Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807044169/bt2504sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807044169/bt2504Isup2.hkl |
CCDC reference: 663757
The title compound arose from the attempted methylation (with MeI) of 3-(2-pyridine)-pyrazole hydrochloride. Orange blocks of (I) were recoverd from the reaction. Their composition could not be determined on the basis of spectroscopic measurements and the single-crystal study was performed to identify the title compound. The mechanism of formation of (I) requires further investigation.
The N-bound H atom was located in a difference map and its position were freely refined with Uiso(H) = 1.2Ueq(N).
The C-bound H atoms were placed geometrically (C—H = 0.93–0.96 Å) and refined as riding with Uiso(H) = 1.2Ueq(carrier) or 1.5Ueq(methyl C). The methyl group was allowed to rotate, but not to tip, to best fit the electron density.
The title compound, (I), is a molecular salt (Fig. 1), with normal geometrical parameters for the organic component (Allen et al., 1995). The dihedral angle betwen the N1/C1—C5 and N2/N3/C6—C8 rings in the cation is 14.9 (2)°. The C1—N1—C5 bond angle of 124.2 (4)° is typically expanded due to the protonation of N1 (Wang et al., 1999).
The two I—Cl bond lengths (Table 1) in the ICl2- anion in (I) are significantly different, by some 0.149 (2) Å. Sometimes (Wang et al., 1999) the two bond lengths in the ICl2- anion are constrained to be the same by symmetry. However, in C4H12N2·(ICl2)2, the difference between the two bonds of 0.22 Å (Romming, 1958) is even greater than seen here. In all cases, the Cl—I—Cl bond angle is close to linear, in accordance with the predictions of VSEPR or qualitative MO theory (Greenwood & Earnshaw, 1997).
In the crystal, the components interact by way of an intra/intermolecular bifurcated N—H···(N,Cl) hydrogen bond (Table 2). A weak C—H···Cl contact also occurs. The separation of I1 and Cl1ii (ii = x, 1/2 - y, z - 1/2) of 3.5275 (13) Å is some 0.2 Å less than the van der Waals separation of I and Cl of 3.73 Å. If this is considered to be a bonding interaction, [001] chains of ion-pairs are the result (Fig. 2).
For background, see: Romming (1958); Greenwood & Earnshaw (1997); Wang et al. (1999). For reference structural data, see: Allen et al. (1995).
Data collection: SMART (Bruker, 1999); cell refinement: SAINT (Bruker, 1999); data reduction: SAINT (Bruker, 1999); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 1997).
C9H9IN3+·Cl2I− | F(000) = 896 |
Mr = 483.89 | Dx = 2.241 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 5028 reflections |
a = 8.4261 (4) Å | θ = 2.5–25.0° |
b = 8.0183 (4) Å | µ = 4.74 mm−1 |
c = 21.4692 (10) Å | T = 293 K |
β = 98.604 (1)° | Block, orange |
V = 1434.20 (12) Å3 | 0.29 × 0.19 × 0.12 mm |
Z = 4 |
Bruker SMART 1000 CCD diffractometer | 2523 independent reflections |
