The molecular structure of the title radical compound, C12H16N3O2, has crystallographic C2 symmetry. The dihedral angle between the pyridine and imidazole rings is 25.66 (15)°.
Supporting information
CCDC reference: 630520
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean (C-C) = 0.005 Å
- R factor = 0.079
- wR factor = 0.206
- Data-to-parameter ratio = 15.5
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT242_ALERT_2_C Check Low Ueq as Compared to Neighbors for C5
PLAT340_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ... 5
PLAT764_ALERT_4_C Overcomplete CIF Bond List Detected (Rep/Expd) . 1.18 Ratio
Alert level G
PLAT199_ALERT_1_G Check the Reported _cell_measurement_temperature 293 K
PLAT200_ALERT_1_G Check the Reported _diffrn_ambient_temperature . 293 K
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
3 ALERT level C = Check and explain
2 ALERT level G = General alerts; check
2 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
1 ALERT type 3 Indicator that the structure quality may be low
1 ALERT type 4 Improvement, methodology, query or suggestion
0 ALERT type 5 Informative message, check
Data collection: SMART (Bruker, 1999); cell refinement: SAINT (Bruker, 1999); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1997); software used to prepare material for publication: SHELXTL.
Crystal data top
C12H16N3O2 | F(000) = 500 |
Mr = 234.28 | Dx = 1.267 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 664 reflections |
a = 11.205 (7) Å | θ = 2.7–23.6° |
b = 10.452 (7) Å | µ = 0.09 mm−1 |
c = 11.031 (8) Å | T = 293 K |
β = 108.051 (11)° | Block, blue |
V = 1228.3 (14) Å3 | 0.24 × 0.20 × 0.16 mm |
Z = 4 | |
Data collection top
Bruker SMART CCD area-detector detector diffractometer | 655 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.088 |
Graphite monochromator | θmax = 26.5°, θmin = 2.7° |
φ and ω scans | h = −14→14 |
3365 measured reflections | k = −8→13 |
1258 independent reflections | l = −11→13 |
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)] = 0.079 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.206 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.09P)2] where P = (Fo2 + 2Fc2)/3 |
1258 reflections | (Δ/σ)max = 0.002 |
81 parameters | Δρmax = 0.23 e Å−3 |
0 restraints | Δρmin = −0.26 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 | |
O1 | 0.1847 (2) | 0.0863 (2) | 0.4167 (3) | 0.0898 (12) | |
N1 | 0.0000 | 0.5342 (3) | 0.2500 | 0.0603 (12) | |
N2 | 0.0872 (2) | 0.0490 (2) | 0.3291 (3) | 0.0496 (8) | |
C1 | 0.0601 (3) | 0.4654 (3) | 0.3534 (3) | 0.0567 (10) | |
H1 | 0.1015 | 0.5099 | 0.4275 | 0.068* | |
C2 | 0.0652 (3) | 0.3338 (3) | 0.3582 (3) | 0.0468 (9) | |
H2 | 0.1113 | 0.2920 | 0.4324 | 0.056* | |
C3 | 0.0000 | 0.2642 (4) | 0.2500 | 0.0382 (10) | |
C4 | 0.0000 | 0.1231 (4) | 0.2500 | 0.0390 (10) | |
C5 | 0.0664 (3) | −0.0921 (3) | 0.3004 (3) | 0.0446 (9) | |
C6 | 0.1721 (3) | −0.1362 (4) | 0.2510 (4) | 0.0769 (12) | |
