organic compounds
1,3-Bis(2-anilino-2-oxoethyl)-1H-imidazol-3-ium chloride acetonitrile monosolvate
aNational Changhua University of Education, Department of Chemistry, Changhua, Taiwan 50058
*Correspondence e-mail: leehm@cc.ncue.edu.tw
In the title compound, C19H19N4O2+·Cl−·C2H3N, the dihedral angle between the two phenyl rings is 69.57 (8)° while the dihedral angles between the imidazole ring and the phenyl rings are 70.61 (7) and 82.11 (7)°. In the crystal, N—H⋯Cl, C—H⋯O, C—H⋯Cl and C—H⋯N hydrogen bonds link the imidazolium cations, chloride anions and acetonitrile solvent molecules into a two-dimensional hydrogen-bonded network parallel to (001); an intramolecular C—H⋯O hydrogen bond is also observed.
Related literature
For the crystal structures of nickel, palladium, and silver complexes with ligands derived from the title compound, see: Liao, Chan, Chang et al. (2007), Liao, Chan, Zeng et al. (2007) and Liao et al. (2008), respectively.
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: DIAMOND (Brandenburg, 2006).
Supporting information
https://doi.org/10.1107/S1600536811048410/wn2459sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811048410/wn2459Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811048410/wn2459Isup3.cml
The compound was prepared according to the literature procedure (Liao, Chan, Zeng et al., 2007). Suitable crystals were obtained by slow diffusion of diethyl ether into an acetonitrile solution of the compound at room temperature.
All H atoms could have been detected in the difference Fourier map; nevertheless, all H atoms were positioned geometrically and refined as riding atoms, with Csp2—H = 0.95, C(methyl)—H = 0.98, C(methylene)—H = 0.99, and N—H = 0.88 Å; Uiso(H) = xUeq(C,N), where x = 1.5 for methyl H and 1.2 for all other H atoms.
The title compound, C19H19N4O+.Cl-.C2H3N, is a precursor for N-heterocyclic carbene (NHC) ligands. Nickel (Liao, Chan, Chang et al., 2007), palladium (Liao, Chan, Zeng et al., 2007) and silver (Liao et al., 2008) complexes with NHC ligands derived from the salt have been reported by us previously.
The
of the title compound is shown in Fig. 1. The dihedral angle between the two phenyl rings is 69.57 (8)°; the dihedral angles between the imidazole ring and the phenyl rings are 70.61 (7)° for [C6–C11] and 82.11 (7)° for [C14–C19].After deprotonation and metal coordination via C2, the N—C—N bond angles become slightly smaller. The N—C—N bond angle in the title compound is 108.59 (17)°, whereas the angles are 105.5 (2) and 106.3 (3) ° in the palladium complex (Liao, Chan, Zeng et al., 2007), 104.4 (4)° in the silver complex (Liao et al., 2008) and 104.9 (4)° in the nickel complex (Liao, Chan, Chang et al., 2007).
One non-classical intramolecular C—H···O hydrogen bond has been detected (Table 1), whereas classical and non-classical intermolecular hydrogen bonds of the type N—H···Cl, C—H···Cl, C—H···O and C—H···N link the imidazolium cations, chloride anions and the acetonitrile molecules into a two-dimensional hydrogen-bonded network (Fig. 2).
For the crystal structures of nickel, palladium, and silver complexes with ligands derived from the title compound, see: Liao, Chan, Chang et al. (2007), Liao, Chan, Zeng et al. (2007) and Liao et al. (2008), respectively.
Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: DIAMOND (Brandenburg, 2006).Fig. 1. The structure of the title compound, showing 50% probability displacement ellipsoids for the non-hydrogen atoms. The H atoms are shown as spheres of arbitrary radius. | |
Fig. 2. A view of the crystal packing along the c axis, displaying the hydrogen bonds as dashed lines. |
C19H19N4O2+·Cl−·C2H3N | Z = 2 |
Mr = 411.89 | F(000) = 432 |
Triclinic, P1 | Dx = 1.294 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.7801 (6) Å | Cell parameters from 2360 reflections |
b = 10.4544 (6) Å | θ = 2.5–23.9° |
c = 12.1998 (7) Å | µ = 0.21 mm−1 |
α = 91.842 (4)° | T = 150 K |
β = 95.492 (4)° | Block, white |
γ = 108.096 (4)° | 0.22 × 0.20 × 0.15 mm |
V = 1057.28 (11) Å3 |
Bruker SMART APEXII diffractometer | 5067 independent reflections |
Radiation source: fine-focus sealed tube | 3597 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.040 |
ω scans | θmax = 28.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | h = −11→11 |
Tmin = 0.956, Tmax = 0.970 | k = −13→13 |
13815 measured reflections | l = −16→16 |
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)] = 0.048 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.129 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0538P)2 + 0.377P] where P = (Fo2 + 2Fc2)/3 |
5067 reflections | (Δ/σ)max = 0.001 |
257 parameters | Δρmax = 0.96 e Å−3 |
0 restraints | Δρmin = −0.90 e Å−3 |
C19H19N4O2+·Cl−·C2H3N | γ = 108.096 (4)° |
Mr = 411.89 | V = 1057.28 (11) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.7801 (6) Å | Mo Kα radiation |
b = 10.4544 (6) Å | µ = 0.21 mm−1 |
c = 12.1998 (7) Å | T = 150 K |
α = 91.842 (4)° | 0.22 × 0.20 × 0.15 mm |
β = 95.492 (4)° |
Bruker SMART APEXII diffractometer | 5067 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 3597 reflections with I > 2σ(I) |
Tmin = 0.956, Tmax = 0.970 | Rint = 0.040 |
13815 measured reflections |
R[F2 > 2σ(F2)] = 0.048 | 0 restraints |
wR(F2) = 0.129 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.96 e Å−3 |
5067 reflections | Δρmin = −0.90 e Å−3 |
257 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.5447 (2) | 0.28079 (19) | 0.54543 (15) | 0.0241 (4) | |
H1 | 0.5994 | 0.2311 | 0.5071 | 0.029* | |
C2 | 0.3554 (2) | 0.3390 (2) | 0.62012 (16) | 0.0305 (4) | |
H2 | 0.2536 | 0.3360 | 0.6423 | 0.037* | |
C3 | 0.4941 (2) | 0.4426 (2) | 0.64010 (17) | 0.0310 (5) | |
H3 | 0.5086 | 0.5259 | 0.6798 | 0.037* | |
C4 | 0.2737 (2) | 0.11100 (19) | 0.51452 (16) | 0.0275 (4) | |
H4A | 0.1824 | 0.0846 | 0.5598 | 0.033* | |
H4B | 0.3256 | 0.0394 | 0.5162 | 0.033* | |
C5 | 0.2105 (2) | 0.12423 (19) | 0.39559 (15) | 0.0247 (4) | |
C6 | 0.0091 (2) | −0.0133 (2) | 0.24692 (16) | 0.0261 (4) | |
