organic compounds
A triclinic modification of 5,5′-dinitro-2,2′-dithiodipyridine
aDepartamento de Química, Facultad de Ciencias Básicas, Universidad de Antofagasta, Casilla 170, Antofagasta, Chile, bDepartamento de Física, Facultad de Ciencias Básicas, Universidad de Antofagasta, Casilla 170, Antofagasta, Chile, and cInstituto de Bio-Orgánica 'Antonio González', Universidad de la Laguna, Astrofísico Francisco Sánchez No. 2, La Laguna, Tenerife, Spain
*Correspondence e-mail: ivanbritob@yahoo.com
The 10H6N4O4S2, contains two independent but similar molecules. The structure is a triclinic polymorph of the monoclinic structure reported previously [Brito, Mundaca, Cárdenas, López-Rodríguez & Vargas (2007). Acta Cryst. E63, o3351–o3352]. The most obvious difference between the two polymorphs is the C—S—S—C torsion angle [−80.13 (16), −79.8 (2) and 0° for the two molecules of the triclinic polymorph and the monoclinic polymorph, respectively]. The of the title compound has two intramolecular C—H⋯S interactions with average H⋯S distances of 2.69 Å, whereas this kind of interaction is not evident in the monoclinic polymorph.
of the title compound, CRelated literature
For related literature, see: Allen et al. (1987); Bernstein et al. (1995); Brito et al. (2007); Glidewell et al. (2000); Shefter (1970).
Experimental
Crystal data
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Refinement
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Data collection: COLLECT (Nonius, 1998); cell DENZO-SMN (Otwinowski & Minor, 1997); data reduction: DENZO-SMN; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2003); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S1600536807062630/bt2643sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536807062630/bt2643Isup2.hkl
All reactions were carried out under an atmosphere of purified nitrogen. Solvents were dried and distilled prior to use. 5,5'-dinitro-2,2'-dithiodipyridine and silver trifluoromethanesulfonate were purchased from Aldrich. The title compound was obtained as light yellow prismatic crystals, in an attempts to prepare coordination polymers with silver trifluoromethanesulfonate of the ligand. A mixture of 5,5'-dinitro-2,2'-dithiodipyridine (1 mmol, 310 mg) and silver trifluoromethanesulfonate (1 mmol, 256.9 mg) in methanol (20 ml) was refluxed for 8 h. After slow cooling of the reaction system to room temperature, light yellow prismatic crystals of (I) were formed that were filtered off and washed with cold diethyl ether. FT–IR (KBr pellet, cm-1): ν (w, C—H) 3082, ν(s, N=O of NO2 asymmetric) 1578, ν (v.s. of NO2 symmetric) 1356, ν(w, C—H disubstitution 1,4) 1964, ν(s, C—H disubstitution 1,4) 856, ν (w, C—N) 1101, ν(s, C=C) 1600, ν (w, C—H) 1014, (s, C=N) 1512, ν (w, C—S) 743, ν(w S—S) 555.
H atoms were positioned geometrically. In the final cycles of the
all H atoms were constrained to ride on their parent atoms, with C—H distances of 0.93 Å and with Uiso(H) = 1.2 Ueq(C).The material was difficult to obtain in a suitable crystalline form and the best available specimen was lost during data collection, resulting in 95% completeness.
This paper forms part of our continuing study of the synthesis and structural characterization of divalent sulfur compounds (Brito et al., 2007 and references therein). We are particularly interested in the utility of the title compound of as flexible ligand, and its binding modes, for the fabrication of different coordination polymers topologies. We report here the structure of a new polymorph of 5,5'-Dinitro-2,2'-dithiodipyridine isolated during attempts to synthetize coordination polymers with silver trifluoromethanesulfonate of the ligand (Fig. 1, Table 1). The bond lenghts and the conformation are significantly different from those found in the monoclinic modification (Brito et al., 2007). The observed difference between (I) and the previously reported polymorph is in the torsion angle C—S—S—C [80.0 (2) and 0°, respectively]. A database survey of C—S—S—C fragments (Allen et al., 1987) found that S—S bond distances are bimodally distributed: for torsion angles in the ranges 75–105 and 0–20°, the mean S—S bond distances are 2.031 (15) and 2.070 (22) Å, respectively. The corresponding value in the title compound is 2.025 (2) Å and 2.0719 (11) Å for the previously polymorph placing it in the lower quartile for Allen's first set. In both polymorphs the torsion angles X—C—S—S (where X=N or C) are close to 0 or 180° and within the range found in other substituted aromatic disulfides with an equatorial conformation according to the Shefter classification (Shefter, 1970).
