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The case of prototropic annular tautomerism in an imidazole derivative has been found. The crystal structure contains a 50:50 mixture of two tautomers: 4-nitro-5-methoxyimidazole and 5-nitro-4-methoxyimidazole. The X-ray experiment actually shows the superposition of these compounds; it appears as if the structure is centrosymmetric and the N—H hydrogen atoms are disordered over two ring N atoms. Owing to the hydrogen-bond pattern, the values of their site occupation factors have to be exactly equal to 1/2. The molecules are connected into a three-dimensional network by means of N—H...N and C—H...O hydrogen bonds.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S0108768104003179/bk5004sup1.cif
Contains datablocks global, 1, 2

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S0108768104003179/bk50041sup2.hkl
Contains datablock 1

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S0108768104003179/bk50042sup3.hkl
Contains datablock 2

CCDC references: 237249; 237250

Computing details top

For both compounds, data collection: CrysAlis CCD v.169; cell refinement: CrysAlis CCD v.169; data reduction: CrysAlis RED v.169; program(s) used to solve structure: SHELXS97 (Sheldrick, 1990); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997).

Figures top
[Figure 1]
[Figure 2]
[Figure 3]
[Figure 4]
(1) 4(5)-nitro-5(4)-methoxy-1H-imidazole top
Crystal data top
C4H5N3O3F(000) = 592
Mr = 143.11Dx = 1.660 Mg m3
Monoclinic, C2/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2ycCell parameters from 4048 reflections
a = 7.5542 (6) Åθ = 4–22°
b = 11.3112 (9) ŵ = 0.14 mm1
c = 13.4773 (10) ÅT = 90 K
β = 95.920 (6)°Prism, colourless
V = 1145.45 (15) Å30.2 × 0.2 × 0.1 mm
Z = 8
Data collection top
KUMA KM4CCD four-circle
diffractometer
1513 independent reflections
Radiation source: fine-focus sealed tube1266 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.030
/w scanθmax = 29.0°, θmin = 3.3°
Absorption correction: multi-scan
SORTAV (Blessing, 1989)
h = 107
Tmin = 0.983, Tmax = 0.984k = 1515
7556 measured reflectionsl = 1718
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.031Hydrogen site location: difference Fourier map
wR(F2) = 0.080All H-atom parameters refined
S = 1.10 w = 1/[σ2(Fo2) + (0.0464P)2 + 0.0996P]
where P = (Fo2 + 2Fc2)/3
