In the asymmetric unit of the title compound, C
6H
3I
3, there are two independent molecules. The molecules are stacked along the
a axis. The molecular geometry shows evidence of I

I intramolecular steric repulsion.
Supporting information
CCDC reference: 636706
Key indicators
- Single-crystal X-ray study
- T = 223 K
- Mean
(C-C)= 0.007 Å
- R factor = 0.034
- wR factor = 0.086
- Data-to-parameter ratio = 30.7
checkCIF/PLATON results
No syntax errors found
No errors found in this datablock
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997a); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997a); molecular graphics: SHELXTL (Sheldrick, 1997b); software used to prepare material for publication: SHELXTL.
Crystal data top
C6H3I3 | Z = 4 |
Mr = 455.78 | F(000) = 792 |
Triclinic, P1 | Dx = 3.410 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.2439 (5) Å | Cell parameters from 7891 reflections |
b = 10.4665 (7) Å | θ = 2.6–30.0° |
c = 11.7952 (8) Å | µ = 10.48 mm−1 |
α = 90.45 (5)° | T = 223 K |
β = 96.869 (5)° | Plate, colorless |
γ = 90.84 (5)° | 0.30 × 0.18 × 0.10 mm |
V = 887.74 (10) Å3 | |
Data collection top
Bruker SMART CCD area detector diffractometer | 5119 independent reflections |
Radiation source: fine-focus sealed tube | 4554 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.040 |
ω scans | θmax = 30.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→10 |
Tmin = 0.120, Tmax = 0.349 | k = −14→14 |
13551 measured reflections | l = −16→16 |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.034 | H-atom parameters constrained |
wR(F2) = 0.086 | w = 1/[σ2(Fo2) + (0.0467P)2 + 0.5033P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max = 0.001 |
5119 reflections | Δρmax = 1.10 e Å−3 |
167 parameters | Δρmin = −1.13 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: 0.00151 (17) |
Special details top
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. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
I1 | 0.64920 (5) | 0.72362 (3) | −0.08999 (3) | 0.04346 (10) | |
I2 | 0.72769 (4) | 0.98243 (3) | 0.11419 (3) | 0.03702 (9) | |
I3 | 1.17283 (5) | 0.98908 (3) | 0.29385 (3) | 0.04151 (9) | |
C1 | 0.9060 (6) | 0.7559 (4) | 0.0098 (4) | 0.0322 (8) | |
C2 | 0.9354 (6) | 0.8502 (4) | 0.0940 (3) | 0.0285 (8) | |
C3 | 1.1068 (6) | 0.8562 (4) | 0.1617 (4) | 0.0307 (8) | |
C4 | 1.2465 (6) | 0.7698 (5) | 0.1438 (4) | 0.0375 (9) | |
H4 | 1.3623 | 0.7751 | 0.1891 | 0.045* | |
C5 | 1.2150 (7) | 0.6777 (5) | 0.0603 (5) | 0.0410 (10) | |
H5 | 1.3085 | 0.6192 | 0.0495 | 0.049* | |
C6 | 1.0448 (7) | 0.6704 (4) | −0.0083 (4) | 0.0382 (10) | |
H6 | 1.0239 | 0.6081 | −0.0664 | 0.046* | |
I4 | 0.76538 (5) | 0.24251 (3) | 0.34303 (3) | 0.04907 (10) | |
I5 | 0.71569 (5) | 0.56257 (3) | 0.23095 (2) | 0.04069 (9) | |
I6 | 0.69954 (6) | 0.81772 (3) | 0.43319 (3) | 0.04732 (10) | |
C7 | 0.7574 (6) | 0.4029 (4) | 0.4486 (4) | 0.0307 (8) | |
C8 | 0.7354 (6) | 0.5270 (4) | 0.4055 (3) | 0.0299 (8) | |
C9 | 0.7304 (6) | 0.6277 (4) | 0.4839 (4) | 0.0297 (8) | |
C10 | 0.7458 (6) | 0.6058 (5) | 0.6005 (4) | 0.0347 (9) | |
H10 | 0.7397 | 0.6743 | 0.6519 | 0.042* | |
C11 | 0.7700 (6) | 0.4837 (5) | 0.6405 (4) | 0.0364 (9) | |
H11 | 0.7831 | 0.4692 | 0.7196 | 0.044* | |
C12 | 0.7754 (6) | 0.3814 (4) | 0.5659 (4) | 0.0347 (9) | |
H12 | 0.7911 | 0.2981 | 0.5941 | 0.042* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
