research communications
E)-2-hydroxy-1,2-diphenylethan-1-one oxime
of (aInstitute of Chemistry of New Materials, University of Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany, and bDepartamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Carerra 30 No 45-03, Bogotá, Colombia
*Correspondence e-mail: hreuter@uos.de
The title compound, C14H13NO2, is a commercially available material and can be used as a multidentate ligand. The molecule of the has an R configuration, while the corresponding S-configured molecule of the is generated by a crystallographic centre of symmetry. Both hydroxy groups (the H atom of the oxime group is equally disordered over two positions) are involved in hydrogen bonding, leading to the formation of chains extending parallel to [001].
Keywords: crystal structure; α-benzoinoxime; disorder.
CCDC reference: 1556039
1. Chemical context
The title compound (E)-2-hydroxy-1,2-diphenyl-ethan-1-one oxime, C14H13NO2, is commercially available and can be used as a multidentate ligand for which many trivial names such as cuprone or alpha-benzoin, and abbreviations including AboH2, BzoxH2, are in use. Used for a long time for the determination of manganese or copper in steel (Feigl, 1923; Knowles, 1932; Kar, 1935), BzoxH2 has attracted considerable attention nowadays in the coordination chemistry of transition metals for the preparation of molecular wheels and high-nuclearity metal units with copper, manganese or nickel cations (Stamatatos et al., 2012; Vlahopoulou et al., 2009; Koumousi et al. 2010; Karotsis et al., 2009). In the course of a project to evaluate the reactivity of BzoxH2 towards organotin(IV) compounds, we obtained high-quality single crystals of the title compound which we have used for by X-ray diffraction.
2. Structural commentary
BzoxH2 crystallizes in the centrosymmetric monoclinic C2/c with eight molecules in the and one molecule in the As the compound possesses an asymmetric carbon atom (C2), the molecule of the has an R-configuration while the corresponding S-configured molecule of the is generated by a crystallographic centre of symmetry. Both molecules also show the E configuration at the N=C double bond of the oxime moiety (Fig. 1).
The length [1.278 (2) Å] of the N=C double bond (Table 1) is consistent with the value of 1.281 (13) Å found in other oxime moieties (Allen et al., 1987). In addition, this moiety is characterized by a bond angle of 115.5 (1)° at the N atom and of 102.1° at the O atom. The central C—C bond of the molecule has a length of 1.525 (2), which is also in good accordance with a typical single bond between sp3 (C2) and sp2 (C1) hybridized C atoms. As a consequence of the different states, however, the bonds of these two carbon atoms to their phenyl groups are slightly different: 1.512 (2) Å for C2 and 1.484 (2) Å for C1, respectively. The hydroxy group attached to C2 shows a C—O bond length of 1.425 (2) Å, which also lies in the normal range (1.421–1.433 Å) of a C2–CH–OH group (Allen et al., 1987).
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The two phenyl groups exhibit a mean C—C bond length of 1.387 (5) Å [variation: 1.374 (3)–1.398 (2) Å], in excellent agreement with the literature value (Allen et al., 1987) of 1.387 (10) Å for Car—Car. The mean value of the endocyclic bond angles within the phenyl rings is 120.0 (5)° with minima at the ipso carbon atoms C11 [118.3 (1)°] and C21 [119.1 (1)°]. The phenyl rings form an interplanar angle of 80.72 (5)°.
