organic compounds
1,3-Bis(ethoxymethyl)-1H-benzimidazole-2(3H)-thione
aDepartamento de Química, Universidad Nacional de Colombia, Bogotá, AA 14490, Colombia, and bInstitute of Physics, Na Slovance 2, 182 21 Praha 8, Czech Republic
*Correspondence e-mail: ariverau@unal.edu.co
In the structure of the title compound, C13H18N2O2S, molecules are linked together by intermolecular C—H⋯S interactions into one-dimensional extended chains along the a axis. The crystal packing is further influenced by weak C—H⋯O interactions.
Related literature
For related structures, see: Odabaşoğlu et al. (2007). For applications and uses of benzimidazole-2-thiones, see: Zhang et al. (2001, 2007); Monforte et al. (2008); Mazloum et al. (2000); Perrin & Pagetti (1998). For chemical background on the synthesis of the title compound, see: Wang & Liu (1996, 2007); Rivera & Maldonado (2006); Rivera et al. (2008).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED; program(s) used to solve structure: SIR2002 (Burla et al., 2003); program(s) used to refine structure: JANA2006 (Petříček et al., 2006); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: JANA2006.
Supporting information
https://doi.org/10.1107/S1600536810013036/bt5233sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810013036/bt5233Isup2.hkl
A mixture of CS2 (0,95 mmol) and DMDBTA (0,95 mmol) in ethanol (30 ml) was stirred at room temperature for 72 hours. After completion of reaction as monitored by TLC the solvent was distilled off in vacuo. The crude residue was purified by
over silica gel (60-120 mesh), using benzene:ethyl acetate mixture (80:20) as to give the title compound. A suitable single crystal (m.p. 377-379 K) of the product was formed by slow evaporation of an acetone solution at room temperature.The NMR spectra were acquired at room temperature on a Bruker AMX 400 Advanced spectrometer. 1H NMR (δ, 399.9 MHz, CDCl3) δ: 1.18 (6H, t, J=6.7 Hz –CH3), 3.64 (4H, q, J= 6.7 Hz, O—CH2-CH3) 5.82 (4H, s, N—CH2—O-), 7.27 (2H, m). 13C NMR (100 MHz, CDCl3) δ: 15.0, 64.9, 74.3, 110.1, 123.7, 131.7, 171.8. MS (ESI): [M+H]+ 267.
All hydrogen atoms were discernible in difference Fourier maps and could be refined to reasonable geometry. According to common practice H atoms attached to C atoms were nevertheless kept in ideal positions during the
The isotropic atomic displacement parameters of hydrogen atoms were evaluated as 1.2*Ueq of the parent atom.Benzimidazole-2-thione and their derivatives exhibit potential applications in many areas such as: pharmacological (Zhang et al. 2001, 2007; Monforte et al. 2008) and industrial (Mazloum et al. 2000; Perrin & Pagetti, 1998). This compound has been synthesized by reaction of o-phenylenediamine with carbon disulfide in presence of KOH (Wang & Liu, 2007 ) or tertiary
(Wang & Liu,1996). Further substitution of heterocyclic system could be obtained by N-alkylation with an alkylating agent. As a part of our research on the structure and properties of cage, we have recently started a study on the reactivity of 6H,13H-5:12,7:14-dimethanedibenzo-[d,i][1,3,6,8]-tetraazecine (DMDBTA) (Rivera et al., 2008, Rivera & Maldonado 2006). In our recent investigation, when we carried out the reaction between DMDBTA and carbon disulfide in ethyl alcohol, the cyclic thiourea 1,3-bis(ethoxymethyl)-1,3-dihydro-2H-benzimidazole-2-thione was obtained and its was determined.The molecular structure of the title compound, a new benzimidazole-2-thione derivative, is shown in Fig. 1. The bond lengths and angles are within normal ranges and are comparable with the related structures (Odabaşoğlu et al., 2007). The
is further stabilized by intermolecular C—H···S interactions which link neighbouring molecules into 1-D extended chains along the a axis. The interesting feature of the is C—H···S distance (2.88 Å), which is shorter than the sum of the Van der Waals radii of S and H by 0.12 Å. A weak intermolecular C—H···O interaction helps to establish the crystal packing which link neighbouring molecules into 1-D extended chains along the b-axis (Fig. 2). This X-ray analysis also shows that both the C8—O1 [1.406 (2) A] and C11—O2 [1.407 (2) A] bonds appear to be shorter than the normal C—O bond-length, whereas the other C—O bond lengths are more agreement with the typical 1.45 Å. This information indicates that the shortening of these bonds suggests some degrees of double bond character.For related structures, see: Odabaşoğlu et al. (2007). For applications and uses of benzimidazole-2-thiones, see: Zhang et al. (2001, 2007); Monforte et al. (2008); Mazloum et al. (2000); Perrin & Pagetti (1998). For chemical background on the synthesis of the title compound, see: Wang & Liu (1996, 2007); Rivera et al. (2006, 2008).
Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell
CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SIR2002 (Burla et al., 2003); program(s) used to refine structure: JANA2006 (Petříček et al., 2006); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: JANA2006 (Petříček et al., 2006).C13H18N2O2S | F(000) = 568 |
Mr = 266.4 | Dx = 1.341 Mg m−3 |
Monoclinic, P21/n | Cu Kα radiation, λ = 1.54184 Å |
Hall symbol: -P 2yn | Cell parameters from 7933 reflections |
a = 4.7176 (2) Å | θ = 3.7–62.4° |
b = 16.0664 (6) Å | µ = 2.14 mm−1 |
c = 17.5128 (6) Å | T = 120 K |
β = 96.524 (3)° | Needle, colorless |
V = 1318.78 (9) Å3 | 0.36 × 0.09 × 0.07 mm |
Z = 4 |
Oxford diffraction Xcalibur diffractometer with an Atlas (Gemini ultra Cu) detector | 2096 independent reflections |
Radiation source: X-ray tube | 1718 reflections with I > 3σ(I) |
Mirror monochromator | Rint = 0.035 |
Detector resolution: 10.3784 pixels mm-1 | θmax = 62.3°, θmin = 3.7° |
Rotation method data acquisition using ω scans | h = −5→5 |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2009) | k = −17→18 |
Tmin = 0.239, Tmax = 1.000 | l = −19→19 |
11526 measured reflections |
Refinement on F2 | 72 constraints |
R[F > 3σ(F)] = 0.038 | H-atom parameters constrained |
wR(F) = 0.110 | Weighting scheme based on measured s.u.'s w = 1/[σ2(I) + 0.0016I2] |
S = 2.09 | (Δ/σ)max = 0.001 |
2096 reflections | Δρmax = 0.40 e Å−3 |
163 parameters | Δρmin = −0.20 e Å−3 |
0 restraints |
C13H18N2O2S | V = 1318.78 (9) Å3 |
Mr = 266.4 | Z = 4 |
Monoclinic, P21/n | Cu Kα radiation |
a = 4.7176 (2) Å | µ = 2.14 mm−1 |
b = 16.0664 (6) Å | T = 120 K |
c = 17.5128 (6) Å | 0.36 × 0.09 × 0.07 mm |
β = 96.524 (3)° |
Oxford diffraction Xcalibur diffractometer with an Atlas (Gemini ultra Cu) detector | 2096 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2009) | 1718 reflections with I > 3σ(I) |
Tmin = 0.239, Tmax = 1.000 | Rint = 0.035 |
11526 measured reflections | θmax = 62.3° |
R[F > 3σ(F)] = 0.038 | 0 restraints |
wR(F) = 0.110 | H-atom parameters constrained |
S = 2.09 | Δρmax = 0.40 e Å−3 |
2096 reflections | Δρmin = −0.20 e Å−3 |
163 parameters |
Experimental. CrysAlisPro, Oxford Diffraction Ltd., Version 1.171.33.51 (release 27-10-2009 CrysAlis171 .NET) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