The molecular conformations are dominated by near orthogonality of the lone pairs on the two adjacent S atoms (Glidewell et al., 2000). The molecular packing in the title compound is completely different from that of the monoclinic polymorph. Only in the triclinic form the phenyl rings participant in significant intramolecular C—H···S interactions with average H···S distances of 2.69 Å. These interactions may stabilize the conformation adopted by the molecules in the solid state (Fig. 1). The molecules are linked into chains by two intermolecular C—H···O hydrogen bond. Atoms C8 and C18 in the molecules at (x,y,z) acts as hydrogen bonds donor vía atom H8 and H18 to atoms O1 and O5 in the molecule at (x,-1 + y,z) respectively, so generating by translation two C(12) chains running parallel to [010] direction (Bernstein et al., 1995), (Fig. 2, Table 2). The triclinic modification is much less compact, as noted from the lower density (1.638 Mg m-3 compared with 1.725 Mg m-3 for the monoclinic form).
For related literature, see: Allen et al. (1987); Bernstein et al. (1995); Brito et al. (2007); Glidewell et al. (2000); Shefter (1970).
Data collection: COLLECT (Nonius, 1998); cell
DENZO-SMN (Otwinowski & Minor, 1997); data reduction: DENZO-SMN (Otwinowski & Minor, 1997); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2003); software used to prepare material for publication: WinGX (Farrugia, 1999).C10H6N4O4S2 | Z = 4 |
Mr = 310.31 | F(000) = 632 |
Triclinic, P1 | Dx = 1.638 Mg m−3 |
Hall symbol: -P 1 | Melting point: 420 K |
a = 7.7832 (12) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 11.8515 (11) Å | Cell parameters from 11236 reflections |
c = 14.513 (2) Å | θ = 1.4–26.5° |
α = 82.353 (4)° | µ = 0.44 mm−1 |
β = 82.095 (5)° | T = 298 K |
γ = 72.460 (9)° | Prismatic, light yellow |
V = 1258.4 (3) Å3 | 0.20 × 0.10 × 0.10 mm |
Nonius KappaCCD area-detector diffractometer | 4931 independent reflections |
Radiation source: fine-focus sealed tube | 4101 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.062 |
φ scans, and ω scans with κ offsets | θmax = 26.5°, θmin = 1.4° |
Absorption correction: multi-scan (SORTAV; Blessing, 1995) | h = −9→9 |
Tmin = 0.937, Tmax = 0.948 | k = −12→14 |
11205 measured reflections | l = −18→18 |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.088 | w = 1/[σ2(Fo2) + (0.0368P)2 + 1.5007P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.209 | (Δ/σ)max = 0.007 |
S = 1.16 | Δρmax = 0.33 e Å−3 |
4931 reflections | Δρmin = −0.28 e Å−3 |
362 parameters |
C10H6N4O4S2 | γ = 72.460 (9)° |
Mr = 310.31 | V = 1258.4 (3) Å3 |
