research communications
Crystal structures of N′-aminopyridine-2-carboximidamide and N′-{[1-(pyridin-2-yl)ethylidene]amino}pyridine-2-carboximidamide
aDepartment of Pharmaceutical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, PO Box 2701, Cameroon, bChemistry, School of Mathematics and Physical Sciences, University of Hull, HU6 7RX, England, and cDepartment of Chemistry, University of Douala, PO Box 24157, Cameroon
*Correspondence e-mail: mevae@daad-alumni.de
The crystal structures of N′-aminopyridine-2-carboximidamide (C6H8N4), 1, and N′-{[1-(pyridin-2-yl)ethylidene]amino}pyridine-2-carboximidamide (C13H13N5), 2, are described. The non-H atoms in compound 1 are nearly planar (r.m.s. deviation from planarity = 0.0108 Å), while 2 is twisted about the central N—N bond by 17.8 (2)°. Both molecules are linked by intermolecular N—H⋯N hydrogen-bonding interactions; 1 forms a two-dimensional hydrogen-bonding network and for 2 the network is a one-dimensional chain. The bond lengths of these molecules are similar to those in other literature reports of azine and diimine systems.
1. Chemical context
The preparation of RC(=NH)NHNH2 is accomplished by the action of hydrazine on the corresponding thioamide, imido ether or nitrile (Case, 1965). A pyridine-2-carboxamidrazide form has previously been crystallized as a pyridine-2-carboxamidrazonium hydrogenoxalate salt, obtained by the reaction of pyridine-2-carboxamidrazide with oxalic acid (Wang et al., 2007). Related molecules with diazine (N—N) bridges, obtained by condensation of with can bring two metal centres into close proximity and provide an intramolecular exchange pathway for spin-exchange interactions via the p-orbital system (σ pathway) of the heterocyclic ligand (Xu et al., 1997, 2000). The latter type of molecules present an unusual arrangement of potential donor sites, with many possible mononucleating and dinucleating coordination modes (Xu et al., 1997). Semi-empirical structural calculations demonstrate that the N—N bond in these is rotationally soft, thereby allowing significant twisting at little energy cost (Kesslen et al., 1999). Copper azine and imine complexes possess a significant antimalarial and antitumor action (Gokhale et al., 2001a,b, 2003). Coordination complexes of 2-acetylpyridine-pyridine-2-carboxamidrazone have been obtained with cadmium(II), copper(II), nickel(II) and manganese(II) ions. The organic molecule behaves as a mono- and bis(bidentate) chelator (Xu et al., 2000; Gokhale et al., 2001a; Yue et al., 2004, 2006). A polymorph of 2-acetylpyridine-pyridine-2-carboxamidrazone as been obtained with two crystallographically independent molecules included in the (Yue et al., 2006).
with the general formula2. Structural commentary
The molecular structure of 1 is shown in Fig. 1. The molecule is close to planar; the r.m.s. deviation of non-hydrogen atoms from planarity is 0.0108 Å with atom N2 displaying the largest deviation from the mean plane of 0.016 (3) Å. The geometry about N2 and N4 is not planar. H2A and H2B lie 0.12 (6) and 0.24 (6) Å out of the mean plane of non-hydrogen atoms. For H4A and H4B, the deviation is even greater at 0.37 (5) and 0.54 (5) Å from the mean plane. Rotation of the non-planar NH2 group, particularly for N4, facilitates hydrogen bonding to other molecules. The N—N single bond length in 1 [1.424 (5) Å] is slightly shorter than that in the free hydrazine (1.449 Å).
The molecular structure of 2 is shown in Fig. 2. The molecule is not planar, perhaps as a result of conjunction of supramolecular interactions and packing effects. Each of the two ring systems is essentially planar (r.m.s. deviations for the two six-membered rings are 0.0162 and 0.0057 Å for N1/C1–C5 and N5/C9–C13, respectively). The hydrazidine group N3/C8/N4 is rotated slightly away from the plane of the six-membered ring along the C8—C9 bond by 8.6 (3)°. The imine group N2/C6/C7 is rotated from the plane of the adjacent six-membered ring by rotation about C5—C6 by 14.5 (2)°. The molecule is further distorted away from planarity by rotation of 17.8 (2)° about the central N2—N3 bond.
