In the title compound, C
18H
20N
2O
3, the azobenzene unit has a
trans configuration, and the two benzene rings are inclined with respect to each other by 5.9 (2)°. Molecules are linked by O—H
O hydrogen bonds into a linear chain along [10
].
Supporting information
CCDC reference: 620754
Key indicators
- Single-crystal X-ray study
- T = 296 K
- Mean (C-C) = 0.004 Å
- R factor = 0.038
- wR factor = 0.059
- Data-to-parameter ratio = 14.1
checkCIF/PLATON results
No syntax errors found
Alert level A
PLAT026_ALERT_3_A Ratio Observed / Unique Reflections too Low .... 28 Perc.
| Author Response: The crystal is very thin (SIZE 0.07 0.293 0.37) and although the
exposure time was set rather high (3 min.) the weak reflections ratio was
high, so the unique data ratio above the 2 sigma level is low.
|
Alert level C
PLAT230_ALERT_2_C Hirshfeld Test Diff for O3 - C10 .. 6.35 su
PLAT242_ALERT_2_C Check Low Ueq as Compared to Neighbors for C4
PLAT340_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ... 5
1 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
2 ALERT type 2 Indicator that the structure model may be wrong or deficient
2 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: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA; data reduction: X-RED32 (Stoe & Cie, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLUTON (Spek, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
(
E)-2-Hydroxy-3-methoxy-5-[(4-propylphenyl)diazenyl]benzaldehyde
top
Crystal data top
C18H20N2O3 | F(000) = 664 |
Mr = 312.36 | Dx = 1.234 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 2128 reflections |
a = 4.6264 (10) Å | θ = 2.0–21.7° |
b = 35.911 (7) Å | µ = 0.09 mm−1 |
c = 10.342 (2) Å | T = 296 K |
β = 101.974 (16)° | Plate, brown |
V = 1680.9 (6) Å3 | 0.37 × 0.29 × 0.07 mm |
Z = 4 | |
Data collection top
Stoe IPDS-2 diffractometer | 2983 independent reflections |
Radiation source: fine-focus sealed tube | 831 reflections with I > 2σ(I) |
Plane graphite monochromator | Rint = 0.079 |
ω scans | θmax = 25.0°, θmin = 2.1° |
Absorption correction: integration (X-RED32; Stoe & Cie, 2002) | h = −5→5 |
Tmin = 0.972, Tmax = 0.989 | k = −42→38 |
10696 measured reflections | l = −12→12 |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.038 | H-atom parameters constrained |
wR(F2) = 0.059 | w = 1/[σ2(Fo2) + (0.0064P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.80 | (Δ/σ)max = 0.001 |
2983 reflections | Δρmax = 0.11 e Å−3 |
211 parameters | Δρmin = −0.15 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 1997), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0047 (5) |
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 | |
