organic compounds
6-Amino-1,3-dimethyl-5-[(E)-2-(methylsulfanyl)benzylideneamino]pyrimidine-2,4(1H,3H)-dione–1,3,7,9-tetramethylpyrimido[5,4-g]pteridine-2,4,6,8-tetrone (1/1)
aUniversity of KwaZulu-Natal, School of Chemistry and Physics, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
*Correspondence e-mail: akermanm@ukzn.ac.za
In the title 12H12N6O4·C14H16N4O2S, both molecules are essentially planar [maximum deviations = 0.129 (1) and 0.097 (1) Å, respectively]. The tricyclic and Schiff base molecules are alternately stacked along the a axis and are linked by π–π interactions with centroid–centroid distances of 3.5170 (16) and 3.6576 (17) Å. An intramolecular C—H⋯O hydrogen bond and a C—H⋯S contact occur in the Schiff base molecule. In the crystal, N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds lead to the formation of a three-dimensional network.
CRelated literature
For the H,3H)-dione and picolinaldehyde, see: Booysen et al. (2011a). For the of the title Schiff base, see: Booysen et al. (2011b). For the of the title tricyclic compound, see: Booysen et al. (2008). For details of the use of the Schiff base N-(2-aminobenzylidene)-5-amino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione as a chelating ligand towards rhenium, see: Mayer et al. (2010). For applications of Schiff base ligands, see: Kumar et al.. 2009.
of a Schiff base derived from 5,6-diamino-1,3-dimethylpyrimidine-2,4(1Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2010); cell SAINT-Plus (Bruker, 2010); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: WinGX (Farrugia, 1999); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S1600536812029716/rz2778sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812029716/rz2778Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812029716/rz2778Isup3.cml
The title compound was prepared from the reaction of [Re(CO5Br] (100 mg, 245 µmol) and 6-amino-1,3-dimethyl-5-[(E)-2-(methylsulfanyl)benzylideneamino]pyrimidine-2,4(1H,3H)-dione (149 mg, 490 µmol) in refluxing toluene (20 cm3) for three hours under nitrogen. X-ray quality yellow crystals were grown from the slow evaporation of the mother liquor.
All non-hydrogen atoms were located in the difference Fourier map and refined anisotropically. The positions of all hydrogen atoms were calculated using the standard riding model of SHELXL97 with C—H(aromatic) distances of 0.93 Å and Uiso = 1.2 Ueq, and C—H(methyl) distances of 0.96 Å and Uiso = 1.5 Ueq. The amine hydrogen atoms were located in the difference Fourier map and allowed to refine isotropically.
Schiff bases and their metal complexes exhibit unique properties which make them favourable for an array of applications such as catalysis and medicinal chemistry (Kumar et al., 2009). Moreover,
have the added advantage of being readily derivatized and their imino nitrogen atoms possess high thermodynamic stability towards various metal centres. In an attempt, to afford a novel rhenium(I) complex containing the Schiff base, C14H16N4O2S, the title compound was unexpectedly isolated. The consists of the Schiff base molecule and a tricyclic molecule, (Fig. 1) which are planar. The tricyclic molecule has been previously isolated by the oxidative deamination of 5,6-diamino-1,3-dimethylpyrimidine-2,4(1H, 3H)-dione by ammonium perrhenate (Booysen et al., 2008).In the Schiff base molecule, the ortho-(thiomethyl) phenyl moiety is nearly co-planar with the 6-amino-1,3-dimethylpyrimidine-2,4(1H, 3H)-dione moiety. The largest deviation from the 21-atom mean plane defined by all non-hydrogen atoms of the Schiff base molecule is 0.097 (1) Å exhibited by the primary amine nitrogen atom. The C7—N1A bond length, 1.282 (4) Å, and the C8A—N1A—C7A bond angle, 124.5 (3)°, emphasize the sp2
of the imino nitrogen atom. An E-configuration is observed for the Schiff base moiety.The tricyclic molecule consists of three fused rings, a central pyrazine ring and two terminal pyrimidine rings. The largest deviation from planarity is shown by the methyl carbon atom C10B, which is displaced by 0.129 (1) Å from the 22-atom mean plane defined by all non-hydrogen atoms. The bond lengths within the pyrazine ring suggest that they are part of a π-delocalized ring system. Thus the N4B and N5B atoms are sp2-hybridized which is confirmed by the bond angles C5B—N5B—C3B [117.2 (2)°] and C6B—N4B—C4B [115.6 (2)°].
The two molecules exhibit π-π interactions. Each tricyclic molecule is sandwiched between two Schiff base molecules. The distance between the centroid of the pyrazine ring, Cg1, and the centroid of the Schiff base phenyl ring, Cg2, within the aysmmetric unit is 3.517 (1) Å. The distance between Cg1 and Cg2 of a symmetry related molecule is 3.658 (1) Å (Figure 2). The is further stablized by a large number of both classical and non-classical hydrogen bonds. These hydrogen bonds are both inter and inramolecular in nature and ultimately link the Schiff base and tricyclic molecules into an infinite, three-dimensional network. Hydrogen bond lengths and angles are summarized in Table 1. The hydrogen bonding pattern is illustrated in Figure 3.
