organic compounds
Bis[2-(2,4-dinitrobenzyl)pyridinium] biphenyl-4,4′-disulfonate trihydrate
aFaculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia, and bSchool of Biomolecular and Physical Sciences, Griffith University, Nathan, Queensland 4111, Australia
*Correspondence e-mail: g.smith@qut.edu.au
In the structure of the title salt, 2C12H10N3O4+·C12H8O6S22−·3H2O, determined at 173 K, the biphenyl-4,4′-disulfonate dianions lie across crystallographic inversion centres with the sulfonate groups interacting head-to-head through centrosymmetric cyclic bis(water)-bridged hydrogen-bonding associations [graph set R44(11)], forming chains. The 2-(2,4-dinitrobenzyl)pyridinium cations are linked to these chains through pyridinium–water N—H⋯O hydrogen bonds and a two-dimensional network is formed through water bridges between sulfonate and 2-nitro O atoms, while the structure also has weak cation–anion π–π aromatic ring interactions [minimum ring centroid separation = 3.8441 (13) Å].
Related literature
For structural data on 2-(2,4-dinitrobenzyl)pyridine and related compounds, see Seff & Trueblood (1968); Scherl et al. (1996); Naumov et al. (2002, 2005). For bipyridine-4,4′-disulfonate compounds, see: Swift et al. (1998); Swift & Ward (1998); Holman & Ward (2000); Liao et al. (2001). For graph-set notation, see: Etter et al. (1990).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED; program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON.
Supporting information
https://doi.org/10.1107/S1600536810014819/ng2763sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810014819/ng2763Isup2.hkl
The title compound was synthesized by heating together under reflux for 10 minutes, 1 mmol quantities of 2-(2,4-dinitrobenzyl)pyridine with biphenyl-4,4'-disulfonic acid in 50 ml of 50% ethanol–water. After concentration to ca. 30 ml, partial room temperature evaporation of the hot-filtered solution gave colourless blade-shaped flat prisms (m.p. 413 K) from which a block section was cleaved for the X-ray analysis.
Hydrogen atoms involved in hydrogen-bonding interactions were located by difference methods and their positional and isotropic displacement parameters were refined. Other H atoms were included in the
at calculated positions [C–H = 0.93 Å (aromatic) and 0.97 Å (aliphatic) and with Uiso(H) = 1.2Ueq(C)], and treated as riding. One of the water molecules was found to have partial occupancy which was refined to 0.50 (1) and subsequently set invariant.The
2-(2,4-dinitrobenzyl)pyridine (DNBP) has been a compound of considerable interest for more than 40 years because of its unusual photochromic characteristics. Irradiation of the colourless crystals with light of wavelength 400nm or less results in the formation of a deep blue coloration in a reversible tautomeric reaction. The structure of the colourless form has been determined (Seff & Trueblood, 1968; Scherl et al., 1996), while in another determination (Naumov et al., 2002), the structures of both forms were determined, confirming the presence of giving nitro-assisted proton transfer (NAPT) involving an oxygen of the o-nitro substituent group. The effect is not present in the p-nitro-substituted isomer. Although the structure of the chloride salt of DNBP is known (Naumov et al., 2005), no other examples of analogous compounds are present in the CSD.Of a number of reactions of DNBP with aromatic carboxylic and β-alanine (Liao et al., 2001), but the bis(guanidinium) salt is notable as a co-host structure for cooperative guest recognition in clathrate formation with numerous aromatic monocyclic and polycyclic hydrocarbons (Swift & Ward, 1998; Swift et al., 1998; Holman & Ward, 2000).
in 50% ethanol–water, we found that only one, biphenyl-4,4'-disulfonic acid (BPDS) gave crystals of suitable quality for X-ray analysis, the title compound 2(C12H10N3O4+) C12H8O6S22- . 3H2O (I), the structure of which is reported here. The structures of 1:2 proton-transfer compounds of BPDS are also not prevalent, e.g. withWith compound (I) (Fig. 1), the BPDS dianions lie across crystallographic inversion centres with the sulfonate groups interacting head-to-head through centrosymmetric cyclic bis(water)-bridged hydrogen-bonding associations [graph set R44(11) (Etter et al., 1990)], forming one-dimensional chain structures (Fig 2). The cations are linked to these chains through pyridinium N+–H···Owater hydrogen bonds (Table 1). The second water molecule (O2W) which has only 50% occupancy, forms a Osulfonate···H–O–H···Oo-nitro hydrogen bond, bridging the chains down the b axial direction, giving a two-dimensional network structure. There are also weak cation–anion π–π aromatic ring interactions present [minimum ring centroid separation 3.8441 (13) Å]. The hydrogen-bond-constrained o-nitro group in the DNBPY cation in the structure obviates any possible photochromic effects in this compound.
