organic compounds
1-(1H-Benzimidazol-1-ylmethyl)-3-[2-(diisopropylamino)ethyl]-1H-benzimidazolium bromide 0.25-hydrate
aDepartment of Natural Sciences, Fayetteville State University, Fayetteville, NC 28301, USA, bDepartment of Chemistry, Faculty of Pharmacy, Mersin University, Mersin TR 33169, Turkey, cDepartment of Chemistry, Clemson University, Clemson, SC 29634, USA, dDepartment of Chemistry, Faculty of Science and Arts, nönü University, Malatya TR 44280, Turkey, and eDepartment of Chemistry, Faculty of Science, Ege University, Bornova-zmir TR 35100, Turkey
*Correspondence e-mail: hakan.arslan.acad@gmail.com
The title N-heterocyclic carbene derivative, C23H30N5+·Br−·0.25H2O, was synthesized using microwave heating and was characterized by 1H and 13C NMR spectroscopy and a single-crystal X-ray diffraction study. The structure of the title compound are stabilized by a network of intra- and intermolecular C—H⋯Br hydrogen-bonding interactions. The is further stabilized by π–π stacking interactions between benzene and imidazole fragment rings of parallel benzo[d]imidazole rings, with a separation of 3.486 (3) Å between the centroids of the benzene and imidazole rings. There is also an intermolecular C—H⋯π interaction in the The C—N bond lengths for the central benzimidazole ring are shorter than the average single C—N bond, thus showing varying degrees of double-bond character and indicating partial electron delocalization within the C—N—C—N—C fragment. The isopropyl group is disordered over two sites with occupancies of 0.792 (10) and 0.208 (10).
Related literature
For the synthesis, see: Yaşar et al. (2008). For general background, see: Herrmann et al. (1995); Navarro et al. (2006); Arduengo & Krafczyc (1998); Larhed et al. (2002); Leadbeater & Shoemaker (2008). For related compounds, see: Özel Güven et al. (2008a,b,c); Türktekin et al. (2004); Akkurt et al. (2004, 2005, 2007a,b); Arslan et al. (2005, 2007, 2009 and references therein).
Experimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku/MSC, 2006); cell CrystalClear; data reduction: CrystalClear; 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: SHELXTL.
Supporting information
10.1107/S160053680900765X/hg2484sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053680900765X/hg2484Isup2.hkl
All reactions for the preparation of (II) and (III) were carried out under Ar inflame-dried glass-ware using standard Schlenk-type flasks (Fig. 3). All 1H and 13C-NMRs were performed in CDCl3. 1H NMR and 13C NMR spectra were recorded using a Varian As 400 Merkur spectrometer operating at 400 MHz (1H) and 100 MHz (13C). Chemical shifts (δ) are given in p.p.m. relative to TMS, coupling constants (J) in Hz. Melting points were measured in open capillary tubes with an Electrothermal-9200 melting point apparatus and are uncorrected. Microwave assisted reactions were carried out in a self-tuning single mode CEM Discover microwave unit. This consist of a continuous focused microwave power delivery system with operator-selectable power output from 0 to 300 W. The reaction was performed in an 80 ml capacity sealed tube. Temperature, pressure and power profiles were monitored using commercially available software provided by the microwave manufacturer.
Dibromomethane (1.74 g, 10.0 mmol) was slowly added to a solution of N-(2-(1H-benzo[d]imidazol-1-yl)ethyl)-N-isopropylpropan-2-amine (II) (2.45 g, 10.0 mmol) in DMF (5 ml) and the resulting mixture was stirred at 50 oC for 5 h (Fig. 3). Diethylether (10 ml) was added to obtain a white crystalline solid which was filtered off. The solid was washed with diethylether (3x10 ml), dried under vacuum and the crude product (III) was recrystallized from ethanol:diethylether. The yield was 2.72 g, 65%. In a dry 80 ml glass vessel equipped with a magnetic stirbar were added a potassium hydroxide (1 mmol) solution of benzimidazole (1 mmol) in ethanol (20 ml) and compound (III) (1 mmol). The vessel was sealed with a septum and placed in the microwave apparatus. With stirring, the reaction mixture was heated to 100 oC using an initial microwave power of 300 W and was held at this temperature for 10 min. The reaction mixture was then cooled to 50 oC, the solid was filtered off. The solvent was removed under vacuum. The product (I) was recrystallized from ethanol:diethylether (1: 2 ratio). The yield was 3.47 g, 76%, M.p.= 208–209 oC. 1H NMR (δ, 399.9 MHz, CDCl3): 0.87 (d, 12H, J= 6.6 Hz, NCH(CH3)2), 2.98 (t, 2H, J = 6.0 Hz, NCH2CH2N), 3.04 (hept, 2H, J = 6.6 Hz, NCH(CH3)2), 4.58 (t, 2H, J = 6.0 Hz, NCH2CH2N), 5.98 (s, 2H, –CH2–), 7.61–7.77 (m, 9H, C6H4 and NCH=N), 10.96 (s, 1H, NCHN). 13C NMR (δ, CDCl3): 20.8 (NCH(CH3)2), 44.5 (NCH2CH2N), 47.8 (NCH(CH3)2), 48.2 (-CH2–), 112.7, 113.2, 126.4, 126.7, 130.5 and 131.4 (C6H4), 143.4 (NCH=N), 143.6 (NCHN).
