organic compounds
1-(2-Cyanoethyl)-2-(2-pyridyl)-1H,3H-benzimidazol-3-ium perchlorate
aKey Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China, and bTeaching and Research Department, Urumqi Command College, The Chinese People's Armed Police Forces, Urumqi 830049, People's Republic of China
*Correspondence e-mail: liuws@lzu.edu.cn
The title compound, C15H13N4+·ClO4−, comprises a nonplanar 1-(2-cyanoethyl)-2-(2-pyridyl)-1H,3H-benzimidazol-3-ium cation [dihedral angle between the imidazole and pyridine rings = 22.5 (8)°] and a perchlorate anion. The cation is formed by protonation of the N atom of the benzimidazole ring. A charged N—H⋯O hydrogen bond connects the anion and cation, and intermolecular C—H⋯O and C—H⋯N interactions contribute to the crystal packing.
Related literature
For the pharmacological activity of benzimidazole and its derivatives, see: Feng & Xu (2001); Ferey (2001); Hossain et al. (2001); Howarth & Hanlon (2001); Kazak et al. (2006); Li et al. (1998).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1997); cell SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536809055251/kp2242sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809055251/kp2242Isup2.hkl
The ligand, 1-(cyanoethyl)-2-(2-pyridyl)benzimidazole was prepared according to the method described by Hossain et al. (2001), using 2-(2-pyridyl)benzimidazole and acrylonitrile as starting materials (yield: 62%, m.p. 378–383 K).
Single crystals of the title compound suitable for X-ray analysis were obtained by slow evaporation of a methanol solution (6 ml) containing Fe(ClO4)3.10H2O (26.7 mg, 0.05 mmol) and 1-(cyanoethyl)-2-(2-pyridyl)benzimidazole (24.8 mg, 0.10 mmol) after two weeks at room temperature. Our attempt to obtain an iron(III) perchlorate complex of the ligand failed and, instead, the protonated ligand salt was crystallised.
The position of the amine H atom was refined freely, together with its individual isotropic displacement parameter. All other H atoms were positioned geometrically with C—H = 0.93 and 0.97 Å for aromatic, methylene H atoms, respectively, and constrained to ride on their parent atoms with Uiso(H) = 1.2Ueq(C).
For many years benzimidazole and its derivatives continue to attract attention in chemical synthesis, structural science and applied biological research due to their various pharmacological activities (Li et al., 1998; Howarth & Hanlon, 2001; Feng & Xu, 2001; Ferey, 2001; Kazak et al., 2006). Like the phenanthroline based ligands these compounds are known to chelate metal atoms although their coordination chemistry has not been as extensively explored. To further widen the scope of research on the chemical and physical properties of benzimidazole derivatives, there is a need to prepare a new series of benzimidazole derivatives. In this paper, we present the structure of the title compound as a perchlorate salt.
The compound is composed of C15H13N4+ cation and a perchlorate anion, in a 1:1 ratio (Fig. 1). In C15H13N4+ cation, the molecular skeleton of protonated 2-(2-pyridyl)benzimidazole is non-planar and the dihedral angle between benzimidazole ring and pyridine ring is 25.46°. Two of O atoms of the perchlorate anion, link benzimidazole via the charged N(2)–H(5)···O(4) and C(11)–H(11)···O(3) hydrogen bonds (Table 1). In addition, intermolecular C–H···O, N–H···O hydrogen bonds and π···π interactions between benzimidazole groups [Cg···Cgi plane···plane separation = 3.6933 (16) Å, i = 1 - x, 1 - y, 1 - z] link the molecules into a three-dimensional structure (Fig. 2).
For the pharmacological activity of benzimidazole and its derivatives, see: Feng & Xu (2001); Ferey (2001); Hossain et al. (2001); Howarth & Hanlon (2001); Kazak et al. (2006); Li et al. (1998).