Also present in the BPDS dianions are short intramolecular H2A···H6Aiii/H6A···H2Aiii contacts (2.01 Å) [symmetry code (iii) -x + 2, -y + 1, -z +1] resulting from the BPDS species being planar. There is also a short intramolecular H···H contact involving an aromatic ring H and one of the water H atoms [H6···H22Wi, 2.06 Å]. With the DNBP cation the associated o-nitro group is rotated out of the plane of the benzene ring while the unassociated p-nitro group is essentially coplanar [torsion angles C11–C21–N21–O22, 149.17 (19)° and C31–C41–N41–O42, 178.02 (9)°].
For structural data on 2-(2,4-dinitrobenzyl)pyridine and related compounds, see Seff & Trueblood (1968); Scherl et al. (1996); Naumov et al. (2002, 2005). For bipyridine-4,4'-disulfonate compounds, see: Swift, Reynolds & Ward (1998); Swift & Ward (1998);Holman & Ward (2000); Liao et al. (2001). For graph-set notation, see: Etter et al. (1990).
Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell
CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON (Spek, 2009).Fig. 1. Molecular configuration and atom naming scheme for the DNBP cation, the BPDS dianion and the two water molecules of solvation [O1W , O2W, with the latter having SOF = 0.5 (1)], in the asymmetric unit of (I). The dianion lies across an inversion centre [symmetry code (iii) -x + 2, -y + 1, -z +1] and displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. The two-dimensional hydrogen-bonded network structure of (I) extending viewed down the approximate a cell direction showing the water-linked BPDS chains and water-bridged extensions down b. Hydrogen bonds are shown as dashed lines and non-interactive H atoms are omitted. For symmetry codes, see Table 1. |
2C12H10N3O4+·C12H8O6S22−·3H2O | Z = 1 |
Mr = 886.83 | F(000) = 460 |
Triclinic, P1 | Dx = 1.557 Mg m−3 |
Hall symbol: -P 1 | Melting point: 413 K |
a = 8.3897 (3) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 10.6455 (4) Å | Cell parameters from 5908 reflections |
c = 11.7405 (5) Å | θ = 3.0–32.3° |
α = 97.879 (3)° | µ = 0.23 mm−1 |
β = 96.926 (3)° | T = 173 K |
γ = 112.066 (4)° | Prism, colourless |
V = 945.53 (7) Å3 | 0.30 × 0.25 × 0.15 mm |
Oxford Diffraction Gemini-S CCD-detector diffractometer | 3844 independent reflections |
Radiation source: Enhance (Mo) X-ray source | 3441 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
Detector resolution: 16.08 pixels mm-1 | θmax = 26.5°, θmin = 3.0° |
ω scans | h = −10→10 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −13→13 |
Tmin = 0.98, Tmax = 0.99 | l = −14→14 |
8964 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)] = 0.042 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.104 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0505P)2 + 0.4454P] where P = (Fo2 + 2Fc2)/3 |