The H atoms were geometrically placed and treated as riding atoms with C—H = 0.96 Å, and Uiso(H) = 1.5 Ueq (parent C-atom = CH3). The other H atoms were treated the same with Uiso(H) = 1.2 Ueq (parent C-atom). We were unable to assign H atoms to the water molecule.
The isopropyl group (C22, C23, C24) is disordered. We were able to resolve C22 and C24 into two atoms. The major/minor component ratio is 0.79/0.21. The two minor component atoms were refined isotropically.
Data collection: CrystalClear (Rigaku/MSC, 2006); cell
CrystalClear (Rigaku/MSC, 2006); data reduction: CrystalClear (Rigaku/MSC, 2006); 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: SHELXTL (Sheldrick, 2008).C23H30N5+·Br−·0.25H2O | Z = 2 |
Mr = 460.93 | F(000) = 481 |
Triclinic, P1 | Dx = 1.368 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.4944 (17) Å | Cell parameters from 5869 reflections |
b = 9.4960 (19) Å | θ = 3.2–26.4° |
c = 15.318 (3) Å | µ = 1.86 mm−1 |
α = 83.29 (3)° | T = 153 K |
β = 84.69 (3)° | Rod, colorless |
γ = 65.93 (3)° | 0.34 × 0.12 × 0.10 mm |
V = 1119.1 (5) Å3 |
Rigaku Mercury CCD diffractometer | 3889 independent reflections |
Radiation source: Sealed Tube | 2390 reflections with I > 2σ(I) |
Graphite Monochromator monochromator | Rint = 0.039 |
Detector resolution: 14.6306 pixels mm-1 | θmax = 25.0°, θmin = 3.2° |
ω scans | h = −9→10 |
Absorption correction: multi-scan (REQAB; Jacobson, 1998) | k = −11→11 |
Tmin = 0.571, Tmax = 0.836 | l = −17→18 |
7638 measured reflections |
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)] = 0.054 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.144 | H-atom parameters constrained |
S = 0.98 | w = 1/[σ2(Fo2) + (0.0659P)2] where P = (Fo2 + 2Fc2)/3 |
3889 reflections | (Δ/σ)max = 0.001 |
282 parameters | Δρmax = 0.74 e Å−3 |
22 restraints | Δρmin = −0.71 e Å−3 |
C23H30N5+·Br−·0.25H2O | γ = 65.93 (3)° |
Mr = 460.93 | V = 1119.1 (5) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.4944 (17) Å | Mo Kα radiation |
b = 9.4960 (19) Å | µ = 1.86 mm−1 |
c = 15.318 (3) Å | T = 153 K |
α = 83.29 (3)° | 0.34 × 0.12 × 0.10 mm |
β = 84.69 (3)° |
Rigaku Mercury CCD diffractometer | 3889 independent reflections |
Absorption correction: multi-scan (REQAB; Jacobson, 1998) | 2390 reflections with I > 2σ(I) |
Tmin = 0.571, Tmax = 0.836 | Rint = 0.039 |
7638 measured reflections |
R[F2 > 2σ(F2)] = 0.054 | 22 restraints |
wR(F2) = 0.144 | H-atom parameters constrained |
S = 0.98 | Δρmax = 0.74 e Å−3 |
3889 reflections | Δρmin = −0.71 e Å−3 |
282 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 | Occ. (<1) | |
Br1 | 0.78369 (7) | 0.88546 (6) | 0.57962 (4) | 0.05288 (19) | |