For the
of a Schiff base derived from 5,6-diamino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione and picolinaldehyde, see: Booysen et al. (2011a). For the of C14H16N4O2S, see: Booysen et al. (2011b). For the of C12H12N6O4, see: Booysen et al. (2008). For details of the use of theSchiff base N-(2-aminobenzylidene)-5-amino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione as a chelating ligand towards rhenium, see: Mayer et al. (2010). For applications of Schiff base ligands, see: Kumar et al.. 2009.Data collection: APEX2 (Bruker, 2010); cell
SAINT-Plus (Bruker, 2010); data reduction: SAINT-Plus (Bruker, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: WinGX (Farrugia, 1999); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. The asymmetric unit of the title compound. Displacement ellipsoids have been rendered at the 50% probability level. | |
Fig. 2. The tricyclic molecule sandwiched between two Schiff base molecules. π -π interactions are shown as dashed lines. | |
Fig. 3. Hydrogen bonding between the tricyclic molecule and the Schiff base molecule. |
C12H12N6O4·C14H16N4O2S | F(000) = 1272 |
Mr = 608.64 | Dx = 1.529 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 4076 reflections |
a = 6.8501 (9) Å | θ = 1.6–27.3° |
b = 25.594 (4) Å | µ = 0.19 mm−1 |
c = 15.284 (2) Å | T = 100 K |
β = 99.315 (5)° | Needle, yellow |
V = 2644.3 (7) Å3 | 0.30 × 0.05 × 0.05 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 5846 independent reflections |
Radiation source: fine-focus sealed tube | 4076 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.057 |
ω and φ scans | θmax = 27.3°, θmin = 1.6° |
Absorption correction: multi-scan (SADABS; Bruker 2010) | h = −4→8 |
Tmin = 0.946, Tmax = 0.991 | k = −32→25 |
14953 measured reflections | l = −19→18 |
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)] = 0.060 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.171 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | w = 1/[σ2(Fo2) + (0.0805P)2 + 2.8029P] where P = (Fo2 + 2Fc2)/3 |
5846 reflections | (Δ/σ)max = 0.021 |
403 parameters | Δρmax = 0.42 e Å−3 |
0 restraints | Δρmin = −0.39 e Å−3 |
C12H12N6O4·C14H16N4O2S | V = 2644.3 (7) Å3 |
Mr = 608.64 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 6.8501 (9) Å | µ = 0.19 mm−1 |
b = 25.594 (4) Å | T = 100 K |
c = 15.284 (2) Å | 0.30 × 0.05 × 0.05 mm |
β = 99.315 (5)° |
Bruker APEXII CCD diffractometer | 5846 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker 2010) | 4076 reflections with I > 2σ(I) |
Tmin = 0.946, Tmax = 0.991 | Rint = 0.057 |
14953 measured reflections |
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.171 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | Δρmax = 0.42 e Å−3 |
5846 reflections | Δρmin = −0.39 e Å−3 |
