Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807026190/bt2383sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807026190/bt2383Isup2.hkl |
CCDC reference: 654895
15-Crown-5, which is a liquid at room temperature, was obtained from Aldrich and used as received.
A sample of 15-crown-5 was drawn into a glass capillary and mounted on the diffractometer with the low-temperature device set to 220 K. The compound supercooled at first, but solidified into a glassy mass on swabbing with liquid nitrogen. The glass was annealed into a polycrystalline mass by scanning the capillary with an IR laser (OHCD) for 4 h. The power set at half that needed to melt the sample, with the low temperature device set to 230 K. A crystal was subsequently grown over the course of 1 h by Boese's laser-assisted crystal growth method (Boese & Nussbaumer, 1994).
The crystal grown was larger than the beam-size (0.3 mm). This often happens with low-melting compounds, as there is little experimental control over the length of a crystal grown in situ in a capillary. Görbitz (1999) has shown that use of a large crystal does not degrade data quality.
A data set was collected at 220 K, where the unit-cell dimensions were a = 8.8532 (5), c = 30.172 (2) Å. The crystal was then cooled to 120 K at a rate of 360 K h-1 for the structure determination reported here.
Following data collection a multiscan absorption correction was applied (SADABS, Sheldrick, 2007), though the range of transmission was more extreme than would have been calculated on crystal dimensions. SADABS corrects for all systematic errors that lead to disparities in the intensities of symmetry-equivalent data. These may include absorption by the mount, crystal decay, changes in the volume of the crystal illuminated, etc. Here the glass capillary is an obvious extra source of absorption.
One reflection (011) appears to have been obscured by the beam-stop.
Though the space group is P41, absolute scattering effects are very slight and data were merged in point group 4/m. The abolute structure has not been established in this study.
H-atoms were placed in calculated positions with a CH bond distance of 0.99 Å and Uiso(H) = 1.2Ueq(C).
15-crown-5 (I) is a crown ether which is often used as a ligand in coordination chemistry. It crystallizes in space group P41 with two molecules in the asymmetric unit. The conformations of the two molecules are different (Figs. 1 and 2). Hill & Feller (2000) studied conformations of I using ab initio methods, identifying 16 low-energy conformers, though none of these appear to match either of those observed here. Raithby et al. (1997) analysed conformers of I in the Cambridge Database (Allen, 2002), and though regions of the uniangular conformers identified in that study resemble the conformations observed here the agreement is not complete. Three CH···O contacts in the range 2.5–2.6 Å are formed between molecules, with a forth intramolecular interaction formed between H84 and O42 (2.51 Å). Hill & Feller (2000) commented that accurate prediction of low-lying conformations in floppy molecules is a challenging task, and the presence of intermolecular interactions, though weak, could well alter computational energy rankings derived for isolated molecules.
Hill & Feller (2000) studied conformations of the title compound using ab initio methods. Raithby et al. (1997) analysed conformers of the title compound in the Cambridge Structural Database (Allen, 2002).
For related literature, see: Blessing (1987); Boese & Nussbaumer (1994); Görbitz (1999).
Data collection: SMART (Siemens, 1993); cell refinement: SAINT; data reduction: SAINT (Siemens, 1995); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: XP (Sheldrick, 1997); software used to prepare material for publication: CRYSTALS.
C10H20O5 | Dx = 1.258 Mg m−3 |
Mr = 220.27 | Mo Kα radiation, λ = 0.71073 Å |
Tetragonal, P41 | Cell parameters from 5144 reflections |
Hall symbol: P 4w | θ = 2–21° |
a = 8.7954 (1) Å | µ = 0.10 mm−1 |
c = 30.0676 (10) Å | T = 120 K |
V = 2326.00 (9) Å3 | Cylinder, colourless |
Z = 8 | 1.00 × 0.30 × 0.30 mm |
F(000) = 960 |
Bruker SMART APEX CCD area-detector diffractometer | 1996 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.052 |
ω scans | θmax = 26.4°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | h = −10→10 |
Tmin = 0.73, Tmax = 0.97 | k = −10→10 |
24253 measured reflections | l = −37→37 |
2414 independent reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.043 | H-atom parameters not refined |
wR(F2) = 0.084 | Method, part 1, Chebychev polynomial, [Watkin, D. (1994). Acta Cryst. A50,
411–437.