1567 reflections(Δ/σ)max < 0.001
115 parametersΔρmax = 0.26 e Å3
0 restraintsΔρmin = 0.26 e Å3
Crystal data top
C4H5N3O3V = 1145.45 (15) Å3
Mr = 143.11Z = 8
Monoclinic, C2/cMo Kα radiation
a = 7.5542 (6) ŵ = 0.14 mm1
b = 11.3112 (9) ÅT = 90 K
c = 13.4773 (10) Å0.2 × 0.2 × 0.1 mm
β = 95.920 (6)°
Data collection top
KUMA KM4CCD four-circle
diffractometer
1513 independent reflections
Absorption correction: multi-scan
SORTAV (Blessing, 1989)
1266 reflections with I > 2σ(I)
Tmin = 0.983, Tmax = 0.984Rint = 0.030
7556 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0310 restraints
wR(F2) = 0.080All H-atom parameters refined
S = 1.10Δρmax = 0.26 e Å3
1567 reflectionsΔρmin = 0.26 e Å3
115 parameters
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
xyzUiso*/UeqOcc. (<1)
N10.59381 (11)0.92865 (7)0.34804 (6)0.01395 (19)
H10.533 (3)0.927 (2)0.2932 (18)0.017 (6)*0.50
C20.75692 (13)0.98053 (9)0.36613 (7)0.0155 (2)
H20.8117 (15)1.0230 (11)0.3179 (9)0.018 (3)*
N30.82832 (11)0.96510 (7)0.45830 (6)0.01428 (19)
H30.936 (3)0.988 (2)0.4810 (19)0.017 (6)*0.50
C40.70651 (12)0.89944 (8)0.50417 (7)0.0134 (2)
N40.73546 (11)0.86677 (7)0.60484 (6)0.01406 (18)
O410.62036 (10)0.80732 (7)0.64056 (5)0.02048 (19)
O420.87603 (9)0.89940 (7)0.65360 (5)0.01926 (18)
C50.56102 (12)0.87666 (8)0.43511 (7)0.0129 (2)
O50.41617 (9)0.81572 (6)0.45016 (5)0.01594 (17)
C510.28526 (14)0.80036 (10)0.36430 (7)0.0184 (2)
H51A0.1936 (17)0.7555 (11)0.3893 (10)0.020 (3)*
H51B0.3403 (18)0.7604 (11)0.3098 (10)0.024 (3)*
H51C0.2343 (18)0.8776 (11)0.3405 (11)0.026 (3)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
N10.0140 (4)0.0166 (4)0.0109 (4)0.0006 (3)0.0006 (3)0.0007 (3)
C20.0164 (5)0.0173 (5)0.0125 (5)0.0017 (4)0.0004 (3)0.0007 (3)
N30.0134 (4)0.0174 (4)0.0118 (4)0.0013 (3)0.0002 (3)0.0003 (3)
C40.0131 (4)0.0157 (4)0.0111 (4)0.0001 (3)0.0005 (3)0.0000 (3)
N40.0126 (4)0.0167 (4)0.0126 (4)0.0007 (3)0.0000 (3)0.0009 (3)
O410.0166 (4)0.0290 (4)0.0160 (4)0.0047 (3)0.0020 (3)0.0043 (3)
O420.0153 (4)0.0277 (4)0.0137 (4)0.0030 (3)0.0038 (3)0.0007 (3)
C50.0134 (4)0.0135 (4)0.0118 (4)0.0014 (3)0.0015 (3)0.0009 (3)
O50.0128 (3)0.0222 (4)0.0124 (3)0.0049 (3)0.0009 (2)0.0010 (3)
C510.0149 (5)0.0246 (5)0.0147 (5)0.0056 (4)0.0034 (4)0.0017 (4)
Geometric parameters (Å, º) top
N1—C51.3580 (12)C4—N41.4014 (12)
N1—C21.3638 (13)N4—O411.2354 (10)
N1—H10.83 (2)N4—O421.2457 (11)