Refinement. The refinement was carried out against all reflections. The conventional R-factor is always based on F. The goodness of fit as well as the weighted R-factor are based on F and F2 for refinement carried out on F and F2, respectively. The threshold expression is used only for calculating R-factors etc. and it is not relevant to the choice of reflections for refinement. The program used for refinement, Jana2006, uses the weighting scheme based on the experimental expectations, see _refine_ls_weighting_details, that does not force S to be one. Therefore the values of S are usually larger than the ones from the SHELX program. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.66272 (9) | 0.13029 (3) | 0.10850 (3) | 0.01931 (18) | |
O1 | 0.2405 (3) | −0.07593 (7) | 0.17048 (7) | 0.0188 (4) | |
O2 | 0.2199 (3) | 0.33197 (7) | 0.16433 (7) | 0.0195 (4) | |
N1 | 0.3657 (3) | 0.06085 (9) | 0.21698 (8) | 0.0149 (5) | |
N2 | 0.3556 (3) | 0.19758 (9) | 0.21569 (8) | 0.0145 (5) | |
C1 | 0.4612 (4) | 0.12960 (10) | 0.18039 (10) | 0.0155 (5) | |
C2 | 0.1990 (4) | 0.08518 (11) | 0.27371 (10) | 0.0146 (5) | |
C3 | 0.1912 (4) | 0.17210 (11) | 0.27292 (10) | 0.0139 (5) | |
C4 | 0.0581 (4) | 0.03918 (11) | 0.32458 (10) | 0.0177 (6) | |
C5 | −0.0933 (4) | 0.08446 (12) | 0.37497 (11) | 0.0208 (6) | |
C6 | −0.0995 (4) | 0.17090 (12) | 0.37354 (11) | 0.0206 (6) | |
C7 | 0.0434 (4) | 0.21684 (11) | 0.32276 (10) | 0.0175 (6) | |
C8 | 0.4585 (4) | −0.02431 (11) | 0.20549 (11) | 0.0176 (6) | |
C9 | 0.1567 (4) | −0.05799 (11) | 0.09047 (10) | 0.0184 (6) | |
C10 | −0.0375 (4) | −0.12746 (11) | 0.05950 (11) | 0.0226 (6) | |
C11 | 0.4382 (4) | 0.28343 (10) | 0.20354 (11) | 0.0175 (6) | |
C12 | 0.1586 (4) | 0.31173 (12) | 0.08429 (10) | 0.0202 (6) | |
C13 | −0.0308 (4) | 0.37927 (12) | 0.04732 (12) | 0.0271 (7) | |
H4 | 0.063937 | −0.020541 | 0.325288 | 0.0212* | |
H5 | −0.194831 | 0.055195 | 0.411191 | 0.0249* | |
H6 | −0.206135 | 0.199806 | 0.408844 | 0.0247* | |
H7 | 0.039587 | 0.276581 | 0.322332 | 0.021* | |
H8a | 0.615369 | −0.023937 | 0.175068 | 0.0211* | |
H8b | 0.53383 | −0.047767 | 0.254005 | 0.0211* | |
H9a | 0.322743 | −0.056905 | 0.063475 | 0.0221* | |
H9b | 0.054516 | −0.006229 | 0.085929 | 0.0221* | |
H10a | −0.113617 | −0.114992 | 0.007583 | 0.0271* | |
H10b | 0.068439 | −0.178548 | 0.060477 | 0.0271* | |
H10c | −0.191054 | −0.133156 | 0.090688 | 0.0271* | |
H11a | 0.50122 | 0.308783 | 0.252159 | 0.021* | |
H11b | 0.602547 | 0.284351 | 0.17585 | 0.021* | |
H12a | 0.060143 | 0.259395 | 0.079039 | 0.0242* | |
H12b | 0.333216 | 0.31009 | 0.061016 | 0.0242* | |
H13a | −0.091255 | 0.364675 | −0.005165 | 0.0325* | |
H13b | −0.194805 | 0.385461 | 0.07462 | 0.0325* | |
H13c | 0.07297 | 0.430762 | 0.048906 | 0.0325* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0197 (3) | 0.0185 (3) | 0.0207 (3) | −0.00013 (18) | 0.0067 (2) | −0.00118 (18) |
O1 | 0.0274 (7) | 0.0112 (6) | 0.0176 (7) | −0.0036 (5) | 0.0012 (5) | −0.0003 (5) |