N1 | 0.6315 (5) | 0.5169 (5) | 0.6422 (2) | 0.0430 (10) | |
N2 | 0.3772 (6) | 0.7103 (4) | 0.6314 (3) | 0.0499 (11) | |
N3 | 0.1831 (7) | 0.9149 (5) | 0.7189 (3) | 0.0544 (12) | |
N4 | 0.0314 (6) | 0.9404 (5) | 0.8478 (3) | 0.0575 (12) | |
N5 | 0.7558 (5) | 0.4797 (5) | 0.8187 (2) | 0.0411 (10) | |
C1 | 0.5416 (8) | 0.6676 (6) | 0.6495 (3) | 0.0511 (14) | |
H1 | 0.5890 | 0.7364 | 0.6658 | 0.061* | |
C2 | 0.5188 (6) | 0.4562 (5) | 0.6178 (3) | 0.0334 (10) | |
C3 | 0.5464 (6) | 0.3083 (5) | 0.5999 (3) | 0.0352 (10) | |
H3 | 0.6568 | 0.2231 | 0.6057 | 0.042* | |
C4 | 0.4050 (6) | 0.2909 (5) | 0.5732 (3) | 0.0375 (11) | |
H4 | 0.4179 | 0.1906 | 0.5595 | 0.045* | |
C5 | 0.2451 (6) | 0.4136 (5) | 0.5654 (3) | 0.0416 (12) | |
H5 | 0.1508 | 0.3949 | 0.5470 | 0.050* | |
C6 | 0.2162 (7) | 0.5628 (6) | 0.5833 (3) | 0.0475 (13) | |
H6 | 0.1060 | 0.6480 | 0.5770 | 0.057* | |
C7 | 0.3565 (7) | 0.5795 (5) | 0.6106 (3) | 0.0382 (11) | |
C8 | 0.2416 (10) | 0.8685 (6) | 0.6319 (4) | 0.0700 (18) | |
H8A | 0.2855 | 0.9397 | 0.6007 | 0.084* | |
H8B | 0.1452 | 0.8743 | 0.6013 | 0.084* | |
C9 | 0.0487 (8) | 0.8983 (6) | 0.7688 (4) | 0.0629 (17) | |
H9 | −0.0264 | 0.8588 | 0.7471 | 0.075* | |
C11 | 0.1667 (7) | 0.9865 (5) | 0.8532 (3) | 0.0416 (12) | |
C12 | 0.2084 (7) | 1.0432 (5) | 0.9234 (3) | 0.0470 (13) | |
H12 | 0.1438 | 1.0529 | 0.9788 | 0.056* | |
C13 | 0.3479 (9) | 1.0850 (7) | 0.9095 (4) | 0.0683 (17) | |
H13 | 0.3776 | 1.1281 | 0.9559 | 0.082* | |
C14 | 0.4463 (10) | 1.0666 (8) | 0.8304 (5) | 0.091 (2) | |
H14 | 0.5443 | 1.0937 | 0.8245 | 0.109* | |
C15 | 0.4059 (9) | 1.0098 (7) | 0.7597 (4) | 0.078 (2) | |
H15 | 0.4722 | 0.9984 | 0.7047 | 0.093* | |
C16 | 0.2652 (8) | 0.9710 (5) | 0.7730 (3) | 0.0497 (14) | |
C17 | 0.8119 (6) | 0.4275 (7) | 0.6628 (3) | 0.0518 (14) | |
H17A | 0.8739 | 0.4932 | 0.6528 | 0.062* | |
H17B | 0.8634 | 0.3453 | 0.6247 | 0.062* | |
C18 | 0.8254 (7) | 0.3596 (6) | 0.7583 (3) | 0.0461 (13) | |
H18A | 0.7636 | 0.2936 | 0.7680 | 0.055* | |
H18B | 0.9444 | 0.2974 | 0.7696 | 0.055* | |
C19 | 0.6381 (6) | 0.4499 (5) | 0.8896 (3) | 0.0348 (10) | |
H19 | 0.6113 | 0.5273 | 0.9302 | 0.042* | |
C20 | 0.4689 (6) | 0.4737 (6) | 0.8519 (3) | 0.0462 (12) | |
H20A | 0.4186 | 0.5761 | 0.8229 | 0.069* | |
H20B | 0.3911 | 0.4610 | 0.8986 | 0.069* | |
H20C | 0.4903 | 0.3989 | 0.8103 | 0.069* | |
C21 | 0.7152 (7) | 0.2931 (6) | 0.9424 (3) | 0.0489 (13) | |
H21A | 0.7476 | 0.2122 | 0.9037 | 0.073* | |
H21B | 0.6313 | 0.2831 | 0.9864 | 0.073* | |
H21C | 0.8153 | 0.2852 | 0.9705 | 0.073* | |
C22 | 0.9092 (11) | 0.5022 (9) | 0.8612 (5) | 0.054 (2) | 0.792 (10) |
H22 | 0.9695 | 0.4146 | 0.9013 | 0.065* | 0.792 (10) |
C22' | 0.843 (2) | 0.582 (2) | 0.8331 (14) | 0.021 (5)* | 0.208 (10) |