Radiation source: fine-focus sealed tube | 2256 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
ω scans | θmax = 25.0°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 1999) | h = −10→9 |
Tmin = 0.340, Tmax = 0.601 | k = −7→9 |
8399 measured reflections | l = −25→25 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: difmap and geom |
R[F2 > 2σ(F2)] = 0.027 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.069 | w = 1/[σ2(Fo2) + (0.0376P)2 + 1.477P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max = 0.002 |
2523 reflections | Δρmax = 1.35 e Å−3 |
150 parameters | Δρmin = −1.15 e Å−3 |
0 restraints | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0015 (2) |
C9H9IN3+·Cl2I− | V = 1434.20 (12) Å3 |
Mr = 483.89 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.4261 (4) Å | µ = 4.74 mm−1 |
b = 8.0183 (4) Å | T = 293 K |
c = 21.4692 (10) Å | 0.29 × 0.19 × 0.12 mm |
β = 98.604 (1)° |
Bruker SMART 1000 CCD diffractometer | 2523 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1999) | 2256 reflections with I > 2σ(I) |
Tmin = 0.340, Tmax = 0.601 | Rint = 0.029 |
8399 measured reflections |
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.069 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 1.35 e Å−3 |
2523 reflections | Δρmin = −1.15 e Å−3 |
150 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 | 0.3644 (5) | 0.1154 (6) | 0.6860 (2) | 0.0506 (11) | |
H1A | 0.3397 | 0.0788 | 0.7246 | 0.061* | |
C2 | 0.2569 (6) | 0.0942 (7) | 0.6326 (2) | 0.0626 (13) | |
H2 | 0.1585 | 0.0429 | 0.6339 | 0.075* | |
C3 | 0.2985 (6) | 0.1513 (8) | 0.5760 (2) | 0.0641 (14) | |
H3 | 0.2264 | 0.1396 | 0.5390 | 0.077* | |
C4 | 0.4438 (6) | 0.2244 (6) | 0.5744 (2) | 0.0526 (11) | |
H4 | 0.4704 | 0.2620 | 0.5363 | 0.063* | |
C5 | 0.5527 (5) | 0.2428 (5) | 0.62949 (19) | 0.0361 (8) | |
C6 | 0.7118 (5) | 0.3184 (5) | 0.63513 (18) | 0.0362 (8) | |
C7 | 0.8107 (5) | 0.3601 (5) | 0.59068 (18) | 0.0401 (9) | |
C8 | 0.9446 (5) | 0.4287 (5) | 0.6250 (2) | 0.0444 (10) | |
H8 | 1.0336 | 0.4701 | 0.6091 | 0.053* | |
C9 | 1.0300 (6) | 0.4922 (8) | 0.7394 (2) | 0.0732 (17) | |
H9A | 1.0087 | 0.4379 | 0.7771 | 0.110* | |
H9B | 1.0117 | 0.6099 | 0.7426 | 0.110* | |
H9C | 1.1395 | 0.4730 | 0.7340 | 0.110* | |
N1 | 0.5052 (4) | 0.1889 (4) | 0.68311 (17) | 0.0395 (8) | |
H1 | 0.570 (6) | 0.193 (6) | 0.713 (2) | 0.047* | |
N2 | 0.7823 (4) | 0.3587 (4) | 0.69377 (15) | 0.0396 (8) | |
N3 | 0.9241 (4) | 0.4256 (5) | 0.68572 (16) | 0.0437 (8) | |
I1 | 0.77668 (4) | 0.33639 (5) | 0.493422 (14) | 0.06943 (16) | |
I2 | 0.37423 (3) | 0.26801 (3) | 0.869408 (12) | 0.04377 (12) | |
Cl1 | 0.62989 (15) | 0.1392 (2) | 0.83096 (6) | 0.0648 (3) | |
Cl2 | 0.13126 (16) | 0.3839 (2) | 0.90614 (6) | 0.0740 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.045 (2) | 0.060 (3) | 0.049 (3) | −0.008 (2) | 0.017 (2) | −0.002 (2) |