Triclinic, P1 | Z = 4 |
a = 7.7832 (12) Å | Mo Kα radiation |
b = 11.8515 (11) Å | µ = 0.44 mm−1 |
c = 14.513 (2) Å | T = 298 K |
α = 82.353 (4)° | 0.20 × 0.10 × 0.10 mm |
β = 82.095 (5)° |
Nonius KappaCCD area-detector diffractometer | 4931 independent reflections |
Absorption correction: multi-scan (SORTAV; Blessing, 1995) | 4101 reflections with I > 2σ(I) |
Tmin = 0.937, Tmax = 0.948 | Rint = 0.062 |
11205 measured reflections |
R[F2 > 2σ(F2)] = 0.088 | 0 restraints |
wR(F2) = 0.209 | H-atom parameters constrained |
S = 1.16 | Δρmax = 0.33 e Å−3 |
4931 reflections | Δρmin = −0.28 e Å−3 |
362 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 | ||
S1 | −0.28532 (14) | 0.36598 (9) | 0.47963 (7) | 0.0648 (3) | |
S2 | −0.33244 (12) | 0.21846 (9) | 0.55311 (8) | 0.0597 (3) | |
S3 | 0.2159 (2) | 0.37139 (15) | 0.72593 (9) | 0.1008 (5) | |
S4 | 0.17109 (18) | 0.22078 (14) | 0.79400 (11) | 0.0932 (5) | |
O1 | −0.1425 (5) | 0.7608 (3) | 0.7099 (3) | 0.0932 (11) | |
O2 | −0.2430 (7) | 0.6621 (3) | 0.8270 (3) | 0.1114 (15) | |
O3 | 0.5190 (4) | −0.0383 (3) | 0.6160 (3) | 0.1013 (14) | |
O4 | 0.4123 (4) | −0.1761 (3) | 0.6849 (3) | 0.0830 (10) | |
O5 | 0.3423 (6) | 0.7628 (3) | 0.9636 (3) | 0.1124 (14) | |
O6 | 0.2541 (7) | 0.6562 (3) | 1.0807 (3) | 0.1078 (13) | |
O7 | 1.0125 (5) | −0.0429 (5) | 0.8735 (4) | 0.143 (2) | |
O8 | 0.8920 (5) | −0.1686 (3) | 0.9535 (3) | 0.0985 (12) | |
N1 | −0.2025 (5) | 0.6797 (3) | 0.7443 (3) | 0.0695 (10) | |
N2 | −0.2166 (5) | 0.5481 (3) | 0.5290 (3) | 0.0675 (9) | |
N3 | 0.0258 (4) | 0.1755 (2) | 0.5594 (2) | 0.0485 (7) | |
N4 | 0.3948 (4) | −0.0788 (3) | 0.6427 (2) | 0.0562 (8) | |
N5 | 0.2906 (5) | 0.6772 (3) | 0.9981 (3) | 0.0765 (11) | |
N6 | 0.2519 (6) | 0.5608 (4) | 0.7817 (3) | 0.0945 (15) | |
N7 | 0.5273 (5) | 0.1785 (3) | 0.8105 (3) | 0.0725 (10) | |
N8 | 0.8822 (6) | −0.0777 (4) | 0.9035 (3) | 0.0798 (11) | |
C1 | −0.2263 (5) | 0.5991 (3) | 0.6821 (3) | 0.0536 (9) | |
C2 | −0.2820 (6) | 0.5018 (3) | 0.7196 (3) | 0.0607 (10) | |
H2 | −0.3062 | 0.4877 | 0.784 | 0.073* | |
C3 | −0.3013 (5) | 0.4261 (3) | 0.6612 (3) | 0.0570 (9) | |
H3 | −0.3366 | 0.3586 | 0.6846 | 0.078 (6)* | |
C4 | −0.2670 (4) | 0.4527 (3) | 0.5671 (3) | 0.0521 (9) | |
C5 | −0.1959 (5) | 0.6208 (3) | 0.5874 (3) | 0.0632 (11) | |
H5 | −0.1598 | 0.6876 | 0.5627 | 0.078 (6)* | |
C6 | −0.1129 (4) | 0.1300 (3) | 0.5804 (2) | 0.0448 (7) | |
C7 | −0.0971 (5) | 0.0159 (3) | 0.6229 (3) | 0.0503 (8) | |
H7 | −0.1982 | −0.0121 | 0.6366 | 0.078 (6)* | |
C8 | 0.0692 (5) | −0.0546 (3) | 0.6443 (3) | 0.0483 (8) | |
H8 | 0.0851 | −0.1316 | 0.6728 | 0.058* | |