H22' | 0.9455 | 0.5571 | 0.8048 | 0.025* | 0.208 (10) |
C23 | 1.0298 (9) | 0.5239 (10) | 0.7878 (5) | 0.098 (2) | |
H23A | 1.1470 | 0.4660 | 0.8038 | 0.118* | |
H23B | 1.0083 | 0.6318 | 0.7774 | 0.118* | |
H23C | 1.0110 | 0.4880 | 0.7353 | 0.118* | |
C24 | 0.8241 (13) | 0.6470 (11) | 0.9089 (6) | 0.090 (3) | 0.792 (10) |
H24A | 0.7210 | 0.7156 | 0.8803 | 0.136* | 0.792 (10) |
H24B | 0.9019 | 0.6974 | 0.9079 | 0.136* | 0.792 (10) |
H24C | 0.7950 | 0.6202 | 0.9687 | 0.136* | 0.792 (10) |
C24' | 0.729 (2) | 0.726 (2) | 0.8681 (14) | 0.022 (5)* | 0.208 (10) |
H24D | 0.6329 | 0.7782 | 0.8312 | 0.034* | 0.208 (10) |
H24E | 0.7908 | 0.7908 | 0.8697 | 0.034* | 0.208 (10) |
H24F | 0.6878 | 0.7052 | 0.9265 | 0.034* | 0.208 (10) |
O1 | 0.968 (2) | 0.133 (2) | 0.5686 (12) | 0.076 (5) | 0.25 |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.0484 (3) | 0.0364 (3) | 0.0800 (4) | −0.0213 (2) | −0.0238 (3) | 0.0042 (2) |
N1 | 0.061 (2) | 0.061 (3) | 0.024 (2) | −0.042 (2) | 0.0074 (18) | −0.0127 (18) |
N2 | 0.093 (3) | 0.030 (2) | 0.028 (2) | −0.025 (2) | −0.002 (2) | −0.0085 (18) |
N3 | 0.097 (4) | 0.031 (2) | 0.030 (2) | −0.017 (2) | −0.011 (2) | −0.0116 (18) |
N4 | 0.054 (3) | 0.050 (3) | 0.068 (3) | −0.015 (2) | −0.003 (2) | −0.027 (2) |
N5 | 0.058 (2) | 0.051 (2) | 0.026 (2) | −0.033 (2) | 0.0081 (18) | −0.0133 (18) |
C1 | 0.097 (4) | 0.051 (3) | 0.026 (3) | −0.050 (3) | 0.006 (3) | −0.011 (2) |
C2 | 0.045 (2) | 0.038 (3) | 0.025 (2) | −0.025 (2) | 0.007 (2) | −0.0089 (19) |
C3 | 0.042 (2) | 0.035 (2) | 0.030 (3) | −0.017 (2) | 0.004 (2) | −0.008 (2) |
C4 | 0.051 (3) | 0.036 (3) | 0.032 (3) | −0.023 (2) | 0.000 (2) | −0.009 (2) |
C5 | 0.041 (3) | 0.044 (3) | 0.041 (3) | −0.016 (2) | −0.002 (2) | −0.012 (2) |
C6 | 0.053 (3) | 0.046 (3) | 0.028 (3) | −0.002 (3) | −0.003 (2) | −0.014 (2) |
C7 | 0.064 (3) | 0.034 (3) | 0.019 (2) | −0.020 (2) | −0.002 (2) | −0.0061 (19) |
C8 | 0.128 (5) | 0.032 (3) | 0.038 (3) | −0.017 (3) | −0.014 (3) | −0.004 (2) |
C9 | 0.057 (3) | 0.048 (3) | 0.077 (5) | −0.006 (3) | −0.009 (3) | −0.032 (3) |
C11 | 0.058 (3) | 0.027 (2) | 0.036 (3) | −0.012 (2) | −0.003 (2) | −0.005 (2) |
C12 | 0.068 (3) | 0.034 (3) | 0.035 (3) | −0.015 (3) | −0.005 (3) | −0.006 (2) |
C13 | 0.100 (5) | 0.065 (4) | 0.055 (4) | −0.042 (4) | 0.002 (3) | −0.033 (3) |
C14 | 0.129 (5) | 0.098 (5) | 0.088 (5) | −0.088 (4) | 0.046 (4) | −0.058 (4) |
C15 | 0.145 (5) | 0.067 (4) | 0.053 (4) | −0.078 (4) | 0.041 (4) | −0.031 (3) |
C16 | 0.097 (4) | 0.027 (3) | 0.031 (3) | −0.029 (3) | −0.004 (3) | −0.009 (2) |
C17 | 0.054 (3) | 0.081 (4) | 0.041 (3) | −0.047 (3) | 0.014 (2) | −0.024 (3) |
C18 | 0.048 (3) | 0.057 (3) | 0.036 (3) | −0.022 (3) | 0.011 (2) | −0.019 (2) |