3844 reflections | (Δ/σ)max = 0.001 |
296 parameters | Δρmax = 0.35 e Å−3 |
0 restraints | Δρmin = −0.30 e Å−3 |
2C12H10N3O4+·C12H8O6S22−·3H2O | γ = 112.066 (4)° |
Mr = 886.83 | V = 945.53 (7) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.3897 (3) Å | Mo Kα radiation |
b = 10.6455 (4) Å | µ = 0.23 mm−1 |
c = 11.7405 (5) Å | T = 173 K |
α = 97.879 (3)° | 0.30 × 0.25 × 0.15 mm |
β = 96.926 (3)° |
Oxford Diffraction Gemini-S CCD-detector diffractometer | 3844 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3441 reflections with I > 2σ(I) |
Tmin = 0.98, Tmax = 0.99 | Rint = 0.020 |
8964 measured reflections |
R[F2 > 2σ(F2)] = 0.042 | 0 restraints |
wR(F2) = 0.104 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.35 e Å−3 |
3844 reflections | Δρmin = −0.30 e Å−3 |
296 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles |
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) | |
O21 | 0.5436 (2) | 0.07535 (18) | 0.71892 (15) | 0.0487 (6) | |
O22 | 0.51554 (19) | 0.13704 (18) | 0.55354 (14) | 0.0460 (5) | |
O41 | 0.9552 (2) | 0.10842 (19) | 0.32892 (14) | 0.0548 (6) | |
O42 | 1.2220 (2) | 0.1865 (2) | 0.41565 (15) | 0.0627 (7) | |
N1 | 0.7507 (2) | 0.15288 (18) | 1.02586 (14) | 0.0291 (5) | |
N21 | 0.6039 (2) | 0.12314 (17) | 0.63793 (15) | 0.0319 (5) | |
N41 | 1.0680 (2) | 0.15615 (18) | 0.41645 (15) | 0.0350 (5) | |
C2 | 0.8078 (2) | 0.1261 (2) | 0.92656 (16) | 0.0276 (5) | |
C3 | 0.8089 (3) | −0.0026 (2) | 0.89375 (18) | 0.0348 (6) | |
C4 | 0.7505 (3) | −0.1008 (2) | 0.9630 (2) | 0.0403 (7) | |
C5 | 0.6935 (3) | −0.0690 (2) | 1.06403 (19) | 0.0400 (7) | |
C6 | 0.6954 (3) | 0.0601 (2) | 1.09439 (18) | 0.0364 (7) | |
C11 | 0.9122 (2) | 0.21211 (18) | 0.74513 (16) | 0.0256 (5) | |
C21 | 0.7921 (2) | 0.16202 (18) | 0.63956 (16) | 0.0260 (5) | |
C31 | 0.8394 (2) | 0.14506 (19) | 0.53166 (17) | 0.0278 (5) | |
C41 | 1.0145 (2) | 0.17560 (19) | 0.53089 (16) | 0.0275 (5) | |
C51 | 1.1393 (2) | 0.2235 (2) | 0.63196 (17) | 0.0303 (6) | |
C61 | 1.0871 (2) | 0.2431 (2) | 0.73779 (17) | 0.0291 (6) | |
C71 | 0.8663 (3) | 0.2446 (2) | 0.86313 (17) | 0.0318 (6) | |
S4A | 0.60027 (6) | 0.49714 (5) | 0.81725 (4) | 0.0279 (2) | |
O41A | 0.71609 (19) | 0.57569 (16) | 0.92704 (12) | 0.0391 (5) | |
O42A | 0.51335 (19) | 0.35151 (15) | 0.81872 (14) | 0.0412 (5) | |
O43A | 0.4786 (2) | 0.55635 (18) | 0.77623 (13) | 0.0436 (5) | |
C1A | 0.9443 (2) | 0.50258 (19) | 0.54441 (16) | 0.0272 (6) | |
C2A | 0.7662 (3) | 0.4645 (3) | 0.51220 (19) | 0.0576 (9) | |
C3A | 0.6617 (3) | 0.4658 (3) | 0.59494 (19) | 0.0531 (9) | |
C4A | 0.7357 (2) | 0.50677 (19) | 0.71157 (16) | 0.0263 (6) | |
C5A | 0.9122 (3) | 0.5469 (2) | 0.74546 (18) | 0.0399 (6) | |
C6A | 1.0155 (3) | 0.5444 (2) | 0.66214 (19) | 0.0409 (7) | |