403 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | 0.72820 (11) | 0.31430 (3) | 0.09858 (5) | 0.01445 (19) | |
N1A | 0.7048 (4) | 0.19781 (9) | 0.29893 (16) | 0.0137 (5) | |
C6B | 0.3512 (4) | 0.38704 (11) | 0.29375 (18) | 0.0122 (6) | |
C10A | 0.5483 (4) | 0.04004 (11) | 0.24893 (18) | 0.0117 (6) | |
O1B | 0.1720 (3) | 0.16717 (9) | 0.27878 (15) | 0.0216 (5) | |
C9A | 0.6023 (4) | 0.12732 (11) | 0.18728 (19) | 0.0123 (6) | |
O2B | 0.1935 (3) | 0.26945 (8) | 0.03637 (13) | 0.0185 (5) | |
C2B | 0.2047 (4) | 0.26570 (12) | 0.11659 (19) | 0.0138 (6) | |
N3A | 0.5985 (4) | 0.06106 (9) | 0.33332 (15) | 0.0130 (5) | |
O3A | 0.4773 (3) | 0.51453 (8) | 0.37187 (14) | 0.0226 (5) | |
N2B | 0.3985 (4) | 0.42849 (10) | 0.35067 (15) | 0.0141 (5) | |
O4A | 0.3461 (3) | 0.45658 (8) | 0.08667 (13) | 0.0204 (5) | |
N1B | 0.4176 (4) | 0.48549 (10) | 0.22915 (16) | 0.0140 (5) | |
C12A | 0.5942 (5) | 0.02564 (12) | 0.4084 (2) | 0.0200 (7) | |
H2'1 | 0.5327 | −0.0075 | 0.3869 | 0.030* | |
H2'2 | 0.5174 | 0.0416 | 0.4502 | 0.030* | |
H2'3 | 0.7296 | 0.0191 | 0.4384 | 0.030* | |
N4A | 0.5536 (3) | 0.07345 (9) | 0.17905 (15) | 0.0130 (5) | |
N6B | 0.1685 (4) | 0.21905 (10) | 0.15727 (16) | 0.0154 (5) | |
N3B | 0.2817 (3) | 0.35639 (10) | 0.14445 (15) | 0.0130 (5) | |
O2A | 0.5003 (3) | −0.00589 (8) | 0.23777 (13) | 0.0160 (5) | |
C12B | 0.4159 (5) | 0.42088 (13) | 0.44709 (19) | 0.0194 (7) | |
H8A1 | 0.3139 | 0.3964 | 0.4595 | 0.029* | |
H8A2 | 0.3985 | 0.4545 | 0.4756 | 0.029* | |
H8A3 | 0.5470 | 0.4067 | 0.4704 | 0.029* | |
C13B | 0.2677 (5) | 0.24331 (13) | 0.39999 (19) | 0.0219 (7) | |
H5A1 | 0.3921 | 0.2248 | 0.4201 | 0.033* | |
H5A2 | 0.1566 | 0.2220 | 0.4125 | 0.033* | |
H5A3 | 0.2684 | 0.2767 | 0.4313 | 0.033* | |
C13A | 0.5062 (5) | 0.05017 (12) | 0.09037 (18) | 0.0176 (7) | |
H1'1 | 0.5963 | 0.0210 | 0.0854 | 0.026* | |
H1'2 | 0.5212 | 0.0766 | 0.0455 | 0.026* | |
H1'3 | 0.3695 | 0.0374 | 0.0810 | 0.026* | |
O1A | 0.5986 (3) | 0.15304 (8) | 0.11890 (13) | 0.0185 (5) | |
N4B | 0.3251 (4) | 0.34063 (9) | 0.32905 (15) | 0.0125 (5) | |
C5B | 0.3307 (4) | 0.39547 (11) | 0.20163 (18) | 0.0124 (6) | |
N2A | 0.7067 (4) | 0.12816 (11) | 0.43183 (17) | 0.0173 (6) | |
N5B | 0.2466 (4) | 0.25296 (10) | 0.30381 (15) | 0.0146 (5) | |
C11A | 0.6542 (4) | 0.11251 (11) | 0.34771 (18) | 0.0118 (6) | |
C3A | 0.8699 (4) | 0.38866 (12) | 0.33665 (19) | 0.0162 (6) | |
H3 | 0.9055 | 0.4228 | 0.3579 | 0.019* | |
C7A | 0.7108 (4) | 0.23495 (11) | 0.24313 (18) | 0.0128 (6) | |
H7 | 0.6804 | 0.2280 | 0.1814 | 0.015* | |
C5A | 0.7767 (4) | 0.32939 (11) | 0.21317 (18) | 0.0118 (6) | |
C8B | 0.3641 (4) | 0.44696 (12) | 0.16650 (19) | 0.0146 (6) | |
C7B | 0.4332 (4) | 0.47830 (12) | 0.32141 (19) | 0.0151 (6) | |
C1B | 0.1943 (4) | 0.20993 (12) | 0.2492 (2) | 0.0164 (6) | |
C8A | 0.6539 (4) | 0.14645 (11) | 0.27595 (18) | 0.0116 (6) | |