Data collection: SMART (Bruker, 1997); cell
SAINT (Bruker, 1997); data reduction: SAINT (Bruker, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. Molecular structure of the title compound. Displacement ellipsoids are drawn at the 30% probability level. | |
Fig. 2. The three-dimensional packing diagram of the compound. Hydrogen bonds are shown as turquiose dashed lines. H atoms not involved in hydrogen bonding have been omitted for clarity. The π···π interaction between benzimidazole groups are shown as light blue dashed lines. |
C15H13N4+·ClO4− | Z = 2 |
Mr = 348.74 | F(000) = 360 |
Triclinic, P1 | Dx = 1.460 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.788 (1) Å | Cell parameters from 1758 reflections |
b = 9.4608 (10) Å | θ = 2.4–26.4° |
c = 10.6013 (11) Å | µ = 0.27 mm−1 |
α = 69.690 (2)° | T = 296 K |
β = 73.844 (2)° | Block, yellow |
γ = 86.193 (2)° | 0.22 × 0.21 × 0.19 mm |
V = 793.52 (15) Å3 |
Bruker SMART CCD area-detector diffractometer | 2924 independent reflections |
Radiation source: fine-focus sealed tube | 2316 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.013 |
phi and ω scans | θmax = 25.5°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Bruker, 1997) | h = −10→10 |
Tmin = 0.940, Tmax = 0.955 | k = −11→6 |
4167 measured reflections | l = −12→12 |
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)] = 0.047 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.122 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | w = 1/[σ2(Fo2) + (0.043P)2 + 0.670P] where P = (Fo2 + 2Fc2)/3 |
2924 reflections | (Δ/σ)max < 0.001 |
221 parameters | Δρmax = 0.35 e Å−3 |
102 restraints | Δρmin = −0.24 e Å−3 |
C15H13N4+·ClO4− | γ = 86.193 (2)° |
Mr = 348.74 | V = 793.52 (15) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.788 (1) Å | Mo Kα radiation |
b = 9.4608 (10) Å | µ = 0.27 mm−1 |
c = 10.6013 (11) Å | T = 296 K |
α = 69.690 (2)° | 0.22 × 0.21 × 0.19 mm |
β = 73.844 (2)° |
Bruker SMART CCD area-detector diffractometer | 2924 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1997) | 2316 reflections with I > 2σ(I) |
Tmin = 0.940, Tmax = 0.955 | Rint = 0.013 |
4167 measured reflections |
R[F2 > 2σ(F2)] = 0.047 | 102 restraints |
wR(F2) = 0.122 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | Δρmax = 0.35 e Å−3 |
2924 reflections | Δρmin = −0.24 e Å−3 |
221 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 | 0.1586 (4) | −0.0845 (4) | 0.8393 (4) | 0.0755 (9) | |
H1 | 0.1941 | −0.1600 | 0.9072 | 0.091* | |
C2 | 0.0604 (4) | −0.1248 (4) | 0.7774 (4) | 0.0781 (10) | |
H2 | 0.0314 | −0.2256 | 0.8016 | 0.094* | |
C3 | 0.0053 (4) | −0.0148 (4) | 0.6792 (4) | 0.0797 (10) | |