O2 | −0.2761 (5) | 0.28513 (5) | −0.22611 (18) | 0.1172 (8) | |
O3 | −0.6027 (5) | 0.25650 (6) | 0.08818 (15) | 0.0917 (7) | |
H3 | −0.6435 | 0.2516 | 0.1598 | 0.138* | |
O4 | −0.5048 (4) | 0.29373 (5) | 0.31390 (17) | 0.0863 (6) | |
N1 | 0.2078 (6) | 0.39437 (7) | 0.2334 (2) | 0.0816 (8) | |
N2 | 0.1160 (6) | 0.38095 (7) | 0.1209 (2) | 0.0813 (8) | |
C1 | 0.4025 (7) | 0.42586 (9) | 0.2311 (3) | 0.0778 (10) | |
C2 | 0.4952 (7) | 0.43808 (9) | 0.1202 (3) | 0.0912 (11) | |
H2 | 0.4374 | 0.4255 | 0.0405 | 0.109* | |
C3 | 0.6743 (8) | 0.46912 (10) | 0.1277 (3) | 0.0950 (11) | |
H3A | 0.7357 | 0.4771 | 0.0522 | 0.114* | |
C4 | 0.7642 (7) | 0.48849 (9) | 0.2438 (4) | 0.0812 (9) | |
C5 | 0.6755 (7) | 0.47544 (10) | 0.3545 (3) | 0.0997 (11) | |
H5 | 0.7367 | 0.4876 | 0.4349 | 0.120* | |
C6 | 0.4960 (7) | 0.44440 (9) | 0.3472 (3) | 0.0917 (10) | |
H6 | 0.4380 | 0.4360 | 0.4231 | 0.110* | |
C7 | −0.0753 (7) | 0.34951 (9) | 0.1220 (3) | 0.0742 (10) | |
C8 | −0.1408 (7) | 0.33025 (9) | 0.0050 (3) | 0.0793 (10) | |
H8 | −0.0661 | 0.3384 | −0.0668 | 0.095* | |
C9 | −0.3181 (7) | 0.29861 (9) | −0.0073 (3) | 0.0725 (9) | |
C10 | −0.4297 (7) | 0.28735 (8) | 0.1003 (3) | 0.0725 (9) | |
C11 | −0.3715 (7) | 0.30797 (8) | 0.2196 (3) | 0.0712 (9) | |
C12 | −0.1926 (7) | 0.33848 (8) | 0.2292 (3) | 0.0722 (9) | |
H12 | −0.1491 | 0.3519 | 0.3076 | 0.087* | |
C13 | −0.3782 (7) | 0.27722 (8) | −0.1300 (3) | 0.1013 (12) | |
H13 | −0.5007 | 0.2565 | −0.1352 | 0.122* | |
C14 | −0.4644 (6) | 0.31384 (7) | 0.4360 (2) | 0.0983 (10) | |
H14A | −0.2575 | 0.3152 | 0.4752 | 0.148* | |
H14B | −0.5664 | 0.3013 | 0.4952 | 0.148* | |
H14C | −0.5423 | 0.3386 | 0.4194 | 0.148* | |
C15 | 0.9490 (7) | 0.52351 (9) | 0.2484 (3) | 0.0979 (10) | |
H15A | 1.0101 | 0.5263 | 0.1647 | 0.117* | |
H15B | 1.1260 | 0.5208 | 0.3169 | 0.117* | |
C16 | 0.7869 (7) | 0.55867 (9) | 0.2754 (3) | 0.0956 (9) | |
H16A | 0.6075 | 0.5610 | 0.2080 | 0.115* | |
H16B | 0.7296 | 0.5560 | 0.3599 | 0.115* | |
C17 | 0.9640 (7) | 0.59412 (9) | 0.2775 (3) | 0.1098 (11) | |
H17A | 1.1457 | 0.5916 | 0.3433 | 0.132* | |
H17B | 1.0174 | 0.5971 | 0.1922 | 0.132* | |
C18 | 0.8085 (8) | 0.62852 (8) | 0.3069 (3) | 0.1509 (15) | |
H18A | 0.9374 | 0.6496 | 0.3091 | 0.226* | |
H18B | 0.7540 | 0.6259 | 0.3911 | 0.226* | |
H18C | 0.6342 | 0.6322 | 0.2394 | 0.226* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O2 | 0.201 (2) | 0.0790 (16) | 0.0887 (14) | −0.0078 (16) | 0.0695 (16) | −0.0048 (13) |
O3 | 0.134 (2) | 0.0796 (16) | 0.0695 (13) | −0.0125 (14) | 0.0384 (14) | −0.0033 (12) |
O4 | 0.1156 (18) | 0.0827 (15) | 0.0667 (12) | −0.0047 (12) | 0.0330 (12) | −0.0019 (12) |
N1 | 0.084 (2) | 0.069 (2) | 0.0896 (19) | 0.0043 (16) | 0.0138 (17) | 0.0052 (16) |