C2—N31.3139 (12)C5—O51.3265 (12)
C2—H20.938 (12)O5—C511.4530 (11)
N3—C41.3776 (12)C51—H51A0.948 (13)
N3—H30.87 (2)C51—H51B0.991 (13)
C4—C51.3891 (13)C51—H51C0.995 (13)
C5—N1—C2105.89 (8)O41—N4—C4118.36 (8)
C5—N1—H1128.6 (17)O42—N4—C4118.17 (8)
C2—N1—H1125.4 (17)O5—C5—N1125.74 (8)
N3—C2—N1112.77 (9)O5—C5—C4127.02 (8)
N3—C2—H2123.7 (8)N1—C5—C4107.25 (8)
N1—C2—H2123.5 (7)C5—O5—C51116.40 (7)
C2—N3—C4105.53 (8)O5—C51—H51A104.1 (8)
C2—N3—H3124.5 (17)O5—C51—H51B110.0 (8)
C4—N3—H3129.7 (17)H51A—C51—H51B113.4 (11)
N3—C4—C5108.56 (8)O5—C51—H51C111.2 (8)
N3—C4—N4122.13 (8)H51A—C51—H51C108.2 (10)
C5—C4—N4129.31 (9)H51B—C51—H51C109.9 (11)
O41—N4—O42123.47 (8)
C5—N1—C2—N30.20 (11)C2—N1—C5—O5179.69 (9)
N1—C2—N3—C40.01 (11)C2—N1—C5—C40.31 (10)
C2—N3—C4—C50.19 (11)N3—C4—C5—O5179.68 (9)
C2—N3—C4—N4178.97 (9)N4—C4—C5—O51.24 (17)
N3—C4—N4—O41179.65 (8)N3—C4—C5—N10.31 (11)
C5—C4—N4—O411.39 (15)N4—C4—C5—N1178.76 (9)
N3—C4—N4—O420.44 (13)N1—C5—O5—C512.38 (14)
C5—C4—N4—O42178.53 (9)C4—C5—O5—C51177.62 (9)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H1···N1i0.83 (2)2.04 (3)2.8670 (16)174 (2)
C2—H2···O42ii0.938 (12)2.477 (12)3.3749 (12)160.4 (10)
C2—H2···O42iii0.938 (12)2.509 (12)3.1235 (13)123.3 (9)
N3—H3···N3iii0.87 (2)1.96 (2)2.8307 (17)176 (2)
C51—H51A···O41iv0.948 (13)2.469 (13)3.2918 (13)145.2 (11)
C51—H51A···O5iv0.948 (13)2.528 (13)3.3283 (13)142.3 (11)
C51—H51C···O42v0.995 (13)2.660 (13)3.6077 (14)159.3 (11)
Symmetry codes: (i) x+1, y, z+1/2; (ii) x, y+2, z1/2; (iii) x+2, y+2, z+1; (iv) x+1/2, y+3/2, z+1; (v) x+1, y+2, z+1.
(2) 4(5)-nitro-5(4)-methoxy-1H-imidazole top
Crystal data top
C4H5N3O3F(000) = 592
Mr = 143.11Dx = 1.660 Mg m3
Monoclinic, CcMo Kα radiation, λ = 0.71073 Å
Hall symbol: C -2ycCell parameters from 4048 reflections
a = 7.5542 (6) Åθ = 4–22°
b = 11.3112 (9) ŵ = 0.14 mm1
c = 13.4773 (10) ÅT = 90 K
β = 95.920 (6)°Prism, colourless
V = 1145.45 (15) Å30.2 × 0.2 × 0.1 mm
Z = 8
Data collection top
KUMA KM4CCD four-circle
diffractometer
2380 independent reflections
Radiation source: fine-focus sealed tube1876 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.030
/w scanθmax = 29.9°, θmin = 3.0°
Absorption correction: multi-scan
SORTAV (Blessing, 1989)
h = 107
Tmin = 0.983, Tmax = 0.984k = 1515
7556 measured reflectionsl = 1718