3. Supramolecular features
The molecule possesses two hydroxy groups which, in principle, can act as donors and acceptors for hydrogen bonding while the N atom of the oxime moiety can only act as an acceptor atom in the formation of hydrogen bonds. In fact, the crystal packing (Fig. 2) with its clear separation of polar and non-polar moieties, results from two different types of hydrogen bonds (Table 2), giving rise to a one-dimensional tube-like arrangement of the molecules propagating along [001]. In the first type of hydrogen bond, only the hydroxy group attached to the carbon atom C2 is involved, acting both as hydrogen-donor and hydrogen-acceptor groups (Fig. 3). Since the oxygen atoms of the resulting hydrogen bonds are related to each other by a centre of symmetry [O2⋯O2ii = 2.829 (2) Å, 〈O2—H3⋯O2ii = 164°; symmetry code: (ii) = −x + 1, −y, −z + 1] and a twofold rotation axis [O2⋯O2iii = 2.806 (2) Å, 〈O2—H4⋯O1iii = 175°; symmetry code (iii) = −x + 1, y, −z + ], respectively, the hydrogen atom of the hydroxy group breaks space-group symmetry, which was considered in the structure model by two equally disordered split positions [H3/H4] of this hydrogen atom. While this kind of hydrogen-bonding system extends to an infinite number of molecules, the second type of hydrogen bond is limited to two neigbouring molecules. It involves the hydroxy group of the oxime moiety that acts as an H-atom donor forming mutual hydrogen bonds with the nitrogen atom of the oxime moiety of a neighbouring molecule, giving rise to two equivalent hydrogen bonds [O1⋯N1i = 2.805 (2) Å, 〈O1—H1⋯ N1i = 144°; symmetry code: (i) = −x + 1, y, −z + ] between these two molecules (Fig. 4). The two molecules within the resulting six-membered ring are related to each other by a twofold rotation axis.
4. Synthesis and crystallization
In a typical experiment, α-benzoinoxime was refluxed with di-n-butyltin oxide, C8H18OSn, in ethanol for 2.5 h. Single crystals of the title compound suitable for X-ray diffraction were obtained from the ethanolic solution layered with n-hexane.
5. details
Crystal data, data collection and structure . All H atoms were clearly identified in difference Fourier syntheses. Those of the carbon skeleton were calculated assuming idealized geometries and allowed to ride on the carbon atoms with 1.00 Å for sp3-hybridized and 0.95 Å for aromatic H atoms, and with Uiso(H) = 1.2Ueq(C). The H atoms of the two hydroxy groups were modelled with a common O—H distance of 0.96 Å before they were fixed and allowed to ride on the corresponding oxygen atom with Uiso(H) = 1.2Ueq(O). Disorder of the hydroxy group attached to C2 was taken into account reducing the site occupancy of both H atoms to one-half. This suggestion was confirmed by difference-Fourier maps that clearly showed both positions.