The bond lengths indicate that within the central chain of the molecule, the C6—N2 and C8—N3 linkages have largely double-bond character. The azine linkages are in the E,E conformation, suggesting conjugation throughout the π systems. The C6—N2—N3 and C8—N3—N2 angles of 115.5 (2)° and 110.57 (19)°, respectively are significantly below the ideal sp2 value of 120°, a consequence of the repulsion between the nitrogen lone pair and the adjacent bonds. The C6—N2—N3—C8 torsion angle is −162.2 (2)°. This large deviation from planarity has two consequences. First, there is a loss of conjugation between the imine bonds across the azine bond, reflected in the shorter imine bond length. The torsion also leads to a shorter N2—N3 bond length [1.408 (3) Å] compared to that observed for 1 [1.424 (5) Å]. Finally, a short intramolecular contact between N3i and H4B, 2.42 (3) Å, may add a favorable electrostatic contribution to the stability of this conformation. Notably, there is minimal change in the bond lengths within the ligands when a first row transition metal ion is bound. When the ligand chelates to a metal ion through both N3 and N5, only the bond length C8—N4 changes significantly, becoming shorter on binding.
3. Supramolecular features
There are two molecules of 1 in each and these are related by the screw axis. Curiously, N1 does not act as a hydrogen-bond acceptor. H2A is also not involved with the formation of any (short) classical hydrogen bonds. H2B forms a hydrogen bond to N4i [symmetry code: (i) 1 – x, y + , 1 – z]. This is augmented by the longer hydrogen bond N4—H4B⋯N4i. N4—H4A forms a hydrogen bond to N3ii [symmetry code: (ii) –x, y + , –z + 1]. These three sets of hydrogen bonds (Table 1) are sufficient to hold pairs of molecules together within the and to knit these dimers together to form sheets in the xy plane (see Fig. 3). These sheets then stack parallel to the [001] direction, presumably held together by van der Waals interactions.
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The classical hydrogen bonding (Table 2) in 2 is more sparse than in 1. N1, N2, and N5 do not act as classical hydrogen-bond acceptors. A single symmetry-independent hydrogen bond [N4—H4B⋯N3i [symmetry code: (i) 1/2 – x, 1 – y, z – 1/2] is present and this knits the molecules of 2 together to form hydrogen-bonded chains along the [001] direction, as shown in Fig. 4. There are subsidiary short C—H⋯N(pyridine) distances suggestive of intermolecular interactions.
4. Database survey
For literature on N′-aminopyridine-2-carboximidamide and related molecules, see Case et al. (1965). For the synthesis of N′-{[1-(pyridin-2-yl)ethylidene]amino}pyridine-2-carboximidamide and analogues, see Gokhale et al. (2001a,b, 2003) and Xu et al. (1997, 2000). For the coordination chemistry of N′-aminopyridine-2-carboximidamide, see Xu et al. (2000), Gokhale et al. (2001a) and Yue et al. (2004, 2006).
5. Synthesis and crystallization
The synthesis of N′-aminopyridine-2-carboximidamide and N′-{[1-(pyridin-2-yl)ethylidene]amino}pyridine-2-carboximidamide is depicted in Fig. 5.
N′-Aminopyridine-2-carboximidamide (1) was prepared by an analogy of the procedure published by Case (1965) with some modifications. A mixture of 2-cyanopyridine (0.05 mol), absolute ethanol (9 ml), and 95% hydrazine (15 ml) was stirred at room temperature for 2 h. The solid product was then dried under vacuum and recrystallized from benzene. N′-{[1-(Pyridin-2-yl)ethylidene]amino}pyridine-2-carboximidamide (2) was synthesized by an analogy of the procedure published by Gokhale et al. (2001a) by refluxing pyridine-2-carboxamidrazide (1) (0.5 g, 3.6 mmol) with excess 2-acetyl pyridine (0.5 g, 4.1 mmol) in absolute ethanol (20 ml) for 2 h. On cooling the product separates out in one week as yellow crystals which were filtered and dried.