O2 | 0.0273 (8) | 0.0129 (7) | 0.0181 (7) | 0.0033 (5) | 0.0022 (6) | 0.0001 (5) |
N1 | 0.0165 (8) | 0.0109 (8) | 0.0174 (8) | −0.0002 (6) | 0.0020 (6) | −0.0006 (6) |
N2 | 0.0164 (8) | 0.0103 (7) | 0.0169 (8) | 0.0000 (6) | 0.0025 (6) | −0.0016 (6) |
C1 | 0.0147 (9) | 0.0146 (10) | 0.0164 (9) | −0.0007 (7) | −0.0020 (7) | −0.0016 (7) |
C2 | 0.0136 (9) | 0.0145 (9) | 0.0155 (9) | 0.0008 (7) | 0.0003 (7) | −0.0027 (7) |
C3 | 0.0128 (9) | 0.0140 (9) | 0.0141 (9) | −0.0018 (7) | −0.0013 (7) | 0.0009 (7) |
C4 | 0.0194 (10) | 0.0124 (10) | 0.0205 (10) | −0.0012 (7) | −0.0008 (8) | 0.0005 (7) |
C5 | 0.0210 (10) | 0.0232 (10) | 0.0179 (10) | −0.0055 (8) | 0.0015 (8) | 0.0052 (8) |
C6 | 0.0211 (10) | 0.0212 (10) | 0.0201 (10) | 0.0027 (8) | 0.0051 (8) | −0.0025 (8) |
C7 | 0.0191 (10) | 0.0124 (10) | 0.0205 (10) | 0.0017 (7) | −0.0003 (8) | −0.0009 (7) |
C8 | 0.0203 (10) | 0.0106 (9) | 0.0215 (10) | 0.0029 (7) | 0.0006 (8) | −0.0028 (7) |
C9 | 0.0219 (10) | 0.0148 (9) | 0.0185 (9) | 0.0028 (7) | 0.0029 (7) | 0.0016 (7) |
C10 | 0.0255 (11) | 0.0201 (11) | 0.0216 (10) | 0.0000 (8) | 0.0003 (8) | −0.0013 (8) |
C11 | 0.0220 (11) | 0.0115 (9) | 0.0186 (10) | −0.0033 (7) | 0.0007 (7) | 0.0005 (7) |
C12 | 0.0244 (11) | 0.0182 (10) | 0.0181 (10) | −0.0043 (8) | 0.0026 (8) | −0.0014 (7) |
C13 | 0.0275 (11) | 0.0282 (12) | 0.0246 (11) | 0.0005 (8) | −0.0011 (9) | 0.0036 (8) |
S1—C1 | 1.6618 (19) | C6—H6 | 0.96 |
O1—C8 | 1.406 (2) | C7—H7 | 0.96 |
O1—C9 | 1.441 (2) | C8—H8a | 0.96 |
O2—C11 | 1.407 (2) | C8—H8b | 0.96 |
O2—C12 | 1.436 (2) | C9—C10 | 1.505 (3) |
N1—C1 | 1.378 (2) | C9—H9a | 0.96 |
N1—C2 | 1.392 (2) | C9—H9b | 0.96 |
N1—C8 | 1.457 (2) | C10—H10a | 0.96 |
N2—C1 | 1.376 (2) | C10—H10b | 0.96 |
N2—C3 | 1.397 (2) | C10—H10c | 0.96 |
N2—C11 | 1.456 (2) | C11—H11a | 0.96 |
C2—C3 | 1.397 (2) | C11—H11b | 0.96 |
C2—C4 | 1.384 (3) | C12—C13 | 1.504 (3) |
C3—C7 | 1.379 (3) | C12—H12a | 0.96 |
C4—C5 | 1.401 (3) | C12—H12b | 0.96 |
C4—H4 | 0.96 | C13—H13a | 0.96 |
C5—C6 | 1.389 (3) | C13—H13b | 0.96 |
C5—H5 | 0.96 | C13—H13c | 0.96 |
C6—C7 | 1.388 (3) | ||
C8—O1—C9 | 114.35 (13) | N1—C8—H8b | 109.4708 |
C11—O2—C12 | 113.95 (13) | H8a—C8—H8b | 105.1992 |
C1—N1—C2 | 110.36 (14) | O1—C9—C10 | 106.89 (14) |
C1—N1—C8 | 124.70 (15) | O1—C9—H9a | 109.4714 |
C2—N1—C8 | 124.42 (15) | O1—C9—H9b | 109.4714 |
C1—N2—C3 | 110.40 (14) | C10—C9—H9a | 109.4711 |
C1—N2—C11 | 124.75 (15) | C10—C9—H9b | 109.4713 |
C3—N2—C11 | 124.23 (15) | H9a—C9—H9b | 111.9358 |
S1—C1—N1 | 127.08 (13) | C9—C10—H10a | 109.4709 |
S1—C1—N2 | 127.05 (13) | C9—C10—H10b | 109.4709 |
N1—C1—N2 | 105.86 (15) | C9—C10—H10c | 109.4713 |
