organic compounds
2,2′-Bipyrimidine-1,1′-diium bis(triiodide)–2,2′-bipyrimidine–water (1/2/2)
aSchool of Applied Chemical Engineering, The Research Institute of Catalysis, Chonnam National University, Gwangju 500-757, Republic of Korea
*Correspondence e-mail: hakwang@chonnam.ac.kr
In the crystal of the title compound, C8H8N42+·2I3−·2C8H6N4·2H2O, inversion centres are located at the centroids of the central C—C bonds of the cation and the bpym molecules, as well as at the central I atoms of both anions. Intermolecular O—H⋯N and N—H⋯O hydrogen bonds are observed in the crystal structure.
Related literature
For related structures, see: Fialho De Assis et al. (1996); Kochel (2005). For the synthesis and of [Mn(C8H6N4)3](I3)2·CH3NO2, see: Ha (2011).
Experimental
Crystal data
|
Refinement
|
Data collection: SMART (Bruker, 2000); cell SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536811034982/im2310sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811034982/im2310Isup2.hkl
The title compound was unexpectedly obtained as a byproduct from the reaction of MnI2 (0.3086 g, 1.000 mmol) with 2,2'-bipyrimidine (0.1588 g, 1.004 mmol) in acetone (30 ml). After stirring of the reaction mixture for 3 h at room temperature and addition of pentane (30 ml), the formed precipitate was separated by filtration, washed with EtOH and ether, to give a brown powder (0.3621 g) (Ha, 2011). Single crystals of the title compound suitable for X-ray analysis were obtained by slow evaporation from the brown filtrate.
H atoms at nitrogen were observed in the Fourier maps but were nevertheless as H atoms at carbon positioned geometrically and allowed to ride on their respective parent atoms [C—H = 0.95 Å (CH) or 0.88 Å (NH) and Uiso(H) = 1.2Ueq(C, N)]. The H atoms of the solvent water molecules were located from the difference Fourier map then allowed to ride on their parent O atoms in the final cycles of
with O—H = 0.84 Å and Uiso(H) = 1.5 Ueq(O). The highest peak (1.29 e Å-3) and the deepest hole (-1.67 e Å-3) in the difference Fourier map are located 1.38 Å and 0.93 Å from the atoms I2 and I1, respectively.The title compound, (C8H8N4)2+(I3-)2.2C8H6N4 × 2 H2O, consists of a diprotonated 2,2'-bipyrimidinium cation, two discrete I3- anions, two 2,2'-bipyrimidine (bpym) and two water solvent molecules (Fig. 1). Single crystals of the compound were unexpectedly obtained as a byproduct from the reaction of MnI2 with 2,2'-bipyrimidine (Ha, 2011), and the structure is related to that of the compounds (C8H8N4)[ReCl6].2H2O (Kochel, 2005) and (C10H9N2)(I3) (Fialho De Assis et al., 1996).
The π-π interactions between pyrimidine rings, with a shortest ring centroid-centroid distance of 5.239 (6) Å.