C19 | 0.038 (2) | 0.040 (3) | 0.026 (2) | −0.014 (2) | 0.0014 (19) | −0.004 (2) |
C20 | 0.047 (3) | 0.060 (3) | 0.036 (3) | −0.025 (3) | −0.002 (2) | −0.002 (2) |
C21 | 0.051 (3) | 0.044 (3) | 0.044 (3) | −0.014 (3) | 0.000 (2) | 0.006 (2) |
C22 | 0.092 (5) | 0.050 (4) | 0.035 (4) | −0.047 (4) | 0.021 (4) | −0.008 (3) |
C23 | 0.076 (4) | 0.142 (6) | 0.109 (6) | −0.067 (5) | −0.014 (4) | −0.037 (5) |
C24 | 0.131 (7) | 0.119 (7) | 0.075 (6) | −0.100 (6) | 0.029 (6) | −0.053 (5) |
O1 | 0.070 (10) | 0.081 (11) | 0.091 (13) | −0.040 (9) | 0.006 (9) | −0.027 (10) |
N1—C1 | 1.332 (6) | C14—C15 | 1.392 (8) |
N1—C2 | 1.399 (5) | C14—H14 | 0.9600 |
N1—C17 | 1.461 (7) | C15—C16 | 1.379 (8) |
N2—C1 | 1.333 (7) | C15—H15 | 0.9600 |
N2—C7 | 1.398 (5) | C17—C18 | 1.522 (7) |
N2—C8 | 1.474 (7) | C17—H17A | 0.9600 |
N3—C9 | 1.367 (7) | C17—H17B | 0.9600 |
N3—C16 | 1.404 (6) | C18—H18A | 0.9600 |
N3—C8 | 1.432 (7) | C18—H18B | 0.9600 |
N4—C9 | 1.296 (7) | C19—C20 | 1.519 (6) |
N4—C11 | 1.399 (6) | C19—C21 | 1.524 (7) |
N5—C18 | 1.450 (6) | C19—H19 | 0.9600 |
N5—C22' | 1.487 (19) | C20—H20A | 0.9599 |
N5—C19 | 1.489 (5) | C20—H20B | 0.9599 |
N5—C22 | 1.608 (8) | C20—H20C | 0.9599 |
C1—H1 | 0.9600 | C21—H21A | 0.9599 |
C2—C3 | 1.382 (6) | C21—H21B | 0.9599 |
C2—C7 | 1.402 (7) | C21—H21C | 0.9599 |
C3—C4 | 1.380 (6) | C22—C23 | 1.504 (9) |
C3—H3 | 0.9600 | C22—C24 | 1.507 (10) |
C4—C5 | 1.387 (6) | C22—H22 | 0.9600 |
C4—H4 | 0.9600 | C22—H22' | 1.045 (6) |
C5—C6 | 1.393 (6) | C22'—C24' | 1.44 (2) |
C5—H5 | 0.9600 | C22'—H22' | 0.889 (17) |
C6—C7 | 1.372 (7) | C23—H22' | 0.693 (7) |
C6—H6 | 0.9600 | C23—H23A | 0.9600 |
C8—H8A | 0.9600 | C23—H23B | 0.9600 |
C8—H8B | 0.9600 | C23—H23C | 0.9600 |
C9—H9 | 0.9600 | C24—H24A | 0.9600 |
C11—C12 | 1.391 (7) | C24—H24B | 0.9600 |
C11—C16 | 1.407 (7) | C24—H24C | 0.9600 |
C12—C13 | 1.387 (8) | C24'—H24D | 0.9600 |
C12—H12 | 0.9600 | C24'—H24E | 0.9600 |
C13—C14 | 1.392 (8) | C24'—H24F | 0.9600 |
C13—H13 | 0.9600 | ||
C1—N1—C2 | 107.8 (4) | C15—C16—N3 | 133.2 (5) |
C1—N1—C17 | 126.4 (4) | C15—C16—C11 | 122.7 (5) |
C2—N1—C17 | 125.6 (4) | N3—C16—C11 | 104.0 (5) |
C1—N2—C7 | 108.1 (4) | N1—C17—C18 | 110.7 (4) |
C1—N2—C8 | 125.8 (5) | N1—C17—H17A | 109.5 |
C7—N2—C8 | 126.1 (5) | C18—C17—H17A | 109.5 |
C9—N3—C16 | 106.5 (4) | N1—C17—H17B | 109.5 |
C9—N3—C8 | 127.1 (5) | C18—C17—H17B | 109.5 |
C16—N3—C8 | 126.1 (5) | H17A—C17—H17B | 108.1 |
C9—N4—C11 | 104.7 (5) | N5—C18—C17 | 111.7 (4) |
C18—N5—C22' | 123.0 (8) | N5—C18—H18A | 109.3 |
C18—N5—C19 | 113.1 (3) | C17—C18—H18A | 109.3 |
C22'—N5—C19 | 119.4 (8) | N5—C18—H18B | 109.3 |
C18—N5—C22 | 110.5 (4) | C17—C18—H18B | 109.3 |