O1W | 0.7300 (2) | 0.39624 (19) | 1.07848 (14) | 0.0422 (6) | |
O2W | 0.4510 (4) | 0.7847 (3) | 0.7040 (3) | 0.0475 (11) | 0.500 |
H1 | 0.746 (4) | 0.240 (3) | 1.049 (2) | 0.059 (8)* | |
H3 | 0.84830 | −0.02380 | 0.82590 | 0.0420* | |
H4 | 0.75000 | −0.18830 | 0.94090 | 0.0480* | |
H5 | 0.65440 | −0.13420 | 1.11060 | 0.0480* | |
H6 | 0.65840 | 0.08380 | 1.16260 | 0.0440* | |
H31 | 0.75700 | 0.11440 | 0.46260 | 0.0330* | |
H51 | 1.25620 | 0.24210 | 0.62900 | 0.0360* | |
H61 | 1.17110 | 0.27820 | 0.80620 | 0.0350* | |
H71 | 0.96790 | 0.31920 | 0.91260 | 0.0380* | |
H72 | 0.77380 | 0.27800 | 0.85240 | 0.0380* | |
H2A | 0.71510 | 0.43730 | 0.43320 | 0.0690* | |
H3A | 0.54180 | 0.43900 | 0.57140 | 0.0640* | |
H5A | 0.96300 | 0.57590 | 0.82450 | 0.0480* | |
H6A | 1.13540 | 0.57160 | 0.68620 | 0.0490* | |
H11W | 0.662 (4) | 0.407 (3) | 1.127 (3) | 0.069 (9)* | |
H12W | 0.719 (4) | 0.441 (3) | 1.031 (3) | 0.062 (9)* | |
H21W | 0.460 (5) | 0.730 (4) | 0.745 (4) | 0.060 (10)* | 0.500 |
H22W | 0.515 (5) | 0.860 (3) | 0.755 (3) | 0.065 (10)* | 0.500 |
U11 | U22 | U33 | U12 | U13 | U23 | |
O21 | 0.0343 (8) | 0.0630 (11) | 0.0535 (10) | 0.0155 (8) | 0.0225 (7) | 0.0261 (8) |
O22 | 0.0318 (8) | 0.0596 (10) | 0.0475 (9) | 0.0198 (8) | 0.0040 (7) | 0.0119 (8) |
O41 | 0.0577 (11) | 0.0678 (12) | 0.0295 (8) | 0.0162 (9) | 0.0131 (8) | 0.0011 (8) |
O42 | 0.0491 (10) | 0.1108 (16) | 0.0475 (10) | 0.0453 (11) | 0.0280 (8) | 0.0225 (10) |
N1 | 0.0249 (8) | 0.0370 (10) | 0.0239 (8) | 0.0107 (7) | 0.0051 (6) | 0.0052 (7) |
N21 | 0.0282 (9) | 0.0288 (9) | 0.0387 (9) | 0.0105 (7) | 0.0107 (7) | 0.0053 (7) |
N41 | 0.0446 (10) | 0.0357 (9) | 0.0341 (9) | 0.0210 (8) | 0.0187 (8) | 0.0131 (8) |
C2 | 0.0229 (9) | 0.0318 (10) | 0.0246 (9) | 0.0074 (8) | 0.0048 (7) | 0.0042 (8) |
C3 | 0.0401 (11) | 0.0317 (11) | 0.0320 (10) | 0.0133 (9) | 0.0092 (9) | 0.0057 (8) |
C4 | 0.0397 (12) | 0.0326 (11) | 0.0442 (12) | 0.0116 (10) | −0.0008 (9) | 0.0097 (9) |
C5 | 0.0294 (11) | 0.0508 (13) | 0.0386 (12) | 0.0104 (10) | 0.0044 (9) | 0.0236 (10) |
C6 | 0.0273 (10) | 0.0550 (14) | 0.0270 (10) | 0.0136 (10) | 0.0067 (8) | 0.0152 (9) |
C11 | 0.0304 (10) | 0.0207 (9) | 0.0275 (9) | 0.0096 (8) | 0.0115 (7) | 0.0068 (7) |
C21 | 0.0253 (9) | 0.0213 (9) | 0.0334 (10) | 0.0094 (7) | 0.0102 (7) | 0.0075 (7) |
C31 | 0.0301 (10) | 0.0254 (9) | 0.0275 (9) | 0.0106 (8) | 0.0058 (7) | 0.0054 (7) |
C41 | 0.0331 (10) | 0.0259 (9) | 0.0287 (9) | 0.0140 (8) | 0.0134 (8) | 0.0090 (8) |
C51 | 0.0265 (10) | 0.0333 (10) | 0.0366 (11) | 0.0141 (8) | 0.0132 (8) | 0.0116 (8) |
C61 | 0.0286 (10) | 0.0302 (10) | 0.0286 (10) | 0.0115 (8) | 0.0051 (8) | 0.0072 (8) |
C71 | 0.0381 (11) | 0.0269 (10) | 0.0294 (10) | 0.0106 (9) | 0.0131 (8) | 0.0034 (8) |
S4A | 0.0314 (3) | 0.0369 (3) | 0.0266 (2) | 0.0204 (2) | 0.0159 (2) | 0.0132 (2) |