N2 | 0.092 (2) | 0.069 (2) | 0.0833 (19) | 0.0093 (16) | 0.0186 (17) | 0.0017 (15) |
C1 | 0.085 (3) | 0.070 (3) | 0.079 (2) | 0.0075 (19) | 0.018 (2) | 0.007 (2) |
C2 | 0.105 (3) | 0.081 (3) | 0.091 (3) | −0.003 (2) | 0.027 (2) | 0.002 (2) |
C3 | 0.105 (3) | 0.091 (3) | 0.094 (3) | 0.003 (2) | 0.032 (2) | 0.008 (2) |
C4 | 0.069 (2) | 0.076 (3) | 0.101 (3) | 0.002 (2) | 0.021 (2) | 0.005 (2) |
C5 | 0.107 (3) | 0.105 (3) | 0.088 (3) | −0.024 (2) | 0.022 (2) | −0.003 (2) |
C6 | 0.100 (3) | 0.098 (3) | 0.080 (2) | −0.011 (2) | 0.028 (2) | 0.002 (2) |
C7 | 0.081 (3) | 0.061 (2) | 0.083 (2) | 0.0064 (19) | 0.021 (2) | 0.003 (2) |
C8 | 0.099 (3) | 0.068 (2) | 0.077 (2) | 0.011 (2) | 0.035 (2) | 0.0105 (18) |
C9 | 0.096 (3) | 0.060 (2) | 0.067 (2) | 0.004 (2) | 0.030 (2) | 0.0033 (19) |
C10 | 0.085 (3) | 0.057 (2) | 0.080 (2) | 0.0020 (19) | 0.025 (2) | 0.0037 (19) |
C11 | 0.088 (3) | 0.062 (2) | 0.066 (2) | 0.0082 (19) | 0.022 (2) | 0.0039 (19) |
C12 | 0.089 (3) | 0.068 (2) | 0.0626 (19) | 0.0130 (19) | 0.0219 (18) | 0.0016 (18) |
C13 | 0.154 (3) | 0.079 (3) | 0.079 (2) | −0.007 (2) | 0.044 (2) | −0.004 (2) |
C14 | 0.140 (3) | 0.095 (2) | 0.0650 (18) | 0.008 (2) | 0.0327 (19) | −0.0071 (18) |
C15 | 0.084 (3) | 0.090 (3) | 0.121 (3) | −0.005 (2) | 0.025 (2) | 0.010 (2) |
C16 | 0.101 (3) | 0.086 (2) | 0.106 (2) | −0.008 (2) | 0.035 (2) | −0.004 (2) |
C17 | 0.112 (3) | 0.093 (2) | 0.130 (3) | −0.023 (3) | 0.040 (2) | −0.001 (2) |
C18 | 0.173 (4) | 0.094 (3) | 0.209 (4) | −0.015 (3) | 0.091 (3) | −0.037 (3) |
Geometric parameters (Å, º) top
O2—C13 | 1.219 (2) | C8—H8 | 0.93 |
O3—C10 | 1.357 (3) | C9—C10 | 1.381 (3) |
O3—H3 | 0.82 | C9—C13 | 1.460 (3) |
O4—C11 | 1.357 (3) | C10—C11 | 1.416 (3) |
O4—C14 | 1.433 (2) | C11—C12 | 1.364 (3) |
N1—N2 | 1.250 (2) | C12—H12 | 0.93 |
N1—C1 | 1.449 (3) | C13—H13 | 0.93 |
N2—C7 | 1.436 (3) | C14—H14A | 0.96 |
C1—C6 | 1.363 (3) | C14—H14B | 0.96 |
C1—C2 | 1.377 (3) | C14—H14C | 0.96 |
C2—C3 | 1.381 (3) | C15—C16 | 1.523 (3) |
C2—H2 | 0.93 | C15—H15A | 0.97 |
C3—C4 | 1.375 (3) | C15—H15B | 0.97 |
C3—H3A | 0.93 | C16—C17 | 1.512 (3) |
C4—C5 | 1.376 (3) | C16—H16A | 0.97 |
C4—C15 | 1.516 (4) | C16—H16B | 0.97 |
C5—C6 | 1.383 (3) | C17—C18 | 1.492 (3) |
C5—H5 | 0.93 | C17—H17A | 0.97 |
C6—H6 | 0.93 | C17—H17B | 0.97 |
C7—C8 | 1.372 (3) | C18—H18A | 0.96 |
C7—C12 | 1.389 (3) | C18—H18B | 0.96 |
C8—C9 | 1.392 (3) | C18—H18C | 0.96 |
| | | |
C10—O3—H3 | 109.5 | C11—C12—C7 | 120.2 (3) |
C11—O4—C14 | 116.6 (2) | C11—C12—H12 | 119.9 |
N2—N1—C1 | 112.2 (3) | C7—C12—H12 | 119.9 |
N1—N2—C7 | 112.8 (3) | O2—C13—C9 | 123.3 (3) |
C6—C1—C2 | 118.8 (3) | O2—C13—H13 | 118.3 |