details are summarized in Table 3Supporting information
CCDC reference: 1556039
https://doi.org/10.1107/S2056989017008866/wm5397sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989017008866/wm5397Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989017008866/wm5397Isup3.cml
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenburg, 2006) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015).C14H13NO2 | F(000) = 960 |
Mr = 227.25 | Dx = 1.335 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
a = 24.1434 (9) Å | Cell parameters from 1932 reflections |
b = 10.5348 (4) Å | θ = 3.1–24.4° |
c = 8.9006 (4) Å | µ = 0.09 mm−1 |
β = 93.042 (2)° | T = 100 K |
V = 2260.64 (16) Å3 | Block, colourless |
Z = 8 | 0.37 × 0.32 × 0.11 mm |
Bruker APEXII CCD diffractometer | 1765 reflections with I > 2σ(I) |
φ and ω scans | Rint = 0.043 |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | θmax = 25.0°, θmin = 2.1° |
Tmin = 0.968, Tmax = 0.990 | h = −28→28 |
50071 measured reflections | k = −12→12 |
2005 independent reflections | l = −10→10 |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.036 | H-atom parameters constrained |
wR(F2) = 0.088 | w = 1/[σ2(Fo2) + (0.0361P)2 + 2.1083P] where P = (Fo2 + 2Fc2)/3 |
S = 1.08 | (Δ/σ)max < 0.001 |
2005 reflections | Δρmax = 0.22 e Å−3 |
157 parameters | Δρmin = −0.18 e Å−3 |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
O1 | 0.43413 (4) | 0.17890 (9) | 0.80605 (10) | 0.0241 (2) | |
H1 | 0.4693 | 0.1776 | 0.8619 | 0.029 (3)* | |
C1 | 0.41037 (6) | 0.14256 (12) | 0.55975 (15) | 0.0203 (3) | |
N1 | 0.44993 (5) | 0.16404 (11) | 0.65751 (12) | 0.0214 (3) | |
O2 | 0.48687 (4) | 0.10235 (9) | 0.40164 (11) | 0.0252 (3) | |
H3 | 0.4938 | 0.0231 | 0.4524 | 0.029 (3)* | 0.5 |
H4 | 0.4959 | 0.0973 | 0.2981 | 0.029 (3)* | 0.5 |
C2 | 0.42878 (6) | 0.12695 (13) | 0.39955 (15) | 0.0217 (3) | |
H2 | 0.4086 | 0.0531 | 0.3519 | 0.029 (3)* | |
C11 | 0.35015 (6) | 0.13354 (13) | 0.58375 (15) | 0.0210 (3) | |
C12 | 0.31705 (6) | 0.04617 (14) | 0.50248 (16) | 0.0253 (3) | |
H12 | 0.3332 | −0.0072 | 0.4307 | 0.0306 (19)* | |
C13 | 0.26100 (6) | 0.03627 (15) | 0.52511 (17) | 0.0302 (4) | |
H13 | 0.2391 | −0.0245 | 0.4700 | 0.0306 (19)* | |
C14 | 0.23671 (6) | 0.11432 (16) | 0.62737 (17) | 0.0311 (4) | |
H14 | 0.1982 | 0.1071 | 0.6432 | 0.0306 (19)* | |
C15 | 0.26863 (6) | 0.20283 (15) | 0.70637 (17) | 0.0283 (3) | |
H15 | 0.2518 | 0.2576 | 0.7755 | 0.0306 (19)* | |
C16 | 0.32497 (6) | 0.21281 (14) | 0.68598 (16) | 0.0247 (3) | |
H16 | 0.3466 | 0.2738 | 0.7417 | 0.0306 (19)* | |