O41A | 0.0427 (8) | 0.0521 (9) | 0.0272 (7) | 0.0214 (7) | 0.0150 (6) | 0.0081 (6) |
O42A | 0.0408 (8) | 0.0418 (9) | 0.0492 (9) | 0.0168 (7) | 0.0242 (7) | 0.0205 (7) |
O43A | 0.0532 (9) | 0.0702 (11) | 0.0371 (8) | 0.0471 (9) | 0.0254 (7) | 0.0254 (8) |
C1A | 0.0332 (10) | 0.0285 (10) | 0.0298 (10) | 0.0170 (8) | 0.0174 (8) | 0.0136 (8) |
C2A | 0.0474 (14) | 0.127 (2) | 0.0247 (11) | 0.0570 (16) | 0.0166 (10) | 0.0264 (13) |
C3A | 0.0385 (12) | 0.113 (2) | 0.0303 (11) | 0.0483 (14) | 0.0158 (10) | 0.0256 (13) |
C4A | 0.0325 (10) | 0.0283 (10) | 0.0295 (9) | 0.0187 (8) | 0.0174 (8) | 0.0129 (8) |
C5A | 0.0303 (10) | 0.0487 (13) | 0.0278 (10) | 0.0045 (9) | 0.0116 (8) | −0.0068 (9) |
C6A | 0.0241 (10) | 0.0476 (13) | 0.0370 (11) | 0.0014 (9) | 0.0144 (8) | −0.0061 (10) |
O1W | 0.0555 (10) | 0.0677 (11) | 0.0272 (8) | 0.0456 (9) | 0.0177 (7) | 0.0154 (8) |
O2W | 0.0471 (19) | 0.0426 (18) | 0.0560 (15) | 0.0206 (15) | 0.0161 (15) | 0.0066 (15) |
S4A—O42A | 1.4479 (16) | C21—C31 | 1.381 (3) |
S4A—O43A | 1.4558 (19) | C31—C41 | 1.382 (3) |
S4A—C4A | 1.7687 (19) | C41—C51 | 1.378 (3) |
S4A—O41A | 1.4481 (15) | C51—C61 | 1.381 (3) |
O21—N21 | 1.214 (2) | C3—H3 | 0.9300 |
O22—N21 | 1.224 (2) | C4—H4 | 0.9300 |
O41—N41 | 1.213 (2) | C5—H5 | 0.9300 |
O42—N41 | 1.210 (3) | C6—H6 | 0.9300 |
O1W—H11W | 0.88 (4) | C31—H31 | 0.9300 |
O1W—H12W | 0.80 (3) | C51—H51 | 0.9300 |
O2W—H21W | 0.82 (4) | C61—H61 | 0.9300 |
O2W—H22W | 0.87 (3) | C71—H71 | 0.9700 |
N1—C6 | 1.342 (3) | C71—H72 | 0.9700 |
N1—C2 | 1.348 (2) | C1A—C2A | 1.381 (3) |
N21—C21 | 1.471 (3) | C1A—C6A | 1.378 (3) |
N41—C41 | 1.479 (3) | C1A—C1Ai | 1.491 (3) |
N1—H1 | 0.95 (3) | C2A—C3A | 1.387 (4) |
C2—C3 | 1.375 (3) | C3A—C4A | 1.371 (3) |
C2—C71 | 1.506 (3) | C4A—C5A | 1.367 (3) |
C3—C4 | 1.392 (3) | C5A—C6A | 1.387 (3) |
C4—C5 | 1.378 (3) | C2A—H2A | 0.9300 |
C5—C6 | 1.365 (3) | C3A—H3A | 0.9300 |
C11—C61 | 1.394 (3) | C5A—H5A | 0.9300 |
C11—C71 | 1.512 (3) | C6A—H6A | 0.9300 |
C11—C21 | 1.396 (3) | ||
O43A—S4A—C4A | 105.78 (9) | C2—C3—H3 | 120.00 |
O41A—S4A—C4A | 106.12 (9) | C4—C3—H3 | 120.00 |
O41A—S4A—O42A | 112.56 (9) | C5—C4—H4 | 120.00 |
O41A—S4A—O43A | 113.37 (10) | C3—C4—H4 | 120.00 |
O42A—S4A—O43A | 112.51 (10) | C6—C5—H5 | 121.00 |
O42A—S4A—C4A | 105.74 (9) | C4—C5—H5 | 121.00 |
H11W—O1W—H12W | 104 (3) | N1—C6—H6 | 120.00 |
H21W—O2W—H22W | 97 (4) | C5—C6—H6 | 120.00 |
C2—N1—C6 | 123.13 (19) | C41—C31—H31 | 121.00 |
O21—N21—O22 | 123.47 (19) | C21—C31—H31 | 121.00 |
O22—N21—C21 | 118.33 (17) | C61—C51—H51 | 121.00 |
O21—N21—C21 | 118.17 (17) | C41—C51—H51 | 121.00 |
O42—N41—C41 | 118.02 (17) | C11—C61—H61 | 119.00 |
O41—N41—O42 | 123.59 (19) | C51—C61—H61 | 119.00 |
O41—N41—C41 | 118.38 (18) | H71—C71—H72 | 107.00 |
C6—N1—H1 | 117.1 (16) | C2—C71—H72 | 108.00 |