C19—N5—C22 | 109.9 (3) | H18A—C18—H18B | 108.0 |
N1—C1—N2 | 111.1 (4) | N5—C19—C20 | 110.0 (4) |
N1—C1—H1 | 124.5 | N5—C19—C21 | 114.8 (4) |
N2—C1—H1 | 124.5 | C20—C19—C21 | 111.1 (4) |
C3—C2—N1 | 131.3 (4) | N5—C19—H19 | 106.8 |
C3—C2—C7 | 121.9 (4) | C20—C19—H19 | 106.8 |
N1—C2—C7 | 106.8 (4) | C21—C19—H19 | 106.8 |
C4—C3—C2 | 115.7 (4) | C19—C20—H20A | 109.5 |
C4—C3—H3 | 122.1 | C19—C20—H20B | 109.5 |
C2—C3—H3 | 122.1 | H20A—C20—H20B | 109.5 |
C3—C4—C5 | 122.2 (4) | C19—C20—H20C | 109.5 |
C3—C4—H4 | 118.9 | H20A—C20—H20C | 109.5 |
C5—C4—H4 | 118.9 | H20B—C20—H20C | 109.5 |
C4—C5—C6 | 122.4 (4) | C19—C21—H21A | 109.5 |
C4—C5—H5 | 118.8 | C19—C21—H21B | 109.5 |
C6—C5—H5 | 118.8 | H21A—C21—H21B | 109.5 |
C7—C6—C5 | 115.3 (5) | C19—C21—H21C | 109.5 |
C7—C6—H6 | 122.4 | H21A—C21—H21C | 109.5 |
C5—C6—H6 | 122.4 | H21B—C21—H21C | 109.5 |
C6—C7—N2 | 131.2 (5) | C23—C22—C24 | 110.2 (6) |
C6—C7—C2 | 122.5 (4) | C23—C22—N5 | 108.3 (5) |
N2—C7—C2 | 106.3 (4) | C24—C22—N5 | 105.8 (6) |
N3—C8—N2 | 113.0 (4) | C23—C22—H22 | 110.8 |
N3—C8—H8A | 109.0 | C24—C22—H22 | 110.8 |
N2—C8—H8A | 109.0 | N5—C22—H22 | 110.8 |
N3—C8—H8B | 109.0 | C24'—C22'—N5 | 114.1 (14) |
N2—C8—H8B | 109.0 | N5—C22'—H22' | 113.3 (17) |
H8A—C8—H8B | 107.8 | C22—C23—H23A | 109.5 |
N4—C9—N3 | 114.3 (5) | C22—C23—H23B | 109.5 |
N4—C9—H9 | 122.9 | H23A—C23—H23B | 109.5 |
N3—C9—H9 | 122.9 | C22—C23—H23C | 109.5 |
C12—C11—N4 | 129.0 (5) | H23A—C23—H23C | 109.5 |
C12—C11—C16 | 120.5 (5) | H23B—C23—H23C | 109.5 |
N4—C11—C16 | 110.5 (4) | C22—C24—H24A | 109.5 |
C13—C12—C11 | 116.8 (5) | C22—C24—H24B | 109.5 |
C13—C12—H12 | 121.6 | H24A—C24—H24B | 109.5 |
C11—C12—H12 | 121.6 | C22—C24—H24C | 109.5 |
C12—C13—C14 | 122.2 (5) | H24A—C24—H24C | 109.5 |
C12—C13—H13 | 118.9 | H24B—C24—H24C | 109.5 |
C14—C13—H13 | 118.9 | C22'—C24'—H24D | 109.5 |
C13—C14—C15 | 121.5 (6) | C22'—C24'—H24E | 109.5 |
C13—C14—H14 | 119.3 | H24D—C24'—H24E | 109.5 |
C15—C14—H14 | 119.3 | C22'—C24'—H24F | 109.5 |
C16—C15—C14 | 116.3 (5) | H24D—C24'—H24F | 109.5 |
C16—C15—H15 | 121.9 | H24E—C24'—H24F | 109.5 |
C14—C15—H15 | 121.9 | ||
C2—N1—C1—N2 | −0.1 (5) | C11—C12—C13—C14 | −2.2 (9) |
C17—N1—C1—N2 | −175.5 (4) | C12—C13—C14—C15 | 2.3 (11) |
C7—N2—C1—N1 | 0.0 (5) | C13—C14—C15—C16 | −1.0 (10) |
C8—N2—C1—N1 | −179.2 (4) | C14—C15—C16—N3 | 178.3 (6) |
C1—N1—C2—C3 | 178.5 (5) | C14—C15—C16—C11 | −0.2 (9) |
C17—N1—C2—C3 | −6.1 (7) | C9—N3—C16—C15 | −179.9 (6) |
C1—N1—C2—C7 | 0.2 (5) | C8—N3—C16—C15 | 6.3 (9) |
C17—N1—C2—C7 | 175.6 (4) | C9—N3—C16—C11 | −1.1 (5) |
N1—C2—C3—C4 | −176.9 (4) | C8—N3—C16—C11 | −174.9 (5) |
C7—C2—C3—C4 | 1.1 (6) | C12—C11—C16—C15 | 0.2 (8) |
C2—C3—C4—C5 | −0.5 (7) | N4—C11—C16—C15 | 179.3 (5) |