H6A | 0.1684 | −0.0898 | 0.1749 | 0.115* | |
H6B | 0.1632 | −0.2261 | 0.2324 | 0.115* | |
H6C | 0.2513 | −0.1206 | 0.3147 | 0.115* | |
C7 | 0.0752 (3) | −0.1602 (3) | 0.4247 (3) | 0.0655 (11) | |
H7A | 0.1581 | −0.1497 | 0.4834 | 0.098* | |
H7B | 0.0582 | −0.2497 | 0.4084 | 0.098* | |
H7C | 0.0149 | −0.1243 | 0.4607 | 0.098* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1 | 0.0813 (18) | 0.0494 (15) | 0.093 (2) | −0.0023 (12) | −0.0389 (17) | 0.0021 (13) |
N1 | 0.074 (3) | 0.038 (2) | 0.061 (3) | 0.000 | 0.009 (2) | 0.000 |
N2 | 0.0532 (16) | 0.0382 (15) | 0.0435 (17) | −0.0023 (11) | −0.0051 (13) | 0.0032 (11) |
C1 | 0.069 (2) | 0.042 (2) | 0.050 (2) | −0.0043 (15) | 0.0039 (18) | −0.0085 (15) |
C2 | 0.057 (2) | 0.0359 (18) | 0.040 (2) | −0.0044 (13) | 0.0043 (16) | 0.0016 (13) |
C3 | 0.041 (2) | 0.035 (2) | 0.036 (3) | 0.000 | 0.009 (2) | 0.000 |
C4 | 0.043 (2) | 0.037 (2) | 0.031 (2) | 0.000 | 0.004 (2) | 0.000 |
C5 | 0.0574 (19) | 0.0297 (15) | 0.045 (2) | 0.0031 (13) | 0.0129 (15) | 0.0019 (13) |
C6 | 0.065 (2) | 0.090 (3) | 0.074 (3) | 0.012 (2) | 0.020 (2) | −0.015 (2) |
C7 | 0.090 (3) | 0.045 (2) | 0.052 (2) | 0.0020 (17) | 0.008 (2) | 0.0111 (16) |
Geometric parameters (Å, º) top
O1—N2 | 1.274 (3) | C4—N2i | 1.337 (3) |
N1—C1i | 1.340 (4) | C5—C6 | 1.519 (5) |
N1—C1 | 1.340 (4) | C5—C7 | 1.521 (4) |
N2—C4 | 1.337 (3) | C5—C5i | 1.558 (6) |
N2—C5 | 1.512 (4) | C6—H6A | 0.9600 |
C1—C2 | 1.376 (4) | C6—H6B | 0.9600 |
C1—H1 | 0.9300 | C6—H6C | 0.9600 |
C2—C3 | 1.395 (3) | C7—H7A | 0.9600 |
C2—H2 | 0.9300 | C7—H7B | 0.9600 |
C3—C2i | 1.395 (3) | C7—H7C | 0.9600 |
C3—C4 | 1.475 (6) | | |
| | | |
C1i—N1—C1 | 115.1 (4) | N2—C5—C7 | 107.7 (3) |
O1—N2—C4 | 126.8 (3) | C6—C5—C7 | 109.9 (3) |
O1—N2—C5 | 119.8 (2) | N2—C5—C5i | 101.58 (14) |
C4—N2—C5 | 113.2 (2) | C6—C5—C5i | 115.0 (3) |
N1—C1—C2 | 125.0 (3) | C7—C5—C5i | 115.1 (3) |
N1—C1—H1 | 117.5 | C5—C6—H6A | 109.5 |
C2—C1—H1 | 117.5 | C5—C6—H6B | 109.5 |
C1—C2—C3 | 118.9 (3) | H6A—C6—H6B | 109.5 |
C1—C2—H2 | 120.6 | C5—C6—H6C | 109.5 |
C3—C2—H2 | 120.6 | H6A—C6—H6C | 109.5 |
C2—C3—C2i | 117.2 (4) | H6B—C6—H6C | 109.5 |
C2—C3—C4 | 121.41 (19) | C5—C7—H7A | 109.5 |
C2i—C3—C4 | 121.41 (19) | C5—C7—H7B | 109.5 |
N2i—C4—N2 | 109.3 (4) | H7A—C7—H7B | 109.5 |
N2i—C4—C3 | 125.36 (18) | C5—C7—H7C | 109.5 |
N2—C4—C3 | 125.36 (18) | H7A—C7—H7C | 109.5 |
N2—C5—C6 | 106.5 (3) | H7B—C7—H7C | 109.5 |
| | | |
C1i—N1—C1—C2 | 1.2 (2) | C2i—C3—C4—N2i | −22.8 (2) |
N1—C1—C2—C3 | −2.4 (5) | C2—C3—C4—N2 | −22.8 (2) |
C1—C2—C3—C2i | 1.1 (2) | C2i—C3—C4—N2 | 157.2 (2) |
C1—C2—C3—C4 | −178.9 (2) | O1—N2—C5—C6 | −64.5 (4) |
O1—N2—C4—N2i | 179.5 (4) | C4—N2—C5—C6 | 111.5 (3) |
C5—N2—C4—N2i | 3.84 (16) | O1—N2—C5—C7 | 53.4 (4) |
O1—N2—C4—C3 | −0.5 (4) | C4—N2—C5—C7 | −130.6 (3) |
C5—N2—C4—C3 | −176.16 (16) | O1—N2—C5—C5i | 174.7 (3) |
C2—C3—C4—N2i | 157.2 (2) | C4—N2—C5—C5i | −9.3 (4) |
Symmetry code: (i) −x, y, −z+1/2. |