N1—C2—C3 | 106.86 (15) | H10a—C10—H10b | 109.4713 |
N1—C2—C4 | 131.39 (16) | H10a—C10—H10c | 109.4718 |
C3—C2—C4 | 121.75 (16) | H10b—C10—H10c | 109.4711 |
N2—C3—C2 | 106.50 (15) | O2—C11—N2 | 113.78 (14) |
N2—C3—C7 | 131.54 (16) | O2—C11—H11a | 109.4713 |
C2—C3—C7 | 121.95 (17) | O2—C11—H11b | 109.4723 |
C2—C4—C5 | 116.41 (16) | N2—C11—H11a | 109.4702 |
C2—C4—H4 | 121.7924 | N2—C11—H11b | 109.4712 |
C5—C4—H4 | 121.793 | H11a—C11—H11b | 104.7886 |
C4—C5—C6 | 121.26 (18) | O2—C12—C13 | 107.50 (15) |
C4—C5—H5 | 119.3691 | O2—C12—H12a | 109.4709 |
C6—C5—H5 | 119.369 | O2—C12—H12b | 109.4714 |
C5—C6—C7 | 122.17 (18) | C13—C12—H12a | 109.4711 |
C5—C6—H6 | 118.9156 | C13—C12—H12b | 109.4711 |
C7—C6—H6 | 118.916 | H12a—C12—H12b | 111.3742 |
C3—C7—C6 | 116.46 (17) | C12—C13—H13a | 109.4719 |
C3—C7—H7 | 121.7704 | C12—C13—H13b | 109.4712 |
C6—C7—H7 | 121.771 | C12—C13—H13c | 109.471 |
O1—C8—N1 | 113.43 (14) | H13a—C13—H13b | 109.471 |
O1—C8—H8a | 109.4721 | H13a—C13—H13c | 109.4706 |
O1—C8—H8b | 109.4715 | H13b—C13—H13c | 109.4717 |
N1—C8—H8a | 109.4706 |
D—H···A | D—H | H···A | D···A | D—H···A |
C4—H4···O2i | 0.95 | 2.57 | 3.489 (2) | 158.46 |
C7—H7···O1ii | 0.95 | 2.58 | 3.480 (2) | 155.41 |
C8—H8a···S1 | 0.95 | 2.75 | 3.2180 (19) | 110.16 |
C11—H11b···S1 | 0.95 | 2.77 | 3.2166 (19) | 109.21 |
C12—H12a···S1iii | 0.96 | 2.88 | 3.7915 (19) | 158.58 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1/2, y+1/2, −z+1/2; (iii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C13H18N2O2S |
Mr | 266.4 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 120 |
a, b, c (Å) | 4.7176 (2), 16.0664 (6), 17.5128 (6) |
β (°) | 96.524 (3) |
V (Å3) | 1318.78 (9) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 2.14 |
Crystal size (mm) | 0.36 × 0.09 × 0.07 |
Data collection | |
Diffractometer | Oxford diffraction Xcalibur diffractometer with an Atlas (Gemini ultra Cu) detector |
Absorption correction | Multi-scan (CrysAlis PRO; Oxford Diffraction, 2009) |
Tmin, Tmax | 0.239, 1.000 |
No. of measured, independent and observed [I > 3σ(I)] reflections | 11526, 2096, 1718 |
Rint | 0.035 |
θmax (°) | 62.3 |
(sin θ/λ)max (Å−1) | 0.574 |
Refinement | |
R[F > 3σ(F)], wR(F), S | 0.038, 0.110, 2.09 |
No. of reflections | 2096 |
No. of parameters | 163 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.40, −0.20 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2009), CrysAlis RED (Oxford Diffraction, 2009), SIR2002 (Burla et al., 2003), JANA2006 (Petříček et al., 2006), DIAMOND (Brandenburg & Putz, 2005).
D—H···A | D—H | H···A | D···A | D—H···A |
C4—H4···O2i | 0.95 | 2.57 | 3.489 (2) | 158.46 |