C3—C4—C5—C6 | 0.5 (7) | C12—C11—C16—N3 | −178.7 (4) |
C4—C5—C6—C7 | −1.1 (7) | N4—C11—C16—N3 | 0.4 (5) |
C5—C6—C7—N2 | 177.7 (5) | C1—N1—C17—C18 | 90.7 (5) |
C5—C6—C7—C2 | 1.7 (7) | C2—N1—C17—C18 | −83.9 (5) |
C1—N2—C7—C6 | −176.3 (5) | C22'—N5—C18—C17 | −71.1 (11) |
C8—N2—C7—C6 | 2.9 (8) | C19—N5—C18—C17 | 133.1 (4) |
C1—N2—C7—C2 | 0.1 (5) | C22—N5—C18—C17 | −103.2 (5) |
C8—N2—C7—C2 | 179.4 (4) | N1—C17—C18—N5 | −61.6 (5) |
C3—C2—C7—C6 | −1.8 (7) | C18—N5—C19—C20 | −71.9 (5) |
N1—C2—C7—C6 | 176.7 (4) | C22'—N5—C19—C20 | 131.3 (10) |
C3—C2—C7—N2 | −178.7 (4) | C22—N5—C19—C20 | 164.0 (4) |
N1—C2—C7—N2 | −0.2 (5) | C18—N5—C19—C21 | 54.3 (5) |
C9—N3—C8—N2 | −91.4 (7) | C22'—N5—C19—C21 | −102.6 (10) |
C16—N3—C8—N2 | 81.2 (7) | C22—N5—C19—C21 | −69.8 (5) |
C1—N2—C8—N3 | −74.6 (7) | C18—N5—C22—C23 | 51.6 (7) |
C7—N2—C8—N3 | 106.3 (6) | C22'—N5—C22—C23 | −68.6 (15) |
C11—N4—C9—N3 | −1.3 (6) | C19—N5—C22—C23 | 177.2 (5) |
C16—N3—C9—N4 | 1.6 (7) | C18—N5—C22—C24 | 169.8 (5) |
C8—N3—C9—N4 | 175.3 (5) | C22'—N5—C22—C24 | 49.5 (15) |
C9—N4—C11—C12 | 179.6 (5) | C19—N5—C22—C24 | −64.6 (6) |
C9—N4—C11—C16 | 0.5 (6) | C18—N5—C22'—C24' | 158.1 (13) |
N4—C11—C12—C13 | −178.0 (5) | C19—N5—C22'—C24' | −47.5 (19) |
C16—C11—C12—C13 | 1.0 (7) | C22—N5—C22'—C24' | −127 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···Br1 | 0.96 | 2.75 | 3.493 (7) | 135 |
C6—H6···Br1i | 0.96 | 2.75 | 3.702 (6) | 173 |
C20—H20A···Cg1 | 0.96 | 2.95 | 3.445 (5) | 113 |
Symmetry code: (i) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C23H30N5+·Br−·0.25H2O |
Mr | 460.93 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 153 |
a, b, c (Å) | 8.4944 (17), 9.4960 (19), 15.318 (3) |
α, β, γ (°) | 83.29 (3), 84.69 (3), 65.93 (3) |
V (Å3) | 1119.1 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 1.86 |
Crystal size (mm) | 0.34 × 0.12 × 0.10 |
Data collection | |
Diffractometer | Rigaku Mercury CCD diffractometer |
Absorption correction | Multi-scan (REQAB; Jacobson, 1998) |
Tmin, Tmax | 0.571, 0.836 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7638, 3889, 2390 |
Rint | 0.039 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.054, 0.144, 0.98 |
No. of reflections | 3889 |
No. of parameters | 282 |
No. of restraints | 22 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.74, −0.71 |
Computer programs: CrystalClear (Rigaku/MSC, 2006), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···Br1 | 0.96 | 2.75 | 3.493 (7) | 135 |
C6—H6···Br1i | 0.96 | 2.75 | 3.702 (6) | 173 |
C20—H20A···Cg1 | 0.96 | 2.95 | 3.445 (5) | 113 |
Symmetry code: (i) x−1, y, z. |
Acknowledgements
We thank the İnönü University Research Fund (İÜ BAP: 2008/Güdümlü 3) for financial support.