C2 | 0.041 (2) | 0.082 (4) | 0.065 (3) | −0.024 (2) | 0.008 (2) | −0.010 (3) |
C3 | 0.049 (3) | 0.092 (4) | 0.048 (3) | −0.012 (3) | −0.002 (2) | −0.006 (3) |
C4 | 0.050 (3) | 0.070 (3) | 0.036 (2) | −0.012 (2) | 0.002 (2) | 0.002 (2) |
C5 | 0.040 (2) | 0.035 (2) | 0.033 (2) | −0.0018 (16) | 0.0070 (16) | −0.0017 (16) |
C6 | 0.041 (2) | 0.0326 (19) | 0.035 (2) | −0.0001 (16) | 0.0065 (17) | 0.0037 (16) |
C7 | 0.044 (2) | 0.047 (2) | 0.030 (2) | −0.0020 (18) | 0.0090 (17) | 0.0002 (17) |
C8 | 0.042 (2) | 0.050 (2) | 0.044 (2) | −0.0015 (19) | 0.0155 (18) | 0.0034 (19) |
C9 | 0.056 (3) | 0.112 (5) | 0.048 (3) | −0.034 (3) | −0.006 (2) | −0.004 (3) |
N1 | 0.0387 (19) | 0.0448 (19) | 0.0348 (18) | −0.0024 (15) | 0.0047 (14) | 0.0016 (15) |
N2 | 0.0344 (17) | 0.051 (2) | 0.0330 (17) | −0.0054 (15) | 0.0022 (14) | 0.0047 (15) |
N3 | 0.0359 (17) | 0.055 (2) | 0.0395 (19) | −0.0069 (16) | 0.0026 (14) | 0.0007 (16) |
I1 | 0.0779 (3) | 0.0981 (3) | 0.03559 (19) | −0.0296 (2) | 0.01929 (16) | −0.00920 (16) |
I2 | 0.04535 (18) | 0.04520 (18) | 0.03920 (18) | −0.00216 (12) | 0.00128 (12) | 0.00301 (11) |
Cl1 | 0.0531 (6) | 0.0988 (10) | 0.0434 (6) | 0.0133 (6) | 0.0107 (5) | 0.0076 (6) |
Cl2 | 0.0652 (8) | 0.0984 (10) | 0.0581 (8) | 0.0316 (8) | 0.0079 (6) | −0.0003 (7) |
C1—N1 | 1.334 (6) | C7—C8 | 1.367 (6) |
C1—C2 | 1.361 (7) | C7—I1 | 2.073 (4) |
C1—H1A | 0.9300 | C8—N3 | 1.341 (5) |
C2—C3 | 1.391 (7) | C8—H8 | 0.9300 |
C2—H2 | 0.9300 | C9—N3 | 1.449 (6) |
C3—C4 | 1.363 (7) | C9—H9A | 0.9600 |
C3—H3 | 0.9300 | C9—H9B | 0.9600 |
C4—C5 | 1.392 (6) | C9—H9C | 0.9600 |
C4—H4 | 0.9300 | N1—H1 | 0.78 (5) |
C5—N1 | 1.346 (5) | N2—N3 | 1.345 (4) |
C5—C6 | 1.460 (6) | I2—Cl2 | 2.4819 (13) |
C6—N2 | 1.348 (5) | I2—Cl1 | 2.6308 (13) |
C6—C7 | 1.398 (5) | ||
N1—C1—C2 | 120.0 (4) | C8—C7—I1 | 123.9 (3) |
N1—C1—H1A | 120.0 | C6—C7—I1 | 131.2 (3) |
C2—C1—H1A | 120.0 | N3—C8—C7 | 107.5 (4) |
C1—C2—C3 | 118.1 (4) | N3—C8—H8 | 126.2 |
C1—C2—H2 | 120.9 | C7—C8—H8 | 126.2 |
C3—C2—H2 | 120.9 | N3—C9—H9A | 109.5 |
C4—C3—C2 | 120.6 (4) | N3—C9—H9B | 109.5 |
C4—C3—H3 | 119.7 | H9A—C9—H9B | 109.5 |
C2—C3—H3 | 119.7 | N3—C9—H9C | 109.5 |
C3—C4—C5 | 120.3 (4) | H9A—C9—H9C | 109.5 |
C3—C4—H4 | 119.9 | H9B—C9—H9C | 109.5 |
C5—C4—H4 | 119.9 | C1—N1—C5 | 124.2 (4) |
N1—C5—C4 | 116.8 (4) | C1—N1—H1 | 120 (4) |
N1—C5—C6 | 116.7 (4) | C5—N1—H1 | 116 (4) |
C4—C5—C6 | 126.5 (4) | N3—N2—C6 | 104.6 (3) |
N2—C6—C7 | 110.8 (3) | C8—N3—N2 | 112.2 (3) |
N2—C6—C5 | 116.6 (3) | C8—N3—C9 | 127.8 (4) |
C7—C6—C5 | 132.6 (4) | N2—N3—C9 | 119.9 (4) |
C8—C7—C6 | 104.8 (3) | Cl2—I2—Cl1 | 178.86 (5) |
N1—C1—C2—C3 | −0.2 (8) | C5—C6—C7—I1 | 0.9 (7) |
C1—C2—C3—C4 | 0.9 (9) | C6—C7—C8—N3 | 0.4 (5) |
C2—C3—C4—C5 | −0.1 (8) | I1—C7—C8—N3 | 179.1 (3) |
C3—C4—C5—N1 | −1.4 (7) | C2—C1—N1—C5 | −1.4 (7) |
C3—C4—C5—C6 | −179.8 (5) | C4—C5—N1—C1 | 2.1 (6) |