H3 | −0.0635 | −0.0396 | 0.6369 | 0.096* | |
C4 | 0.0524 (4) | 0.1333 (4) | 0.6431 (3) | 0.0657 (8) | |
H4 | 0.0168 | 0.2102 | 0.5762 | 0.079* | |
C5 | 0.1544 (3) | 0.1638 (3) | 0.7097 (3) | 0.0469 (6) | |
C6 | 0.2150 (3) | 0.3172 (3) | 0.6751 (2) | 0.0409 (6) | |
C7 | 0.3245 (3) | 0.5180 (3) | 0.6825 (2) | 0.0402 (5) | |
C8 | 0.3956 (3) | 0.6193 (3) | 0.7178 (3) | 0.0493 (6) | |
H8 | 0.4122 | 0.5949 | 0.8057 | 0.059* | |
C9 | 0.4403 (4) | 0.7580 (3) | 0.6163 (3) | 0.0578 (7) | |
H9 | 0.4903 | 0.8288 | 0.6354 | 0.069* | |
C10 | 0.4127 (4) | 0.7952 (3) | 0.4854 (3) | 0.0582 (7) | |
H10 | 0.4437 | 0.8908 | 0.4199 | 0.070* | |
C11 | 0.3412 (3) | 0.6949 (3) | 0.4506 (3) | 0.0516 (7) | |
H11 | 0.3223 | 0.7203 | 0.3634 | 0.062* | |
C12 | 0.2988 (3) | 0.5544 (3) | 0.5516 (2) | 0.0410 (6) | |
C13 | 0.2574 (3) | 0.2959 (3) | 0.9067 (2) | 0.0437 (6) | |
H13A | 0.1756 | 0.2165 | 0.9481 | 0.052* | |
H13B | 0.2286 | 0.3688 | 0.9542 | 0.052* | |
C14 | 0.4152 (3) | 0.2296 (3) | 0.9245 (3) | 0.0522 (7) | |
H14A | 0.4470 | 0.1621 | 0.8715 | 0.063* | |
H14B | 0.4953 | 0.3102 | 0.8880 | 0.063* | |
C15 | 0.4052 (4) | 0.1470 (3) | 1.0716 (3) | 0.0591 (7) | |
Cl1 | 0.17292 (8) | 0.51237 (8) | 0.19213 (6) | 0.0485 (2) | |
H5 | 0.207 (3) | 0.416 (3) | 0.491 (3) | 0.044 (8)* | |
N1 | 0.2065 (3) | 0.0574 (3) | 0.8078 (3) | 0.0601 (6) | |
N2 | 0.2311 (3) | 0.4263 (2) | 0.5520 (2) | 0.0449 (5) | |
N3 | 0.2685 (2) | 0.3697 (2) | 0.75719 (19) | 0.0399 (5) | |
N4 | 0.3982 (4) | 0.0807 (4) | 1.1839 (3) | 0.0887 (10) | |
O1 | 0.0518 (3) | 0.5091 (3) | 0.1302 (3) | 0.0896 (8) | |
O2 | 0.3196 (3) | 0.4965 (3) | 0.1030 (3) | 0.0923 (8) | |
O3 | 0.1764 (4) | 0.6462 (4) | 0.2192 (4) | 0.1268 (12) | |
O4 | 0.1453 (4) | 0.3906 (4) | 0.3209 (3) | 0.1253 (12) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.087 (2) | 0.0490 (17) | 0.080 (2) | −0.0088 (16) | −0.0136 (18) | −0.0141 (16) |
C2 | 0.085 (2) | 0.0587 (19) | 0.081 (2) | −0.0247 (17) | 0.0083 (18) | −0.0317 (17) |
C3 | 0.084 (2) | 0.088 (2) | 0.075 (2) | −0.0308 (19) | −0.0067 (18) | −0.0423 (19) |
C4 | 0.0707 (19) | 0.073 (2) | 0.0575 (18) | −0.0127 (16) | −0.0179 (15) | −0.0236 (15) |
C5 | 0.0466 (14) | 0.0479 (14) | 0.0454 (14) | −0.0034 (11) | −0.0045 (11) | −0.0204 (12) |
C6 | 0.0433 (14) | 0.0456 (14) | 0.0349 (13) | 0.0033 (11) | −0.0098 (10) | −0.0159 (11) |
C7 | 0.0443 (13) | 0.0380 (13) | 0.0352 (13) | 0.0049 (10) | −0.0098 (10) | −0.0102 (10) |
C8 | 0.0652 (17) | 0.0459 (15) | 0.0422 (14) | 0.0035 (12) | −0.0224 (13) | −0.0159 (12) |
C9 | 0.0699 (19) | 0.0453 (16) | 0.0621 (18) | −0.0032 (13) | −0.0218 (15) | −0.0192 (14) |
C10 | 0.0704 (19) | 0.0397 (15) | 0.0507 (16) | −0.0021 (13) | −0.0122 (14) | −0.0012 (12) |