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: full with fixed elements per cycleHydrogen site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.029H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.074 w = 1/[σ2(Fo2) + (0.043P)2]
where P = (Fo2 + 2Fc2)/3
S = 1.06(Δ/σ)max = 0.120
2380 reflectionsΔρmax = 0.22 e Å3
193 parametersΔρmin = 0.26 e Å3
2 restraintsAbsolute structure: Flack H D (1983), Acta Cryst. A39, 876-881
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 1 (2)
Crystal data top
C4H5N3O3V = 1145.45 (15) Å3
Mr = 143.11Z = 8
Monoclinic, CcMo Kα radiation
a = 7.5542 (6) ŵ = 0.14 mm1
b = 11.3112 (9) ÅT = 90 K
c = 13.4773 (10) Å0.2 × 0.2 × 0.1 mm
β = 95.920 (6)°
Data collection top
KUMA KM4CCD four-circle
diffractometer
2380 independent reflections
Absorption correction: multi-scan
SORTAV (Blessing, 1989)
1876 reflections with I > 2σ(I)
Tmin = 0.983, Tmax = 0.984Rint = 0.030
7556 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.029H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.074(Δ/σ)max = 0.120
S = 1.06Δρmax = 0.22 e Å3
2380 reflectionsΔρmin = 0.26 e Å3
193 parametersAbsolute structure: Flack H D (1983), Acta Cryst. A39, 876-881
2 restraintsAbsolute structure parameter: 1 (2)
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
xyzUiso*/Ueq
N1A0.66219 (18)0.57146 (11)0.62985 (9)0.0131 (3)
H1A0.599 (2)0.5720 (16)0.5774 (14)0.016*
C2A0.8234 (2)0.52011 (13)0.64684 (11)0.0161 (3)
H2A0.887 (2)0.4872 (16)0.5987 (14)0.019*
N3A0.89693 (17)0.53538 (11)0.74040 (9)0.0136 (3)
C4A0.7737 (2)0.59970 (13)0.78532 (11)0.0150 (3)
N4A0.80112 (18)0.63272 (11)0.88544 (10)0.0166 (3)
O41A0.94363 (15)0.60129 (10)0.93578 (8)0.0195 (3)
O42A0.68542 (16)0.69258 (10)0.92218 (9)0.0228 (3)
C5A0.6291 (2)0.62301 (13)0.71860 (10)0.0147 (3)
O5A0.48477 (14)0.68369 (9)0.73264 (7)0.0148 (3)
C51A0.3524 (2)0.70014 (14)0.64674 (11)0.0178 (3)
H51A0.30280.62320.62500.023*
H51B0.40880.73680.59210.023*
H51C0.25670.75140.66550.023*
N1B0.24025 (18)0.53451 (11)0.32375 (10)0.0153 (3)
H1B0.132 (2)0.5114 (16)0.2996 (14)0.018*
C2B0.3096 (2)0.51884 (13)0.41458 (12)0.0149 (3)
H2B0.260 (2)0.4701 (15)0.4623 (14)0.018*
N3B0.47439 (17)0.57134 (12)0.43354 (9)0.0153 (3)
C4B0.50660 (19)0.62351 (12)0.34835 (11)0.0116 (3)
O4B0.65256 (15)0.68485 (9)0.33247 (8)0.0173 (3)
C41B0.7821 (2)0.69912 (15)0.41801 (11)0.0194 (4)
H41A0.72840.74260.47020.025*
H41B0.88470.74320.39860.025*
H41C0.82110.62120.44340.025*