6. Refinement
Crystal data, data collection and structure .
details are summarized in Table 3There is no significant
at this wavelength so the is meaningless and this is not reported.For compound 1, hydrogen atoms of the aromatic ring were placed using a riding model with the C—H bond length allowed to refine subject to the restraint that all these bond lengths were equal within a estimated standard deviation of 0.02 Å. These C—H bond lengths lie in the range 0.97 (3) to 0.99 (3) Å. The other hydrogen atoms attached to formally single-bonded nitrogen atoms were freely refined subject to sensible distance and angle restraints. The N—H distances lie in the range 0.94 (3)-0.95 (3) Å.
For compound 2, hydrogen atoms were placed using a riding model [N—H = 0.88, C—H = 0.95–0.98 Å; Uiso(H) = 1.2 or 1.5Ueq(C)].
Supporting information
https://doi.org/10.1107/S2056989017008416/nk2236sup1.cif
contains datablocks 1, 2. DOI:Structure factors: contains datablock 1. DOI: https://doi.org/10.1107/S2056989017008416/nk22361sup2.hkl
Structure factors: contains datablock 2. DOI: https://doi.org/10.1107/S2056989017008416/nk22362sup3.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989017008416/nk22361sup4.cdx
Supporting information file. DOI: https://doi.org/10.1107/S2056989017008416/nk22362sup5.cdx
Supporting information file. DOI: https://doi.org/10.1107/S2056989017008416/nk22361sup6.cml
Supporting information file. DOI: https://doi.org/10.1107/S2056989017008416/nk22362sup7.cml
For both compounds, data collection: X-AREA (Stoe & Cie, 2005); cell
X-AREA (Stoe & Cie, 2005). Data reduction: scaled and merged with SORTAV (Blessing, 1987, 1989) for (1); X-AREA (Stoe & Cie, 2005) for (2). For both compounds, program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015b); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015b).C6H8N4 | F(000) = 144 |
Mr = 136.16 | Dx = 1.417 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.71073 Å |
a = 5.6955 (14) Å | Cell parameters from 2199 reflections |
b = 3.8408 (5) Å | θ = 5.5–28.6° |
c = 14.592 (4) Å | µ = 0.10 mm−1 |
β = 91.631 (19)° | T = 150 K |
V = 319.08 (12) Å3 | Block, colourless |
Z = 2 | 0.48 × 0.21 × 0.20 mm |
Stoe IPDS2 diffractometer | 1407 independent reflections |
Radiation source: fine-focus sealed tube | 806 reflections with I > 2σ(I) |
Detector resolution: 6.67 pixels mm-1 | Rint = 0.079 |
ω–scan | θmax = 29.3°, θmin = 2.8° |
Absorption correction: multi-scan (SORTAV; Blessing, 1995) | h = −7→6 |
