In the title compound, C
7H
14N
2O
4, peptide molecules are connected into β-sheet-like ribbons along the short tetragonal axis [4.7065 (4) Å] by one N—H
O and two C
α;—H
O interactions.
Supporting information
CCDC reference: 277274
Key indicators
- Single-crystal X-ray study
- T = 105 K
- Mean (C-C) = 0.002 Å
- R factor = 0.029
- wR factor = 0.074
- Data-to-parameter ratio = 8.7
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 3.00 Ratio
PLAT222_ALERT_3_C Large Non-Solvent H Ueq(max)/Ueq(min) ... 3.87 Ratio
Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
correct. If it is not, please give the correct count in the
_publ_section_exptl_refinement section of the submitted CIF.
From the CIF: _diffrn_reflns_theta_max 27.85
From the CIF: _reflns_number_total 1207
Count of symmetry unique reflns 1216
Completeness (_total/calc) 99.26%
TEST3: Check Friedels for noncentro structure
Estimate of Friedel pairs measured 0
Fraction of Friedel pairs measured 0.000
Are heavy atom types Z>Si present no
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
2 ALERT level C = Check and explain
1 ALERT level G = General alerts; check
0 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
Data collection: SMART (Bruker, 1998); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXTL (Bruker, 2000); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Crystal data top
C7H14N2O4 | Dx = 1.387 Mg m−3 |
Mr = 190.20 | Mo Kα radiation, λ = 0.71073 Å |
Tetragonal, P42 | Cell parameters from 3024 reflections |
Hall symbol: P 4c | θ = 2.1–27.9° |
a = 13.9136 (7) Å | µ = 0.11 mm−1 |
c = 4.7065 (4) Å | T = 105 K |
V = 911.12 (10) Å3 | Needle, colourless |
Z = 4 | 0.45 × 0.05 × 0.05 mm |
F(000) = 408 | |
Data collection top
Siemens SMART CCD diffractometer | 1207 independent reflections |
Radiation source: fine-focus sealed tube | 1097 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.032 |
Detector resolution: 8.3 pixels mm-1 | θmax = 27.9°, θmin = 2.1° |
ω scans | h = −10→18 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −17→16 |
Tmin = 0.905, Tmax = 0.994 | l = −6→6 |
6059 measured reflections | |
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)] = 0.029 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.074 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0409P)2 + 0.119P] where P = (Fo2 + 2Fc2)/3 |
1207 reflections | (Δ/σ)max = 0.002 |
138 parameters | Δρmax = 0.22 e Å−3 |
2 restraints | Δρmin = −0.17 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. Data were collected by measuring three sets of exposures with the detector set
at 2θ = 29°, crystal-to-detector distance 5.00 cm. Refinement of F2
against ALL reflections. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