Prince, E. (2004). Mathematical Techniques in Crystallography and
Materials Science, 3rd ed., p. 81. New York: Springer-Verlag]
[weight] = 1.0/[A0*T0(x) + A1*T1(x) ··· + An-1]*Tn-1(x)]
where Ai are the Chebychev coefficients listed below and x = F /Fmax Method = Robust Weighting (Prince, 2004) W = [weight] * [1-(deltaF/6*sigmaF)2]2 Ai are: 158. 236. 145. 57.8 14.6 |
S = 0.95 | (Δ/σ)max = 0.005 |
2414 reflections | Δρmax = 0.20 e Å−3 |
271 parameters | Δρmin = −0.16 e Å−3 |
1 restraint |
C10H20O5 | Z = 8 |
Mr = 220.27 | Mo Kα radiation |
Tetragonal, P41 | µ = 0.10 mm−1 |
a = 8.7954 (1) Å | T = 120 K |
c = 30.0676 (10) Å | 1.00 × 0.30 × 0.30 mm |
V = 2326.00 (9) Å3 |
Bruker SMART APEX CCD area-detector diffractometer | 2414 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | 1996 reflections with I > 2σ(I) |
Tmin = 0.73, Tmax = 0.97 | Rint = 0.052 |
24253 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | 1 restraint |
wR(F2) = 0.084 | H-atom parameters not refined |
S = 0.95 | Δρmax = 0.20 e Å−3 |
2414 reflections | Δρmin = −0.16 e Å−3 |
271 parameters |
x | y | z | Uiso*/Ueq | ||
O11 | 0.8585 (3) | 0.1125 (3) | 0.65682 (10) | 0.0359 | |
C21 | 0.7737 (4) | 0.2441 (4) | 0.64577 (13) | 0.0315 | |
C31 | 0.6206 (4) | 0.2220 (4) | 0.66747 (13) | 0.0313 | |
O41 | 0.5287 (3) | 0.3540 (3) | 0.66244 (10) | 0.0332 | |
C51 | 0.3923 (4) | 0.3337 (4) | 0.63720 (13) | 0.0345 | |
C61 | 0.4052 (4) | 0.3894 (4) | 0.59059 (14) | 0.0356 | |
O71 | 0.5012 (3) | 0.2899 (3) | 0.56624 (9) | 0.0333 | |
C81 | 0.5226 (5) | 0.3386 (4) | 0.52185 (13) | 0.0368 | |
C91 | 0.6388 (5) | 0.2377 (4) | 0.50020 (13) | 0.0373 | |
O101 | 0.7829 (3) | 0.2746 (3) | 0.51751 (10) | 0.0370 | |
C111 | 0.8965 (5) | 0.1651 (4) | 0.50746 (14) | 0.0371 | |
C121 | 1.0431 (4) | 0.2156 (4) | 0.52836 (15) | 0.0387 | |
O131 | 1.0336 (3) | 0.2323 (3) | 0.57526 (11) | 0.0340 | |
C141 | 1.0566 (4) | 0.0962 (4) | 0.59932 (15) | 0.0363 | |
C151 | 1.0171 (4) | 0.1225 (4) | 0.64738 (14) | 0.0349 | |
O12 | 0.6696 (3) | 0.8020 (3) | 0.39743 (9) | 0.0293 | |
C22 | 0.7388 (4) | 0.7345 (4) | 0.43517 (12) | 0.0286 | |
C32 | 0.7435 (4) | 0.5657 (4) | 0.42843 (12) | 0.0293 | |
O42 | 0.8383 (3) | 0.5346 (3) | 0.39138 (9) | 0.0298 | |
C52 | 0.8145 (4) | 0.3873 (4) | 0.37354 (14) | 0.0316 | |
C62 | 0.8974 (4) | 0.3728 (4) | 0.32991 (14) | 0.0341 | |
O72 | 0.8270 (3) | 0.4512 (3) | 0.29374 (10) | 0.0378 | |
C82 | 0.8440 (4) | 0.6116 (4) | 0.29590 (13) | 0.0345 | |
C92 | 0.8089 (5) | 0.6733 (5) | 0.25020 (14) | 0.0427 | |
