organic compounds
1-(2-Hydroxyethyl)pyrrole-2,5-dione
aSchool of Chemical and Pharmaceutical Engineering, Shandong Institute of Light Industry, Jinan 250353, People's Republic of China
*Correspondence e-mail: tanxuejie@163.com
The 6H7NO3, contains two molecules (A and B) related by a non-crystallographic twofold pseudo-axis. The molecules are joined in the (AABB)n manner by O—H⋯O hydrogen bonds between their hydroxy groups, thus forming C(2) chains along the a-axis direction. Neighboring molecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hydroxy H atoms are disordered other two sets of sites with half occupancies (superimposed O—H⋯O and O⋯H—O fragments). The molecules are further linked by C—H⋯O interactions, which can be considered to be weak hydrogen bonds.
of the title compound, CRelated literature
For self-initiated et al. (2006); Ericsson (2001). For of N-substituted maleimides, see: Yamada et al. (1968). For applications of similar compounds, see: Stang & White (2011); Sanchez et al. (2011); Keller et al. (2005). For the synthesis of the title compound, see: Yamada et al. (1961); Gramlich et al. (2010); Heath et al. (2008).
see: ChengExperimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2000); cell SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL; software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536812008938/yk2042sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812008938/yk2042Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812008938/yk2042Isup3.cml
The title compound was synthesized using established method (Gramlich et al., 2010; Heath et al., 2008). Elemental analysis: Calcd: C 51.06; H 5.00; N 9.93%. Found: C 51.11; H 4.92; N 10.02%.
The C-bound H atoms were placed in calculated positions with C—H = 0.93–0.97 Å and allowed to ride on their parent atoms with Uiso(H) = 1.2Ueq(C). The disordered O-bound H atoms with half occupancies were refined with the O—H and C···H distances restrained to 0.82 (1) Å and 1.85 (2) Å and with Uiso(H) = 1.5Ueq(O).
Maleimides are a class of reactive "synthons" having a polymerizable double bond. They are particularly useful in manufacturing oligomers capable of self-initiated
(Cheng et al., 2006; Ericsson, 2001). The title compound, N-2-hydroxyethylmaleimide, first prepared in 1961 (Yamada et al., 1961), is a well-known maleimide that has been intensively studied during last years (Stang & White, 2011; Sanchez et al., 2011; Keller et al., 2005). However its has not been determined. In this work, the of the title compound is reported, and its molecular packing mode is discussed.As shown in Fig. 1, the
of the title compound contains two molecules (A and B) related by the non-crystallographic two-fold pseudo-axis. The molecules are joined in the (AABB)n manner by O—H···O hydrogen bonds between their hydroxy groups, thus forming the C(2) chains stretched along the a-axis direction. The neighboring molecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hydroxy hydrogen atoms are disordered other two sets of sites with half occupancies, thus the fragments O—H···O and O···H—O are superimposed. The molecules are further linked by intermolecular C—H···O interactions, which can be considered as weak hydrogen bonds.Instead of helices, hydrogen bonds make (I) pack into zigzag-type pleated sheets stretched along (0 0 1) planes (Fig. 2). Adjacent sheets are arranged in an antiparallel manner, yielding an ABAB layer sequence. Either O—H···O and C—H···O interactions or no such interactions occur between adjacent sheets. As can be seen, the hydrogen-bonded sheets are rather closely spaced in the lattice (3.9103 (9) Å) than no-hydrogen-bonded sheets (4.9262 (8) Å).