C21 | 0.41529 (5) | 0.24451 (14) | 0.30732 (15) | 0.0223 (3) | |
C22 | 0.43786 (6) | 0.36078 (15) | 0.34820 (17) | 0.0292 (3) | |
H22 | 0.4627 | 0.3671 | 0.4344 | 0.040 (2)* | |
C23 | 0.42453 (7) | 0.46786 (16) | 0.2644 (2) | 0.0373 (4) | |
H23 | 0.4397 | 0.5478 | 0.2940 | 0.040 (2)* | |
C24 | 0.38915 (7) | 0.45886 (17) | 0.13770 (19) | 0.0402 (4) | |
H24 | 0.3797 | 0.5327 | 0.0807 | 0.040 (2)* | |
C25 | 0.36771 (7) | 0.34293 (18) | 0.09425 (18) | 0.0404 (4) | |
H25 | 0.3440 | 0.3362 | 0.0059 | 0.040 (2)* | |
C26 | 0.38058 (6) | 0.23623 (16) | 0.17912 (17) | 0.0312 (4) | |
H26 | 0.3654 | 0.1564 | 0.1491 | 0.040 (2)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0247 (5) | 0.0303 (6) | 0.0176 (5) | 0.0021 (4) | 0.0046 (4) | −0.0010 (4) |
C1 | 0.0231 (7) | 0.0159 (7) | 0.0221 (7) | 0.0033 (5) | 0.0038 (5) | 0.0023 (5) |
N1 | 0.0240 (6) | 0.0217 (6) | 0.0189 (6) | 0.0021 (5) | 0.0057 (5) | −0.0002 (5) |
O2 | 0.0211 (5) | 0.0259 (5) | 0.0292 (5) | 0.0051 (4) | 0.0078 (4) | 0.0033 (4) |
C2 | 0.0185 (7) | 0.0234 (7) | 0.0236 (7) | 0.0017 (5) | 0.0041 (5) | −0.0008 (6) |
C11 | 0.0230 (7) | 0.0209 (7) | 0.0194 (7) | 0.0025 (5) | 0.0037 (5) | 0.0051 (5) |
C12 | 0.0273 (8) | 0.0258 (8) | 0.0230 (7) | 0.0027 (6) | 0.0029 (6) | 0.0014 (6) |
C13 | 0.0256 (8) | 0.0347 (9) | 0.0301 (8) | −0.0045 (6) | −0.0001 (6) | 0.0031 (7) |
C14 | 0.0224 (8) | 0.0421 (9) | 0.0292 (8) | 0.0007 (7) | 0.0052 (6) | 0.0090 (7) |
C15 | 0.0266 (8) | 0.0332 (8) | 0.0259 (8) | 0.0060 (6) | 0.0084 (6) | 0.0035 (6) |
C16 | 0.0268 (8) | 0.0245 (7) | 0.0232 (7) | 0.0024 (6) | 0.0043 (6) | 0.0022 (6) |
C21 | 0.0209 (7) | 0.0265 (8) | 0.0203 (7) | 0.0057 (6) | 0.0081 (5) | 0.0002 (6) |
C22 | 0.0269 (8) | 0.0314 (8) | 0.0297 (8) | 0.0012 (6) | 0.0051 (6) | 0.0027 (7) |
C23 | 0.0397 (9) | 0.0274 (9) | 0.0465 (10) | 0.0026 (7) | 0.0177 (8) | 0.0054 (7) |
C24 | 0.0503 (10) | 0.0395 (10) | 0.0325 (9) | 0.0225 (8) | 0.0189 (8) | 0.0163 (8) |
C25 | 0.0478 (10) | 0.0527 (11) | 0.0206 (8) | 0.0244 (9) | 0.0007 (7) | 0.0016 (7) |
C26 | 0.0346 (8) | 0.0353 (9) | 0.0239 (8) | 0.0095 (7) | 0.0028 (6) | −0.0052 (7) |
O1—N1 | 1.404 (1) | C14—C15 | 1.378 (2) |
O1—H1 | 0.9600 | C14—H14 | 0.9500 |
C1—N1 | 1.278 (2) | C15—C16 | 1.386 (2) |
C1—C11 | 1.484 (2) | C15—H15 | 0.9500 |
C1—C2 | 1.525 (2) | C16—H16 | 0.9500 |
O2—C2 | 1.425 (2) | C21—C22 | 1.381 (2) |
O2—H3 | 0.9600 | C21—C26 | 1.382 (2) |
O2—H4 | 0.9600 | C22—C23 | 1.381 (2) |
C2—C21 | 1.512 (2) | C22—H22 | 0.9500 |
C2—H2 | 1.0000 | C23—C24 | 1.382 (3) |
C11—C12 | 1.396 (2) | C23—H23 | 0.9500 |
C11—C16 | 1.398 (2) | C24—C25 | 1.374 (3) |
C12—C13 | 1.383 (2) | C24—H24 | 0.9500 |
C12—H12 | 0.9500 | C25—C26 | 1.380 (2) |
C13—C14 | 1.380 (2) | C25—H25 | 0.9500 |