O102 | 0.8080 (3) | 0.8351 (3) | 0.25098 (10) | 0.0396 | |
C112 | 0.6627 (4) | 0.8981 (5) | 0.25936 (14) | 0.0377 | |
C122 | 0.6797 (4) | 1.0472 (4) | 0.28319 (13) | 0.0332 | |
O132 | 0.7249 (3) | 1.0262 (3) | 0.32812 (10) | 0.0303 | |
C142 | 0.6008 (4) | 1.0242 (4) | 0.35831 (13) | 0.0306 | |
C152 | 0.6532 (4) | 0.9617 (4) | 0.40185 (13) | 0.0302 | |
H21 | 0.8243 | 0.3363 | 0.6577 | 0.0383* | |
H22 | 0.7629 | 0.2531 | 0.6132 | 0.0383* | |
H31 | 0.6353 | 0.2012 | 0.6996 | 0.0374* | |
H32 | 0.5687 | 0.1346 | 0.6534 | 0.0374* | |
H51 | 0.3095 | 0.3900 | 0.6524 | 0.0414* | |
H52 | 0.3678 | 0.2239 | 0.6369 | 0.0414* | |
H61 | 0.4490 | 0.4931 | 0.5904 | 0.0424* | |
H62 | 0.3032 | 0.3915 | 0.5767 | 0.0424* | |
H81 | 0.5586 | 0.4452 | 0.5217 | 0.0437* | |
H82 | 0.4250 | 0.3316 | 0.5056 | 0.0437* | |
H91 | 0.6152 | 0.1298 | 0.5067 | 0.0445* | |
H92 | 0.6381 | 0.2542 | 0.4677 | 0.0445* | |
H111 | 0.8668 | 0.0650 | 0.5197 | 0.0441* | |
H112 | 0.9095 | 0.1575 | 0.4749 | 0.0441* | |
H121 | 1.1227 | 0.1391 | 0.5216 | 0.0477* | |
H122 | 1.0728 | 0.3147 | 0.5153 | 0.0477* | |
H141 | 1.1644 | 0.0648 | 0.5969 | 0.0441* | |
H142 | 0.9907 | 0.0152 | 0.5870 | 0.0441* | |
H151 | 1.0707 | 0.0453 | 0.6656 | 0.0422* | |
H152 | 1.0526 | 0.2252 | 0.6559 | 0.0422* | |
H23 | 0.8433 | 0.7743 | 0.4389 | 0.0338* | |
H24 | 0.6785 | 0.7587 | 0.4623 | 0.0338* | |
H33 | 0.7855 | 0.5157 | 0.4555 | 0.0359* | |
H34 | 0.6397 | 0.5267 | 0.4229 | 0.0359* | |
H53 | 0.8532 | 0.3097 | 0.3947 | 0.0389* | |
H54 | 0.7043 | 0.3706 | 0.3687 | 0.0389* | |
H63 | 1.0012 | 0.4142 | 0.3340 | 0.0411* | |
H64 | 0.9037 | 0.2636 | 0.3222 | 0.0411* | |
H83 | 0.9494 | 0.6378 | 0.3046 | 0.0420* | |
H84 | 0.7723 | 0.6544 | 0.3181 | 0.0420* | |
H93 | 0.8872 | 0.6375 | 0.2291 | 0.0510* | |
H94 | 0.7078 | 0.6360 | 0.2407 | 0.0510* | |
H113 | 0.6029 | 0.8274 | 0.2781 | 0.0460* | |
H114 | 0.6093 | 0.9149 | 0.2309 | 0.0460* | |
H123 | 0.7572 | 1.1091 | 0.2678 | 0.0407* | |
H124 | 0.5808 | 1.1012 | 0.2827 | 0.0407* | |
H143 | 0.5620 | 1.1292 | 0.3627 | 0.0381* | |
H144 | 0.5182 | 0.9596 | 0.3463 | 0.0381* | |
H153 | 0.7526 | 1.0074 | 0.4100 | 0.0368* | |
H154 | 0.5780 | 0.9850 | 0.4254 | 0.0368* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O11 | 0.0300 (14) | 0.0283 (13) | 0.0495 (17) | 0.0026 (11) | 0.0000 (12) | 0.0089 (12) |
C21 | 0.0331 (19) | 0.0276 (18) | 0.034 (2) | 0.0014 (15) | −0.0017 (16) | 0.0081 (16) |
C31 | 0.034 (2) | 0.032 (2) | 0.0275 (19) | 0.0016 (15) | 0.0009 (15) | 0.0021 (15) |