O1 | 0.28513 (10) | 0.80250 (11) | 1.0257 (3) | 0.0271 (3) | |
O2 | 0.54581 (9) | 0.74841 (9) | 0.5354 (3) | 0.0212 (3) | |
H5 | 0.5802 (17) | 0.7842 (18) | 0.637 (6) | 0.032* | |
O3 | 0.11041 (8) | 0.62550 (8) | 0.3569 (3) | 0.0189 (3) | |
O4 | 0.00409 (9) | 0.62187 (10) | 0.7115 (3) | 0.0250 (3) | |
N1 | 0.42505 (10) | 0.90436 (10) | 0.7087 (4) | 0.0143 (3) | |
H1 | 0.4058 (15) | 0.9506 (16) | 0.583 (6) | 0.021* | |
H2 | 0.4919 (15) | 0.9029 (14) | 0.702 (5) | 0.021* | |
H3 | 0.4053 (16) | 0.9215 (15) | 0.881 (6) | 0.021* | |
N2 | 0.21644 (11) | 0.76639 (11) | 0.6040 (4) | 0.0159 (3) | |
H4 | 0.2248 (15) | 0.7631 (15) | 0.432 (5) | 0.019* | |
C1 | 0.38596 (12) | 0.80918 (12) | 0.6153 (4) | 0.0128 (3) | |
H11 | 0.3745 (14) | 0.8108 (14) | 0.418 (6) | 0.015* | |
C2 | 0.45825 (11) | 0.72863 (11) | 0.6831 (4) | 0.0153 (3) | |
H21 | 0.4704 | 0.7260 | 0.8924 | 0.018* | |
C3 | 0.42047 (13) | 0.63251 (12) | 0.5800 (5) | 0.0225 (4) | |
H31 | 0.4694 | 0.5829 | 0.6102 | 0.034* | |
H32 | 0.4053 | 0.6368 | 0.3770 | 0.034* | |
H33 | 0.3622 | 0.6158 | 0.6861 | 0.034* | |
C4 | 0.29002 (12) | 0.79267 (12) | 0.7659 (4) | 0.0146 (4) | |
C5 | 0.12218 (12) | 0.74402 (12) | 0.7249 (4) | 0.0177 (4) | |
H51 | 0.1307 | 0.7310 | 0.9323 | 0.021* | |
C6 | 0.05392 (15) | 0.82982 (14) | 0.6925 (7) | 0.0384 (6) | |
H61 | 0.0806 | 0.8855 | 0.7925 | 0.058* | |
H62 | −0.0089 | 0.8135 | 0.7737 | 0.058* | |
H63 | 0.0464 | 0.8452 | 0.4906 | 0.058* | |
C7 | 0.07707 (11) | 0.65561 (12) | 0.5891 (4) | 0.0152 (3) | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1 | 0.0207 (7) | 0.0490 (9) | 0.0118 (6) | −0.0107 (6) | −0.0001 (6) | −0.0024 (7) |
O2 | 0.0146 (6) | 0.0203 (7) | 0.0289 (8) | −0.0027 (4) | 0.0042 (6) | −0.0067 (6) |
O3 | 0.0188 (6) | 0.0200 (6) | 0.0178 (7) | −0.0017 (4) | 0.0024 (6) | −0.0038 (6) |
O4 | 0.0212 (6) | 0.0366 (7) | 0.0172 (6) | −0.0128 (5) | 0.0036 (6) | −0.0029 (6) |
N1 | 0.0138 (7) | 0.0127 (7) | 0.0163 (8) | 0.0001 (5) | 0.0008 (6) | −0.0002 (7) |
N2 | 0.0144 (7) | 0.0231 (7) | 0.0101 (6) | −0.0042 (5) | 0.0009 (6) | −0.0014 (6) |
C1 | 0.0143 (8) | 0.0136 (8) | 0.0106 (8) | −0.0028 (6) | −0.0017 (7) | −0.0008 (7) |
C2 | 0.0152 (8) | 0.0149 (8) | 0.0159 (8) | 0.0009 (6) | 0.0008 (7) | 0.0004 (7) |
C3 | 0.0225 (9) | 0.0146 (8) | 0.0303 (11) | −0.0015 (6) | 0.0020 (9) | −0.0024 (8) |
C4 | 0.0156 (8) | 0.0155 (8) | 0.0126 (9) | −0.0014 (6) | 0.0002 (7) | 0.0017 (7) |
C5 | 0.0146 (8) | 0.0230 (9) | 0.0155 (8) | −0.0031 (6) | 0.0031 (7) | −0.0043 (8) |
C6 | 0.0217 (9) | 0.0253 (10) | 0.0683 (18) | 0.0011 (8) | 0.0067 (11) | −0.0114 (13) |
C7 | 0.0139 (7) | 0.0175 (8) | 0.0141 (8) | 0.0005 (6) | −0.0021 (7) | 0.0009 (7) |