For self-initiated
see: Cheng et al. (2006); Ericsson (2001). For of N-substituted maleimides, see: Yamada et al. (1968). For applications of similar compounds, see: Stang & White (2011); Sanchez et al. (2011); Keller et al. (2005). For the synthesis of the title compound, see: Yamada et al. (1961); Gramlich et al. (2010); Heath et al. (2008).Data collection: SMART (Bruker, 2000); cell
SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The asymmetric unit of the title compound with atom labelling scheme and thermal ellipsoids drawn at the 40% probability level. Intermolecular hydrogen bonds O—H···O are presented by dashed lines. | |
Fig. 2. Portion of six infinite two-dimensional corrugated sheets in (I) linked by hydrogen-bonds, viewed along the a axis. These six sheets can be dubbed in three pairs of hydrogen-bonded layers. |
C6H7NO3 | F(000) = 592.0 |
Mr = 141.13 | Dx = 1.424 Mg m−3 |
Monoclinic, P21/c | Melting point: 344 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 7.734 (4) Å | Cell parameters from 380 reflections |
b = 9.701 (5) Å | θ = 2.5–28.3° |
c = 17.673 (8) Å | µ = 0.12 mm−1 |
β = 96.660 (7)° | T = 293 K |
V = 1317.0 (11) Å3 | Block, colourless |
Z = 8 | 0.45 × 0.29 × 0.26 mm |
Bruker SMART CCD diffractometer | 3003 independent reflections |
Radiation source: fine-focus sealed tube | 1972 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.060 |
φ and ω scans | θmax = 28.4°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −8→10 |
Tmin = 0.962, Tmax = 0.976 | k = −11→12 |
7522 measured reflections | l = −23→23 |
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)] = 0.081 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.217 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.10 | w = 1/[σ2(Fo2) + (0.097P)2 + 0.420P] where P = (Fo2 + 2Fc2)/3 |
3003 reflections | (Δ/σ)max = 0.001 |
201 parameters | Δρmax = 0.38 e Å−3 |
8 restraints | Δρmin = −0.29 e Å−3 |
C6H7NO3 | V = 1317.0 (11) Å3 |
Mr = 141.13 | Z = 8 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.734 (4) Å | µ = 0.12 mm−1 |
b = 9.701 (5) Å | T = 293 K |
c = 17.673 (8) Å | 0.45 × 0.29 × 0.26 mm |
β = 96.660 (7)° |
Bruker SMART CCD diffractometer | 3003 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 1972 reflections with I > 2σ(I) |
Tmin = 0.962, Tmax = 0.976 | Rint = 0.060 |
7522 measured reflections |
R[F2 > 2σ(F2)] = 0.081 | 8 restraints |
wR(F2) = 0.217 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.10 | Δρmax = 0.38 e Å−3 |
3003 reflections | Δρmin = −0.29 e Å−3 |
201 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 | Occ. (<1) | |
O2A | 0.2520 (4) | 1.0076 (3) | 0.5604 (2) | 0.0911 (10) | |
O5A | 0.2601 (3) | 0.5693 (2) | 0.64576 (16) | 0.0653 (7) | |
O12A | 0.4289 (3) | 0.6222 (3) | 0.47672 (15) | 0.0617 (7) | |
H12A | 0.3228 (14) | 0.630 (4) | 0.475 (5) | 0.093* | 0.50 |
H12B | 0.1884 (13) | 0.594 (5) | 0.452 (5) | 0.093* | 0.50 |
O2B | 0.2505 (3) | 0.9305 (2) | 0.33843 (17) | 0.0709 (8) | |
O5B | 0.2400 (3) | 0.4751 (2) | 0.28146 (15) | 0.0622 (7) | |
O12B | 0.0831 (3) | 0.5827 (2) | 0.45141 (14) | 0.0529 (6) | |
H12C | 0.450 (9) | 0.561 (3) | 0.508 (2) | 0.079* | 0.50 |