C9 | 0.2126 (4) | −0.0072 (3) | 0.6222 (2) | 0.0425 (7) | |
C10 | 0.1881 (5) | 0.1059 (3) | 0.5803 (3) | 0.0505 (8) | |
H10 | 0.2877 | 0.1353 | 0.5658 | 0.061* | |
C11 | 0.2288 (6) | 0.4547 (4) | 0.8158 (3) | 0.0728 (13) | |
C12 | 0.2218 (6) | 0.4174 (4) | 0.9095 (3) | 0.0706 (12) | |
H12 | 0.2054 | 0.3436 | 0.9313 | 0.078 (6)* | |
C13 | 0.2395 (6) | 0.4909 (4) | 0.9697 (3) | 0.0691 (11) | |
H13 | 0.2342 | 0.4685 | 1.0337 | 0.083* | |
C14 | 0.2653 (6) | 0.5984 (4) | 0.9348 (3) | 0.0680 (11) | |
C15 | 0.2697 (7) | 0.6302 (5) | 0.8413 (4) | 0.0888 (16) | |
H15 | 0.286 | 0.7038 | 0.8184 | 0.107* | |
C16 | 0.3897 (6) | 0.1317 (4) | 0.8230 (3) | 0.0690 (11) | |
C17 | 0.4031 (6) | 0.0156 (4) | 0.8614 (4) | 0.0771 (13) | |
H17 | 0.3032 | −0.0136 | 0.8688 | 0.078 (6)* | |
C18 | 0.5647 (6) | −0.0536 (4) | 0.8877 (3) | 0.0708 (11) | |
H18 | 0.5788 | −0.1315 | 0.9137 | 0.085* | |
C19 | 0.7070 (5) | −0.0059 (3) | 0.8749 (3) | 0.0586 (9) | |
C20 | 0.6845 (6) | 0.1087 (4) | 0.8371 (3) | 0.0686 (11) | |
H20 | 0.7831 | 0.1392 | 0.8298 | 0.082* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0590 (6) | 0.0586 (6) | 0.0625 (6) | 0.0052 (5) | −0.0153 (5) | 0.0013 (5) |
S2 | 0.0394 (5) | 0.0547 (6) | 0.0817 (7) | −0.0040 (4) | −0.0121 (4) | −0.0117 (5) |
S3 | 0.0942 (10) | 0.1143 (11) | 0.0657 (8) | 0.0208 (8) | −0.0239 (7) | −0.0129 (7) |
S4 | 0.0649 (8) | 0.1047 (10) | 0.1078 (11) | −0.0014 (7) | −0.0275 (7) | −0.0382 (8) |
O1 | 0.090 (2) | 0.0562 (18) | 0.140 (3) | −0.0325 (17) | −0.023 (2) | 0.0072 (19) |
O2 | 0.192 (5) | 0.070 (2) | 0.087 (3) | −0.056 (3) | −0.024 (3) | −0.0074 (19) |
O3 | 0.0428 (16) | 0.090 (2) | 0.167 (4) | −0.0267 (16) | −0.0314 (19) | 0.040 (2) |
O4 | 0.0621 (18) | 0.0593 (18) | 0.115 (3) | −0.0056 (14) | −0.0246 (17) | 0.0246 (18) |
O5 | 0.114 (3) | 0.083 (2) | 0.153 (4) | −0.057 (2) | −0.017 (3) | 0.014 (2) |
O6 | 0.157 (4) | 0.080 (2) | 0.092 (3) | −0.044 (3) | −0.017 (3) | −0.001 (2) |
O7 | 0.064 (2) | 0.148 (4) | 0.205 (5) | −0.039 (3) | −0.031 (3) | 0.056 (4) |
O8 | 0.097 (3) | 0.074 (2) | 0.113 (3) | −0.0104 (19) | −0.024 (2) | 0.013 (2) |
N1 | 0.069 (2) | 0.0378 (17) | 0.103 (3) | −0.0172 (15) | −0.021 (2) | 0.0058 (18) |
N2 | 0.060 (2) | 0.057 (2) | 0.071 (2) | −0.0063 (16) | −0.0025 (17) | 0.0161 (17) |
N3 | 0.0421 (15) | 0.0390 (14) | 0.0646 (18) | −0.0129 (12) | −0.0090 (13) | 0.0010 (13) |
N4 | 0.0443 (17) | 0.0510 (18) | 0.072 (2) | −0.0121 (14) | −0.0162 (14) | 0.0044 (15) |
N5 | 0.071 (2) | 0.057 (2) | 0.097 (3) | −0.0150 (18) | −0.014 (2) | 0.005 (2) |
N6 | 0.095 (3) | 0.092 (3) | 0.064 (2) | 0.003 (2) | −0.002 (2) | 0.027 (2) |