Geometric parameters (Å, º) top
O1—C4 | 1.232 (2) | C1—C2 | 1.539 (2) |
O2—C2 | 1.429 (2) | C1—H11 | 0.94 (3) |
O2—H5 | 0.84 (3) | C2—C3 | 1.517 (2) |
O3—C7 | 1.259 (2) | C2—H21 | 1.0000 |
O4—C7 | 1.258 (2) | C3—H31 | 0.9800 |
N1—C1 | 1.498 (2) | C3—H32 | 0.9800 |
N1—H1 | 0.91 (2) | C3—H33 | 0.9800 |
N1—H2 | 0.93 (2) | C5—C7 | 1.522 (2) |
N1—H3 | 0.89 (3) | C5—C6 | 1.533 (3) |
N2—C4 | 1.328 (2) | C5—H51 | 1.0000 |
N2—C5 | 1.463 (2) | C6—H61 | 0.9800 |
N2—H4 | 0.82 (2) | C6—H62 | 0.9800 |
C1—C4 | 1.529 (2) | C6—H63 | 0.9800 |
| | | |
C2—O2—H5 | 108.9 (18) | C2—C3—H32 | 109.5 |
C1—N1—H1 | 109.0 (14) | H31—C3—H32 | 109.5 |
C1—N1—H2 | 109.5 (13) | C2—C3—H33 | 109.5 |
H1—N1—H2 | 106.6 (19) | H31—C3—H33 | 109.5 |
C1—N1—H3 | 113.1 (14) | H32—C3—H33 | 109.5 |
H1—N1—H3 | 108 (2) | O1—C4—N2 | 123.90 (17) |
H2—N1—H3 | 110 (2) | O1—C4—C1 | 119.45 (17) |
C4—N2—C5 | 121.78 (16) | N2—C4—C1 | 116.65 (16) |
C4—N2—H4 | 118.2 (15) | N2—C5—C7 | 112.24 (15) |
C5—N2—H4 | 120.0 (15) | N2—C5—C6 | 110.56 (16) |
N1—C1—C4 | 108.29 (14) | C7—C5—C6 | 109.41 (16) |
N1—C1—C2 | 110.22 (13) | N2—C5—H51 | 108.2 |
C4—C1—C2 | 111.41 (14) | C7—C5—H51 | 108.2 |
N1—C1—H11 | 109.2 (12) | C6—C5—H51 | 108.2 |
C4—C1—H11 | 108.2 (12) | C5—C6—H61 | 109.5 |
C2—C1—H11 | 109.4 (12) | C5—C6—H62 | 109.5 |
O2—C2—C3 | 108.02 (14) | H61—C6—H62 | 109.5 |
O2—C2—C1 | 108.41 (13) | C5—C6—H63 | 109.5 |
C3—C2—C1 | 110.43 (14) | H61—C6—H63 | 109.5 |
O2—C2—H21 | 110.0 | H62—C6—H63 | 109.5 |
C3—C2—H21 | 110.0 | O4—C7—O3 | 124.79 (16) |
C1—C2—H21 | 110.0 | O4—C7—C5 | 116.25 (16) |
C2—C3—H31 | 109.5 | O3—C7—C5 | 118.78 (15) |
| | | |
N1—C1—C4—N2 | 130.52 (16) | C5—N2—C4—O1 | −1.7 (3) |
C1—C4—N2—C5 | 177.03 (15) | N1—C1—C4—O1 | −50.7 (2) |
C4—N2—C5—C7 | −137.75 (17) | C2—C1—C4—O1 | 70.7 (2) |
N2—C5—C7—O3 | −16.2 (2) | C2—C1—C4—N2 | −108.11 (18) |
N1—C1—C2—O2 | −59.93 (19) | C4—N2—C5—C6 | 99.8 (2) |
N1—C1—C2—C3 | −178.09 (16) | N2—C5—C7—O4 | 168.46 (16) |
C1—C2—O2—H5 | 87.2 (18) | C6—C5—C7—O4 | −68.4 (2) |
C4—C1—C2—O2 | 179.82 (15) | C6—C5—C7—O3 | 107.0 (2) |
C4—C1—C2—C3 | 61.7 (2) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O4i | 0.91 (2) | 1.94 (3) | 2.798 (2) | 156 (2) |
N1—H2···O3ii | 0.93 (2) | 2.01 (2) | 2.8822 (19) | 156 (2) |
N1—H3···O4iii | 0.89 (3) | 1.97 (3) | 2.820 (2) | 159 (2) |
N2—H4···O1iv | 0.82 (2) | 2.16 (2) | 2.928 (2) | 156 (2) |
O2—H5···O3ii | 0.84 (3) | 1.90 (3) | 2.7163 (19) | 163 (2) |
C1—H11···O1iv | 0.94 (3) | 2.23 (2) | 3.111 (2) | 155.4 (17) |
C3—H33···O2v | 0.98 | 2.45 | 3.402 (3) | 163 |
C5—H51···O3vi | 1.00 | 2.50 | 3.405 (2) | 151 |
Symmetry codes: (i) −y+1, x+1, z−1/2; (ii) y, −x+1, z+1/2; (iii) −y+1, x+1, z+1/2; (iv) x, y, z−1; (v) −y+1, x, z+1/2; (vi) x, y, z+1. |