C2—N1—H1 | 119.8 (16) | C11—C71—H71 | 108.00 |
N1—C2—C3 | 118.39 (18) | C11—C71—H72 | 108.00 |
N1—C2—C71 | 114.88 (18) | C2—C71—H71 | 108.00 |
C3—C2—C71 | 126.73 (18) | C1Ai—C1A—C2A | 121.47 (17) |
C2—C3—C4 | 119.4 (2) | C1Ai—C1A—C6A | 121.02 (18) |
C3—C4—C5 | 120.3 (2) | C2A—C1A—C6A | 117.51 (19) |
C4—C5—C6 | 118.71 (19) | C1A—C2A—C3A | 121.5 (2) |
N1—C6—C5 | 120.0 (2) | C2A—C3A—C4A | 119.8 (2) |
C61—C11—C71 | 118.98 (18) | S4A—C4A—C5A | 120.50 (15) |
C21—C11—C71 | 124.29 (18) | C3A—C4A—C5A | 119.8 (2) |
C21—C11—C61 | 116.55 (17) | S4A—C4A—C3A | 119.64 (17) |
C11—C21—C31 | 123.34 (17) | C4A—C5A—C6A | 120.1 (2) |
N21—C21—C11 | 120.82 (16) | C1A—C6A—C5A | 121.4 (2) |
N21—C21—C31 | 115.84 (16) | C1A—C2A—H2A | 119.00 |
C21—C31—C41 | 117.06 (17) | C3A—C2A—H2A | 119.00 |
N41—C41—C51 | 119.43 (17) | C4A—C3A—H3A | 120.00 |
C31—C41—C51 | 122.50 (17) | C2A—C3A—H3A | 120.00 |
N41—C41—C31 | 118.07 (17) | C4A—C5A—H5A | 120.00 |
C41—C51—C61 | 118.54 (17) | C6A—C5A—H5A | 120.00 |
C11—C61—C51 | 121.97 (18) | C1A—C6A—H6A | 119.00 |
C2—C71—C11 | 115.69 (17) | C5A—C6A—H6A | 119.00 |
O43A—S4A—C4A—C5A | 137.52 (17) | C61—C11—C21—C31 | −1.2 (3) |
O42A—S4A—C4A—C3A | 73.2 (2) | C71—C11—C21—N21 | −6.5 (3) |
O41A—S4A—C4A—C3A | −167.09 (19) | C71—C11—C21—C31 | 173.82 (18) |
O41A—S4A—C4A—C5A | 16.81 (19) | C21—C11—C61—C51 | −1.0 (3) |
O42A—S4A—C4A—C5A | −102.95 (18) | C71—C11—C61—C51 | −176.22 (18) |
O43A—S4A—C4A—C3A | −46.4 (2) | N21—C21—C31—C41 | −177.51 (17) |
C6—N1—C2—C71 | −179.2 (2) | C11—C21—C31—C41 | 2.2 (3) |
C6—N1—C2—C3 | 0.2 (3) | C21—C31—C41—N41 | 179.06 (17) |
C2—N1—C6—C5 | −0.7 (3) | C21—C31—C41—C51 | −1.2 (3) |
O21—N21—C21—C11 | −32.8 (3) | C31—C41—C51—C61 | −0.8 (3) |
O21—N21—C21—C31 | 146.90 (19) | N41—C41—C51—C61 | 178.96 (18) |
O22—N21—C21—C31 | −31.1 (3) | C41—C51—C61—C11 | 1.9 (3) |
O22—N21—C21—C11 | 149.17 (19) | C6A—C1A—C2A—C3A | −1.1 (4) |
O42—N41—C41—C31 | 178.02 (19) | C1Ai—C1A—C2A—C3A | 178.3 (2) |
O42—N41—C41—C51 | −1.7 (3) | C2A—C1A—C6A—C5A | 0.7 (3) |
O41—N41—C41—C51 | 176.96 (19) | C1Ai—C1A—C6A—C5A | −178.72 (19) |
O41—N41—C41—C31 | −3.3 (3) | C2A—C1A—C1Ai—C2Ai | −180.0 (2) |
N1—C2—C71—C11 | −173.63 (18) | C2A—C1A—C1Ai—C6Ai | 0.7 (3) |
N1—C2—C3—C4 | 0.4 (3) | C6A—C1A—C1Ai—C2Ai | −0.7 (3) |
C71—C2—C3—C4 | 179.8 (2) | C6A—C1A—C1Ai—C6Ai | 180.0 (2) |
C3—C2—C71—C11 | 7.0 (3) | C1A—C2A—C3A—C4A | 0.6 (4) |
C2—C3—C4—C5 | −0.6 (4) | C2A—C3A—C4A—S4A | −175.7 (2) |
C3—C4—C5—C6 | 0.1 (4) | C2A—C3A—C4A—C5A | 0.4 (4) |
C4—C5—C6—N1 | 0.5 (4) | S4A—C4A—C5A—C6A | 175.26 (16) |
C21—C11—C71—C2 | 88.6 (2) | C3A—C4A—C5A—C6A | −0.8 (3) |
C61—C11—C71—C2 | −96.6 (2) | C4A—C5A—C6A—C1A | 0.3 (3) |
C61—C11—C21—N21 | 178.55 (17) |
Symmetry code: (i) −x+2, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O1W | 0.95 (3) | 1.71 (3) | 2.655 (3) | 175 (3) |