O41 | 0.0312 (14) | 0.0290 (14) | 0.0395 (15) | 0.0036 (11) | −0.0031 (12) | −0.0071 (11) |
C51 | 0.0281 (19) | 0.036 (2) | 0.039 (2) | 0.0010 (15) | 0.0017 (17) | −0.0070 (17) |
C61 | 0.0284 (19) | 0.0310 (19) | 0.047 (2) | 0.0067 (15) | −0.0006 (17) | −0.0013 (17) |
O71 | 0.0343 (14) | 0.0338 (13) | 0.0317 (15) | 0.0054 (11) | −0.0007 (11) | 0.0006 (11) |
C81 | 0.040 (2) | 0.041 (2) | 0.029 (2) | 0.0003 (17) | −0.0054 (17) | 0.0026 (17) |
C91 | 0.051 (2) | 0.034 (2) | 0.0268 (19) | −0.0097 (18) | −0.0036 (18) | 0.0001 (16) |
O101 | 0.0411 (16) | 0.0331 (15) | 0.0369 (15) | −0.0011 (12) | 0.0060 (12) | −0.0056 (12) |
C111 | 0.049 (2) | 0.031 (2) | 0.032 (2) | −0.0005 (17) | 0.0170 (18) | −0.0028 (16) |
C121 | 0.035 (2) | 0.037 (2) | 0.044 (2) | 0.0009 (17) | 0.0172 (18) | −0.0007 (18) |
O131 | 0.0335 (15) | 0.0270 (13) | 0.0416 (15) | −0.0028 (11) | 0.0078 (12) | −0.0040 (12) |
C141 | 0.0276 (19) | 0.0260 (19) | 0.055 (3) | 0.0007 (15) | 0.0000 (17) | −0.0028 (18) |
C151 | 0.0246 (18) | 0.036 (2) | 0.044 (2) | 0.0012 (15) | −0.0046 (17) | 0.0054 (18) |
O12 | 0.0377 (14) | 0.0237 (12) | 0.0264 (12) | −0.0021 (10) | −0.0039 (11) | 0.0010 (10) |
C22 | 0.0276 (18) | 0.035 (2) | 0.0231 (18) | −0.0006 (15) | 0.0007 (14) | 0.0031 (15) |
C32 | 0.0279 (18) | 0.0331 (19) | 0.0270 (18) | −0.0012 (15) | −0.0004 (15) | 0.0068 (15) |
O42 | 0.0324 (14) | 0.0278 (13) | 0.0291 (14) | −0.0025 (11) | 0.0047 (11) | −0.0004 (10) |
C52 | 0.0315 (19) | 0.0218 (17) | 0.042 (2) | −0.0010 (15) | −0.0030 (16) | 0.0050 (15) |
C62 | 0.038 (2) | 0.0271 (19) | 0.038 (2) | −0.0002 (16) | −0.0059 (17) | −0.0051 (16) |
O72 | 0.0486 (16) | 0.0257 (13) | 0.0392 (16) | −0.0030 (12) | −0.0123 (13) | −0.0065 (12) |
C82 | 0.045 (2) | 0.0305 (19) | 0.028 (2) | −0.0049 (16) | −0.0020 (17) | −0.0052 (17) |
C92 | 0.057 (3) | 0.040 (2) | 0.031 (2) | 0.0015 (19) | 0.001 (2) | −0.0050 (18) |
O102 | 0.0442 (16) | 0.0380 (16) | 0.0367 (15) | 0.0009 (12) | 0.0084 (13) | 0.0070 (12) |
C112 | 0.034 (2) | 0.045 (2) | 0.034 (2) | −0.0028 (17) | −0.0038 (17) | 0.0067 (18) |
C122 | 0.033 (2) | 0.032 (2) | 0.035 (2) | −0.0012 (16) | −0.0039 (16) | 0.0074 (16) |
O132 | 0.0247 (12) | 0.0374 (14) | 0.0289 (13) | 0.0004 (10) | −0.0019 (11) | 0.0068 (11) |
C142 | 0.0242 (18) | 0.0271 (18) | 0.040 (2) | −0.0018 (14) | 0.0000 (16) | 0.0002 (16) |
C152 | 0.0273 (18) | 0.0282 (18) | 0.035 (2) | −0.0007 (15) | 0.0042 (15) | −0.0045 (15) |