N7 | 0.072 (2) | 0.065 (2) | 0.076 (2) | −0.0121 (18) | −0.0121 (19) | −0.0057 (18) |
N8 | 0.073 (3) | 0.070 (2) | 0.091 (3) | −0.016 (2) | −0.009 (2) | 0.003 (2) |
C1 | 0.0452 (19) | 0.0357 (17) | 0.075 (3) | −0.0060 (14) | −0.0102 (17) | 0.0040 (16) |
C2 | 0.074 (3) | 0.0427 (19) | 0.063 (2) | −0.0202 (18) | 0.0015 (19) | 0.0056 (17) |
C3 | 0.067 (2) | 0.0396 (18) | 0.063 (2) | −0.0177 (17) | −0.0033 (18) | 0.0037 (16) |
C4 | 0.0350 (17) | 0.0418 (18) | 0.068 (2) | 0.0017 (14) | −0.0067 (15) | 0.0060 (16) |
C5 | 0.054 (2) | 0.045 (2) | 0.084 (3) | −0.0157 (17) | −0.007 (2) | 0.019 (2) |
C6 | 0.0363 (16) | 0.0450 (18) | 0.0523 (19) | −0.0070 (13) | −0.0070 (14) | −0.0104 (14) |
C7 | 0.0410 (18) | 0.0476 (19) | 0.065 (2) | −0.0199 (15) | −0.0026 (15) | −0.0033 (16) |
C8 | 0.0481 (19) | 0.0377 (17) | 0.059 (2) | −0.0153 (14) | −0.0053 (15) | 0.0011 (15) |
C9 | 0.0374 (16) | 0.0399 (16) | 0.0516 (18) | −0.0112 (13) | −0.0096 (14) | −0.0039 (14) |
C10 | 0.0406 (18) | 0.0445 (18) | 0.070 (2) | −0.0198 (15) | −0.0090 (16) | 0.0027 (16) |
C11 | 0.057 (2) | 0.077 (3) | 0.061 (2) | 0.011 (2) | −0.0061 (19) | 0.003 (2) |
C12 | 0.082 (3) | 0.061 (3) | 0.060 (3) | −0.015 (2) | −0.001 (2) | 0.005 (2) |
C13 | 0.073 (3) | 0.061 (2) | 0.063 (3) | −0.013 (2) | −0.003 (2) | 0.009 (2) |
C14 | 0.055 (2) | 0.061 (2) | 0.075 (3) | −0.0069 (19) | −0.003 (2) | 0.011 (2) |
C15 | 0.091 (4) | 0.072 (3) | 0.081 (3) | −0.005 (3) | 0.001 (3) | 0.021 (3) |
C16 | 0.063 (3) | 0.075 (3) | 0.068 (3) | −0.009 (2) | −0.006 (2) | −0.029 (2) |
C17 | 0.061 (3) | 0.083 (3) | 0.096 (3) | −0.030 (2) | −0.001 (2) | −0.029 (3) |
C18 | 0.072 (3) | 0.059 (2) | 0.084 (3) | −0.023 (2) | −0.002 (2) | −0.014 (2) |
C19 | 0.057 (2) | 0.059 (2) | 0.059 (2) | −0.0137 (18) | −0.0014 (18) | −0.0117 (18) |
C20 | 0.062 (3) | 0.061 (2) | 0.082 (3) | −0.018 (2) | −0.004 (2) | −0.005 (2) |
S1—C4 | 1.781 (4) | C1—C2 | 1.372 (5) |
S1—S2 | 2.0275 (15) | C2—C3 | 1.367 (6) |
S2—C6 | 1.781 (3) | C2—H2 | 0.93 |
S3—C11 | 1.768 (5) | C3—C4 | 1.368 (5) |
S3—S4 | 2.023 (2) | C3—H3 | 0.93 |
S4—C16 | 1.784 (5) | C5—H5 | 0.93 |
O1—N1 | 1.213 (4) | C6—C7 | 1.387 (5) |
O2—N1 | 1.205 (5) | C7—C8 | 1.363 (5) |
O3—N4 | 1.200 (4) | C7—H7 | 0.93 |
O4—N4 | 1.211 (4) | C8—C9 | 1.376 (4) |
O5—N5 | 1.223 (5) | C8—H8 | 0.93 |
O6—N5 | 1.204 (5) | C9—C10 | 1.366 (4) |
O7—N8 | 1.213 (5) | C10—H10 | 0.93 |
O8—N8 | 1.204 (5) | C11—C12 | 1.371 (6) |
N1—C1 | 1.464 (6) | C12—C13 | 1.360 (6) |
N2—C4 | 1.334 (5) | C12—H12 | 0.93 |
N2—C5 | 1.342 (6) | C13—C14 | 1.369 (6) |
N3—C6 | 1.329 (4) | C13—H13 | 0.93 |
N3—C10 | 1.333 (4) | C14—C15 | 1.358 (7) |
N4—C9 | 1.464 (4) | C15—H15 | 0.93 |