C6—C1—N1 | 116.8 (3) | C9—C13—H13 | 118.3 |
C2—C1—N1 | 124.4 (3) | O4—C14—H14A | 109.5 |
C1—C2—C3 | 119.9 (3) | O4—C14—H14B | 109.5 |
C1—C2—H2 | 120.1 | H14A—C14—H14B | 109.5 |
C3—C2—H2 | 120.1 | O4—C14—H14C | 109.5 |
C4—C3—C2 | 121.7 (3) | H14A—C14—H14C | 109.5 |
C4—C3—H3A | 119.1 | H14B—C14—H14C | 109.5 |
C2—C3—H3A | 119.1 | C4—C15—C16 | 113.4 (3) |
C3—C4—C5 | 117.8 (3) | C4—C15—H15A | 108.9 |
C3—C4—C15 | 120.9 (3) | C16—C15—H15A | 108.9 |
C5—C4—C15 | 121.3 (3) | C4—C15—H15B | 108.9 |
C4—C5—C6 | 120.6 (3) | C16—C15—H15B | 108.9 |
C4—C5—H5 | 119.7 | H15A—C15—H15B | 107.7 |
C6—C5—H5 | 119.7 | C17—C16—C15 | 114.5 (3) |
C1—C6—C5 | 121.2 (3) | C17—C16—H16A | 108.6 |
C1—C6—H6 | 119.4 | C15—C16—H16A | 108.6 |
C5—C6—H6 | 119.4 | C17—C16—H16B | 108.6 |
C8—C7—C12 | 120.6 (3) | C15—C16—H16B | 108.6 |
C8—C7—N2 | 114.4 (3) | H16A—C16—H16B | 107.6 |
C12—C7—N2 | 125.0 (3) | C18—C17—C16 | 114.7 (3) |
C7—C8—C9 | 120.7 (3) | C18—C17—H17A | 108.6 |
C7—C8—H8 | 119.7 | C16—C17—H17A | 108.6 |
C9—C8—H8 | 119.7 | C18—C17—H17B | 108.6 |
C10—C9—C8 | 118.5 (3) | C16—C17—H17B | 108.6 |
C10—C9—C13 | 120.7 (3) | H17A—C17—H17B | 107.6 |
C8—C9—C13 | 120.8 (3) | C17—C18—H18A | 109.5 |
O3—C10—C9 | 118.5 (3) | C17—C18—H18B | 109.5 |
O3—C10—C11 | 120.6 (3) | H18A—C18—H18B | 109.5 |
C9—C10—C11 | 120.9 (3) | C17—C18—H18C | 109.5 |
O4—C11—C12 | 127.6 (3) | H18A—C18—H18C | 109.5 |
O4—C11—C10 | 113.3 (3) | H18B—C18—H18C | 109.5 |
C12—C11—C10 | 119.1 (3) | | |
| | | |
C1—N1—N2—C7 | 179.5 (2) | C13—C9—C10—O3 | −1.7 (4) |
N2—N1—C1—C6 | 174.9 (3) | C8—C9—C10—C11 | 1.5 (4) |
N2—N1—C1—C2 | −4.6 (4) | C13—C9—C10—C11 | 179.9 (3) |
C6—C1—C2—C3 | −1.4 (5) | C14—O4—C11—C12 | 3.0 (4) |
N1—C1—C2—C3 | 178.1 (3) | C14—O4—C11—C10 | −177.9 (2) |
C1—C2—C3—C4 | 0.0 (5) | O3—C10—C11—O4 | −0.3 (4) |
C2—C3—C4—C5 | 1.5 (5) | C9—C10—C11—O4 | 178.1 (2) |
C2—C3—C4—C15 | −177.1 (3) | O3—C10—C11—C12 | 178.9 (3) |
C3—C4—C5—C6 | −1.5 (5) | C9—C10—C11—C12 | −2.7 (4) |
C15—C4—C5—C6 | 177.1 (3) | O4—C11—C12—C7 | −179.5 (3) |
C2—C1—C6—C5 | 1.4 (5) | C10—C11—C12—C7 | 1.5 (4) |
N1—C1—C6—C5 | −178.1 (3) | C8—C7—C12—C11 | 0.9 (4) |
C4—C5—C6—C1 | 0.1 (5) | N2—C7—C12—C11 | −179.7 (3) |
N1—N2—C7—C8 | −169.7 (3) | C10—C9—C13—O2 | −177.2 (3) |
N1—N2—C7—C12 | 10.9 (4) | C8—C9—C13—O2 | 1.2 (5) |
C12—C7—C8—C9 | −2.1 (4) | C3—C4—C15—C16 | 112.7 (3) |
N2—C7—C8—C9 | 178.4 (3) | C5—C4—C15—C16 | −65.9 (4) |
C7—C8—C9—C10 | 0.9 (4) | C4—C15—C16—C17 | −178.7 (3) |
C7—C8—C9—C13 | −177.5 (3) | C15—C16—C17—C18 | −178.7 (3) |
C8—C9—C10—O3 | 179.9 (3) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3···O4 | 0.82 | 2.19 | 2.646 (2) | 115 |
O3—H3···O2i | 0.82 | 1.95 | 2.685 (2) | 148 |
Symmetry code: (i) x−1/2, −y+1/2, z+1/2. |