C5B0.36094 (19)0.60132 (13)0.27712 (10)0.0121 (3)
N5B0.33021 (17)0.63350 (10)0.17595 (9)0.0118 (3)
O51B0.44495 (15)0.69273 (10)0.14108 (8)0.0186 (3)
O52B0.19160 (15)0.59979 (10)0.12861 (8)0.0196 (3)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
N1A0.0165 (7)0.0131 (6)0.0098 (6)0.0040 (5)0.0025 (5)0.0021 (4)
C2A0.0209 (9)0.0162 (7)0.0104 (7)0.0025 (6)0.0025 (6)0.0035 (5)
N3A0.0111 (6)0.0204 (6)0.0088 (6)0.0009 (5)0.0020 (5)0.0001 (5)
C4A0.0211 (9)0.0139 (7)0.0101 (7)0.0049 (6)0.0014 (6)0.0001 (5)
N4A0.0118 (6)0.0209 (7)0.0168 (7)0.0030 (5)0.0002 (5)0.0077 (5)
O41A0.0121 (6)0.0296 (6)0.0156 (6)0.0030 (5)0.0036 (4)0.0045 (4)
O42A0.0193 (6)0.0301 (7)0.0195 (6)0.0039 (5)0.0046 (5)0.0040 (5)
C5A0.0216 (8)0.0159 (7)0.0081 (6)0.0032 (6)0.0088 (6)0.0042 (5)
O5A0.0133 (5)0.0222 (6)0.0079 (5)0.0035 (4)0.0032 (4)0.0005 (4)
C51A0.0150 (8)0.0219 (8)0.0155 (8)0.0039 (6)0.0027 (6)0.0016 (6)
N1B0.0157 (7)0.0149 (6)0.0156 (6)0.0016 (5)0.0027 (5)0.0003 (5)
C2B0.0126 (7)0.0181 (7)0.0143 (7)0.0055 (6)0.0027 (6)0.0022 (5)
N3B0.0124 (6)0.0208 (6)0.0118 (6)0.0025 (5)0.0033 (5)0.0007 (5)
C4B0.0065 (7)0.0113 (6)0.0158 (7)0.0001 (5)0.0043 (5)0.0061 (5)
O4B0.0124 (6)0.0222 (6)0.0173 (6)0.0063 (4)0.0018 (4)0.0020 (4)
C41B0.0162 (8)0.0271 (9)0.0138 (7)0.0074 (6)0.0043 (6)0.0021 (6)
C5B0.0067 (7)0.0176 (7)0.0118 (7)0.0043 (5)0.0000 (5)0.0002 (5)
N5B0.0129 (6)0.0128 (6)0.0096 (5)0.0042 (5)0.0004 (5)0.0051 (4)
O51B0.0141 (6)0.0282 (6)0.0131 (5)0.0054 (5)0.0002 (4)0.0045 (4)
O52B0.0189 (6)0.0270 (6)0.0117 (5)0.0031 (5)0.0043 (4)0.0054 (4)
Geometric parameters (Å, º) top
N1A—C2A1.347 (2)N1B—C2B1.293 (2)
N1A—C5A1.3766 (18)N1B—C5B1.3840 (19)
N1A—H1A0.810 (18)N1B—H1B0.890 (16)
C2A—N3A1.3355 (19)C2B—N3B1.379 (2)
C2A—H2A0.925 (19)C2B—H2B0.951 (18)
N3A—C4A1.3705 (19)N3B—C4B1.335 (2)
C4A—C5A1.367 (2)C4B—O4B1.3385 (18)
C4A—N4A1.3948 (19)C4B—C5B1.4063 (19)
N4A—O42A1.2477 (17)O4B—C41B1.4420 (18)
N4A—O41A1.2629 (16)C41B—H41A0.9800
C5A—O5A1.3183 (19)C41B—H41B0.9800
O5A—C51A1.4616 (17)C41B—H41C0.9800
C51A—H51A0.9800C5B—N5B1.4071 (18)
C51A—H51B0.9800N5B—O51B1.2267 (16)
C51A—H51C0.9800N5B—O52B1.2293 (16)
C2A—N1A—C5A106.08 (13)C2B—N1B—C5B106.45 (13)
C2A—N1A—H1A126.2 (13)C2B—N1B—H1B125.0 (13)
C5A—N1A—H1A127.7 (13)C5B—N1B—H1B128.3 (13)
N3A—C2A—N1A112.66 (14)N1B—C2B—N3B112.72 (14)
N3A—C2A—H2A121.2 (11)N1B—C2B—H2B124.8 (11)