H12D | 0.023 (5) | 0.548 (6) | 0.481 (4) | 0.079* | 0.50 |
N1A | 0.3035 (3) | 0.7840 (2) | 0.59889 (14) | 0.0440 (6) | |
N1B | 0.1968 (3) | 0.7013 (2) | 0.31464 (13) | 0.0369 (6) | |
C2A | 0.2026 (5) | 0.9003 (3) | 0.5835 (2) | 0.0544 (8) | |
C3A | 0.0255 (5) | 0.8636 (4) | 0.6022 (2) | 0.0607 (9) | |
H3A | −0.0708 | 0.9216 | 0.5973 | 0.073* | |
C4A | 0.0275 (4) | 0.7364 (4) | 0.62661 (18) | 0.0527 (8) | |
H4A | −0.0669 | 0.6888 | 0.6420 | 0.063* | |
C5A | 0.2058 (4) | 0.6808 (3) | 0.62565 (17) | 0.0435 (7) | |
C11A | 0.4858 (4) | 0.7719 (3) | 0.5876 (2) | 0.0510 (8) | |
H111 | 0.5380 | 0.6972 | 0.6189 | 0.061* | |
H112 | 0.5458 | 0.8564 | 0.6040 | 0.061* | |
C12A | 0.5090 (4) | 0.7447 (4) | 0.5057 (2) | 0.0583 (9) | |
H121 | 0.4612 | 0.8216 | 0.4751 | 0.070* | |
H122 | 0.6325 | 0.7398 | 0.5009 | 0.070* | |
C2B | 0.2981 (4) | 0.8183 (3) | 0.32075 (18) | 0.0436 (7) | |
C3B | 0.4715 (4) | 0.7761 (3) | 0.30062 (19) | 0.0483 (8) | |
H3B | 0.5671 | 0.8340 | 0.2997 | 0.058* | |
C4B | 0.4683 (4) | 0.6462 (3) | 0.28466 (18) | 0.0468 (8) | |
H4B | 0.5613 | 0.5957 | 0.2702 | 0.056* | |
C5B | 0.2936 (4) | 0.5904 (3) | 0.29288 (17) | 0.0412 (7) | |
C11B | 0.0143 (4) | 0.6925 (3) | 0.32856 (17) | 0.0432 (7) | |
H113 | −0.0359 | 0.6087 | 0.3055 | 0.052* | |
H114 | −0.0489 | 0.7700 | 0.3041 | 0.052* | |
C12B | −0.0084 (4) | 0.6927 (3) | 0.41195 (19) | 0.0491 (8) | |
H123 | 0.0332 | 0.7795 | 0.4343 | 0.059* | |
H124 | −0.1313 | 0.6850 | 0.4177 | 0.059* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O2A | 0.089 (2) | 0.0435 (16) | 0.144 (3) | 0.0012 (14) | 0.0289 (19) | 0.0214 (17) |
O5A | 0.0582 (15) | 0.0482 (14) | 0.0865 (19) | −0.0029 (11) | −0.0048 (13) | 0.0229 (13) |
O12A | 0.0487 (13) | 0.0734 (17) | 0.0628 (16) | 0.0004 (12) | 0.0055 (12) | −0.0066 (12) |
O2B | 0.0717 (17) | 0.0406 (14) | 0.105 (2) | 0.0016 (11) | 0.0321 (15) | −0.0125 (13) |
O5B | 0.0615 (15) | 0.0379 (13) | 0.0905 (19) | −0.0007 (10) | 0.0232 (13) | −0.0092 (12) |
O12B | 0.0448 (12) | 0.0588 (14) | 0.0561 (14) | −0.0039 (11) | 0.0105 (11) | 0.0157 (11) |
N1A | 0.0459 (14) | 0.0391 (14) | 0.0468 (14) | −0.0010 (11) | 0.0048 (11) | 0.0041 (11) |
N1B | 0.0362 (12) | 0.0353 (13) | 0.0407 (13) | 0.0040 (10) | 0.0109 (10) | 0.0037 (10) |
C2A | 0.066 (2) | 0.0370 (18) | 0.060 (2) | 0.0050 (15) | 0.0101 (17) | 0.0021 (15) |
C3A | 0.060 (2) | 0.053 (2) | 0.072 (2) | 0.0157 (16) | 0.0204 (18) | −0.0029 (18) |
C4A | 0.0535 (19) | 0.061 (2) | 0.0456 (18) | −0.0009 (16) | 0.0136 (15) | −0.0041 (15) |
C5A | 0.0464 (17) | 0.0445 (17) | 0.0388 (15) | −0.0010 (13) | 0.0011 (12) | 0.0060 (13) |
C11A | 0.0379 (16) | 0.0485 (18) | 0.065 (2) | −0.0061 (14) | 0.0005 (14) | −0.0005 (16) |
C12A | 0.0439 (18) | 0.062 (2) | 0.071 (2) | −0.0044 (16) | 0.0140 (16) | 0.0094 (18) |
C2B | 0.0481 (17) | 0.0371 (16) | 0.0468 (17) | 0.0009 (13) | 0.0109 (13) | 0.0052 (13) |
C3B | 0.0433 (17) | 0.0446 (18) | 0.0588 (19) | −0.0076 (13) | 0.0133 (14) | 0.0083 (15) |
C4B | 0.0428 (17) | 0.0435 (17) | 0.0567 (19) | 0.0110 (13) | 0.0170 (14) | 0.0131 (14) |
C5B | 0.0479 (17) | 0.0338 (16) | 0.0427 (16) | 0.0073 (12) | 0.0089 (13) | 0.0064 (12) |