C13—H13 | 0.9500 | C26—H26 | 0.9500 |
N1—O1—H1 | 102.1 | C13—C14—H14 | 120.2 |
N1—C1—C11 | 128.03 (12) | C14—C15—C16 | 120.70 (14) |
N1—C1—C2 | 114.3 (1) | C14—C15—H15 | 119.6 |
C11—C1—C2 | 117.7 (1) | C16—C15—H15 | 119.6 |
C1—N1—O1 | 115.5 (1) | C15—C16—C11 | 120.25 (14) |
C2—O2—H3 | 108.1 | C15—C16—H16 | 119.9 |
C2—O2—H4 | 105.7 | C11—C16—H16 | 119.9 |
H3—O2—H4 | 111.2 | C22—C21—C26 | 119.12 (14) |
O2—C2—C21 | 109.84 (11) | C22—C21—C2 | 120.85 (13) |
O2—C2—C1 | 110.1 (1) | C26—C21—C2 | 120.02 (13) |
C21—C2—C1 | 110.75 (11) | C23—C22—C21 | 120.32 (15) |
O2—C2—H2 | 108.7 | C23—C22—H22 | 119.8 |
C21—C2—H2 | 108.7 | C21—C22—H22 | 119.8 |
C1—C2—H2 | 108.7 | C22—C23—C24 | 120.07 (16) |
C12—C11—C16 | 118.33 (13) | C22—C23—H23 | 120.0 |
C12—C11—C1 | 120.41 (12) | C24—C23—H23 | 120.0 |
C16—C11—C1 | 121.26 (13) | C25—C24—C23 | 119.88 (15) |
C13—C12—C11 | 120.81 (13) | C25—C24—H24 | 120.1 |
C13—C12—H12 | 119.6 | C23—C24—H24 | 120.1 |
C11—C12—H12 | 119.6 | C24—C25—C26 | 119.95 (16) |
C14—C13—C12 | 120.31 (14) | C24—C25—H25 | 120.0 |
C14—C13—H13 | 119.8 | C26—C25—H25 | 120.0 |
C12—C13—H13 | 119.8 | C25—C26—C21 | 120.62 (16) |
C15—C14—C13 | 119.58 (14) | C25—C26—H26 | 119.7 |
C15—C14—H14 | 120.2 | C21—C26—H26 | 119.7 |
C11—C1—N1—O1 | 1.1 (2) | C14—C15—C16—C11 | 0.5 (2) |
C2—C1—N1—O1 | 179.96 (10) | C12—C11—C16—C15 | 0.8 (2) |
N1—C1—C2—O2 | 17.34 (16) | C1—C11—C16—C15 | 179.89 (13) |
C11—C1—C2—O2 | −163.64 (11) | O2—C2—C21—C22 | −61.09 (16) |
N1—C1—C2—C21 | −104.31 (14) | C1—C2—C21—C22 | 60.68 (16) |
C11—C1—C2—C21 | 74.72 (15) | O2—C2—C21—C26 | 118.01 (14) |
N1—C1—C11—C12 | −143.31 (15) | C1—C2—C21—C26 | −120.23 (14) |
C2—C1—C11—C12 | 37.82 (18) | C26—C21—C22—C23 | 1.9 (2) |
N1—C1—C11—C16 | 37.6 (2) | C2—C21—C22—C23 | −178.96 (13) |
C2—C1—C11—C16 | −141.28 (13) | C21—C22—C23—C24 | −1.0 (2) |
C16—C11—C12—C13 | −1.5 (2) | C22—C23—C24—C25 | −0.7 (2) |
C1—C11—C12—C13 | 179.39 (13) | C23—C24—C25—C26 | 1.4 (2) |
C11—C12—C13—C14 | 0.9 (2) | C24—C25—C26—C21 | −0.5 (2) |
C12—C13—C14—C15 | 0.3 (2) | C22—C21—C26—C25 | −1.2 (2) |
C13—C14—C15—C16 | −1.1 (2) | C2—C21—C26—C25 | 179.69 (13) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1i | 0.96 | 1.97 | 2.805 (2) | 144 |
O2—H3···O2ii | 0.96 | 1.89 | 2.829 (2) | 164 |
O2—H4···O2iii | 0.96 | 1.85 | 2.806 (2) | 175 |
Symmetry codes: (i) −x+1, y, −z+3/2; (ii) −x+1, −y, −z+1; (iii) −x+1, y, −z+1/2. |
Acknowledgements
We thank the Deutsche Forschungsgemeinschaft and the Government of Lower-Saxony for funding the diffractometer and acknowledge support by Deutsche Forschungsgemeinschaft (DFG) and Open Access Publishing Fund of Osnabrück University.
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