N1A—C2A—H2A125.5 (11)N3B—C2B—H2B122.2 (11)
C2A—N3A—C4A104.51 (13)C4B—N3B—C2B105.78 (12)
C5A—C4A—N3A110.18 (12)N3B—C4B—O4B126.35 (13)
C5A—C4A—N4A127.83 (14)N3B—C4B—C5B108.00 (13)
N3A—C4A—N4A122.00 (14)O4B—C4B—C5B125.65 (13)
O42A—N4A—O41A122.19 (13)C4B—O4B—C41B115.61 (11)
O42A—N4A—C4A119.29 (13)O4B—C41B—H41A109.5
O41A—N4A—C4A118.52 (13)O4B—C41B—H41B109.5
O5A—C5A—C4A128.51 (13)H41A—C41B—H41B109.5
O5A—C5A—N1A124.91 (14)O4B—C41B—H41C109.5
C4A—C5A—N1A106.58 (13)H41A—C41B—H41C109.5
C5A—O5A—C51A117.46 (11)H41B—C41B—H41C109.5
O5A—C51A—H51A109.5N1B—C5B—C4B107.05 (13)
O5A—C51A—H51B109.5N1B—C5B—N5B122.05 (13)
H51A—C51A—H51B109.5C4B—C5B—N5B130.89 (14)
O5A—C51A—H51C109.5O51B—N5B—O52B124.63 (12)
H51A—C51A—H51C109.5O51B—N5B—C5B117.39 (12)
H51B—C51A—H51C109.5O52B—N5B—C5B117.98 (12)
C5A—N1A—C2A—N3A0.25 (18)C5B—N1B—C2B—N3B0.32 (18)
N1A—C2A—N3A—C4A0.43 (17)N1B—C2B—N3B—C4B0.59 (18)
C2A—N3A—C4A—C5A0.45 (17)C2B—N3B—C4B—O4B179.71 (14)
C2A—N3A—C4A—N4A179.18 (14)C2B—N3B—C4B—C5B0.60 (16)
C5A—C4A—N4A—O42A1.3 (2)N3B—C4B—O4B—C41B2.9 (2)
N3A—C4A—N4A—O42A179.09 (13)C5B—C4B—O4B—C41B178.12 (14)
C5A—C4A—N4A—O41A179.07 (14)C2B—N1B—C5B—C4B0.06 (16)
N3A—C4A—N4A—O41A0.5 (2)C2B—N1B—C5B—N5B178.74 (14)
N3A—C4A—C5A—O5A178.83 (14)N3B—C4B—C5B—N1B0.43 (16)
N4A—C4A—C5A—O5A1.6 (3)O4B—C4B—C5B—N1B179.55 (13)
N3A—C4A—C5A—N1A0.31 (17)N3B—C4B—C5B—N5B178.23 (14)
N4A—C4A—C5A—N1A179.29 (14)O4B—C4B—C5B—N5B0.9 (3)
C2A—N1A—C5A—O5A179.14 (14)N1B—C5B—N5B—O51B179.91 (13)
C2A—N1A—C5A—C4A0.05 (16)C4B—C5B—N5B—O51B1.4 (2)
C4A—C5A—O5A—C51A177.22 (15)N1B—C5B—N5B—O52B0.4 (2)
N1A—C5A—O5A—C51A1.8 (2)C4B—C5B—N5B—O52B178.05 (14)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1A—H1A···N3B0.810 (18)2.067 (19)2.8702 (13)171.3 (19)
C2A—H2A···O52Bi0.925 (19)2.496 (18)3.1268 (17)125.7 (14)
C51A—H51A···O52Bii0.982.663.6032 (16)161
C51A—H51C···O51Biii0.982.433.3013 (16)148
C51A—H51C···O4Biii0.982.563.3190 (16)134
C51A—H51B···O52Biv0.982.833.4463 (17)122
N1B—H1B···N3Av0.890 (16)1.941 (17)2.8306 (14)177.1 (19)
C2B—H2B···O52Bii0.951 (18)2.482 (18)3.3832 (19)158.1 (15)
C41B—H41A···O51Biv0.982.783.3595 (19)118
C41B—H41B···O42Avi0.982.383.2792 (17)153
C41B—H41B···O5Avi0.982.573.3366 (16)135
C41B—H41C···O41Avii0.982.693.6101 (18)157
Symmetry codes: (i) x+1, y+1, z+1/2; (ii) x, y+1, z+1/2; (iii) x1/2, y+3/2, z+1/2; (iv) x+1/2, y+3/2, z+1/2; (v) x1, y+1, z1/2; (vi) x+1/2, y+3/2, z1/2; (vii) x, y+1, z1/2.