C7 | −0.0460 (3) | 0.0873 (2) | 0.20240 (17) | 0.0356 (5) | |
H7 | −0.0171 | 0.1739 | 0.2400 | 0.043* | |
C8 | −0.1437 (3) | 0.0597 (2) | 0.10267 (19) | 0.0429 (6) | |
H8 | −0.1814 | 0.1282 | 0.0721 | 0.052* | |
C9 | −0.1872 (3) | −0.0659 (2) | 0.04710 (19) | 0.0440 (6) | |
H9 | −0.2535 | −0.0836 | −0.0214 | 0.053* | |
C10 | −0.1329 (3) | −0.1656 (2) | 0.09242 (19) | 0.0431 (6) | |
H10 | −0.1628 | −0.2523 | 0.0549 | 0.052* | |
C11 | −0.0351 (2) | −0.1401 (2) | 0.19235 (18) | 0.0336 (5) | |
H11 | 0.0013 | −0.2092 | 0.2231 | 0.040* | |
C12 | 0.7777 (2) | 0.4883 (2) | 0.59194 (16) | 0.0266 (4) | |
H12A | 0.7821 | 0.5827 | 0.5810 | 0.032* | |
H12B | 0.8238 | 0.4563 | 0.5296 | 0.032* | |
C13 | 0.8785 (2) | 0.4833 (2) | 0.69954 (16) | 0.0261 (4) | |
C14 | 1.1599 (2) | 0.59148 (19) | 0.78694 (15) | 0.0255 (4) | |
C15 | 1.3085 (2) | 0.6761 (2) | 0.76428 (17) | 0.0305 (4) | |
H15 | 1.3176 | 0.7179 | 0.6961 | 0.037* | |
C16 | 1.4440 (2) | 0.7002 (2) | 0.84055 (18) | 0.0350 (5) | |
H16 | 1.5457 | 0.7569 | 0.8240 | 0.042* | |
C17 | 1.4306 (3) | 0.6414 (2) | 0.94059 (18) | 0.0380 (5) | |
H17 | 1.5229 | 0.6573 | 0.9929 | 0.046* | |
C18 | 1.2824 (3) | 0.5596 (2) | 0.96405 (18) | 0.0400 (5) | |
H18 | 1.2734 | 0.5204 | 1.0333 | 0.048* | |
C19 | 1.1455 (2) | 0.5332 (2) | 0.88779 (17) | 0.0335 (5) | |
H19 | 1.0442 | 0.4762 | 0.9046 | 0.040* | |
C20 | 0.5812 (3) | 0.1257 (3) | 0.8373 (2) | 0.0472 (4) | |
H20A | 0.6785 | 0.2017 | 0.8313 | 0.071* | |
H20B | 0.6011 | 0.0734 | 0.8992 | 0.071* | |
H20C | 0.4918 | 0.1598 | 0.8499 | 0.071* | |
C21 | 0.5404 (3) | 0.0403 (3) | 0.7362 (2) | 0.0472 (4) | |
Cl1 | 0.07301 (6) | 0.75633 (5) | 0.49516 (4) | 0.03031 (14) | |
N1 | 0.38999 (17) | 0.23796 (16) | 0.56116 (12) | 0.0244 (3) | |
N2 | 0.61030 (17) | 0.40496 (15) | 0.59229 (12) | 0.0238 (3) | |
N3 | 0.10210 (18) | 0.00739 (16) | 0.35129 (13) | 0.0265 (4) | |
H3A | 0.0878 | −0.0630 | 0.3914 | 0.032* | |
N4 | 1.02870 (18) | 0.57136 (16) | 0.70405 (13) | 0.0263 (4) | |
H4 | 1.0477 | 0.6231 | 0.6482 | 0.032* | |
N5 | 0.5089 (2) | −0.0260 (2) | 0.65673 (17) | 0.0439 (5) | |
O1 | 0.25525 (16) | 0.22902 (13) | 0.34914 (11) | 0.0291 (3) | |
O2 | 0.82600 (17) | 0.40675 (16) | 0.77037 (12) | 0.0387 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0221 (9) | 0.0205 (9) | 0.0291 (9) | 0.0059 (7) | 0.0011 (7) | 0.0047 (7) |
C2 | 0.0240 (9) | 0.0343 (12) | 0.0340 (10) | 0.0116 (9) | 0.0005 (8) | −0.0007 (9) |
C3 | 0.0265 (10) | 0.0311 (11) | 0.0363 (11) | 0.0121 (9) | −0.0005 (8) | −0.0058 (9) |
C4 | 0.0208 (9) | 0.0232 (10) | 0.0328 (10) | −0.0004 (8) | −0.0012 (7) | 0.0044 (8) |
C5 | 0.0168 (8) | 0.0237 (10) | 0.0329 (10) | 0.0055 (7) | 0.0011 (7) | 0.0022 (8) |
C6 | 0.0183 (8) | 0.0273 (10) | 0.0304 (10) | 0.0042 (8) | 0.0008 (7) | 0.0031 (8) |