C11 | 0.0604 (17) | 0.0511 (16) | 0.0360 (13) | 0.0034 (13) | −0.0134 (12) | −0.0061 (12) |
C12 | 0.0418 (13) | 0.0454 (14) | 0.0354 (13) | 0.0038 (11) | −0.0104 (10) | −0.0139 (11) |
C13 | 0.0563 (15) | 0.0430 (14) | 0.0286 (12) | 0.0020 (11) | −0.0118 (11) | −0.0084 (10) |
C14 | 0.0564 (16) | 0.0528 (16) | 0.0418 (14) | −0.0002 (13) | −0.0165 (12) | −0.0065 (12) |
C15 | 0.0691 (19) | 0.0531 (17) | 0.0565 (18) | 0.0111 (14) | −0.0295 (15) | −0.0124 (14) |
Cl1 | 0.0493 (4) | 0.0606 (4) | 0.0450 (4) | −0.0011 (3) | −0.0169 (3) | −0.0257 (3) |
N1 | 0.0657 (15) | 0.0470 (13) | 0.0656 (15) | −0.0028 (11) | −0.0196 (12) | −0.0149 (12) |
N2 | 0.0534 (13) | 0.0508 (13) | 0.0340 (11) | 0.0001 (10) | −0.0164 (10) | −0.0152 (10) |
N3 | 0.0491 (12) | 0.0382 (11) | 0.0309 (10) | 0.0014 (9) | −0.0115 (9) | −0.0096 (9) |
N4 | 0.108 (2) | 0.093 (2) | 0.0539 (17) | 0.0245 (18) | −0.0388 (16) | −0.0032 (16) |
O1 | 0.0684 (15) | 0.122 (2) | 0.1015 (18) | 0.0124 (14) | −0.0503 (14) | −0.0474 (16) |
O2 | 0.0586 (14) | 0.138 (2) | 0.0961 (18) | 0.0062 (14) | −0.0112 (13) | −0.0667 (17) |
O3 | 0.139 (3) | 0.116 (2) | 0.172 (3) | 0.0001 (19) | −0.041 (2) | −0.108 (2) |
O4 | 0.173 (3) | 0.129 (2) | 0.0615 (16) | −0.058 (2) | −0.0465 (18) | 0.0051 (16) |
C1—N1 | 1.333 (4) | C9—H9 | 0.9300 |
C1—C2 | 1.361 (5) | C10—C11 | 1.373 (4) |
C1—H1 | 0.9300 | C10—H10 | 0.9300 |
C2—C3 | 1.365 (5) | C11—C12 | 1.382 (3) |
C2—H2 | 0.9300 | C11—H11 | 0.9300 |
C3—C4 | 1.377 (4) | C12—N2 | 1.382 (3) |
C3—H3 | 0.9300 | C13—N3 | 1.471 (3) |
C4—C5 | 1.384 (4) | C13—C14 | 1.517 (4) |
C4—H4 | 0.9300 | C13—H13A | 0.9700 |
C5—N1 | 1.335 (3) | C13—H13B | 0.9700 |
C5—C6 | 1.465 (3) | C14—C15 | 1.462 (4) |
C6—N2 | 1.330 (3) | C14—H14A | 0.9700 |
C6—N3 | 1.336 (3) | C14—H14B | 0.9700 |
C7—C8 | 1.381 (3) | C15—N4 | 1.123 (4) |
C7—C12 | 1.389 (3) | Cl1—O3 | 1.396 (3) |
C7—N3 | 1.393 (3) | Cl1—O1 | 1.404 (2) |
C8—C9 | 1.374 (4) | Cl1—O2 | 1.404 (2) |
C8—H8 | 0.9300 | Cl1—O4 | 1.418 (3) |
C9—C10 | 1.395 (4) | N2—H5 | 0.78 (3) |
N1—C1—C2 | 123.6 (3) | C10—C11—H11 | 121.7 |
N1—C1—H1 | 118.2 | C12—C11—H11 | 121.7 |
C2—C1—H1 | 118.2 | C11—C12—N2 | 132.5 (2) |
C1—C2—C3 | 118.8 (3) | C11—C12—C7 | 121.5 (2) |
C1—C2—H2 | 120.6 | N2—C12—C7 | 106.0 (2) |
C3—C2—H2 | 120.6 | N3—C13—C14 | 109.9 (2) |
C2—C3—C4 | 119.5 (3) | N3—C13—H13A | 109.7 |
C2—C3—H3 | 120.2 | C14—C13—H13A | 109.7 |
C4—C3—H3 | 120.2 | N3—C13—H13B | 109.7 |
C3—C4—C5 | 117.8 (3) | C14—C13—H13B | 109.7 |
C3—C4—H4 | 121.1 | H13A—C13—H13B | 108.2 |
C5—C4—H4 | 121.1 | C15—C14—C13 | 111.2 (2) |
N1—C5—C4 | 123.1 (3) | C15—C14—H14A | 109.4 |
N1—C5—C6 | 115.2 (2) | C13—C14—H14A | 109.4 |