C7—H7···O1ii | 0.95 | 2.58 | 3.480 (2) | 155.41 |
C12—H12a···S1iii | 0.96 | 2.88 | 3.7915 (19) | 158.58 |
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1/2, y+1/2, −z+1/2; (iii) x−1, y, z. |
Acknowledgements
The authors acknowledge the Dirección de Investigaciones Sede Bogotá (DIB) of Universidad Nacional de Colombia, the institutional research plan No. AVOZ10100521 of the Institute of Physics and the project Praemium Academiae of the Academy of Sciences of the Czech Republic for financial support.
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Benzimidazole-2-thione and their derivatives exhibit potential applications in many areas such as: pharmacological (Zhang et al. 2001, 2007; Monforte et al. 2008) and industrial (Mazloum et al. 2000; Perrin & Pagetti, 1998). This compound has been synthesized by reaction of o-phenylenediamine with carbon disulfide in presence of KOH (Wang & Liu, 2007 ) or tertiary amines (Wang & Liu,1996). Further substitution of heterocyclic system could be obtained by N-alkylation with an alkylating agent. As a part of our research on the structure and properties of aminals cage, we have recently started a study on the reactivity of 6H,13H-5:12,7:14-dimethanedibenzo-[d,i][1,3,6,8]-tetraazecine (DMDBTA) (Rivera et al., 2008, Rivera & Maldonado 2006). In our recent investigation, when we carried out the reaction between DMDBTA and carbon disulfide in ethyl alcohol, the cyclic thiourea 1,3-bis(ethoxymethyl)-1,3-dihydro-2H-benzimidazole-2-thione was obtained and its crystal structure was determined.
The molecular structure of the title compound, a new benzimidazole-2-thione derivative, is shown in Fig. 1. The bond lengths and angles are within normal ranges and are comparable with the related structures (Odabaşoğlu et al., 2007). The crystal structure is further stabilized by intermolecular C—H···S interactions which link neighbouring molecules into 1-D extended chains along the a axis. The interesting feature of the crystal structure is C—H···S distance (2.88 Å), which is shorter than the sum of the Van der Waals radii of S and H by 0.12 Å. A weak intermolecular C—H···O interaction helps to establish the crystal packing which link neighbouring molecules into 1-D extended chains along the b-axis (Fig. 2). This X-ray analysis also shows that both the C8—O1 [1.406 (2) A] and C11—O2 [1.407 (2) A] bonds appear to be shorter than the normal C—O bond-length, whereas the other C—O bond lengths are more agreement with the typical 1.45 Å. This information indicates that the shortening of these bonds suggests some degrees of double bond character.