C7 | 0.0351 (11) | 0.0306 (12) | 0.0392 (11) | 0.0118 (9) | −0.0074 (9) | −0.0044 (9) |
C8 | 0.0421 (13) | 0.0409 (13) | 0.0448 (13) | 0.0168 (11) | −0.0129 (10) | 0.0025 (10) |
C9 | 0.0399 (13) | 0.0430 (14) | 0.0411 (12) | 0.0076 (11) | −0.0135 (10) | −0.0044 (10) |
C10 | 0.0414 (13) | 0.0334 (13) | 0.0459 (13) | 0.0040 (10) | −0.0075 (10) | −0.0097 (10) |
C11 | 0.0294 (10) | 0.0250 (11) | 0.0423 (12) | 0.0043 (8) | −0.0016 (9) | 0.0014 (9) |
C12 | 0.0206 (9) | 0.0229 (10) | 0.0326 (10) | 0.0027 (7) | −0.0024 (7) | 0.0042 (8) |
C13 | 0.0224 (9) | 0.0241 (10) | 0.0302 (10) | 0.0061 (8) | −0.0004 (7) | 0.0027 (8) |
C14 | 0.0232 (9) | 0.0236 (10) | 0.0279 (9) | 0.0066 (8) | −0.0023 (7) | −0.0008 (8) |
C15 | 0.0269 (10) | 0.0291 (11) | 0.0323 (10) | 0.0048 (8) | 0.0010 (8) | 0.0010 (8) |
C16 | 0.0223 (10) | 0.0343 (12) | 0.0431 (12) | 0.0033 (9) | −0.0011 (8) | −0.0045 (9) |
C17 | 0.0305 (11) | 0.0399 (13) | 0.0392 (12) | 0.0102 (9) | −0.0124 (9) | −0.0039 (10) |
C18 | 0.0387 (12) | 0.0432 (13) | 0.0334 (11) | 0.0096 (10) | −0.0074 (9) | 0.0041 (10) |
C19 | 0.0278 (10) | 0.0337 (12) | 0.0337 (11) | 0.0035 (9) | −0.0016 (8) | 0.0047 (9) |
C20 | 0.0476 (10) | 0.0426 (10) | 0.0472 (10) | 0.0069 (8) | 0.0084 (8) | 0.0076 (8) |
C21 | 0.0476 (10) | 0.0426 (10) | 0.0472 (10) | 0.0069 (8) | 0.0084 (8) | 0.0076 (8) |
Cl1 | 0.0255 (2) | 0.0263 (3) | 0.0385 (3) | 0.00651 (19) | 0.00336 (18) | 0.0089 (2) |
N1 | 0.0181 (7) | 0.0238 (9) | 0.0290 (8) | 0.0039 (6) | −0.0009 (6) | 0.0038 (6) |
N2 | 0.0186 (7) | 0.0217 (8) | 0.0298 (8) | 0.0061 (6) | −0.0024 (6) | 0.0019 (6) |
N3 | 0.0228 (8) | 0.0211 (8) | 0.0323 (8) | 0.0031 (7) | −0.0015 (6) | 0.0048 (7) |
N4 | 0.0217 (8) | 0.0252 (9) | 0.0282 (8) | 0.0027 (7) | −0.0015 (6) | 0.0071 (7) |
N5 | 0.0382 (11) | 0.0497 (13) | 0.0481 (12) | 0.0195 (9) | 0.0047 (9) | 0.0088 (10) |
O1 | 0.0266 (7) | 0.0229 (7) | 0.0345 (7) | 0.0035 (6) | 0.0012 (6) | 0.0061 (6) |
O2 | 0.0291 (8) | 0.0409 (9) | 0.0363 (8) | −0.0024 (7) | −0.0021 (6) | 0.0141 (7) |
C1—N1 | 1.327 (2) | C12—N2 | 1.458 (2) |
C1—N2 | 1.330 (2) | C12—C13 | 1.523 (2) |
C1—H1 | 0.9500 | C12—H12A | 0.9900 |
C2—C3 | 1.350 (3) | C12—H12B | 0.9900 |
C2—N1 | 1.385 (2) | C13—O2 | 1.221 (2) |
C2—H2 | 0.9500 | C13—N4 | 1.349 (2) |
C3—N2 | 1.373 (2) | C14—C15 | 1.389 (3) |
C3—H3 | 0.9500 | C14—C19 | 1.390 (3) |
C4—N1 | 1.458 (2) | C14—N4 | 1.416 (2) |
C4—C5 | 1.529 (3) | C15—C16 | 1.390 (3) |
C4—H4A | 0.9900 | C15—H15 | 0.9500 |
C4—H4B | 0.9900 | C16—C17 | 1.383 (3) |
C5—O1 | 1.221 (2) | C16—H16 | 0.9500 |
C5—N3 | 1.352 (2) | C17—C18 | 1.379 (3) |
C6—C11 | 1.388 (3) | C17—H17 | 0.9500 |
C6—C7 | 1.392 (3) | C18—C19 | 1.396 (3) |
C6—N3 | 1.417 (2) | C18—H18 | 0.9500 |
C7—C8 | 1.387 (3) | C19—H19 | 0.9500 |