C2A | 0.8602 (4) | 0.34814 (12) | 0.39644 (19) | 0.0153 (6) | |
H4 | 0.8905 | 0.3544 | 0.4584 | 0.018* | |
C6A | 0.7642 (4) | 0.28798 (11) | 0.27399 (18) | 0.0126 (6) | |
C4A | 0.8276 (4) | 0.37937 (11) | 0.24528 (19) | 0.0131 (6) | |
H2 | 0.8336 | 0.4073 | 0.2049 | 0.016* | |
C1A | 0.8059 (4) | 0.29850 (12) | 0.36480 (19) | 0.0143 (6) | |
H5 | 0.7968 | 0.2711 | 0.4058 | 0.017* | |
C3B | 0.2553 (4) | 0.30973 (11) | 0.17811 (18) | 0.0116 (6) | |
C4B | 0.2761 (4) | 0.30162 (11) | 0.27104 (18) | 0.0125 (6) | |
C11B | 0.4385 (5) | 0.53951 (12) | 0.1995 (2) | 0.0190 (7) | |
H9A1 | 0.4701 | 0.5394 | 0.1392 | 0.028* | |
H9A2 | 0.5452 | 0.5568 | 0.2396 | 0.028* | |
H9A3 | 0.3142 | 0.5584 | 0.2000 | 0.028* | |
C10B | 0.1018 (5) | 0.17369 (12) | 0.1007 (2) | 0.0211 (7) | |
H6A1 | −0.0311 | 0.1634 | 0.1100 | 0.032* | |
H6A2 | 0.1934 | 0.1445 | 0.1163 | 0.032* | |
H6A3 | 0.0989 | 0.1830 | 0.0384 | 0.032* | |
C14A | 0.7605 (5) | 0.37598 (12) | 0.0459 (2) | 0.0202 (7) | |
H20A | 0.6672 | 0.4016 | 0.0631 | 0.030* | |
H20B | 0.7358 | 0.3715 | −0.0186 | 0.030* | |
H20C | 0.8961 | 0.3884 | 0.0647 | 0.030* | |
H101 | 0.732 (5) | 0.1605 (14) | 0.439 (2) | 0.020 (9)* | |
H102 | 0.737 (6) | 0.1055 (16) | 0.482 (3) | 0.040 (11)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0197 (4) | 0.0154 (4) | 0.0089 (4) | −0.0009 (3) | 0.0042 (3) | −0.0001 (3) |
N1A | 0.0140 (13) | 0.0124 (13) | 0.0152 (13) | −0.0009 (10) | 0.0035 (9) | −0.0011 (10) |
C6B | 0.0082 (13) | 0.0170 (15) | 0.0112 (14) | 0.0029 (11) | 0.0010 (10) | −0.0040 (11) |
C10A | 0.0116 (14) | 0.0135 (15) | 0.0106 (14) | 0.0021 (11) | 0.0035 (10) | 0.0014 (11) |
O1B | 0.0240 (12) | 0.0175 (12) | 0.0230 (12) | 0.0009 (9) | 0.0031 (9) | 0.0015 (9) |
C9A | 0.0106 (14) | 0.0120 (15) | 0.0148 (15) | 0.0000 (11) | 0.0039 (10) | 0.0015 (11) |
O2B | 0.0192 (11) | 0.0264 (12) | 0.0095 (10) | −0.0005 (9) | 0.0011 (8) | −0.0064 (9) |
C2B | 0.0092 (14) | 0.0191 (16) | 0.0130 (15) | 0.0007 (11) | 0.0015 (10) | −0.0030 (11) |
N3A | 0.0164 (13) | 0.0147 (13) | 0.0080 (12) | −0.0017 (10) | 0.0022 (9) | 0.0020 (9) |
O3A | 0.0314 (13) | 0.0205 (12) | 0.0154 (12) | −0.0035 (10) | 0.0022 (9) | −0.0066 (9) |
N2B | 0.0186 (13) | 0.0175 (13) | 0.0054 (12) | 0.0016 (10) | −0.0005 (9) | −0.0038 (9) |
O4A | 0.0287 (13) | 0.0236 (12) | 0.0087 (11) | −0.0002 (10) | 0.0024 (9) | 0.0020 (9) |
N1B | 0.0134 (13) | 0.0171 (13) | 0.0116 (13) | −0.0026 (10) | 0.0025 (9) | −0.0022 (10) |
C12A | 0.0311 (18) | 0.0174 (16) | 0.0118 (15) | −0.0057 (13) | 0.0042 (12) | 0.0035 (12) |
N4A | 0.0159 (13) | 0.0142 (13) | 0.0087 (12) | 0.0000 (10) | 0.0008 (9) | −0.0007 (9) |
N6B | 0.0156 (13) | 0.0164 (13) | 0.0144 (13) | −0.0020 (10) | 0.0031 (9) | −0.0062 (10) |
N3B | 0.0108 (12) | 0.0188 (13) | 0.0093 (12) | 0.0014 (10) | 0.0016 (9) | −0.0030 (10) |