O11—C21 | 1.416 (4) | O12—C22 | 1.418 (4) |
O11—C151 | 1.427 (4) | O12—C152 | 1.419 (4) |
C21—C31 | 1.509 (5) | C22—C32 | 1.499 (5) |
C21—H21 | 0.992 | C22—H23 | 0.990 |
C21—H22 | 0.987 | C22—H24 | 0.995 |
C31—O41 | 1.423 (4) | C32—O42 | 1.418 (4) |
C31—H31 | 0.991 | C32—H33 | 0.995 |
C31—H32 | 0.989 | C32—H34 | 0.990 |
O41—C51 | 1.430 (4) | O42—C52 | 1.418 (4) |
C51—C61 | 1.489 (5) | C52—C62 | 1.507 (5) |
C51—H51 | 0.992 | C52—H53 | 0.992 |
C51—H52 | 0.990 | C52—H54 | 0.991 |
C61—O71 | 1.420 (4) | C62—O72 | 1.429 (5) |
C61—H61 | 0.991 | C62—H63 | 0.990 |
C61—H62 | 0.990 | C62—H64 | 0.989 |
O71—C81 | 1.415 (4) | O72—C82 | 1.420 (4) |
C81—C91 | 1.502 (6) | C82—C92 | 1.509 (6) |
C81—H81 | 0.989 | C82—H83 | 0.990 |
C81—H82 | 0.989 | C82—H84 | 0.992 |
C91—O101 | 1.409 (5) | C92—O102 | 1.424 (5) |
C91—H91 | 0.991 | C92—H93 | 0.988 |
C91—H92 | 0.987 | C92—H94 | 0.990 |
O101—C111 | 1.420 (5) | O102—C112 | 1.416 (5) |
C111—C121 | 1.502 (6) | C112—C122 | 1.502 (6) |
C111—H111 | 0.989 | C112—H113 | 0.990 |
C111—H112 | 0.988 | C112—H114 | 0.988 |
C121—O131 | 1.420 (5) | C122—O132 | 1.420 (4) |
C121—H121 | 0.992 | C122—H123 | 0.988 |
C121—H122 | 0.991 | C122—H124 | 0.991 |
O131—C141 | 1.413 (5) | O132—C142 | 1.420 (4) |
C141—C151 | 1.504 (6) | C142—C152 | 1.493 (5) |
C141—H141 | 0.990 | C142—H143 | 0.992 |
C141—H142 | 0.990 | C142—H144 | 0.990 |
C151—H151 | 0.992 | C152—H153 | 0.993 |
C151—H152 | 0.989 | C152—H154 | 0.990 |
C21—O11—C151 | 114.7 (3) | C22—O12—C152 | 112.5 (3) |
O11—C21—C31 | 105.3 (3) | O12—C22—C32 | 108.6 (3) |
O11—C21—H21 | 110.3 | O12—C22—H23 | 109.9 |
C31—C21—H21 | 110.5 | C32—C22—H23 | 109.9 |
O11—C21—H22 | 110.4 | O12—C22—H24 | 109.7 |
C31—C21—H22 | 110.7 | C32—C22—H24 | 109.7 |
H21—C21—H22 | 109.5 | H23—C22—H24 | 109.1 |
C21—C31—O41 | 110.8 (3) | C22—C32—O42 | 108.3 (3) |
C21—C31—H31 | 109.2 | C22—C32—H33 | 109.7 |
O41—C31—H31 | 109.2 | O42—C32—H33 | 109.8 |
C21—C31—H32 | 109.1 | C22—C32—H34 | 109.9 |
O41—C31—H32 | 109.0 | O42—C32—H34 | 110.1 |
H31—C31—H32 | 109.4 | H33—C32—H34 | 109.1 |
C31—O41—C51 | 115.5 (3) | C32—O42—C52 | 112.7 (3) |
O41—C51—C61 | 113.3 (3) | O42—C52—C62 | 109.6 (3) |
O41—C51—H51 | 108.0 | O42—C52—H53 | 109.6 |
C61—C51—H51 | 109.0 | C62—C52—H53 | 109.5 |
O41—C51—H52 | 108.1 | O42—C52—H54 | 109.6 |
C61—C51—H52 | 109.2 | C62—C52—H54 | 109.4 |
H51—C51—H52 | 109.3 | H53—C52—H54 | 109.2 |
C51—C61—O71 | 109.1 (3) | C52—C62—O72 | 114.3 (3) |
C51—C61—H61 | 109.8 | C52—C62—H63 | 107.9 |
O71—C61—H61 | 109.4 | O72—C62—H63 | 108.4 |