Experimental details

(1)(2)
Crystal data
Chemical formulaC4H5N3O3C4H5N3O3
Mr143.11143.11
Crystal system, space groupMonoclinic, C2/cMonoclinic, Cc
Temperature (K)9090
a, b, c (Å)7.5542 (6), 11.3112 (9), 13.4773 (10)7.5542 (6), 11.3112 (9), 13.4773 (10)
β (°) 95.920 (6) 95.920 (6)
V3)1145.45 (15)1145.45 (15)
Z88
Radiation typeMo KαMo Kα
µ (mm1)0.140.14
Crystal size (mm)0.2 × 0.2 × 0.10.2 × 0.2 × 0.1
Data collection
DiffractometerKUMA KM4CCD four-circle
diffractometer
KUMA KM4CCD four-circle
diffractometer
Absorption correctionMulti-scan
SORTAV (Blessing, 1989)
Multi-scan
SORTAV (Blessing, 1989)
Tmin, Tmax0.983, 0.9840.983, 0.984
No. of measured, independent and
observed [I > 2σ(I)] reflections
7556, 1513, 1266 7556, 2380, 1876
Rint0.0300.030
(sin θ/λ)max1)0.6820.701
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.031, 0.080, 1.10 0.029, 0.074, 1.06
No. of reflections15672380
No. of parameters115193
No. of restraints02
H-atom treatmentAll H-atom parameters refinedH atoms treated by a mixture of independent and constrained refinement
(Δ/σ)max< 0.0010.120
Δρmax, Δρmin (e Å3)0.26, 0.260.22, 0.26
Absolute structure?Flack H D (1983), Acta Cryst. A39, 876-881
Absolute structure parameter?1 (2)

Computer programs: CrysAlis CCD v.169, CrysAlis RED v.169, SHELXS97 (Sheldrick, 1990), SHELXL97 (Sheldrick, 1997).

Selected geometric parameters (Å, º) for (1) top
N1—C51.3580 (12)N3—C41.3776 (12)
N1—C21.3638 (13)N4—O411.2354 (10)
C2—N31.3139 (12)N4—O421.2457 (11)
C5—N1—C2105.89 (8)C2—N3—C4105.53 (8)
Hydrogen-bond geometry (Å, º) for (1) top
D—H···AD—HH···AD···AD—H···A
N1—H1···N1i0.83 (2)2.04 (3)2.8670 (16)174 (2)
C2—H2···O42ii0.938 (12)2.477 (12)3.3749 (12)160.4 (10)
C2—H2···O42iii0.938 (12)2.509 (12)3.1235 (13)123.3 (9)
N3—H3···N3iii0.87 (2)1.96 (2)2.8307 (17)176 (2)
C51—H51A···O41iv0.948 (13)2.469 (13)3.2918 (13)145.2 (11)
C51—H51A···O5iv0.948 (13)2.528 (13)3.3283 (13)142.3 (11)
C51—H51C···O42v0.995 (13)2.660 (13)3.6077 (14)159.3 (11)
Symmetry codes: (i) x+1, y, z+1/2; (ii) x, y+2, z1/2; (iii) x+2, y+2, z+1; (iv) x+1/2, y+3/2, z+1; (v) x+1, y+2, z+1.
Hydrogen-bond geometry (Å, º) for (2) top
D—H···AD—HH···AD···AD—H···A
N1A—H1A···N3B0.810 (18)2.067 (19)2.8702 (13)171.3 (19)
C2A—H2A···O52Bi0.925 (19)2.496 (18)3.1268 (17)125.7 (14)
C51A—H51A···O52Bii0.982.663.6032 (16)161.4
C51A—H51C···O51Biii0.982.433.3013 (16)148.2
C51A—H51C···O4Biii0.982.563.3190 (16)134.0
C51A—H51B···O52Biv0.982.833.4463 (17)121.7
N1B—H1B···N3Av0.890 (16)1.941 (17)2.8306 (14)177.1 (19)
C2B—H2B···O52Bii0.951 (18)2.482 (18)3.3832 (19)158.1 (15)
C41B—H41A···O51Biv0.982.783.3595 (19)118.3
C41B—H41B···O42Avi0.982.383.2792 (17)153.1
C41B—H41B···O5Avi0.982.573.3366 (16)135.1
C41B—H41C···O41Avii0.982.693.6101 (18)157.2
Symmetry codes: (i) x+1, y+1, z+1/2; (ii) x, y+1, z+1/2; (iii) x1/2, y+3/2, z+1/2; (iv) x+1/2, y+3/2, z+1/2; (v) x1, y+1, z1/2; (vi) x+1/2, y+3/2, z1/2; (vii) x, y+1, z1/2.
 

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