N5—C14 | 1.463 (6) | C16—C17 | 1.393 (6) |
N6—C15 | 1.317 (8) | C17—C18 | 1.351 (6) |
N6—C11 | 1.343 (6) | C17—H17 | 0.93 |
N7—C20 | 1.329 (6) | C18—C19 | 1.369 (6) |
N7—C16 | 1.329 (6) | C18—H18 | 0.93 |
N8—C19 | 1.455 (6) | C19—C20 | 1.365 (5) |
C1—C5 | 1.365 (6) | C20—H20 | 0.93 |
C4—S1—S2 | 104.06 (13) | C6—C7—H7 | 120.6 |
C6—S2—S1 | 103.36 (12) | C7—C8—C9 | 117.4 (3) |
C11—S3—S4 | 104.51 (17) | C7—C8—H8 | 121.3 |
C16—S4—S3 | 104.02 (18) | C9—C8—H8 | 121.3 |
O2—N1—O1 | 123.3 (4) | C10—C9—C8 | 120.9 (3) |
O2—N1—C1 | 118.6 (3) | C10—C9—N4 | 119.0 (3) |
O1—N1—C1 | 118.2 (4) | C8—C9—N4 | 120.0 (3) |
C4—N2—C5 | 117.4 (3) | N3—C10—C9 | 122.0 (3) |
C6—N3—C10 | 117.2 (3) | N3—C10—H10 | 119 |
O3—N4—O4 | 123.5 (3) | C9—C10—H10 | 119 |
O3—N4—C9 | 118.3 (3) | N6—C11—C12 | 122.5 (5) |
O4—N4—C9 | 118.1 (3) | N6—C11—S3 | 111.9 (4) |
O6—N5—O5 | 123.8 (5) | C12—C11—S3 | 125.6 (4) |
O6—N5—C14 | 118.2 (4) | C13—C12—C11 | 118.5 (4) |
O5—N5—C14 | 117.9 (4) | C13—C12—H12 | 120.8 |
C15—N6—C11 | 118.0 (4) | C11—C12—H12 | 120.8 |
C20—N7—C16 | 116.7 (4) | C12—C13—C14 | 119.0 (4) |
O8—N8—O7 | 123.4 (5) | C12—C13—H13 | 120.5 |
O8—N8—C19 | 119.3 (4) | C14—C13—H13 | 120.5 |
O7—N8—C19 | 117.3 (4) | C15—C14—C13 | 119.5 (5) |
C5—C1—C2 | 119.9 (4) | C15—C14—N5 | 120.6 (5) |
C5—C1—N1 | 120.7 (3) | C13—C14—N5 | 119.9 (4) |
C2—C1—N1 | 119.4 (4) | N6—C15—C14 | 122.5 (5) |
C3—C2—C1 | 119.1 (4) | N6—C15—H15 | 118.7 |
C3—C2—H2 | 120.5 | C14—C15—H15 | 118.7 |
C1—C2—H2 | 120.5 | N7—C16—C17 | 123.7 (4) |
C2—C3—C4 | 117.8 (3) | N7—C16—S4 | 119.9 (4) |
C2—C3—H3 | 121.1 | C17—C16—S4 | 116.5 (4) |
C4—C3—H3 | 121.1 | C18—C17—C16 | 118.5 (4) |
N2—C4—C3 | 124.1 (4) | C18—C17—H17 | 120.8 |
N2—C4—S1 | 111.2 (3) | C16—C17—H17 | 120.8 |
C3—C4—S1 | 124.7 (3) | C17—C18—C19 | 118.2 (4) |
N2—C5—C1 | 121.7 (3) | C17—C18—H18 | 120.9 |
N2—C5—H5 | 119.2 | C19—C18—H18 | 120.9 |
C1—C5—H5 | 119.2 | C20—C19—C18 | 120.4 (4) |
N3—C6—C7 | 123.6 (3) | C20—C19—N8 | 120.0 (4) |
N3—C6—S2 | 119.2 (3) | C18—C19—N8 | 119.5 (4) |
C7—C6—S2 | 117.3 (2) | N7—C20—C19 | 122.6 (4) |
C8—C7—C6 | 118.8 (3) | N7—C20—H20 | 118.7 |
C8—C7—H7 | 120.6 | C19—C20—H20 | 118.7 |
C4—S1—S2—C6 | −80.13 (16) | N4—C9—C10—N3 | 179.7 (3) |
C11—S3—S4—C16 | −79.8 (2) | C15—N6—C11—C12 | 0.5 (7) |
O2—N1—C1—C5 | 174.8 (4) | C15—N6—C11—S3 | −177.8 (4) |
O1—N1—C1—C5 | −5.3 (5) | S4—S3—C11—N6 | −177.7 (3) |
O2—N1—C1—C2 | −4.4 (6) | S4—S3—C11—C12 | 4.1 (4) |
O1—N1—C1—C2 | 175.5 (4) | N6—C11—C12—C13 | −0.2 (7) |
C5—C1—C2—C3 | 1.8 (6) | S3—C11—C12—C13 | 177.9 (4) |
N1—C1—C2—C3 | −179.0 (4) | C11—C12—C13—C14 | −0.6 (7) |
C1—C2—C3—C4 | −1.2 (6) | C12—C13—C14—C15 | 1.1 (7) |