C51—C61—H62 | 109.6 | C52—C62—H64 | 108.2 |
O71—C61—H62 | 109.4 | O72—C62—H64 | 108.4 |
H61—C61—H62 | 109.4 | H63—C62—H64 | 109.5 |
C61—O71—C81 | 112.3 (3) | C62—O72—C82 | 113.5 (3) |
O71—C81—C91 | 108.7 (3) | O72—C82—C92 | 107.1 (3) |
O71—C81—H81 | 109.4 | O72—C82—H83 | 110.0 |
C91—C81—H81 | 109.9 | C92—C82—H83 | 110.3 |
O71—C81—H82 | 109.3 | O72—C82—H84 | 109.9 |
C91—C81—H82 | 109.9 | C92—C82—H84 | 110.3 |
H81—C81—H82 | 109.6 | H83—C82—H84 | 109.3 |
C81—C91—O101 | 108.4 (3) | C82—C92—O102 | 110.2 (3) |
C81—C91—H91 | 109.8 | C82—C92—H93 | 109.2 |
O101—C91—H91 | 109.6 | O102—C92—H93 | 109.4 |
C81—C91—H92 | 109.7 | C82—C92—H94 | 109.1 |
O101—C91—H92 | 109.7 | O102—C92—H94 | 109.3 |
H91—C91—H92 | 109.6 | H93—C92—H94 | 109.6 |
C91—O101—C111 | 113.5 (3) | C92—O102—C112 | 113.5 (3) |
O101—C111—C121 | 108.3 (3) | O102—C112—C122 | 109.7 (3) |
O101—C111—H111 | 109.8 | O102—C112—H113 | 109.6 |
C121—C111—H111 | 109.5 | C122—C112—H113 | 109.2 |
O101—C111—H112 | 109.8 | O102—C112—H114 | 109.5 |
C121—C111—H112 | 109.6 | C122—C112—H114 | 109.3 |
H111—C111—H112 | 109.8 | H113—C112—H114 | 109.6 |
C111—C121—O131 | 113.3 (3) | C112—C122—O132 | 111.6 (3) |
C111—C121—H121 | 108.6 | C112—C122—H123 | 109.0 |
O131—C121—H121 | 108.3 | O132—C122—H123 | 109.0 |
C111—C121—H122 | 108.8 | C112—C122—H124 | 108.9 |
O131—C121—H122 | 108.5 | O132—C122—H124 | 108.8 |
H121—C121—H122 | 109.3 | H123—C122—H124 | 109.5 |
C121—O131—C141 | 114.4 (3) | C122—O132—C142 | 113.2 (3) |
O131—C141—C151 | 109.2 (3) | O132—C142—C152 | 109.1 (3) |
O131—C141—H141 | 109.6 | O132—C142—H143 | 109.7 |
C151—C141—H141 | 109.5 | C152—C142—H143 | 109.5 |
O131—C141—H142 | 109.5 | O132—C142—H144 | 109.8 |
C151—C141—H142 | 109.6 | C152—C142—H144 | 109.5 |
H141—C141—H142 | 109.4 | H143—C142—H144 | 109.3 |
C141—C151—O11 | 114.0 (3) | C142—C152—O12 | 108.3 (3) |
C141—C151—H151 | 108.4 | C142—C152—H153 | 109.8 |
O11—C151—H151 | 108.2 | O12—C152—H153 | 109.5 |
C141—C151—H152 | 108.5 | C142—C152—H154 | 110.1 |
O11—C151—H152 | 108.2 | O12—C152—H154 | 109.8 |
H151—C151—H152 | 109.4 | H153—C152—H154 | 109.3 |
C151—O11—C21—C31 | −167.9 (3) | C152—O12—C22—C32 | 177.0 (3) |
C31—O41—C51—C61 | −100.8 (4) | C32—O42—C52—C62 | 169.9 (3) |
C111—O101—C91—C81 | 166.4 (3) | C112—O102—C92—C82 | −91.7 (4) |
C121—O131—C141—C151 | −170.2 (3) | C122—O132—C142—C152 | 165.2 (3) |
O71—C81—C91—O101 | −73.1 (4) | O72—C82—C92—O102 | 173.9 (3) |
C21—O11—C151—C141 | −79.7 (4) | C22—O12—C152—C142 | 171.9 (3) |