O2A | 0.0217 (12) | 0.0123 (11) | 0.0137 (11) | −0.0012 (9) | 0.0021 (8) | 0.0003 (8) |
C12B | 0.0272 (17) | 0.0241 (17) | 0.0065 (14) | 0.0013 (14) | 0.0013 (12) | −0.0031 (12) |
C13B | 0.0320 (19) | 0.0237 (17) | 0.0088 (15) | 0.0002 (14) | −0.0002 (12) | 0.0033 (12) |
C13A | 0.0262 (17) | 0.0153 (16) | 0.0099 (15) | −0.0023 (13) | −0.0010 (12) | −0.0026 (12) |
O1A | 0.0265 (12) | 0.0181 (12) | 0.0104 (11) | −0.0025 (9) | 0.0016 (9) | 0.0019 (8) |
N4B | 0.0140 (12) | 0.0161 (13) | 0.0072 (12) | 0.0031 (10) | 0.0015 (9) | −0.0021 (9) |
C5B | 0.0097 (14) | 0.0194 (16) | 0.0076 (14) | 0.0019 (11) | 0.0000 (10) | −0.0028 (11) |
N2A | 0.0289 (15) | 0.0148 (15) | 0.0081 (13) | −0.0034 (11) | 0.0021 (10) | 0.0000 (10) |
N5B | 0.0184 (13) | 0.0153 (13) | 0.0095 (12) | 0.0032 (10) | 0.0004 (9) | −0.0008 (10) |
C11A | 0.0109 (14) | 0.0122 (14) | 0.0129 (14) | 0.0015 (11) | 0.0043 (10) | −0.0006 (11) |
C3A | 0.0167 (15) | 0.0154 (15) | 0.0175 (16) | −0.0018 (12) | 0.0053 (12) | −0.0036 (12) |
C7A | 0.0130 (14) | 0.0180 (16) | 0.0074 (13) | 0.0006 (12) | 0.0019 (10) | 0.0002 (11) |
C5A | 0.0091 (14) | 0.0148 (15) | 0.0124 (14) | 0.0004 (11) | 0.0043 (10) | −0.0007 (11) |
C8B | 0.0122 (14) | 0.0202 (16) | 0.0112 (15) | 0.0028 (12) | 0.0012 (11) | −0.0030 (12) |
C7B | 0.0128 (15) | 0.0207 (16) | 0.0114 (15) | 0.0016 (12) | 0.0009 (11) | −0.0046 (12) |
C1B | 0.0114 (15) | 0.0189 (17) | 0.0185 (16) | 0.0023 (12) | 0.0014 (11) | −0.0025 (12) |
C8A | 0.0135 (14) | 0.0132 (15) | 0.0086 (14) | 0.0017 (11) | 0.0034 (10) | 0.0004 (11) |
C2A | 0.0155 (15) | 0.0185 (16) | 0.0123 (15) | −0.0018 (12) | 0.0041 (11) | −0.0016 (12) |
C6A | 0.0106 (14) | 0.0139 (15) | 0.0139 (15) | 0.0018 (11) | 0.0041 (11) | 0.0013 (11) |
C4A | 0.0132 (14) | 0.0135 (15) | 0.0129 (14) | 0.0010 (11) | 0.0030 (11) | 0.0028 (11) |
C1A | 0.0132 (14) | 0.0187 (16) | 0.0118 (14) | 0.0001 (12) | 0.0045 (11) | 0.0025 (12) |
C3B | 0.0090 (13) | 0.0178 (16) | 0.0080 (14) | 0.0031 (11) | 0.0016 (10) | −0.0033 (11) |
C4B | 0.0093 (13) | 0.0186 (16) | 0.0091 (14) | 0.0054 (11) | −0.0001 (10) | −0.0026 (11) |
C11B | 0.0205 (16) | 0.0169 (16) | 0.0202 (16) | −0.0051 (13) | 0.0054 (12) | −0.0008 (13) |
C10B | 0.0227 (17) | 0.0199 (17) | 0.0209 (17) | −0.0036 (13) | 0.0043 (13) | −0.0103 (13) |
C14A | 0.0303 (18) | 0.0191 (17) | 0.0120 (15) | 0.0030 (13) | 0.0061 (12) | 0.0031 (12) |
S1—C5A | 1.772 (3) | C13B—N5B | 1.475 (4) |
S1—C14A | 1.802 (3) | C13B—H5A1 | 0.9800 |
N1A—C7A | 1.282 (4) | C13B—H5A2 | 0.9800 |
N1A—C8A | 1.391 (4) | C13B—H5A3 | 0.9800 |
C6B—N4B | 1.329 (4) | C13A—H1'1 | 0.9800 |
C6B—N2B | 1.377 (4) | C13A—H1'2 | 0.9800 |
C6B—C5B | 1.409 (4) | C13A—H1'3 | 0.9800 |
C10A—O2A | 1.225 (3) | N4B—C4B | 1.341 (4) |
C10A—N4A | 1.373 (4) | C5B—C8B | 1.455 (4) |
C10A—N3A | 1.388 (4) | N2A—C11A | 1.339 (4) |