contains one half of the formula unit. Inversion centres are located at the centroids of the central carbon carbon bond of the cation and the bpym molecules. Therefore the two pyrimidine rings in each moiety are exactly parallel. The central I atoms (I1 and I3) of the anions also occupy crystallographic inversion centres: the anions are linear and the I—I distances are almost equal. Intermolecular O—H···N and N—H···O hydrogen bonds stabilize the and the cation reveals short intramolecular N—H···N hydrogen bonds (Fig. 2 and Table 1). Moreover, there are weak intermolecularFor related structures, see: Fialho De Assis et al. (1996); Kochel (2005). For the synthesis and
of [Mn(C8H6N4)3](I3)2.CH3NO2, see: Ha (2011).Data collection: SMART (Bruker, 2000); cell
SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C8H8N42+·2I3−·2C8H6N4·2H2O | Z = 1 |
Mr = 1273.95 | F(000) = 586 |
Triclinic, P1 | Dx = 2.321 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.964 (2) Å | Cell parameters from 3632 reflections |
b = 9.013 (2) Å | θ = 2.4–25.9° |
c = 12.112 (3) Å | µ = 5.15 mm−1 |
α = 77.265 (5)° | T = 200 K |
β = 76.881 (5)° | Block, redbrown |
γ = 76.287 (4)° | 0.35 × 0.21 × 0.16 mm |
V = 911.3 (4) Å3 |
Bruker SMART 1000 CCD diffractometer | 3505 independent reflections |
Radiation source: fine-focus sealed tube | 2993 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.018 |
φ and ω scans | θmax = 26.0°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −10→11 |
Tmin = 0.769, Tmax = 1.000 | k = −11→11 |
5688 measured reflections | l = −13→14 |
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)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.132 | H-atom parameters constrained |
S = 1.31 | w = 1/[σ2(Fo2) + (0.0114P)2 + 14.2699P] where P = (Fo2 + 2Fc2)/3 |
3505 reflections | (Δ/σ)max < 0.001 |
202 parameters | Δρmax = 1.29 e Å−3 |
0 restraints | Δρmin = −1.67 e Å−3 |
C8H8N42+·2I3−·2C8H6N4·2H2O | γ = 76.287 (4)° |
Mr = 1273.95 | V = 911.3 (4) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.964 (2) Å | Mo Kα radiation |
b = 9.013 (2) Å | µ = 5.15 mm−1 |
c = 12.112 (3) Å | T = 200 K |
α = 77.265 (5)° | 0.35 × 0.21 × 0.16 mm |
β = 76.881 (5)° |
Bruker SMART 1000 CCD diffractometer | 3505 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 2993 reflections with I > 2σ(I) |
Tmin = 0.769, Tmax = 1.000 | Rint = 0.018 |
5688 measured reflections |
R[F2 > 2σ(F2)] = 0.053 | 0 restraints |
wR(F2) = 0.132 | H-atom parameters constrained |
S = 1.31 | w = 1/[σ2(Fo2) + (0.0114P)2 + 14.2699P] where P = (Fo2 + 2Fc2)/3 |
3505 reflections | Δρmax = 1.29 e Å−3 |
202 parameters | Δρmin = −1.67 e Å−3 |
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 | ||
I1 | 1.0000 | 0.0000 | 0.0000 | 0.0408 (3) | |
I2 | 0.74916 (11) | 0.26620 (10) | 0.03957 (9) | 0.0590 (3) | |
I3 | 0.0000 | 0.5000 | 0.5000 | 0.0465 (3) | |
I4 | 0.11198 (10) | 0.59729 (11) | 0.67614 (7) | 0.0543 (3) | |
N1 | 0.3970 (10) | 0.1722 (10) | −0.0778 (7) | 0.0340 (19) | |
H1N | 0.4476 | 0.1641 | −0.1482 | 0.041* | |
N2 | 0.3607 (9) | 0.0652 (9) | 0.1209 (7) | 0.0281 (18) | |
N3 | 0.4427 (9) | 0.6152 (9) | 0.3680 (7) | 0.0273 (17) | |
N4 | 0.4734 (10) | 0.3448 (10) | 0.4394 (7) | 0.0324 (19) | |
N5 | 0.1907 (9) | 0.0208 (9) | 0.5125 (7) | 0.0293 (18) | |