C81—O71—C61—C51 | −178.1 (3) | C82—O72—C62—C52 | 73.5 (4) |
C91—O101—C111—C121 | −178.9 (3) | C92—O102—C112—C122 | 149.8 (3) |
O11—C21—C31—O41 | 174.4 (3) | O12—C22—C32—O42 | 64.0 (3) |
O101—C111—C121—O131 | 59.1 (4) | O102—C112—C122—O132 | −72.8 (4) |
C51—O41—C31—C21 | 116.9 (3) | C52—O42—C32—C22 | −161.6 (3) |
C61—O71—C81—C91 | 173.6 (3) | C62—O72—C82—C92 | 162.9 (3) |
C141—O131—C121—C111 | 84.8 (4) | C142—O132—C122—C112 | −94.9 (3) |
O41—C51—C61—O71 | 71.4 (4) | O42—C52—C62—O72 | −74.6 (4) |
O131—C141—C151—O11 | 82.0 (4) | O132—C142—C152—O12 | −75.2 (3) |
Experimental details
Crystal data | |
Chemical formula | C10H20O5 |
Mr | 220.27 |
Crystal system, space group | Tetragonal, P41 |
Temperature (K) | 120 |
a, c (Å) | 8.7954 (1), 30.0676 (10) |
V (Å3) | 2326.00 (9) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 1.00 × 0.30 × 0.30 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2007) |
Tmin, Tmax | 0.73, 0.97 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 24253, 2414, 1996 |
Rint | 0.052 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.084, 0.95 |
No. of reflections | 2414 |
No. of parameters | 271 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters not refined |
Δρmax, Δρmin (e Å−3) | 0.20, −0.16 |
Computer programs: SMART (Siemens, 1993), SAINT (Siemens, 1995), SIR92 (Altomare et al., 1994), CRYSTALS (Betteridge et al., 2003), XP (Sheldrick, 1997), CRYSTALS.
15-crown-5 (I) is a crown ether which is often used as a ligand in coordination chemistry. It crystallizes in space group P41 with two molecules in the asymmetric unit. The conformations of the two molecules are different (Figs. 1 and 2). Hill & Feller (2000) studied conformations of I using ab initio methods, identifying 16 low-energy conformers, though none of these appear to match either of those observed here. Raithby et al. (1997) analysed conformers of I in the Cambridge Database (Allen, 2002), and though regions of the uniangular conformers identified in that study resemble the conformations observed here the agreement is not complete. Three CH···O contacts in the range 2.5–2.6 Å are formed between molecules, with a forth intramolecular interaction formed between H84 and O42 (2.51 Å). Hill & Feller (2000) commented that accurate prediction of low-lying conformations in floppy molecules is a challenging task, and the presence of intermolecular interactions, though weak, could well alter computational energy rankings derived for isolated molecules.