I1 | 0.04006 (17) | 0.0545 (2) | 0.03477 (16) | −0.00491 (14) | 0.00163 (12) | −0.01109 (13) |
I2 | 0.03662 (16) | 0.03594 (15) | 0.03730 (16) | 0.01214 (11) | −0.00175 (11) | −0.00320 (11) |
I3 | 0.04194 (18) | 0.03199 (15) | 0.04728 (18) | 0.00100 (12) | −0.00800 (13) | −0.00511 (12) |
C1 | 0.035 (2) | 0.034 (2) | 0.0286 (19) | 0.0018 (16) | 0.0082 (16) | −0.0006 (16) |
C2 | 0.0291 (19) | 0.0266 (18) | 0.0298 (19) | 0.0030 (15) | 0.0035 (15) | 0.0009 (15) |
C3 | 0.029 (2) | 0.0265 (18) | 0.036 (2) | 0.0008 (15) | 0.0021 (16) | 0.0021 (15) |
C4 | 0.030 (2) | 0.039 (2) | 0.043 (2) | 0.0076 (17) | 0.0027 (18) | 0.0048 (19) |
C5 | 0.038 (2) | 0.037 (2) | 0.050 (3) | 0.0075 (19) | 0.014 (2) | 0.003 (2) |
C6 | 0.046 (3) | 0.032 (2) | 0.039 (2) | 0.0017 (18) | 0.0147 (19) | −0.0040 (18) |
I4 | 0.0513 (2) | 0.03937 (18) | 0.0535 (2) | 0.00964 (14) | −0.00597 (15) | −0.01474 (15) |
I5 | 0.04512 (18) | 0.05194 (19) | 0.02464 (13) | 0.00657 (14) | 0.00213 (11) | −0.00211 (12) |
I6 | 0.0661 (2) | 0.03354 (16) | 0.04039 (17) | 0.00140 (14) | −0.00176 (15) | 0.00075 (12) |
C7 | 0.0235 (18) | 0.037 (2) | 0.0305 (19) | 0.0017 (15) | −0.0010 (14) | −0.0039 (16) |
C8 | 0.0235 (18) | 0.039 (2) | 0.0259 (18) | 0.0011 (15) | −0.0010 (14) | −0.0020 (15) |
C9 | 0.0272 (19) | 0.0304 (19) | 0.0306 (19) | 0.0012 (15) | −0.0004 (15) | −0.0002 (15) |
C10 | 0.034 (2) | 0.042 (2) | 0.0287 (19) | 0.0023 (18) | 0.0052 (16) | −0.0041 (17) |
C11 | 0.032 (2) | 0.050 (3) | 0.0268 (19) | 0.0005 (18) | 0.0026 (16) | 0.0050 (18) |
C12 | 0.032 (2) | 0.036 (2) | 0.036 (2) | 0.0028 (17) | 0.0021 (17) | 0.0046 (17) |
Geometric parameters (Å, º) top
I1—C1 | 2.101 (5) | I4—C7 | 2.088 (4) |
I2—C2 | 2.092 (4) | I5—C8 | 2.083 (4) |
I3—C3 | 2.089 (4) | I6—C9 | 2.088 (4) |
C1—C6 | 1.390 (6) | C7—C12 | 1.394 (6) |
C1—C2 | 1.390 (6) | C7—C8 | 1.403 (6) |
C2—C3 | 1.394 (6) | C8—C9 | 1.401 (6) |
C3—C4 | 1.400 (6) | C9—C10 | 1.388 (6) |
C4—C5 | 1.370 (7) | C10—C11 | 1.372 (7) |
C4—H4 | 0.9400 | C10—H10 | 0.9400 |
C5—C6 | 1.392 (7) | C11—C12 | 1.384 (7) |
C5—H5 | 0.9400 | C11—H11 | 0.9400 |
C6—H6 | 0.9400 | C12—H12 | 0.9400 |
| | | |
C6—C1—C2 | 121.1 (4) | C12—C7—C8 | 120.8 (4) |
C6—C1—I1 | 115.4 (3) | C12—C7—I4 | 116.7 (3) |
C2—C1—I1 | 123.4 (3) | C8—C7—I4 | 122.5 (3) |
C1—C2—C3 | 118.5 (4) | C9—C8—C7 | 117.8 (4) |
C1—C2—I2 | 120.1 (3) | C9—C8—I5 | 120.5 (3) |
C3—C2—I2 | 121.3 (3) | C7—C8—I5 | 121.6 (3) |
C2—C3—C4 | 120.4 (4) | C10—C9—C8 | 121.2 (4) |
C2—C3—I3 | 123.6 (3) | C10—C9—I6 | 116.3 (3) |
C4—C3—I3 | 116.0 (3) | C8—C9—I6 | 122.4 (3) |
C5—C4—C3 | 120.2 (4) | C11—C10—C9 | 119.7 (4) |
C5—C4—H4 | 119.9 | C11—C10—H10 | 120.1 |
C3—C4—H4 | 119.9 | C9—C10—H10 | 120.1 |
C4—C5—C6 | 120.2 (4) | C10—C11—C12 | 120.8 (4) |
C4—C5—H5 | 119.8 | C10—C11—H11 | 119.6 |
C6—C5—H5 | 120.0 | C12—C11—H11 | 119.6 |
C1—C6—C5 | 119.5 (4) | C11—C12—C7 | 119.6 (4) |
C1—C6—H6 | 120.2 | C11—C12—H12 | 120.2 |
C5—C6—H6 | 120.2 | C7—C12—H12 | 120.2 |
Average molecular geometries (Å, °) of some iodobenzenes topMolecule | C—I | C—C—C | I···I |
iodobenzene | 2.09 (1) | 121 (1) | none |
1,3,5-triiodobenzene | 2.095 (5) | 121.7 (6) | none |
1,2,3-triiodobenzene | 2.09 (1) | 118.0 (4) | 3.60 (2) |
hexaiodobenzene | 2.09 (4) | 119.8 (8) | 3.51 (1) |
C—C—C and I···I correspond to the endocyclic angles
at carbons with vicinal iodines and
non-bonding intermolecular distances, respectively. |