N6 | −0.0604 (10) | 0.0811 (10) | 0.6308 (7) | 0.0327 (19) | |
C1 | 0.2819 (12) | 0.2904 (12) | −0.0578 (9) | 0.033 (2) | |
H1 | 0.2550 | 0.3689 | −0.1207 | 0.040* | |
C2 | 0.1989 (12) | 0.3036 (12) | 0.0521 (9) | 0.035 (2) | |
H2 | 0.1168 | 0.3895 | 0.0664 | 0.042* | |
C3 | 0.2421 (12) | 0.1847 (12) | 0.1401 (9) | 0.035 (2) | |
H3 | 0.1859 | 0.1880 | 0.2165 | 0.042* | |
C4 | 0.4339 (11) | 0.0663 (11) | 0.0113 (9) | 0.028 (2) | |
C5 | 0.4007 (12) | 0.5968 (13) | 0.2747 (8) | 0.033 (2) | |
H5 | 0.3729 | 0.6850 | 0.2184 | 0.039* | |
C6 | 0.3968 (13) | 0.4517 (14) | 0.2580 (9) | 0.041 (3) | |
H6 | 0.3698 | 0.4370 | 0.1903 | 0.049* | |
C7 | 0.4334 (14) | 0.3302 (13) | 0.3431 (10) | 0.042 (3) | |
H7 | 0.4303 | 0.2292 | 0.3335 | 0.051* | |
C8 | 0.4744 (11) | 0.4879 (11) | 0.4473 (8) | 0.026 (2) | |
C9 | 0.2583 (12) | 0.0653 (12) | 0.5860 (9) | 0.035 (2) | |
H9 | 0.3679 | 0.0607 | 0.5701 | 0.042* | |
C10 | 0.1691 (12) | 0.1169 (12) | 0.6831 (8) | 0.033 (2) | |
H10 | 0.2159 | 0.1437 | 0.7371 | 0.040* | |
C11 | 0.0077 (13) | 0.1291 (13) | 0.7005 (8) | 0.035 (2) | |
H11 | −0.0562 | 0.1729 | 0.7641 | 0.043* | |
C12 | 0.0361 (12) | 0.0280 (11) | 0.5389 (8) | 0.029 (2) | |
O1 | 0.5739 (8) | 0.0741 (8) | 0.6568 (6) | 0.0321 (16) | |
H1A | 0.5705 | 0.1700 | 0.6472 | 0.048* | |
H1B | 0.6249 | 0.0175 | 0.7061 | 0.048* |
U11 | U22 | U33 | U12 | U13 | U23 | |
I1 | 0.0539 (7) | 0.0402 (6) | 0.0341 (5) | −0.0204 (5) | −0.0139 (5) | −0.0004 (4) |
I2 | 0.0621 (6) | 0.0466 (5) | 0.0748 (7) | −0.0098 (4) | −0.0217 (5) | −0.0159 (4) |
I3 | 0.0351 (6) | 0.0436 (6) | 0.0406 (6) | 0.0054 (4) | 0.0029 (4) | 0.0102 (5) |
I4 | 0.0437 (5) | 0.0571 (5) | 0.0466 (5) | 0.0078 (4) | −0.0030 (4) | −0.0018 (4) |
N1 | 0.035 (5) | 0.032 (5) | 0.031 (5) | −0.003 (4) | −0.007 (4) | 0.001 (4) |
N2 | 0.029 (4) | 0.028 (4) | 0.023 (4) | −0.006 (3) | −0.002 (3) | 0.002 (3) |
N3 | 0.022 (4) | 0.030 (4) | 0.027 (4) | 0.000 (3) | −0.005 (3) | −0.005 (3) |
N4 | 0.041 (5) | 0.026 (4) | 0.033 (5) | −0.005 (4) | −0.013 (4) | −0.008 (4) |
N5 | 0.024 (4) | 0.027 (4) | 0.031 (4) | −0.004 (3) | −0.004 (3) | 0.005 (3) |
N6 | 0.027 (4) | 0.043 (5) | 0.023 (4) | −0.007 (4) | −0.006 (3) | 0.006 (4) |
C1 | 0.038 (6) | 0.027 (5) | 0.030 (5) | −0.008 (4) | −0.014 (4) | 0.013 (4) |
C2 | 0.033 (5) | 0.026 (5) | 0.043 (6) | 0.001 (4) | −0.009 (5) | −0.005 (4) |
C3 | 0.035 (6) | 0.034 (6) | 0.036 (6) | −0.011 (5) | −0.001 (4) | −0.009 (5) |
C4 | 0.027 (5) | 0.027 (5) | 0.034 (5) | −0.012 (4) | −0.013 (4) | 0.001 (4) |
C5 | 0.036 (6) | 0.042 (6) | 0.024 (5) | −0.013 (5) | −0.013 (4) | 0.000 (4) |
C6 | 0.044 (7) | 0.054 (7) | 0.030 (6) | −0.013 (5) | −0.009 (5) | −0.015 (5) |
C7 | 0.050 (7) | 0.035 (6) | 0.046 (7) | −0.016 (5) | −0.009 (5) | −0.008 (5) |
C8 | 0.027 (5) | 0.025 (5) | 0.022 (5) | −0.004 (4) | −0.005 (4) | 0.000 (4) |
C9 | 0.031 (5) | 0.042 (6) | 0.037 (6) | −0.010 (5) | −0.019 (5) | 0.002 (5) |
C10 | 0.038 (6) | 0.044 (6) | 0.021 (5) | −0.013 (5) | −0.013 (4) | 0.001 (4) |