O1B—C1B | 1.203 (4) | N2A—H101 | 0.85 (4) |
C9A—O1A | 1.232 (3) | N2A—H102 | 0.96 (4) |
C9A—N4A | 1.419 (4) | N5B—C4B | 1.369 (4) |
C9A—C8A | 1.430 (4) | N5B—C1B | 1.393 (4) |
O2B—C2B | 1.220 (3) | C11A—C8A | 1.399 (4) |
C2B—N6B | 1.387 (4) | C3A—C2A | 1.391 (4) |
C2B—C3B | 1.473 (4) | C3A—C4A | 1.400 (4) |
N3A—C11A | 1.379 (4) | C3A—H3 | 0.9500 |
N3A—C12A | 1.467 (4) | C7A—C6A | 1.464 (4) |
O3A—C7B | 1.213 (3) | C7A—H7 | 0.9500 |
N2B—C7B | 1.384 (4) | C5A—C4A | 1.394 (4) |
N2B—C12B | 1.472 (4) | C5A—C6A | 1.421 (4) |
O4A—C8B | 1.231 (3) | C2A—C1A | 1.388 (4) |
N1B—C8B | 1.382 (4) | C2A—H4 | 0.9500 |
N1B—C7B | 1.409 (4) | C6A—C1A | 1.397 (4) |
N1B—C11B | 1.469 (4) | C4A—H2 | 0.9500 |
C12A—H2'1 | 0.9800 | C1A—H5 | 0.9500 |
C12A—H2'2 | 0.9800 | C3B—C4B | 1.420 (4) |
C12A—H2'3 | 0.9800 | C11B—H9A1 | 0.9800 |
N4A—C13A | 1.468 (3) | C11B—H9A2 | 0.9800 |
N6B—C1B | 1.407 (4) | C11B—H9A3 | 0.9800 |
N6B—C10B | 1.475 (4) | C10B—H6A1 | 0.9800 |
N3B—C3B | 1.324 (4) | C10B—H6A2 | 0.9800 |
N3B—C5B | 1.335 (4) | C10B—H6A3 | 0.9800 |
C12B—H8A1 | 0.9800 | C14A—H20A | 0.9800 |
C12B—H8A2 | 0.9800 | C14A—H20B | 0.9800 |
C12B—H8A3 | 0.9800 | C14A—H20C | 0.9800 |
C5A—S1—C14A | 103.51 (14) | C4B—N5B—C13B | 121.4 (2) |
C7A—N1A—C8A | 124.5 (3) | C1B—N5B—C13B | 116.0 (2) |
N4B—C6B—N2B | 117.7 (2) | N2A—C11A—N3A | 117.6 (3) |
N4B—C6B—C5B | 123.0 (3) | N2A—C11A—C8A | 122.2 (3) |
N2B—C6B—C5B | 119.2 (3) | N3A—C11A—C8A | 120.2 (3) |
O2A—C10A—N4A | 122.0 (3) | C2A—C3A—C4A | 120.3 (3) |
O2A—C10A—N3A | 121.4 (3) | C2A—C3A—H3 | 119.9 |
N4A—C10A—N3A | 116.6 (2) | C4A—C3A—H3 | 119.9 |
O1A—C9A—N4A | 118.1 (3) | N1A—C7A—C6A | 120.4 (3) |
O1A—C9A—C8A | 126.1 (3) | N1A—C7A—H7 | 119.8 |
N4A—C9A—C8A | 115.8 (2) | C6A—C7A—H7 | 119.8 |
O2B—C2B—N6B | 122.1 (3) | C4A—C5A—C6A | 119.5 (3) |
O2B—C2B—C3B | 123.5 (3) | C4A—C5A—S1 | 123.0 (2) |
N6B—C2B—C3B | 114.4 (2) | C6A—C5A—S1 | 117.6 (2) |
C11A—N3A—C10A | 122.6 (2) | O4A—C8B—N1B | 121.1 (3) |
C11A—N3A—C12A | 120.4 (2) | O4A—C8B—C5B | 123.4 (3) |
C10A—N3A—C12A | 117.0 (2) | N1B—C8B—C5B | 115.5 (2) |
C6B—N2B—C7B | 122.7 (2) | O3A—C7B—N2B | 122.5 (3) |
C6B—N2B—C12B | 120.2 (2) | O3A—C7B—N1B | 120.5 (3) |
C7B—N2B—C12B | 117.1 (2) | N2B—C7B—N1B | 117.0 (2) |
C8B—N1B—C7B | 124.7 (3) | O1B—C1B—N5B | 122.0 (3) |
C8B—N1B—C11B | 119.1 (2) | O1B—C1B—N6B | 121.5 (3) |
C7B—N1B—C11B | 115.9 (2) | N5B—C1B—N6B | 116.5 (3) |
N3A—C12A—H2'1 | 109.5 | N1A—C8A—C11A | 114.9 (2) |
N3A—C12A—H2'2 | 109.5 | N1A—C8A—C9A | 125.2 (2) |
H2'1—C12A—H2'2 | 109.5 | C11A—C8A—C9A | 120.0 (3) |
N3A—C12A—H2'3 | 109.5 | C1A—C2A—C3A | 119.5 (3) |
H2'1—C12A—H2'3 | 109.5 | C1A—C2A—H4 | 120.3 |
H2'2—C12A—H2'3 | 109.5 | C3A—C2A—H4 | 120.3 |
C10A—N4A—C9A | 124.9 (2) | C1A—C6A—C5A | 118.8 (3) |
C10A—N4A—C13A | 115.8 (2) | C1A—C6A—C7A | 119.9 (3) |