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.
N-Heterocyclic carbene compounds have been shown to have wide applicability in organometallic chemistry and catalysis such as Suzuki-Miyura, Sonogashira, Stille and Heck reactions (Herrmann et al., 1995; Navarro et al., 2006; Arduengo & Krafczyc, 1998). In general, N-heterocyclic carbene chemistry is dominated by imidazole, diazepin, benzimidazole and their derivatives based carbene ligands.
Microwave-promoted synthesis is an area of increasing interest in both academic and industrial laboratories (Larhed et al., 2002). Microwave heating offers a fast, easy way to perform chemical reactions that require heat. Synthetic organic chemists have taken advantage of microwave heating in their work and found that reaction times can often be reduced from hours to minutes with a significant improvement in yields (Leadbeater & Shoemaker, 2008).
Our team has been interested in complexes of derivatives based on N-heterocyclic carbene compounds which exhibit high catalytic activities for Suzuki-Miyura, and Heck reactions. As a continuation of our systematic studies of the various N-heterocyclic carbene compounds and the catalytic properties of their palladium, ruthenium and rhodium complexes (Yaşar et al., 2008; Arslan et al., 2005, 2007, 2009, and references therein), we have prepared a new carbene compound which includes a benzo[d]imidazole and an amine group. The title compound, (I), synthesis and characterization, including its crystal structure is reported here. The compound was purified by re-crystallizationfrom an ethanol:diethylether mixture (1:2) and characterized by 1H and 13C-NMR. These data are consistent with the proposed structure given in Scheme 1.
The crystallographic asymmetric unit of the title compound contains a single 3-((1H-benzo[d]imidazol-1-yl)methyl)-1-(2-(diisopropylamino)ethyl)-1H-benzo[d]imidazol-3-ium cation, one bromide anion and 0.25 mole water molecule linked by hydrogen and stacking interactions to form a three-dimensional framework. The molecular structure of the title compound is depicted in Fig. 1.
The imidazole and benzimidazole ring systems are essentially planar with maximum deviations of 0.002 (5), 0.008 (5), 0.029 (5) and 0.020 (5) Å for N1—C1—N2—C7—C2, N3—C9—N4—C11—C16, N1—C1—N2—C7—C2—C3—C4—C5—C6 and N3—C9—N4—C11—C12—C13—C14—C15 rings, respectively. The dihedral angle between the benzimidazole rings is 69.51 (8)o. The geometric parameters for the N3—C9—N4—C11—C12—C13—C14—C15 benzimidazole ring agree with the other reported benzimidazole derivatives (Özel Güven et al., 2008a, 2008b, 2008c; Türktekin et al., 2004; Akkurt et al., 2004, 2005, 2007a, 2007b). In particular, in the N—C—N fragments, the C9—N4 bond length (1.295 (8) Å) is ca 0.08 Å shorter than the C9—N3 bond length (1.367 (9) Å), which is consistent with the partial double-bond character. The C—N bond lengths for the other benzimidazole ring are shorter than the average single C—N bond, being N1—C1 = 1.332 (7) Å, N2—C1 = 1.332 (9) Å, N1—C2 = 1.398 (7) Å, and N2—C7 = 1.399 (6) Å thus showing varying degrees of double bond character in these C—N bonds. This information indicates a partial electron delocalization within the C2—N1—C1—N2—C7 fragment. This result is confirmed by the N1—C1—N2 bond angle.
The crystal packing is stabilized mainly by C—H···Br hydrogen bonds and stacking interactions. A partially overlapped arrangement is observed between parallel benzimidazole rings (see Fig. 2) so these parallel benzimidazole rings are linked by π-π stacking interactions. The centroid-centroid separation between the parallel imidazole and benzene ring fragments (N1—C1—N2—C7—C2i and C2—C3—C4—C5—C6—C7i) of the benzimidazole ring is 3.486 (3) Å with C1···C4ii = 3.398 (7) Å [symmetry code: (i) x, y, z, (ii) 1 - x, 1 - y, 1 - z]. In addition, a C—H···π interaction is observed between Cg1 (Centroid of N1—C1—N2—C7—C2 ring) and the C20 atom: H20A···Cg1i = 2.950 Å, C20—H20A···Cg1i = 113.0° [symmetry code: (i) x, y, z].