Tmin = 0.909, Tmax = 0.963 | k = −4→5 |
2271 measured reflections | l = −20→19 |
Refinement on F2 | 12 restraints |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.072 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.193 | w = 1/[σ2(Fo2) + (0.1122P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.87 | (Δ/σ)max < 0.001 |
1407 reflections | Δρmax = 0.30 e Å−3 |
109 parameters | Δρmin = −0.37 e Å−3 |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.3776 (8) | 0.3892 (13) | 0.8928 (3) | 0.0457 (11) | |
H1 | 0.494 (4) | 0.4064 (14) | 0.9427 (17) | 0.055* | |
C2 | 0.1680 (8) | 0.2331 (13) | 0.9109 (3) | 0.0464 (11) | |
H2 | 0.1358 (13) | 0.143 (3) | 0.973 (2) | 0.056* | |
C3 | 0.0007 (9) | 0.2040 (13) | 0.8396 (3) | 0.0462 (11) | |
H3 | −0.152 (5) | 0.092 (4) | 0.8496 (4) | 0.055* | |
C4 | 0.0545 (8) | 0.3357 (12) | 0.7545 (3) | 0.0423 (11) | |
H4 | −0.060 (4) | 0.3176 (14) | 0.7027 (17) | 0.051* | |
C5 | 0.2711 (7) | 0.4937 (12) | 0.7426 (3) | 0.0391 (9) | |
C6 | 0.3370 (7) | 0.6479 (12) | 0.6539 (3) | 0.0369 (9) | |
N1 | 0.4337 (6) | 0.5206 (10) | 0.8109 (2) | 0.0435 (10) | |
N2 | 0.5525 (7) | 0.7974 (11) | 0.6517 (2) | 0.0443 (10) | |
N3 | 0.1844 (6) | 0.6252 (9) | 0.5862 (2) | 0.0389 (9) | |
N4 | 0.2585 (6) | 0.7713 (12) | 0.5022 (2) | 0.0422 (9) | |
H4A | 0.125 (7) | 0.840 (13) | 0.466 (3) | 0.063* | |
H2A | 0.637 (8) | 0.830 (16) | 0.708 (2) | 0.063* | |
H2B | 0.614 (7) | 0.954 (13) | 0.608 (2) | 0.063* | |
H4B | 0.353 (7) | 0.970 (12) | 0.512 (3) | 0.065* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.046 (3) | 0.041 (3) | 0.050 (2) | 0.002 (2) | 0.0008 (18) | 0.000 (2) |
C2 | 0.050 (3) | 0.036 (3) | 0.053 (2) | 0.006 (2) | 0.0041 (19) | 0.0020 (19) |
C3 | 0.042 (2) | 0.037 (3) | 0.060 (2) | 0.003 (2) | 0.0060 (18) | 0.0037 (18) |
C4 | 0.035 (2) | 0.035 (3) | 0.056 (2) | −0.001 (2) | 0.0017 (18) | −0.0012 (19) |
C5 | 0.035 (2) | 0.031 (2) | 0.051 (2) | 0.007 (2) | −0.0021 (16) | −0.0032 (17) |
C6 | 0.030 (2) | 0.029 (2) | 0.052 (2) | 0.0006 (19) | 0.0007 (16) | −0.0010 (17) |
N1 | 0.041 (2) | 0.037 (2) | 0.0518 (19) | 0.0003 (19) | 0.0005 (14) | 0.0001 (16) |
N2 | 0.039 (2) | 0.041 (2) | 0.0528 (19) | −0.0051 (19) | 0.0004 (15) | 0.0007 (17) |
N3 | 0.0346 (18) | 0.033 (2) | 0.0486 (18) | 0.0019 (17) | 0.0014 (14) | −0.0004 (16) |
N4 | 0.041 (2) | 0.038 (2) | 0.0469 (17) | −0.0008 (19) | 0.0006 (14) | 0.0039 (16) |
C1—N1 | 1.345 (6) | C5—N1 | 1.345 (5) |
C1—C2 | 1.368 (7) | C5—C6 | 1.481 (5) |
C1—H1 | 0.97 (3) | C6—N3 | 1.300 (5) |
C2—C3 | 1.395 (7) | C6—N2 | 1.357 (6) |
