organic compounds
Redetermination of 4-hydroxybenzaldehyde
aDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA, bDepartment of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA, cDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri 574199, India, dDepartment Chemistry, Sambhram Institute of Technology, Bangalore 560 097, India, and eDepartment of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570006, India
*Correspondence e-mail: jjasinski@keene.edu
This is a redetermination of the structure of the title compound, C7H6O2, which was first reported by Iwasaki [Acta Cryst. (1977), B33, 1646–1648]. The results are obtained with greater precision in the present study. Crystal packing is stabilized by intermolecular O—H⋯O interactions between the hydroxyl and aldehyde groups which link the molecules into chains in a zigzag pattern along the [110] plane of the unit cell.
Related literature
For the previous ). Forrelated structures, see: Matos Beja et al. (1997, 2000); Paixão et al. (2000); Silva et al. (2004). For related literature, see: Antonucci (1978); Bigi et al. (1999); Dean (1963); Samal et al. (1999).
see: Iwasaki (1977Experimental
Crystal data
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Refinement
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Data collection: CrysAlisPro (Oxford Diffraction, 2007); cell CrysAlisPro; data reduction: CrysAlisPro; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2000); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536807063659/lx2042sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536807063659/lx2042Isup2.hkl
A sample of 4-hydroxybenzaldehyde was obtained from Sigma–Aldrich and was recrystallized from ethylacetate by slow evaporation to obtain good quality crystals (m.p.: 385–387 K).
The hydroxyl H was located in a difference Fourier map and all parameters were freely refined. All other H atoms were placed in their calculated places and refined using a riding model with C—H = 0.93 Å, and with Uiso(H) = 1.21Ueq(C).
The title compound, 4-hydroxy benzaldehyde (Fig. 1) is used in the preparation of aldehyde methacrylates and finds application in the manufacture of dental materials which can form strong and durable bonds with dentin (Antonucci, 1978). It is used in the preparation of benzopyrans and have wide applications in the perfume, cosmetic and pharmaceutical industry (Dean, 1963; Bigi et al., 1999). They are also used in the preparation of chelating resins (Samal et al., 1999).
The crystal structures of p-hydroxybenzaldehyde (Iwasaki, 1977), 2-bromo-5-hydroxybenzaldehyde (Matos Beja et al., 2000), a new polymorph of 2-bromo-5-hydroxybenzaldehyde (Silva et al., 2004), 3-hydroxybenzaldehyde (Paixão et al., 2000) and 2,4-dibromo-5-hydroxybenzaldehyde, (Matos Beja et al., 1997) have been reported. In view of the importance of the title compound in the pharmaceutical industry, this paper reports a redetermination of the
with greater precision and accuracy. Crystal packing is stabilized by intermolecular O—H···O interactions between the hydroxyl and aldlehyde groups which link the molecules into chains in a zigzag pattern along the [110] plane of the (Fig. 2).For related structures, see: Matos Beja et al. (1997, 2000); Iwasaki (1977); Paixão et al. (2000); Silva et al. (2004). For related literature, see: Antonucci (1978); Bigi et al. (1999); Dean (1963); Samal et al. (1999).
