4A···O1 | 0.96 | 1.85 | 2.751 (9) | 154 |
Symmetry codes: (iii) x, y+1, z; (iv) −x+1/2, y, z+1/2. |