C2—H2 | 0.99 (3) | N2—H2A | 0.95 (3) |
C3—C4 | 1.383 (6) | N2—H2B | 0.95 (3) |
C3—H3 | 0.98 (3) | N3—N4 | 1.424 (5) |
C4—C5 | 1.390 (6) | N4—H4A | 0.95 (3) |
C4—H4 | 0.99 (3) | N4—H4B | 0.94 (3) |
N1—C1—C2 | 124.5 (4) | N1—C5—C6 | 115.5 (4) |
N1—C1—H1 | 117.8 | C4—C5—C6 | 122.1 (4) |
C2—C1—H1 | 117.8 | N3—C6—N2 | 126.6 (4) |
C1—C2—C3 | 118.2 (4) | N3—C6—C5 | 117.2 (4) |
C1—C2—H2 | 120.9 | N2—C6—C5 | 116.2 (3) |
C3—C2—H2 | 120.9 | C1—N1—C5 | 117.0 (4) |
C4—C3—C2 | 118.4 (4) | C6—N2—H2A | 118 (3) |
C4—C3—H3 | 120.8 | C6—N2—H2B | 129 (2) |
C2—C3—H3 | 120.8 | H2A—N2—H2B | 108 (3) |
C3—C4—C5 | 119.5 (4) | C6—N3—N4 | 114.8 (4) |
C3—C4—H4 | 120.3 | N3—N4—H4A | 110 (3) |
C5—C4—H4 | 120.3 | N3—N4—H4B | 111 (3) |
N1—C5—C4 | 122.4 (4) | H4A—N4—H4B | 108 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2B···N4i | 0.95 (3) | 2.16 (3) | 3.106 (5) | 174 (4) |
N4—H4B···N4i | 0.94 (3) | 2.51 (3) | 3.357 (6) | 149 (4) |
N4—H4A···N3ii | 0.95 (3) | 2.19 (4) | 3.113 (5) | 162 (4) |
Symmetry codes: (i) −x+1, y+1/2, −z+1; (ii) −x, y+1/2, −z+1. |
C13H13N5 | Dx = 1.300 Mg m−3 |
Mr = 239.28 | Mo Kα radiation, λ = 0.71073 Å |
Orthorhombic, P212121 | Cell parameters from 3070 reflections |
a = 6.6899 (5) Å | θ = 2.2–27.9° |
b = 18.930 (2) Å | µ = 0.08 mm−1 |
c = 9.6561 (11) Å | T = 150 K |
V = 1222.8 (2) Å3 | Block, yellow |
Z = 4 | 0.50 × 0.30 × 0.30 mm |
F(000) = 504 |
Stoe IPDS2 diffractometer | 1881 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.060 |
Detector resolution: 6.67 pixels mm-1 | θmax = 29.3°, θmin = 2.2° |
ω–scan | h = −7→9 |
4734 measured reflections | k = −22→25 |
3172 independent reflections | l = −13→9 |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.040 | H-atom parameters constrained |
wR(F2) = 0.085 | w = 1/[σ2(Fo2) + (0.0355P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.83 | (Δ/σ)max < 0.001 |
3172 reflections | Δρmax = 0.13 e Å−3 |
164 parameters | Δρmin = −0.17 e Å−3 |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.8155 (4) | 0.19604 (14) | 0.7310 (3) | 0.0423 (6) | |
H1 | 0.8311 | 0.1496 | 0.7666 | 0.051* | |
C2 | 0.9604 (4) | 0.22137 (15) | 0.6439 (3) | 0.0410 (6) | |
H2 | 1.0716 | 0.1929 | 0.6189 | 0.049* | |
C3 | 0.9409 (4) | 0.28972 (15) | 0.5928 (3) | 0.0399 (6) | |
H3 | 1.0393 | 0.3092 | 0.5331 | 0.048* | |
C4 | 0.7756 (4) | 0.32843 (13) | 0.6309 (3) | 0.0338 (6) | |
H4 | 0.7596 | 0.3754 | 0.5981 | 0.041* | |
C5 | 0.6314 (4) | 0.29863 (12) | 0.7179 (2) | 0.0294 (5) | |
C6 | 0.4460 (4) | 0.33685 (11) | 0.7576 (2) | 0.0292 (5) | |