C11 | 0.040 (6) | 0.050 (7) | 0.016 (5) | −0.001 (5) | −0.009 (4) | −0.010 (4) |
C12 | 0.042 (6) | 0.025 (5) | 0.016 (4) | −0.010 (4) | −0.009 (4) | 0.009 (4) |
O1 | 0.042 (4) | 0.028 (4) | 0.025 (4) | −0.010 (3) | −0.011 (3) | 0.004 (3) |
I1—I2 | 2.9158 (10) | C2—C3 | 1.386 (15) |
I1—I2i | 2.9158 (10) | C2—H2 | 0.9500 |
I3—I4 | 2.9226 (11) | C3—H3 | 0.9500 |
I3—I4ii | 2.9226 (11) | C4—C4iii | 1.49 (2) |
N1—C1 | 1.319 (13) | C5—C6 | 1.376 (15) |
N1—C4 | 1.320 (12) | C5—H5 | 0.9500 |
N1—H1N | 0.8800 | C6—C7 | 1.363 (16) |
N2—C4 | 1.339 (13) | C6—H6 | 0.9500 |
N2—C3 | 1.342 (13) | C7—H7 | 0.9500 |
N3—C5 | 1.324 (12) | C8—C8iv | 1.525 (18) |
N3—C8 | 1.342 (12) | C9—C10 | 1.370 (15) |
N4—C8 | 1.316 (12) | C9—H9 | 0.9500 |
N4—C7 | 1.336 (14) | C10—C11 | 1.395 (15) |
N5—C12 | 1.339 (13) | C10—H10 | 0.9500 |
N5—C9 | 1.355 (13) | C11—H11 | 0.9500 |
N6—C11 | 1.339 (13) | C12—C12v | 1.484 (19) |
N6—C12 | 1.348 (13) | O1—H1A | 0.8400 |
C1—C2 | 1.385 (15) | O1—H1B | 0.8400 |
C1—H1 | 0.9500 | ||
I2—I1—I2i | 180.00 (3) | C6—C5—H5 | 119.5 |
I4—I3—I4ii | 180.0 | C7—C6—C5 | 116.9 (10) |
C1—N1—C4 | 117.8 (9) | C7—C6—H6 | 121.5 |
C1—N1—H1N | 121.1 | C5—C6—H6 | 121.5 |
C4—N1—H1N | 121.1 | N4—C7—C6 | 123.8 (10) |
C4—N2—C3 | 116.1 (8) | N4—C7—H7 | 118.1 |
C5—N3—C8 | 117.3 (9) | C6—C7—H7 | 118.1 |
C8—N4—C7 | 114.8 (9) | N4—C8—N3 | 126.2 (9) |
C12—N5—C9 | 117.8 (9) | N4—C8—C8iv | 117.6 (10) |
C11—N6—C12 | 115.7 (9) | N3—C8—C8iv | 116.1 (10) |
N1—C1—C2 | 121.9 (9) | N5—C9—C10 | 120.3 (9) |
N1—C1—H1 | 119.0 | N5—C9—H9 | 119.9 |
C2—C1—H1 | 119.0 | C10—C9—H9 | 119.9 |
C1—C2—C3 | 116.5 (10) | C9—C10—C11 | 118.1 (9) |
C1—C2—H2 | 121.8 | C9—C10—H10 | 121.0 |
C3—C2—H2 | 121.8 | C11—C10—H10 | 121.0 |
N2—C3—C2 | 122.0 (10) | N6—C11—C10 | 122.3 (9) |
N2—C3—H3 | 119.0 | N6—C11—H11 | 118.9 |
C2—C3—H3 | 119.0 | C10—C11—H11 | 118.9 |
N1—C4—N2 | 125.6 (9) | N5—C12—N6 | 125.6 (9) |
N1—C4—C4iii | 117.7 (11) | N5—C12—C12v | 117.6 (11) |
N2—C4—C4iii | 116.6 (10) | N6—C12—C12v | 116.8 (11) |
N3—C5—C6 | 120.9 (10) | H1A—O1—H1B | 116.6 |
N3—C5—H5 | 119.5 | ||
C4—N1—C1—C2 | −1.3 (15) | C7—N4—C8—N3 | −1.5 (15) |
N1—C1—C2—C3 | −0.8 (16) | C7—N4—C8—C8iv | −177.5 (11) |
C4—N2—C3—C2 | −0.8 (14) | C5—N3—C8—N4 | 2.7 (15) |
C1—C2—C3—N2 | 1.8 (16) | C5—N3—C8—C8iv | 178.8 (10) |
C1—N1—C4—N2 | 2.5 (15) | C12—N5—C9—C10 | −0.5 (14) |
C1—N1—C4—C4iii | −179.0 (10) | N5—C9—C10—C11 | −3.0 (15) |
C3—N2—C4—N1 | −1.5 (14) | C12—N6—C11—C10 | −3.5 (15) |
C3—N2—C4—C4iii | −179.9 (10) | C9—C10—C11—N6 | 5.2 (16) |
C8—N3—C5—C6 | −2.8 (15) | C9—N5—C12—N6 | 2.4 (14) |
N3—C5—C6—C7 | 1.9 (16) | C9—N5—C12—C12v | −177.1 (10) |
C8—N4—C7—C6 | 0.4 (16) | C11—N6—C12—N5 | −0.4 (14) |
C5—C6—C7—N4 | −0.6 (18) | C11—N6—C12—C12v | 179.1 (10) |
Symmetry codes: (i) −x+2, −y, −z; (ii) −x, −y+1, −z+1; (iii) −x+1, −y, −z; (iv) −x+1, −y+1, −z+1; (v) −x, −y, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1A···N3iv | 0.84 | 1.88 | 2.721 (11) | 178 |
O1—H1B···N2vi | 0.84 | 2.09 | 2.837 (10) | 149 |