C5—N2—C4—C3 | 1.1 (5) | C12—C13—C14—N5 | −178.0 (4) |
C5—N2—C4—S1 | −179.4 (3) | O6—N5—C14—C15 | 167.0 (5) |
C2—C3—C4—N2 | −0.2 (6) | O5—N5—C14—C15 | −10.7 (7) |
C2—C3—C4—S1 | −179.7 (3) | O6—N5—C14—C13 | −13.9 (6) |
S2—S1—C4—N2 | 173.4 (2) | O5—N5—C14—C13 | 168.3 (4) |
S2—S1—C4—C3 | −7.1 (3) | C11—N6—C15—C14 | −0.1 (8) |
C4—N2—C5—C1 | −0.5 (6) | C13—C14—C15—N6 | −0.7 (8) |
C2—C1—C5—N2 | −0.9 (6) | N5—C14—C15—N6 | 178.4 (5) |
N1—C1—C5—N2 | 179.9 (3) | C20—N7—C16—C17 | −0.3 (7) |
C10—N3—C6—C7 | 0.6 (5) | C20—N7—C16—S4 | 177.3 (3) |
C10—N3—C6—S2 | −179.4 (3) | S3—S4—C16—N7 | 9.5 (4) |
S1—S2—C6—N3 | 6.6 (3) | S3—S4—C16—C17 | −172.8 (3) |
S1—S2—C6—C7 | −173.5 (3) | N7—C16—C17—C18 | 0.1 (7) |
N3—C6—C7—C8 | −0.4 (6) | S4—C16—C17—C18 | −177.6 (4) |
S2—C6—C7—C8 | 179.6 (3) | C16—C17—C18—C19 | −0.1 (7) |
C6—C7—C8—C9 | 0.1 (5) | C17—C18—C19—C20 | 0.4 (7) |
C7—C8—C9—C10 | −0.1 (5) | C17—C18—C19—N8 | 179.2 (4) |
C7—C8—C9—N4 | −179.5 (3) | O8—N8—C19—C20 | 164.9 (4) |
O3—N4—C9—C10 | −5.0 (6) | O7—N8—C19—C20 | −16.6 (7) |
O4—N4—C9—C10 | 175.6 (4) | O8—N8—C19—C18 | −14.0 (7) |
O3—N4—C9—C8 | 174.3 (4) | O7—N8—C19—C18 | 164.5 (5) |
O4—N4—C9—C8 | −5.0 (5) | C16—N7—C20—C19 | 0.5 (7) |
C6—N3—C10—C9 | −0.6 (5) | C18—C19—C20—N7 | −0.6 (7) |
C8—C9—C10—N3 | 0.4 (6) | N8—C19—C20—N7 | −179.5 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···S2 | 0.93 | 2.68 | 3.173 (4) | 114 |
C8—H8···O1i | 0.93 | 2.44 | 3.098 (5) | 127 |
C12—H12···S4 | 0.93 | 2.70 | 3.189 (5) | 113 |
C18—H18···O5i | 0.93 | 2.50 | 3.171 (6) | 129 |
Symmetry code: (i) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | C10H6N4O4S2 |
Mr | 310.31 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 298 |
a, b, c (Å) | 7.7832 (12), 11.8515 (11), 14.513 (2) |
α, β, γ (°) | 82.353 (4), 82.095 (5), 72.460 (9) |
V (Å3) | 1258.4 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.44 |
Crystal size (mm) | 0.20 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Nonius KappaCCD area-detector |
Absorption correction | Multi-scan (SORTAV; Blessing, 1995) |
Tmin, Tmax | 0.937, 0.948 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11205, 4931, 4101 |
Rint | 0.062 |
(sin θ/λ)max (Å−1) | 0.628 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.088, 0.209, 1.16 |
No. of reflections | 4931 |
No. of parameters | 362 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.33, −0.28 |
Computer programs: COLLECT (Nonius, 1998), DENZO-SMN (Otwinowski & Minor, 1997), SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 1997), ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2003), WinGX (Farrugia, 1999).