C4—C5—C6 | 121.7 (3) | C15—C14—H14B | 109.4 |
N2—C6—N3 | 108.6 (2) | C13—C14—H14B | 109.4 |
N2—C6—C5 | 124.6 (2) | H14A—C14—H14B | 108.0 |
N3—C6—C5 | 126.7 (2) | N4—C15—C14 | 178.5 (3) |
C8—C7—C12 | 121.9 (2) | O3—Cl1—O1 | 111.91 (19) |
C8—C7—N3 | 131.6 (2) | O3—Cl1—O2 | 109.33 (18) |
C12—C7—N3 | 106.5 (2) | O1—Cl1—O2 | 109.27 (15) |
C9—C8—C7 | 116.5 (2) | O3—Cl1—O4 | 108.3 (2) |
C9—C8—H8 | 121.8 | O1—Cl1—O4 | 108.51 (17) |
C7—C8—H8 | 121.8 | O2—Cl1—O4 | 109.5 (2) |
C8—C9—C10 | 121.7 (3) | C1—N1—C5 | 117.2 (3) |
C8—C9—H9 | 119.2 | C6—N2—C12 | 110.0 (2) |
C10—C9—H9 | 119.2 | C6—N2—H5 | 123 (2) |
C11—C10—C9 | 121.9 (2) | C12—N2—H5 | 127 (2) |
C11—C10—H10 | 119.1 | C6—N3—C7 | 108.90 (19) |
C9—C10—H10 | 119.1 | C6—N3—C13 | 127.9 (2) |
C10—C11—C12 | 116.6 (2) | C7—N3—C13 | 122.87 (19) |
N1—C1—C2—C3 | −1.0 (5) | N3—C13—C14—C15 | −176.3 (2) |
C1—C2—C3—C4 | 1.3 (5) | C13—C14—C15—N4 | 118 (13) |
C2—C3—C4—C5 | −0.3 (5) | C2—C1—N1—C5 | −0.2 (5) |
C3—C4—C5—N1 | −1.1 (4) | C4—C5—N1—C1 | 1.3 (4) |
C3—C4—C5—C6 | 178.0 (3) | C6—C5—N1—C1 | −177.8 (3) |
N1—C5—C6—N2 | 152.9 (2) | N3—C6—N2—C12 | 0.7 (3) |
C4—C5—C6—N2 | −26.3 (4) | C5—C6—N2—C12 | −176.9 (2) |
N1—C5—C6—N3 | −24.3 (4) | C11—C12—N2—C6 | 179.1 (3) |
C4—C5—C6—N3 | 156.6 (3) | C7—C12—N2—C6 | 0.2 (3) |
C12—C7—C8—C9 | −0.3 (4) | N2—C6—N3—C7 | −1.3 (3) |
N3—C7—C8—C9 | 178.5 (3) | C5—C6—N3—C7 | 176.3 (2) |
C7—C8—C9—C10 | 1.1 (4) | N2—C6—N3—C13 | 172.2 (2) |
C8—C9—C10—C11 | −0.8 (5) | C5—C6—N3—C13 | −10.3 (4) |
C9—C10—C11—C12 | −0.4 (4) | C8—C7—N3—C6 | −177.6 (3) |
C10—C11—C12—N2 | −177.5 (3) | C12—C7—N3—C6 | 1.4 (3) |
C10—C11—C12—C7 | 1.3 (4) | C8—C7—N3—C13 | 8.6 (4) |
C8—C7—C12—C11 | −0.9 (4) | C12—C7—N3—C13 | −172.5 (2) |
N3—C7—C12—C11 | 180.0 (2) | C14—C13—N3—C6 | 102.0 (3) |
C8—C7—C12—N2 | 178.1 (2) | C14—C13—N3—C7 | −85.3 (3) |
N3—C7—C12—N2 | −1.0 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H5···O4 | 0.77 (3) | 2.11 (3) | 2.885 (4) | 179 (4) |
C11—H11···O3 | 0.93 | 2.54 | 3.343 (5) | 145 |
C4—H4···O4 | 0.93 | 2.62 | 3.347 (4) | 135 |
C13—H13A···N1 | 0.97 | 2.41 | 2.903 (4) | 111 |
C10—H10···N4i | 0.93 | 2.64 | 3.423 (4) | 142 |
C13—H13B···O2ii | 0.97 | 2.60 | 3.427 (4) | 144 |
C14—H14B···O2iii | 0.97 | 2.57 | 3.483 (4) | 157 |
C2—H2···O1iv | 0.93 | 2.62 | 3.552 (4) | 180 |
Symmetry codes: (i) x, y+1, z−1; (ii) x, y, z+1; (iii) −x+1, −y+1, −z+1; (iv) −x, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C15H13N4+·ClO4− |
Mr | 348.74 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 8.788 (1), 9.4608 (10), 10.6013 (11) |
α, β, γ (°) | 69.690 (2), 73.844 (2), 86.193 (2) |