O1W—H11W···O43Aii | 0.88 (4) | 1.84 (4) | 2.716 (2) | 175 (3) |
O1W—H12W···O41A | 0.80 (3) | 2.01 (3) | 2.806 (2) | 172 (3) |
O2W—H21W···O43A | 0.82 (4) | 1.99 (4) | 2.761 (4) | 155 (4) |
O2W—H22W···O21iii | 0.87 (3) | 2.32 (3) | 2.867 (2) | 124 (3) |
C2A—H2A···O2Wiv | 0.93 | 2.46 | 3.195 (4) | 136 |
C4—H4···O41Av | 0.93 | 2.40 | 3.309 (3) | 165 |
C5—H5···O42Avi | 0.93 | 2.53 | 3.427 (3) | 163 |
C5A—H5A···O41A | 0.93 | 2.52 | 2.897 (3) | 105 |
C5A—H5A···O1Wvii | 0.93 | 2.58 | 3.232 (3) | 128 |
C6—H6···O2Wii | 0.93 | 2.44 | 3.316 (4) | 156 |
C6—H6···O21vi | 0.93 | 2.60 | 3.265 (3) | 129 |
C71—H72···O21 | 0.97 | 2.46 | 2.799 (3) | 100 |
C71—H72···O42A | 0.97 | 2.59 | 3.558 (3) | 176 |
Symmetry codes: (ii) −x+1, −y+1, −z+2; (iii) x, y+1, z; (iv) −x+1, −y+1, −z+1; (v) x, y−1, z; (vi) −x+1, −y, −z+2; (vii) −x+2, −y+1, −z+2. |
Experimental details
Crystal data | |
Chemical formula | 2C12H10N3O4+·C12H8O6S22−·3H2O |
Mr | 886.83 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 173 |
a, b, c (Å) | 8.3897 (3), 10.6455 (4), 11.7405 (5) |
α, β, γ (°) | 97.879 (3), 96.926 (3), 112.066 (4) |
V (Å3) | 945.53 (7) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.30 × 0.25 × 0.15 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini-S CCD-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.98, 0.99 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8964, 3844, 3441 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.628 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.042, 0.104, 1.03 |
No. of reflections | 3844 |
No. of parameters | 296 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.35, −0.30 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2008), CrysAlis RED (Oxford Diffraction, 2008), SIR92 (Altomare et al., 1994), SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O1W | 0.95 (3) | 1.71 (3) | 2.655 (3) | 175 (3) |
O1W—H11W···O43Ai | 0.88 (4) | 1.84 (4) | 2.716 (2) | 175 (3) |
O1W—H12W···O41A | 0.80 (3) | 2.01 (3) | 2.806 (2) | 172 (3) |
O2W—H21W···O43A | 0.82 (4) | 1.99 (4) | 2.761 (4) | 155 (4) |
O2W—H22W···O21ii | 0.87 (3) | 2.32 (3) | 2.867 (2) | 124 (3) |
Symmetry codes: (i) −x+1, −y+1, −z+2; (ii) x, y+1, z. |
Acknowledgements
The authors acknowledge financial support from the Australian Research Council, the Faculty of Science and Technology, Queensland University of Technology, and the School of Biomolecular and Physical Sciences, Griffith University.
References