N1—C5—C6—N2 | −13.3 (5) | C6—C5—N1—C1 | −179.3 (4) |
C4—C5—C6—N2 | 165.1 (4) | C7—C6—N2—N3 | 0.2 (4) |
N1—C5—C6—C7 | 166.8 (4) | C5—C6—N2—N3 | −179.7 (3) |
C4—C5—C6—C7 | −14.7 (7) | C7—C8—N3—N2 | −0.3 (5) |
N2—C6—C7—C8 | −0.4 (5) | C7—C8—N3—C9 | −176.6 (5) |
C5—C6—C7—C8 | 179.4 (4) | C6—N2—N3—C8 | 0.1 (5) |
N2—C6—C7—I1 | −179.0 (3) | C6—N2—N3—C9 | 176.7 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···N2 | 0.78 (5) | 2.32 (5) | 2.683 (5) | 109 (4) |
N1—H1···Cl1 | 0.78 (5) | 2.54 (5) | 3.216 (4) | 146 (5) |
C2—H2···Cl2i | 0.93 | 2.77 | 3.664 (5) | 160 |
Symmetry code: (i) −x, y−1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C9H9IN3+·Cl2I− |
Mr | 483.89 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 8.4261 (4), 8.0183 (4), 21.4692 (10) |
β (°) | 98.604 (1) |
V (Å3) | 1434.20 (12) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 4.74 |
Crystal size (mm) | 0.29 × 0.19 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 1999) |
Tmin, Tmax | 0.340, 0.601 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8399, 2523, 2256 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.069, 1.04 |
No. of reflections | 2523 |
No. of parameters | 150 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 1.35, −1.15 |
Computer programs: SMART (Bruker, 1999), SAINT (Bruker, 1999), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), ORTEP-3 (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···N2 | 0.78 (5) | 2.32 (5) | 2.683 (5) | 109 (4) |
N1—H1···Cl1 | 0.78 (5) | 2.54 (5) | 3.216 (4) | 146 (5) |
C2—H2···Cl2i | 0.93 | 2.77 | 3.664 (5) | 160 |
Symmetry code: (i) −x, y−1/2, −z+3/2. |
The title compound, (I), is a molecular salt (Fig. 1), with normal geometrical parameters for the organic component (Allen et al., 1995). The dihedral angle betwen the N1/C1—C5 and N2/N3/C6—C8 rings in the cation is 14.9 (2)°. The C1—N1—C5 bond angle of 124.2 (4)° is typically expanded due to the protonation of N1 (Wang et al., 1999).
The two I—Cl bond lengths (Table 1) in the ICl2- anion in (I) are significantly different, by some 0.149 (2) Å. Sometimes (Wang et al., 1999) the two bond lengths in the ICl2- anion are constrained to be the same by symmetry. However, in C4H12N2·(ICl2)2, the difference between the two bonds of 0.22 Å (Romming, 1958) is even greater than seen here. In all cases, the Cl—I—Cl bond angle is close to linear, in accordance with the predictions of VSEPR or qualitative MO theory (Greenwood & Earnshaw, 1997).
In the crystal, the components interact by way of an intra/intermolecular bifurcated N—H···(N,Cl) hydrogen bond (Table 2). A weak C—H···Cl contact also occurs. The separation of I1 and Cl1ii (ii = x, 1/2 - y, z - 1/2) of 3.5275 (13) Å is some 0.2 Å less than the van der Waals separation of I and Cl of 3.73 Å. If this is considered to be a bonding interaction, [001] chains of ion-pairs are the result (Fig. 2).