The title compound, C
5H
10N
2O
2, has twofold crystallographic symmetry. A set of four molecules packs around a
center to form a 12-membered ring that is constructed from four O—H
N hydrogen bonds.
Supporting information
CCDC reference: 226952
Key indicators
- Single-crystal X-ray study
- T = 130 K
- Mean (C-C) = 0.003 Å
- R factor = 0.028
- wR factor = 0.078
- Data-to-parameter ratio = 9.5
checkCIF/PLATON results
No syntax errors found
Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
correct. If it is not, please give the correct count in the
_publ_section_exptl_refinement section of the submitted CIF.
From the CIF: _diffrn_reflns_theta_max 66.82
From the CIF: _reflns_number_total 598
Count of symmetry unique reflns 372
Completeness (_total/calc) 160.75%
TEST3: Check Friedels for noncentro structure
Estimate of Friedel pairs measured 226
Fraction of Friedel pairs measured 0.608
Are heavy atom types Z>Si present no
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
0 ALERT level C = Check and explain
1 ALERT level G = General alerts; check
0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 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
1 ALERT type 4 Improvement, methodology, query or suggestion
Data collection: P3-PC (Siemens, 1991); cell refinement: P3-PC; data reduction: XDISK (Siemens, 1991); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Sheldrick, 1994); software used to prepare material for publication: SHELXL97.
pentane-2,4-dione dioxime
top
Crystal data top
C5H10N2O2 | Dx = 1.229 Mg m−3 |
Mr = 130.15 | Cu Kα radiation, λ = 1.54178 Å |
Tetragonal, P4n2 | Cell parameters from 48 reflections |
Hall symbol: P -4 -2n | θ = 8.1–27.0° |
a = 10.852 (2) Å | µ = 0.80 mm−1 |
c = 5.9751 (15) Å | T = 130 K |
V = 703.7 (3) Å3 | Block, colorless |
Z = 4 | 0.20 × 0.20 × 0.20 mm |
F(000) = 280 | |
Data collection top
Syntex P21 diffractometer | Rint = 0.022 |
Radiation source: normal-focus sealed tube | θmax = 66.8°, θmin = 5.8° |
Graphite monochromator | h = 0→12 |
2θ–ω scans | k = 0→12 |
777 measured reflections | l = 0→7 |
598 independent reflections | 2 standard reflections every 198 reflections |
577 reflections with I > 2σ(I) | intensity decay: <0.1% |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.028 | All H-atom parameters refined |
wR(F2) = 0.078 | w = 1/[σ2(Fo2) + (0.0428P)2 + 0.1006P] where P = (Fo2 + 2Fc2)/3 |
S = 1.12 | (Δ/σ)max = 0.001 |
598 reflections | Δρmax = 0.13 e Å−3 |
63 parameters | Δρmin = −0.11 e Å−3 |
0 restraints | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.025 (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 | |
O1 | 0.33898 (10) | 0.40570 (10) | 0.2077 (2) | 0.0345 (4) | |
H1 | 0.390 (2) | 0.383 (2) | 0.076 (5) | 0.057 (7)* | |
N1 | 0.31472 (12) | 0.52870 (11) | 0.1520 (3) | 0.0288 (4) | |
C1 | 0.24110 (13) | 0.58023 (13) | 0.2909 (3) | 0.0288 (4) | |
C2 | 0.18573 (18) | 0.51634 (19) | 0.4866 (3) | 0.0393 (5) | |
H2A | 0.122 (2) | 0.565 (2) | 0.557 (5) | 0.065 (8)* | |
H2B | 0.149 (2) | 0.436 (2) | 0.447 (4) | 0.052 (7)* | |
H2C | 0.248 (2) | 0.496 (3) | 0.597 (5) | 0.069 (8)* | |
C3 | 0.21494 (15) | 0.71494 (15) | 0.2500 | 0.0372 (6) | |
H3 | 0.263 (2) | 0.744 (2) | 0.121 (3) | 0.049 (6)* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1 | 0.0378 (7) | 0.0213 (6) | 0.0445 (7) | 0.0055 (4) | 0.0048 (6) | 0.0006 (5) |
N1 | 0.0238 (6) | 0.0206 (7) | 0.0420 (8) | 0.0000 (5) | 0.0015 (6) | −0.0002 (5) |
C1 | 0.0204 (7) | 0.0269 (8) | 0.0392 (10) | −0.0009 (6) | −0.0003 (6) | −0.0053 (7) |
C2 | 0.0398 (10) | 0.0452 (11) | 0.0329 (10) | 0.0068 (9) | 0.0045 (8) | −0.0008 (9) |
C3 | 0.0247 (7) | 0.0247 (7) | 0.0622 (18) | −0.0002 (8) | 0.0055 (8) | −0.0055 (8) |
Geometric parameters (Å, º) top
O1—N1 | 1.4007 (16) | C2—H2A | 0.97 (2) |
O1—H1 | 0.99 (3) | C2—H2B | 0.99 (2) |
N1—C1 | 1.281 (2) | C2—H2C | 0.97 (3) |
C1—C2 | 1.486 (3) | C3—H3 | 0.98 (2) |
C1—C3 | 1.5090 (18) | | |
| | | |
N1—O1—H1 | 99.1 (14) | H2A—C2—H2B | 107 (2) |
C1—N1—O1 | 112.30 (13) | C1—C2—H2C | 111.2 (15) |
N1—C1—C2 | 123.95 (13) | H2A—C2—H2C | 109 (2) |
N1—C1—C3 | 115.81 (13) | H2B—C2—H2C | 104 (2) |
C2—C1—C3 | 120.21 (13) | C1—C3—C1i | 113.00 (18) |
C1—C2—H2A | 112.2 (15) | C1—C3—H3 | 109.7 (14) |
C1—C2—H2B | 112.8 (14) | C1i—C3—H3 | 109.3 (14) |
| | | |
H1—O1—N1—C1 | 175.6 (14) | N1—C1—C3—C1i | 119.77 (15) |
O1—N1—C1—C2 | −1.1 (2) | C2—C1—C3—C1i | −62.04 (13) |
O1—N1—C1—C3 | 177.05 (13) | | |
Symmetry code: (i) y−1/2, x+1/2, −z+1/2. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1ii | 0.99 (3) | 1.78 (3) | 2.767 (2) | 170 (2) |
Symmetry code: (ii) −y+1, x, −z. |