Data collection: CrysAlis PRO (Oxford Diffraction, 2007); cell
CrysAlis PRO (Oxford Diffraction, 2007); data reduction: CrysAlis PRO (Oxford Diffraction, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2000); software used to prepare material for publication: SHELXTL (Bruker, 2000).C7H6O2 | F(000) = 256 |
Mr = 122.12 | Dx = 1.357 Mg m−3 |
Monoclinic, P21/c | Melting point = 385–387 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 6.6992 (8) Å | Cell parameters from 1669 reflections |
b = 13.5550 (12) Å | θ = 5.3–29.0° |
c = 7.1441 (11) Å | µ = 0.10 mm−1 |
β = 112.871 (16)° | T = 296 K |
V = 597.74 (15) Å3 | Chunk, colourless |
Z = 4 | 0.49 × 0.37 × 0.24 mm |
Oxford Diffraction Gemini R CCD diffractometer | 1170 independent reflections |
Radiation source: fine-focus sealed tube | 841 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.022 |
Detector resolution: 10.5081 pixels mm-1 | θmax = 26.0°, θmin = 5.5° |
φ and ω scans | h = −8→8 |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2007) | k = −15→16 |
Tmin = 0.949, Tmax = 0.970 | l = −8→8 |
3559 measured reflections |
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) = 0.117 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.068P)2] where P = (Fo2 + 2Fc2)/3 |
1170 reflections | (Δ/σ)max < 0.001 |
86 parameters | Δρmax = 0.13 e Å−3 |
0 restraints | Δρmin = −0.18 e Å−3 |
C7H6O2 | V = 597.74 (15) Å3 |
Mr = 122.12 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 6.6992 (8) Å | µ = 0.10 mm−1 |
b = 13.5550 (12) Å | T = 296 K |
c = 7.1441 (11) Å | 0.49 × 0.37 × 0.24 mm |
β = 112.871 (16)° |
Oxford Diffraction Gemini R CCD diffractometer | 1170 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2007) | 841 reflections with I > 2σ(I) |
Tmin = 0.949, Tmax = 0.970 | Rint = 0.022 |
3559 measured reflections |
R[F2 > 2σ(F2)] = 0.038 | 0 restraints |
wR(F2) = 0.117 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.13 e Å−3 |
1170 reflections | Δρmin = −0.18 e Å−3 |
86 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 | ||
O1 | 0.1345 (2) | 0.72809 (8) | 0.1335 (2) | 0.0652 (4) | |
H1 | 0.016 (4) | 0.7359 (17) | 0.140 (3) | 0.092 (8)* | |
O2 | 0.2691 (2) | 0.26982 (8) | 0.3786 (2) | 0.0633 (4) | |
C1 | 0.1834 (2) | 0.63218 (11) | 0.1834 (2) | 0.0458 (4) | |
C2 | 0.3718 (2) | 0.59530 (11) | 0.1700 (2) | 0.0499 (4) | |
H2 | 0.4587 | 0.6359 | 0.1284 | 0.060* | |
C3 | 0.4277 (2) | 0.49829 (11) | 0.2187 (2) | 0.0465 (4) | |
H3 | 0.5542 | 0.4740 | 0.2112 | 0.056* | |
C4 | 0.2990 (2) | 0.43542 (11) | 0.2793 (2) | 0.0417 (4) | |
C5 | 0.1100 (2) | 0.47379 (11) | 0.2921 (2) | 0.0452 (4) | |
H5 | 0.0218 | 0.4330 | 0.3317 | 0.054* | |
C6 | 0.0543 (2) | 0.57089 (11) | 0.2467 (2) | 0.0470 (4) | |
H6 | −0.0698 | 0.5959 | 0.2581 | 0.056* | |
C7 | 0.3667 (3) | 0.33405 (12) | 0.3294 (2) | 0.0509 (4) | |
H7 | 0.4981 | 0.3161 | 0.3235 | 0.061* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0635 (8) | 0.0422 (7) | 0.1018 (10) | 0.0034 (6) | 0.0451 (7) | 0.0091 (6) |
O2 | 0.0586 (7) | 0.0434 (7) | 0.0917 (9) | −0.0019 (5) | 0.0332 (7) | 0.0049 (6) |
C1 | 0.0463 (8) | 0.0385 (8) | 0.0547 (9) | −0.0030 (6) | 0.0219 (7) | −0.0039 (7) |
C2 | 0.0472 (9) | 0.0463 (9) | 0.0636 (10) | −0.0078 (7) | 0.0297 (8) | −0.0039 (7) |
C3 | 0.0372 (7) | 0.0483 (9) | 0.0582 (9) | −0.0026 (6) | 0.0231 (7) | −0.0089 (7) |
C4 | 0.0396 (8) | 0.0404 (8) | 0.0447 (8) | −0.0013 (6) | 0.0157 (6) | −0.0058 (6) |
C5 | 0.0417 (8) | 0.0450 (9) | 0.0536 (9) | −0.0050 (7) | 0.0235 (7) | −0.0012 (7) |
C6 | 0.0404 (8) | 0.0466 (9) | 0.0593 (9) | 0.0020 (7) | 0.0252 (7) | −0.0018 (7) |
C7 | 0.0430 (8) | 0.0455 (9) | 0.0648 (10) | −0.0012 (7) | 0.0217 (8) | −0.0055 (7) |