C9A—N4A—C13A | 119.3 (2) | C5A—C6A—C7A | 121.3 (2) |
C2B—N6B—C1B | 126.0 (2) | C5A—C4A—C3A | 120.4 (3) |
C2B—N6B—C10B | 118.4 (2) | C5A—C4A—H2 | 119.8 |
C1B—N6B—C10B | 115.6 (3) | C3A—C4A—H2 | 119.8 |
C3B—N3B—C5B | 117.2 (2) | C2A—C1A—C6A | 121.5 (3) |
N2B—C12B—H8A1 | 109.5 | C2A—C1A—H5 | 119.3 |
N2B—C12B—H8A2 | 109.5 | C6A—C1A—H5 | 119.3 |
H8A1—C12B—H8A2 | 109.5 | N3B—C3B—C4B | 121.5 (3) |
N2B—C12B—H8A3 | 109.5 | N3B—C3B—C2B | 118.4 (2) |
H8A1—C12B—H8A3 | 109.5 | C4B—C3B—C2B | 120.1 (3) |
H8A2—C12B—H8A3 | 109.5 | N4B—C4B—N5B | 118.1 (2) |
N5B—C13B—H5A1 | 109.5 | N4B—C4B—C3B | 121.8 (3) |
N5B—C13B—H5A2 | 109.5 | N5B—C4B—C3B | 120.1 (3) |
H5A1—C13B—H5A2 | 109.5 | N1B—C11B—H9A1 | 109.5 |
N5B—C13B—H5A3 | 109.5 | N1B—C11B—H9A2 | 109.5 |
H5A1—C13B—H5A3 | 109.5 | H9A1—C11B—H9A2 | 109.5 |
H5A2—C13B—H5A3 | 109.5 | N1B—C11B—H9A3 | 109.5 |
N4A—C13A—H1'1 | 109.5 | H9A1—C11B—H9A3 | 109.5 |
N4A—C13A—H1'2 | 109.5 | H9A2—C11B—H9A3 | 109.5 |
H1'1—C13A—H1'2 | 109.5 | N6B—C10B—H6A1 | 109.5 |
N4A—C13A—H1'3 | 109.5 | N6B—C10B—H6A2 | 109.5 |
H1'1—C13A—H1'3 | 109.5 | H6A1—C10B—H6A2 | 109.5 |
H1'2—C13A—H1'3 | 109.5 | N6B—C10B—H6A3 | 109.5 |
C6B—N4B—C4B | 115.6 (2) | H6A1—C10B—H6A3 | 109.5 |
N3B—C5B—C6B | 120.9 (3) | H6A2—C10B—H6A3 | 109.5 |
N3B—C5B—C8B | 118.4 (2) | S1—C14A—H20A | 109.5 |
C6B—C5B—C8B | 120.8 (3) | S1—C14A—H20B | 109.5 |
C11A—N2A—H101 | 116 (2) | H20A—C14A—H20B | 109.5 |
C11A—N2A—H102 | 125 (2) | S1—C14A—H20C | 109.5 |
H101—N2A—H102 | 118 (3) | H20A—C14A—H20C | 109.5 |
C4B—N5B—C1B | 122.6 (2) | H20B—C14A—H20C | 109.5 |
O2A—C10A—N3A—C11A | 179.6 (3) | C8B—N1B—C7B—N2B | 2.3 (4) |
N4A—C10A—N3A—C11A | −1.0 (4) | C11B—N1B—C7B—N2B | 175.0 (2) |
O2A—C10A—N3A—C12A | 0.8 (4) | C4B—N5B—C1B—O1B | 178.7 (3) |
N4A—C10A—N3A—C12A | −179.7 (3) | C13B—N5B—C1B—O1B | −1.7 (4) |
N4B—C6B—N2B—C7B | 178.6 (3) | C4B—N5B—C1B—N6B | −1.3 (4) |
C5B—C6B—N2B—C7B | −2.0 (4) | C13B—N5B—C1B—N6B | 178.3 (3) |
N4B—C6B—N2B—C12B | −0.9 (4) | C2B—N6B—C1B—O1B | −174.9 (3) |
C5B—C6B—N2B—C12B | 178.5 (3) | C10B—N6B—C1B—O1B | 3.4 (4) |
O2A—C10A—N4A—C9A | 178.1 (3) | C2B—N6B—C1B—N5B | 5.1 (4) |
N3A—C10A—N4A—C9A | −1.3 (4) | C10B—N6B—C1B—N5B | −176.6 (2) |
O2A—C10A—N4A—C13A | −2.4 (4) | C7A—N1A—C8A—C11A | −179.1 (3) |
N3A—C10A—N4A—C13A | 178.1 (2) | C7A—N1A—C8A—C9A | 0.5 (5) |
O1A—C9A—N4A—C10A | −178.9 (3) | N2A—C11A—C8A—N1A | −2.3 (4) |
C8A—C9A—N4A—C10A | 1.7 (4) | N3A—C11A—C8A—N1A | 177.4 (2) |
O1A—C9A—N4A—C13A | 1.6 (4) | N2A—C11A—C8A—C9A | 178.1 (3) |
C8A—C9A—N4A—C13A | −177.7 (2) | N3A—C11A—C8A—C9A | −2.2 (4) |
O2B—C2B—N6B—C1B | 174.2 (3) | O1A—C9A—C8A—N1A | 1.2 (5) |
C3B—C2B—N6B—C1B | −6.4 (4) | N4A—C9A—C8A—N1A | −179.5 (3) |
O2B—C2B—N6B—C10B | −4.1 (4) | O1A—C9A—C8A—C11A | −179.2 (3) |
C3B—C2B—N6B—C10B | 175.4 (2) | N4A—C9A—C8A—C11A | 0.1 (4) |
N2B—C6B—N4B—C4B | 179.0 (2) | C4A—C3A—C2A—C1A | −0.8 (4) |