C7—H7 | 0.9500 | C20—C21 | 1.446 (3) |
C8—C9 | 1.383 (3) | C20—H20A | 0.9800 |
C8—H8 | 0.9500 | C20—H20B | 0.9800 |
C9—C10 | 1.384 (3) | C20—H20C | 0.9800 |
C9—H9 | 0.9500 | C21—N5 | 1.133 (3) |
C10—C11 | 1.390 (3) | N3—H3A | 0.8800 |
C10—H10 | 0.9500 | N4—H4 | 0.8800 |
C11—H11 | 0.9500 | ||
N1—C1—N2 | 108.59 (17) | H12A—C12—H12B | 108.0 |
N1—C1—H1 | 125.7 | O2—C13—N4 | 126.00 (17) |
N2—C1—H1 | 125.7 | O2—C13—C12 | 122.57 (17) |
C3—C2—N1 | 106.85 (17) | N4—C13—C12 | 111.43 (17) |
C3—C2—H2 | 126.6 | C15—C14—C19 | 119.79 (17) |
N1—C2—H2 | 126.6 | C15—C14—N4 | 116.74 (17) |
C2—C3—N2 | 107.19 (17) | C19—C14—N4 | 123.47 (18) |
C2—C3—H3 | 126.4 | C14—C15—C16 | 120.5 (2) |
N2—C3—H3 | 126.4 | C14—C15—H15 | 119.7 |
N1—C4—C5 | 110.81 (15) | C16—C15—H15 | 119.7 |
N1—C4—H4A | 109.5 | C17—C16—C15 | 119.9 (2) |
C5—C4—H4A | 109.5 | C17—C16—H16 | 120.1 |
N1—C4—H4B | 109.5 | C15—C16—H16 | 120.1 |
C5—C4—H4B | 109.5 | C18—C17—C16 | 119.65 (18) |
H4A—C4—H4B | 108.1 | C18—C17—H17 | 120.2 |
O1—C5—N3 | 125.89 (17) | C16—C17—H17 | 120.2 |
O1—C5—C4 | 122.59 (16) | C17—C18—C19 | 121.2 (2) |
N3—C5—C4 | 111.52 (16) | C17—C18—H18 | 119.4 |
C11—C6—C7 | 120.09 (17) | C19—C18—H18 | 119.4 |
C11—C6—N3 | 118.26 (17) | C14—C19—C18 | 119.0 (2) |
C7—C6—N3 | 121.52 (17) | C14—C19—H19 | 120.5 |
C8—C7—C6 | 119.33 (19) | C18—C19—H19 | 120.5 |
C8—C7—H7 | 120.3 | C21—C20—H20A | 109.5 |
C6—C7—H7 | 120.3 | C21—C20—H20B | 109.5 |
C9—C8—C7 | 121.0 (2) | H20A—C20—H20B | 109.5 |
C9—C8—H8 | 119.5 | C21—C20—H20C | 109.5 |
C7—C8—H8 | 119.5 | H20A—C20—H20C | 109.5 |
C8—C9—C10 | 119.3 (2) | H20B—C20—H20C | 109.5 |
C8—C9—H9 | 120.4 | N5—C21—C20 | 179.6 (3) |
C10—C9—H9 | 120.4 | C1—N1—C2 | 108.53 (16) |
C9—C10—C11 | 120.6 (2) | C1—N1—C4 | 125.20 (16) |
C9—C10—H10 | 119.7 | C2—N1—C4 | 126.02 (16) |
C11—C10—H10 | 119.7 | C1—N2—C3 | 108.84 (16) |
C6—C11—C10 | 119.7 (2) | C1—N2—C12 | 125.67 (16) |
C6—C11—H11 | 120.2 | C3—N2—C12 | 125.49 (16) |
C10—C11—H11 | 120.2 | C5—N3—C6 | 126.67 (17) |
N2—C12—C13 | 111.46 (16) | C5—N3—H3A | 116.7 |
N2—C12—H12A | 109.3 | C6—N3—H3A | 116.7 |
C13—C12—H12A | 109.3 | C13—N4—C14 | 128.50 (17) |
N2—C12—H12B | 109.3 | C13—N4—H4 | 115.8 |
C13—C12—H12B | 109.3 | C14—N4—H4 | 115.8 |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···Cl1i | 0.88 | 2.28 | 3.1624 (17) | 175 |
N4—H4···Cl1ii | 0.88 | 2.35 | 3.2287 (17) | 175 |
C4—H4B···N5 | 0.99 | 2.50 | 3.262 (3) | 134 |
C12—H12A···O1iii | 0.99 | 2.25 | 3.126 (2) | 147 |
C12—H12B···Cl1iii | 0.99 | 2.67 | 3.400 (2) | 131 |
C19—H19···O2 | 0.95 | 2.31 | 2.911 (2) | 121 |
C20—H20A···O2 | 0.98 | 2.32 | 3.238 (3) | 156 |
Symmetry codes: (i) x, y−1, z; (ii) x+1, y, z; (iii) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C19H19N4O2+·Cl−·C2H3N |