C7 | 0.3185 (4) | 0.30756 (13) | 0.8722 (3) | 0.0352 (6) | |
H7A | 0.2303 | 0.3447 | 0.9076 | 0.053* | |
H7B | 0.4045 | 0.2904 | 0.9472 | 0.053* | |
H7C | 0.2377 | 0.2684 | 0.8365 | 0.053* | |
C8 | 0.1767 (4) | 0.47107 (12) | 0.6220 (3) | 0.0289 (5) | |
C9 | −0.0076 (4) | 0.51400 (12) | 0.6439 (2) | 0.0287 (5) | |
C10 | −0.1320 (4) | 0.50366 (13) | 0.7570 (3) | 0.0350 (6) | |
H10 | −0.1022 | 0.4685 | 0.8240 | 0.042* | |
C11 | −0.3006 (4) | 0.54571 (14) | 0.7701 (3) | 0.0405 (6) | |
H11 | −0.3877 | 0.5401 | 0.8470 | 0.049* | |
C12 | −0.3401 (4) | 0.59572 (14) | 0.6701 (3) | 0.0390 (6) | |
H12 | −0.4544 | 0.6253 | 0.6767 | 0.047* | |
C13 | −0.2093 (4) | 0.60183 (14) | 0.5600 (3) | 0.0382 (6) | |
H13 | −0.2371 | 0.6365 | 0.4915 | 0.046* | |
N1 | 0.6516 (3) | 0.23293 (11) | 0.7696 (2) | 0.0361 (5) | |
N2 | 0.4076 (3) | 0.39235 (11) | 0.6850 (2) | 0.0312 (5) | |
N3 | 0.2326 (3) | 0.42907 (10) | 0.7220 (2) | 0.0312 (5) | |
N4 | 0.2661 (3) | 0.47642 (11) | 0.4976 (2) | 0.0396 (5) | |
H4A | 0.3712 | 0.4503 | 0.4786 | 0.048* | |
H4B | 0.2193 | 0.5061 | 0.4354 | 0.048* | |
N5 | −0.0458 (3) | 0.56182 (11) | 0.5440 (2) | 0.0344 (5) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0446 (16) | 0.0378 (13) | 0.0444 (15) | 0.0104 (13) | −0.0050 (13) | 0.0018 (12) |
C2 | 0.0358 (15) | 0.0472 (15) | 0.0399 (15) | 0.0085 (13) | 0.0000 (13) | −0.0054 (13) |
C3 | 0.0345 (15) | 0.0476 (16) | 0.0376 (15) | −0.0026 (13) | 0.0011 (12) | −0.0038 (12) |
C4 | 0.0354 (14) | 0.0309 (13) | 0.0349 (14) | −0.0025 (11) | −0.0012 (12) | −0.0004 (11) |
C5 | 0.0322 (13) | 0.0266 (12) | 0.0295 (12) | −0.0028 (11) | −0.0045 (11) | −0.0015 (10) |
C6 | 0.0309 (13) | 0.0251 (11) | 0.0315 (13) | −0.0016 (10) | −0.0029 (11) | −0.0024 (10) |
C7 | 0.0347 (14) | 0.0327 (13) | 0.0382 (14) | 0.0020 (12) | 0.0027 (12) | 0.0026 (11) |
C8 | 0.0290 (12) | 0.0251 (12) | 0.0326 (13) | −0.0034 (10) | 0.0001 (11) | −0.0021 (10) |
C9 | 0.0293 (12) | 0.0258 (11) | 0.0310 (12) | −0.0028 (10) | −0.0023 (10) | −0.0008 (10) |
C10 | 0.0350 (13) | 0.0334 (13) | 0.0368 (14) | −0.0022 (11) | 0.0006 (12) | 0.0019 (11) |
C11 | 0.0336 (14) | 0.0454 (15) | 0.0424 (14) | −0.0003 (12) | 0.0072 (13) | −0.0018 (12) |
C12 | 0.0354 (15) | 0.0344 (14) | 0.0472 (16) | 0.0053 (12) | 0.0009 (13) | −0.0013 (12) |
C13 | 0.0397 (15) | 0.0313 (13) | 0.0437 (15) | 0.0032 (13) | −0.0015 (12) | 0.0036 (12) |
N1 | 0.0361 (12) | 0.0324 (11) | 0.0398 (12) | 0.0037 (10) | −0.0019 (10) | 0.0045 (9) |