C11B | 0.0368 (15) | 0.0454 (17) | 0.0484 (17) | 0.0037 (12) | 0.0092 (13) | 0.0045 (13) |
C12B | 0.0490 (18) | 0.0458 (18) | 0.0565 (19) | 0.0015 (14) | 0.0227 (15) | 0.0005 (15) |
O2A—C2A | 1.196 (4) | C3A—H3A | 0.9300 |
O5A—C5A | 1.199 (4) | C4A—C5A | 1.483 (4) |
O12A—C12A | 1.409 (4) | C4A—H4A | 0.9300 |
O12A—H12A | 0.821 (10) | C11A—C12A | 1.503 (5) |
O12A—H12C | 0.821 (10) | C11A—H111 | 0.9700 |
O2B—C2B | 1.202 (4) | C11A—H112 | 0.9700 |
O5B—C5B | 1.201 (4) | C12A—H121 | 0.9700 |
O12B—C12B | 1.418 (4) | C12A—H122 | 0.9700 |
O12B—H12B | 0.821 (10) | C2B—C3B | 1.484 (4) |
O12B—H12D | 0.817 (10) | C3B—C4B | 1.291 (4) |
N1A—C5A | 1.371 (4) | C3B—H3B | 0.9300 |
N1A—C2A | 1.381 (4) | C4B—C5B | 1.478 (4) |
N1A—C11A | 1.452 (4) | C4B—H4B | 0.9300 |
N1B—C2B | 1.376 (4) | C11B—C12B | 1.504 (4) |
N1B—C5B | 1.391 (4) | C11B—H113 | 0.9700 |
N1B—C11B | 1.463 (4) | C11B—H114 | 0.9700 |
C2A—C3A | 1.489 (5) | C12B—H123 | 0.9700 |
C3A—C4A | 1.307 (5) | C12B—H124 | 0.9700 |
C12A—O12A—H12A | 110 (2) | O12A—C12A—C11A | 113.7 (3) |
C12A—O12A—H12C | 109 (2) | O12A—C12A—H121 | 108.8 |
H12A—O12A—H12C | 102 (8) | C11A—C12A—H121 | 108.8 |
C12B—O12B—H12B | 110 (2) | O12A—C12A—H122 | 108.8 |
C12B—O12B—H12D | 110 (2) | C11A—C12A—H122 | 108.8 |
H12B—O12B—H12D | 133 (6) | H121—C12A—H122 | 107.7 |
C5A—N1A—C2A | 110.1 (3) | O2B—C2B—N1B | 125.3 (3) |
C5A—N1A—C11A | 124.8 (3) | O2B—C2B—C3B | 128.6 (3) |
C2A—N1A—C11A | 125.1 (3) | N1B—C2B—C3B | 106.0 (2) |
C2B—N1B—C5B | 109.9 (2) | C4B—C3B—C2B | 109.1 (3) |
C2B—N1B—C11B | 125.9 (2) | C4B—C3B—H3B | 125.5 |
C5B—N1B—C11B | 124.2 (2) | C2B—C3B—H3B | 125.5 |
O2A—C2A—N1A | 125.6 (3) | C3B—C4B—C5B | 109.3 (3) |
O2A—C2A—C3A | 128.5 (3) | C3B—C4B—H4B | 125.3 |
N1A—C2A—C3A | 105.9 (3) | C5B—C4B—H4B | 125.3 |
C4A—C3A—C2A | 108.9 (3) | O5B—C5B—N1B | 125.5 (3) |
C4A—C3A—H3A | 125.6 | O5B—C5B—C4B | 128.7 (3) |
C2A—C3A—H3A | 125.6 | N1B—C5B—C4B | 105.7 (2) |
C3A—C4A—C5A | 108.4 (3) | N1B—C11B—C12B | 112.9 (3) |
C3A—C4A—H4A | 125.8 | N1B—C11B—H113 | 109.0 |
C5A—C4A—H4A | 125.8 | C12B—C11B—H113 | 109.0 |
O5A—C5A—N1A | 125.0 (3) | N1B—C11B—H114 | 109.0 |
O5A—C5A—C4A | 128.2 (3) | C12B—C11B—H114 | 109.0 |
N1A—C5A—C4A | 106.8 (3) | H113—C11B—H114 | 107.8 |
N1A—C11A—C12A | 111.9 (3) | O12B—C12B—C11B | 111.9 (2) |
N1A—C11A—H111 | 109.2 | O12B—C12B—H123 | 109.2 |
C12A—C11A—H111 | 109.2 | C11B—C12B—H123 | 109.2 |
N1A—C11A—H112 | 109.2 | O12B—C12B—H124 | 109.2 |
C12A—C11A—H112 | 109.2 | C11B—C12B—H124 | 109.2 |
H111—C11A—H112 | 107.9 | H123—C12B—H124 | 107.9 |
D—H···A | D—H | H···A | D···A | D—H···A |
O12A—H12A···O12B | 0.82 (1) | 1.91 (1) | 2.688 (3) | 158 (3) |
O12B—H12B···O12A | 0.82 (1) | 1.88 (2) | 2.688 (3) | 168 (8) |
O12A—H12C···O12Ai | 0.82 (1) | 2.01 (4) | 2.702 (5) | 142 (7) |
O12B—H12D···O12Bii | 0.82 (1) | 1.98 (2) | 2.773 (4) | 163 (5) |
C4B—H4B···O5Ai | 0.93 | 2.49 | 3.114 (4) | 125 |
C3A—H3A···O2Biii | 0.93 | 2.38 | 3.188 (4) | 146 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y+1, −z+1; (iii) −x, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C6H7NO3 |
Mr | 141.13 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 7.734 (4), 9.701 (5), 17.673 (8) |
β (°) | 96.660 (7) |
V (Å3) | 1317.0 (11) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.12 |