Mr | 411.89 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 150 |
a, b, c (Å) | 8.7801 (6), 10.4544 (6), 12.1998 (7) |
α, β, γ (°) | 91.842 (4), 95.492 (4), 108.096 (4) |
V (Å3) | 1057.28 (11) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.21 |
Crystal size (mm) | 0.22 × 0.20 × 0.15 |
Data collection | |
Diffractometer | Bruker SMART APEXII |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2003) |
Tmin, Tmax | 0.956, 0.970 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13815, 5067, 3597 |
Rint | 0.040 |
(sin θ/λ)max (Å−1) | 0.660 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.048, 0.129, 1.06 |
No. of reflections | 5067 |
No. of parameters | 257 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.96, −0.90 |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXTL (Sheldrick, 2008), DIAMOND (Brandenburg, 2006).
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···Cl1i | 0.88 | 2.28 | 3.1624 (17) | 175.2 |
N4—H4···Cl1ii | 0.88 | 2.35 | 3.2287 (17) | 174.8 |
C4—H4B···N5 | 0.99 | 2.50 | 3.262 (3) | 134.0 |
C12—H12A···O1iii | 0.99 | 2.25 | 3.126 (2) | 147.1 |
C12—H12B···Cl1iii | 0.99 | 2.67 | 3.400 (2) | 131.0 |
C19—H19···O2 | 0.95 | 2.31 | 2.911 (2) | 120.6 |
C20—H20A···O2 | 0.98 | 2.32 | 3.238 (3) | 155.5 |
Symmetry codes: (i) x, y−1, z; (ii) x+1, y, z; (iii) −x+1, −y+1, −z+1. |
Acknowledgements
We thank the National Science Council of Taiwan for financial support of this work.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The title compound, C19H19N4O+.Cl-.C2H3N, is a precursor for N-heterocyclic carbene (NHC) ligands. Nickel (Liao, Chan, Chang et al., 2007), palladium (Liao, Chan, Zeng et al., 2007) and silver (Liao et al., 2008) complexes with NHC ligands derived from the salt have been reported by us previously.
The crystal structure of the title compound is shown in Fig. 1. The dihedral angle between the two phenyl rings is 69.57 (8)°; the dihedral angles between the imidazole ring and the phenyl rings are 70.61 (7)° for [C6–C11] and 82.11 (7)° for [C14–C19].
After deprotonation and metal coordination via C2, the N—C—N bond angles become slightly smaller. The N—C—N bond angle in the title compound is 108.59 (17)°, whereas the angles are 105.5 (2) and 106.3 (3) ° in the palladium complex (Liao, Chan, Zeng et al., 2007), 104.4 (4)° in the silver complex (Liao et al., 2008) and 104.9 (4)° in the nickel complex (Liao, Chan, Chang et al., 2007).
One non-classical intramolecular C—H···O hydrogen bond has been detected (Table 1), whereas classical and non-classical intermolecular hydrogen bonds of the type N—H···Cl, C—H···Cl, C—H···O and C—H···N link the imidazolium cations, chloride anions and the acetonitrile molecules into a two-dimensional hydrogen-bonded network (Fig. 2).