N2 | 0.0327 (11) | 0.0281 (11) | 0.0326 (11) | 0.0016 (10) | −0.0001 (9) | −0.0009 (9) |
N3 | 0.0296 (11) | 0.0301 (11) | 0.0341 (11) | 0.0013 (9) | 0.0028 (9) | 0.0009 (9) |
N4 | 0.0389 (13) | 0.0462 (13) | 0.0338 (11) | 0.0138 (11) | 0.0048 (10) | 0.0074 (10) |
N5 | 0.0340 (12) | 0.0299 (11) | 0.0392 (12) | 0.0025 (10) | −0.0003 (10) | 0.0023 (9) |
C1—N1 | 1.352 (3) | C8—N3 | 1.305 (3) |
C1—C2 | 1.371 (4) | C8—N4 | 1.346 (3) |
C1—H1 | 0.9500 | C8—C9 | 1.492 (3) |
C2—C3 | 1.391 (4) | C9—N5 | 1.347 (3) |
C2—H2 | 0.9500 | C9—C10 | 1.386 (4) |
C3—C4 | 1.377 (4) | C10—C11 | 1.387 (3) |
C3—H3 | 0.9500 | C10—H10 | 0.9500 |
C4—C5 | 1.398 (3) | C11—C12 | 1.378 (4) |
C4—H4 | 0.9500 | C11—H11 | 0.9500 |
C5—N1 | 1.347 (3) | C12—C13 | 1.381 (4) |
C5—C6 | 1.487 (3) | C12—H12 | 0.9500 |
C6—N2 | 1.289 (3) | C13—N5 | 1.340 (3) |
C6—C7 | 1.503 (3) | C13—H13 | 0.9500 |
C7—H7A | 0.9800 | N2—N3 | 1.408 (3) |
C7—H7B | 0.9800 | N4—H4A | 0.8800 |
C7—H7C | 0.9800 | N4—H4B | 0.8800 |
N1—C1—C2 | 124.2 (3) | N3—C8—C9 | 117.6 (2) |
N1—C1—H1 | 117.9 | N4—C8—C9 | 116.9 (2) |
C2—C1—H1 | 117.9 | N5—C9—C10 | 123.0 (2) |
C1—C2—C3 | 118.5 (3) | N5—C9—C8 | 114.9 (2) |
C1—C2—H2 | 120.8 | C10—C9—C8 | 122.0 (2) |
C3—C2—H2 | 120.8 | C9—C10—C11 | 118.6 (2) |
C4—C3—C2 | 118.4 (3) | C9—C10—H10 | 120.7 |
C4—C3—H3 | 120.8 | C11—C10—H10 | 120.7 |
C2—C3—H3 | 120.8 | C12—C11—C10 | 119.1 (3) |
C3—C4—C5 | 120.0 (2) | C12—C11—H11 | 120.5 |
C3—C4—H4 | 120.0 | C10—C11—H11 | 120.5 |
C5—C4—H4 | 120.0 | C11—C12—C13 | 118.4 (3) |
N1—C5—C4 | 121.7 (2) | C11—C12—H12 | 120.8 |
N1—C5—C6 | 116.0 (2) | C13—C12—H12 | 120.8 |
C4—C5—C6 | 122.3 (2) | N5—C13—C12 | 124.0 (2) |
N2—C6—C5 | 115.0 (2) | N5—C13—H13 | 118.0 |
N2—C6—C7 | 126.0 (2) | C12—C13—H13 | 118.0 |
C5—C6—C7 | 118.9 (2) | C5—N1—C1 | 117.2 (2) |
C6—C7—H7A | 109.5 | C6—N2—N3 | 115.5 (2) |
C6—C7—H7B | 109.5 | C8—N3—N2 | 110.57 (19) |
H7A—C7—H7B | 109.5 | C8—N4—H4A | 120.0 |
C6—C7—H7C | 109.5 | C8—N4—H4B | 120.0 |
H7A—C7—H7C | 109.5 | H4A—N4—H4B | 120.0 |
H7B—C7—H7C | 109.5 | C13—N5—C9 | 116.9 (2) |
N3—C8—N4 | 125.4 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
N4—H4B···N3i | 0.88 | 2.42 | 3.206 (3) | 149 |
Symmetry code: (i) −x+1/2, −y+1, z−1/2. |
Acknowledgements
FEM thanks the Commonwealth Scholarship Commission in the United Kingdom for the generous Academic Fellowship CMCF-2015–3.
Funding information
Funding for this research was provided by: Commonwealth Scholarship Commission (award No. Academic Fellowship CMCF-2015-3).
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