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The Lewis base 2-(2,4-dinitrobenzyl)pyridine (DNBP) has been a compound of considerable interest for more than 40 years because of its unusual photochromic characteristics. Irradiation of the colourless crystals with light of wavelength 400nm or less results in the formation of a deep blue coloration in a reversible tautomeric reaction. The structure of the colourless form has been determined (Seff & Trueblood, 1968; Scherl et al., 1996), while in another determination (Naumov et al., 2002), the structures of both forms were determined, confirming the presence of two-photon excitation giving nitro-assisted proton transfer (NAPT) involving an oxygen of the o-nitro substituent group. The effect is not present in the p-nitro-substituted isomer. Although the structure of the chloride salt of DNBP is known (Naumov et al., 2005), no other examples of analogous compounds are present in the CSD.
Of a number of reactions of DNBP with aromatic carboxylic and sulfonic acids in 50% ethanol–water, we found that only one, biphenyl-4,4'-disulfonic acid (BPDS) gave crystals of suitable quality for X-ray analysis, the title compound 2(C12H10N3O4+) C12H8O6S22- . 3H2O (I), the structure of which is reported here. The structures of 1:2 proton-transfer compounds of BPDS are also not prevalent, e.g. with β-alanine (Liao et al., 2001), but the bis(guanidinium) salt is notable as a co-host structure for cooperative guest recognition in clathrate formation with numerous aromatic monocyclic and polycyclic hydrocarbons (Swift & Ward, 1998; Swift et al., 1998; Holman & Ward, 2000).
With compound (I) (Fig. 1), the BPDS dianions lie across crystallographic inversion centres with the sulfonate groups interacting head-to-head through centrosymmetric cyclic bis(water)-bridged hydrogen-bonding associations [graph set R44(11) (Etter et al., 1990)], forming one-dimensional chain structures (Fig 2). The cations are linked to these chains through pyridinium N+–H···Owater hydrogen bonds (Table 1). The second water molecule (O2W) which has only 50% occupancy, forms a Osulfonate···H–O–H···Oo-nitro hydrogen bond, bridging the chains down the b axial direction, giving a two-dimensional network structure. There are also weak cation–anion π–π aromatic ring interactions present [minimum ring centroid separation 3.8441 (13) Å]. The hydrogen-bond-constrained o-nitro group in the DNBPY cation in the structure obviates any possible photochromic effects in this compound.
Also present in the BPDS dianions are short intramolecular H2A···H6Aiii/H6A···H2Aiii contacts (2.01 Å) [symmetry code (iii) -x + 2, -y + 1, -z +1] resulting from the BPDS species being planar. There is also a short intramolecular H···H contact involving an aromatic ring H and one of the water H atoms [H6···H22Wi, 2.06 Å]. With the DNBP cation the associated o-nitro group is rotated out of the plane of the benzene ring while the unassociated p-nitro group is essentially coplanar [torsion angles C11–C21–N21–O22, 149.17 (19)° and C31–C41–N41–O42, 178.02 (9)°].