Crystal size (mm) | 0.45 × 0.29 × 0.26 |
Data collection | |
Diffractometer | Bruker SMART CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.962, 0.976 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7522, 3003, 1972 |
Rint | 0.060 |
(sin θ/λ)max (Å−1) | 0.669 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.081, 0.217, 1.10 |
No. of reflections | 3003 |
No. of parameters | 201 |
No. of restraints | 8 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.38, −0.29 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXTL (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O12A—H12A···O12B | 0.821 (10) | 1.908 (13) | 2.688 (3) | 158 (3) |
O12B—H12B···O12A | 0.821 (10) | 1.88 (2) | 2.688 (3) | 168 (8) |
O12A—H12C···O12Ai | 0.821 (10) | 2.01 (4) | 2.702 (5) | 142 (7) |
O12B—H12D···O12Bii | 0.817 (10) | 1.980 (16) | 2.773 (4) | 163 (5) |
C4B—H4B···O5Ai | 0.93 | 2.49 | 3.114 (4) | 124.7 |
C3A—H3A···O2Biii | 0.93 | 2.38 | 3.188 (4) | 145.9 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y+1, −z+1; (iii) −x, −y+2, −z+1. |
Acknowledgements
This work was supported by the Science & Technology Development Project of Shandong Province in China (No. 2011GGB01164), the National Natural Science Foundation of China (NSFC, No. 21103100) and the Natural Science Foundation of Shandong Province in China (No. ZR2009BM040).
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Maleimides are a class of reactive "synthons" having a polymerizable double bond. They are particularly useful in manufacturing oligomers capable of self-initiated photopolymerization (Cheng et al., 2006; Ericsson, 2001). The title compound, N-2-hydroxyethylmaleimide, first prepared in 1961 (Yamada et al., 1961), is a well-known maleimide that has been intensively studied during last years (Stang & White, 2011; Sanchez et al., 2011; Keller et al., 2005). However its crystal structure has not been determined. In this work, the crystal structure of the title compound is reported, and its molecular packing mode is discussed.
As shown in Fig. 1, the asymmetric unit of the title compound contains two molecules (A and B) related by the non-crystallographic two-fold pseudo-axis. The molecules are joined in the (AABB)n manner by O—H···O hydrogen bonds between their hydroxy groups, thus forming the C(2) chains stretched along the a-axis direction. The neighboring molecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hydroxy hydrogen atoms are disordered other two sets of sites with half occupancies, thus the fragments O—H···O and O···H—O are superimposed. The molecules are further linked by intermolecular C—H···O interactions, which can be considered as weak hydrogen bonds.
Instead of helices, hydrogen bonds make (I) pack into zigzag-type pleated sheets stretched along (0 0 1) planes (Fig. 2). Adjacent sheets are arranged in an antiparallel manner, yielding an ABAB layer sequence. Either O—H···O and C—H···O interactions or no such interactions occur between adjacent sheets. As can be seen, the hydrogen-bonded sheets are rather closely spaced in the lattice (3.9103 (9) Å) than no-hydrogen-bonded sheets (4.9262 (8) Å).