V (Å3) | 793.52 (15) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.22 × 0.21 × 0.19 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 1997) |
Tmin, Tmax | 0.940, 0.955 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4167, 2924, 2316 |
Rint | 0.013 |
(sin θ/λ)max (Å−1) | 0.606 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.047, 0.122, 1.01 |
No. of reflections | 2924 |
No. of parameters | 221 |
No. of restraints | 102 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.35, −0.24 |
Computer programs: SMART (Bruker, 1997), SAINT (Bruker, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H5···O4 | 0.77 (3) | 2.11 (3) | 2.885 (4) | 179 (4) |
C11—H11···O3 | 0.930 | 2.540 | 3.343 (5) | 145.00 |
C4—H4···O4 | 0.930 | 2.619 | 3.347 (4) | 135.44 |
C13—H13A···N1 | 0.970 | 2.410 | 2.903 (4) | 111.00 |
C10—H10···N4i | 0.930 | 2.644 | 3.423 (4) | 141.72 |
C13—H13B···O2ii | 0.970 | 2.600 | 3.427 (4) | 144.00 |
C14—H14B···O2iii | 0.970 | 2.570 | 3.483 (4) | 157.00 |
C2—H2···O1iv | 0.930 | 2.621 | 3.552 (4) | 179.70 |
Symmetry codes: (i) x, y+1, z−1; (ii) x, y, z+1; (iii) −x+1, −y+1, −z+1; (iv) −x, −y, −z+1. |
Acknowledgements
The authors thank the National Natural Science Foundation of China (20771048, 20931003, 20621091, J0730425) for financial support.
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For many years benzimidazole and its derivatives continue to attract attention in chemical synthesis, structural science and applied biological research due to their various pharmacological activities (Li et al., 1998; Howarth & Hanlon, 2001; Feng & Xu, 2001; Ferey, 2001; Kazak et al., 2006). Like the phenanthroline based ligands these compounds are known to chelate metal atoms although their coordination chemistry has not been as extensively explored. To further widen the scope of research on the chemical and physical properties of benzimidazole derivatives, there is a need to prepare a new series of benzimidazole derivatives. In this paper, we present the structure of the title compound as a perchlorate salt.
The compound is composed of C15H13N4+ cation and a perchlorate anion, in a 1:1 ratio (Fig. 1). In C15H13N4+ cation, the molecular skeleton of protonated 2-(2-pyridyl)benzimidazole is non-planar and the dihedral angle between benzimidazole ring and pyridine ring is 25.46°. Two of O atoms of the perchlorate anion, link benzimidazole via the charged N(2)–H(5)···O(4) and C(11)–H(11)···O(3) hydrogen bonds (Table 1). In addition, intermolecular C–H···O, N–H···O hydrogen bonds and π···π interactions between benzimidazole groups [Cg···Cgi plane···plane separation = 3.6933 (16) Å, i = 1 - x, 1 - y, 1 - z] link the molecules into a three-dimensional structure (Fig. 2).