N1—H1N···O1vii | 0.88 | 2.59 | 3.450 (11) | 166 |
Symmetry codes: (iv) −x+1, −y+1, −z+1; (vi) −x+1, −y, −z+1; (vii) x, y, z−1. |
Experimental details
Crystal data | |
Chemical formula | C8H8N42+·2I3−·2C8H6N4·2H2O |
Mr | 1273.95 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 200 |
a, b, c (Å) | 8.964 (2), 9.013 (2), 12.112 (3) |
α, β, γ (°) | 77.265 (5), 76.881 (5), 76.287 (4) |
V (Å3) | 911.3 (4) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 5.15 |
Crystal size (mm) | 0.35 × 0.21 × 0.16 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.769, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5688, 3505, 2993 |
Rint | 0.018 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.053, 0.132, 1.31 |
No. of reflections | 3505 |
No. of parameters | 202 |
H-atom treatment | H-atom parameters constrained |
w = 1/[σ2(Fo2) + (0.0114P)2 + 14.2699P] where P = (Fo2 + 2Fc2)/3 | |
Δρmax, Δρmin (e Å−3) | 1.29, −1.67 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1A···N3i | 0.84 | 1.88 | 2.721 (11) | 177.6 |
O1—H1B···N2ii | 0.84 | 2.09 | 2.837 (10) | 148.6 |
N1—H1N···O1iii | 0.88 | 2.59 | 3.450 (11) | 165.6 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y, −z+1; (iii) x, y, z−1. |
Acknowledgements
This work was supported by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010–0029626).
References
Bruker (2000). SADABS, SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
Fialho De Assis, E., Howie, R. A. & Wardell, J. L. (1996). Acta Cryst. C52, 955–957. CSD CrossRef CAS IUCr Journals Google Scholar
Ha, K. (2011). Z. Kristallogr. New Cryst. Struct. 226, 365–367. CAS Google Scholar
Kochel, A. (2005). Acta Cryst. E61, m759–m760. Web of Science CSD CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
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, (C8H8N4)2+(I3-)2.2C8H6N4 × 2 H2O, consists of a diprotonated 2,2'-bipyrimidinium cation, two discrete I3- anions, two 2,2'-bipyrimidine (bpym) and two water solvent molecules (Fig. 1). Single crystals of the compound were unexpectedly obtained as a byproduct from the reaction of MnI2 with 2,2'-bipyrimidine (Ha, 2011), and the structure is related to that of the compounds (C8H8N4)[ReCl6].2H2O (Kochel, 2005) and (C10H9N2)(I3) (Fialho De Assis et al., 1996).
The asymmetric unit contains one half of the formula unit. Inversion centres are located at the centroids of the central carbon carbon bond of the cation and the bpym molecules. Therefore the two pyrimidine rings in each moiety are exactly parallel. The central I atoms (I1 and I3) of the anions also occupy crystallographic inversion centres: the anions are linear and the I—I distances are almost equal. Intermolecular O—H···N and N—H···O hydrogen bonds stabilize the crystal structure and the cation reveals short intramolecular N—H···N hydrogen bonds (Fig. 2 and Table 1). Moreover, there are weak intermolecular π-π interactions between pyrimidine rings, with a shortest ring centroid-centroid distance of 5.239 (6) Å.