O1—C1 | 1.354 (2) | C3—H3 | 0.9300 |
O1—H1 | 0.82 (3) | C4—C5 | 1.404 (2) |
O2—C7 | 1.219 (2) | C4—C7 | 1.448 (2) |
C1—C2 | 1.395 (2) | C5—C6 | 1.372 (2) |
C1—C6 | 1.395 (2) | C5—H5 | 0.9300 |
C2—C3 | 1.374 (2) | C6—H6 | 0.9300 |
C2—H2 | 0.9300 | C7—H7 | 0.9300 |
C3—C4 | 1.395 (2) | ||
C1—O1—H1 | 104.4 (16) | C3—C4—C7 | 118.98 (13) |
O1—C1—C2 | 117.30 (14) | C5—C4—C7 | 122.62 (13) |
O1—C1—C6 | 122.68 (14) | C6—C5—C4 | 120.61 (13) |
C2—C1—C6 | 120.02 (14) | C6—C5—H5 | 119.7 |
C3—C2—C1 | 119.35 (14) | C4—C5—H5 | 119.7 |
C3—C2—H2 | 120.3 | C5—C6—C1 | 120.12 (14) |
C1—C2—H2 | 120.3 | C5—C6—H6 | 119.9 |
C2—C3—C4 | 121.50 (14) | C1—C6—H6 | 119.9 |
C2—C3—H3 | 119.3 | O2—C7—C4 | 126.70 (15) |
C4—C3—H3 | 119.3 | O2—C7—H7 | 116.7 |
C3—C4—C5 | 118.39 (13) | C4—C7—H7 | 116.7 |
O1—C1—C2—C3 | −179.85 (14) | C7—C4—C5—C6 | 178.77 (14) |
C6—C1—C2—C3 | 0.3 (2) | C4—C5—C6—C1 | 1.2 (2) |
C1—C2—C3—C4 | 0.7 (2) | O1—C1—C6—C5 | 178.90 (14) |
C2—C3—C4—C5 | −0.8 (2) | C2—C1—C6—C5 | −1.2 (2) |
C2—C3—C4—C7 | −179.78 (14) | C3—C4—C7—O2 | −177.67 (15) |
C3—C4—C5—C6 | −0.2 (2) | C5—C4—C7—O2 | 3.4 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O2i | 0.82 (3) | 1.92 (3) | 2.731 (2) | 171 (2) |
Symmetry code: (i) −x, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C7H6O2 |
Mr | 122.12 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 6.6992 (8), 13.5550 (12), 7.1441 (11) |
β (°) | 112.871 (16) |
V (Å3) | 597.74 (15) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.49 × 0.37 × 0.24 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini R CCD |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2007) |
Tmin, Tmax | 0.949, 0.970 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3559, 1170, 841 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.038, 0.117, 1.06 |
No. of reflections | 1170 |
No. of parameters | 86 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.13, −0.18 |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2007), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Bruker, 2000).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O2i | 0.82 (3) | 1.92 (3) | 2.731 (2) | 171 (2) |
Symmetry code: (i) −x, y+1/2, −z+1/2. |
Acknowledgements
MTS thanks the Sambhram Institute of Technology for the use of their research facilities. RJB acknowledges the NSF–MRI program (grant No. CHE-0619278) for funds to purchase the X-ray diffractometer.
References
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The title compound, 4-hydroxy benzaldehyde (Fig. 1) is used in the preparation of aldehyde methacrylates and finds application in the manufacture of dental materials which can form strong and durable bonds with dentin (Antonucci, 1978). It is used in the preparation of benzopyrans and have wide applications in the perfume, cosmetic and pharmaceutical industry (Dean, 1963; Bigi et al., 1999). They are also used in the preparation of chelating resins (Samal et al., 1999).
The crystal structures of p-hydroxybenzaldehyde (Iwasaki, 1977), 2-bromo-5-hydroxybenzaldehyde (Matos Beja et al., 2000), a new polymorph of 2-bromo-5-hydroxybenzaldehyde (Silva et al., 2004), 3-hydroxybenzaldehyde (Paixão et al., 2000) and 2,4-dibromo-5-hydroxybenzaldehyde, (Matos Beja et al., 1997) have been reported. In view of the importance of the title compound in the pharmaceutical industry, this paper reports a redetermination of the crystal structure with greater precision and accuracy. Crystal packing is stabilized by intermolecular O—H···O interactions between the hydroxyl and aldlehyde groups which link the molecules into chains in a zigzag pattern along the [110] plane of the unit cell (Fig. 2).