C4—S1—S2—C6 | −80.13 (16) | S1—S2—C6—C7 | −173.5 (3) |
C11—S3—S4—C16 | −79.8 (2) | S4—S3—C11—N6 | −177.7 (3) |
S2—S1—C4—N2 | 173.4 (2) | S4—S3—C11—C12 | 4.1 (4) |
S2—S1—C4—C3 | −7.1 (3) | S3—S4—C16—N7 | 9.5 (4) |
S1—S2—C6—N3 | 6.6 (3) | S3—S4—C16—C17 | −172.8 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···S2 | 0.93 | 2.68 | 3.173 (4) | 114 |
C8—H8···O1i | 0.93 | 2.44 | 3.098 (5) | 127 |
C12—H12···S4 | 0.93 | 2.70 | 3.189 (5) | 113 |
C18—H18···O5i | 0.93 | 2.50 | 3.171 (6) | 129 |
Symmetry code: (i) x, y−1, z. |
Acknowledgements
This work was supported by a grant from the Universidad de Antofagasta (DI-1324-06). The authors thank the Spanish Research Council (CSIC) for the provision of a free-of-charge licence for the Cambridge Structural Database. AM thanks the Universidad de Antofagasta for a PhD fellowship.
References
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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.
This paper forms part of our continuing study of the synthesis and structural characterization of divalent sulfur compounds (Brito et al., 2007 and references therein). We are particularly interested in the utility of the title compound of as flexible ligand, and its binding modes, for the fabrication of different coordination polymers topologies. We report here the structure of a new polymorph of 5,5'-Dinitro-2,2'-dithiodipyridine isolated during attempts to synthetize coordination polymers with silver trifluoromethanesulfonate of the ligand (Fig. 1, Table 1). The bond lenghts and the conformation are significantly different from those found in the monoclinic modification (Brito et al., 2007). The observed difference between (I) and the previously reported polymorph is in the torsion angle C—S—S—C [80.0 (2) and 0°, respectively]. A database survey of C—S—S—C fragments (Allen et al., 1987) found that S—S bond distances are bimodally distributed: for torsion angles in the ranges 75–105 and 0–20°, the mean S—S bond distances are 2.031 (15) and 2.070 (22) Å, respectively. The corresponding value in the title compound is 2.025 (2) Å and 2.0719 (11) Å for the previously polymorph placing it in the lower quartile for Allen's first set. In both polymorphs the torsion angles X—C—S—S (where X=N or C) are close to 0 or 180° and within the range found in other substituted aromatic disulfides with an equatorial conformation according to the Shefter classification (Shefter, 1970).
The molecular conformations are dominated by near orthogonality of the lone pairs on the two adjacent S atoms (Glidewell et al., 2000). The molecular packing in the title compound is completely different from that of the monoclinic polymorph. Only in the triclinic form the phenyl rings participant in significant intramolecular C—H···S interactions with average H···S distances of 2.69 Å. These interactions may stabilize the conformation adopted by the molecules in the solid state (Fig. 1). The molecules are linked into chains by two intermolecular C—H···O hydrogen bond. Atoms C8 and C18 in the molecules at (x,y,z) acts as hydrogen bonds donor vía atom H8 and H18 to atoms O1 and O5 in the molecule at (x,-1 + y,z) respectively, so generating by translation two C(12) chains running parallel to [010] direction (Bernstein et al., 1995), (Fig. 2, Table 2). The triclinic modification is much less compact, as noted from the lower density (1.638 Mg m-3 compared with 1.725 Mg m-3 for the monoclinic form).