C5B—C6B—N4B—C4B | −0.4 (4) | C4A—C5A—C6A—C1A | −0.8 (4) |
C3B—N3B—C5B—C6B | −0.6 (4) | S1—C5A—C6A—C1A | 178.6 (2) |
C3B—N3B—C5B—C8B | 178.9 (3) | C4A—C5A—C6A—C7A | 179.9 (3) |
N4B—C6B—C5B—N3B | 0.5 (4) | S1—C5A—C6A—C7A | −0.8 (4) |
N2B—C6B—C5B—N3B | −178.9 (3) | N1A—C7A—C6A—C1A | −1.0 (4) |
N4B—C6B—C5B—C8B | −179.0 (3) | N1A—C7A—C6A—C5A | 178.3 (3) |
N2B—C6B—C5B—C8B | 1.6 (4) | C6A—C5A—C4A—C3A | 1.2 (4) |
C10A—N3A—C11A—N2A | −177.6 (3) | S1—C5A—C4A—C3A | −178.1 (2) |
C12A—N3A—C11A—N2A | 1.1 (4) | C2A—C3A—C4A—C5A | −0.5 (4) |
C10A—N3A—C11A—C8A | 2.7 (4) | C3A—C2A—C1A—C6A | 1.2 (4) |
C12A—N3A—C11A—C8A | −178.6 (3) | C5A—C6A—C1A—C2A | −0.5 (4) |
C8A—N1A—C7A—C6A | 179.3 (3) | C7A—C6A—C1A—C2A | 178.9 (3) |
C14A—S1—C5A—C4A | −0.3 (3) | C5B—N3B—C3B—C4B | 0.6 (4) |
C14A—S1—C5A—C6A | −179.7 (2) | C5B—N3B—C3B—C2B | −178.9 (2) |
C7B—N1B—C8B—O4A | 177.1 (3) | O2B—C2B—C3B—N3B | 3.0 (4) |
C11B—N1B—C8B—O4A | 4.6 (4) | N6B—C2B—C3B—N3B | −176.5 (2) |
C7B—N1B—C8B—C5B | −2.6 (4) | O2B—C2B—C3B—C4B | −176.5 (3) |
C11B—N1B—C8B—C5B | −175.1 (3) | N6B—C2B—C3B—C4B | 4.1 (4) |
N3B—C5B—C8B—O4A | 1.4 (4) | C6B—N4B—C4B—N5B | −179.7 (2) |
C6B—C5B—C8B—O4A | −179.1 (3) | C6B—N4B—C4B—C3B | 0.4 (4) |
N3B—C5B—C8B—N1B | −178.9 (2) | C1B—N5B—C4B—N4B | 179.6 (3) |
C6B—C5B—C8B—N1B | 0.6 (4) | C13B—N5B—C4B—N4B | 0.0 (4) |
C6B—N2B—C7B—O3A | −179.0 (3) | C1B—N5B—C4B—C3B | −0.5 (4) |
C12B—N2B—C7B—O3A | 0.4 (4) | C13B—N5B—C4B—C3B | 179.9 (3) |
C6B—N2B—C7B—N1B | 0.2 (4) | N3B—C3B—C4B—N4B | −0.5 (4) |
C12B—N2B—C7B—N1B | 179.6 (2) | C2B—C3B—C4B—N4B | 178.9 (2) |
C8B—N1B—C7B—O3A | −178.5 (3) | N3B—C3B—C4B—N5B | 179.6 (3) |
C11B—N1B—C7B—O3A | −5.8 (4) | C2B—C3B—C4B—N5B | −0.9 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H101···N1A | 0.85 (4) | 2.32 (3) | 2.701 (4) | 107 (2) |
N2A—H101···O2Bi | 0.85 (4) | 2.37 (3) | 3.078 (3) | 141 (3) |
N2A—H102···O4Ai | 0.96 (4) | 2.29 (4) | 3.238 (3) | 169 (3) |
C12A—H2′1···O2A | 0.98 | 2.25 | 2.706 (4) | 107 |
C4A—H2···O2Aii | 0.95 | 2.58 | 3.159 (4) | 119 |
C3A—H3···O2Aii | 0.95 | 2.49 | 3.114 (4) | 123 |
C12A—H2′3···O4Ai | 0.98 | 2.36 | 3.014 (4) | 123 |
C1A—H5···O2Bi | 0.95 | 2.45 | 3.339 (4) | 155 |
C12B—H8A2···O3A | 0.98 | 2.33 | 2.720 (4) | 103 |
C7A—H7···S1 | 0.95 | 2.59 | 3.017 (3) | 108 |
C7A—H7···O1A | 0.95 | 2.18 | 2.849 (3) | 127 |
C13B—H5A1···O2Bi | 0.98 | 2.50 | 3.315 (4) | 140 |
C13B—H5A3···N4B | 0.98 | 2.34 | 2.770 (4) | 106 |
C13A—H1′2···O1A | 0.98 | 2.28 | 2.726 (4) | 107 |
C11B—H9A1···O4A | 0.98 | 2.37 | 2.744 (4) | 102 |
C10B—H6A3···O2B | 0.98 | 2.31 | 2.751 (4) | 107 |
C10B—H6A1···O1Aiii | 0.98 | 2.58 | 3.542 (4) | 169 |
Symmetry codes: (i) x+1/2, −y+1/2, z+1/2; (ii) −x+3/2, y+1/2, −z+1/2; (iii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C12H12N6O4·C14H16N4O2S |
Mr | 608.64 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 100 |
a, b, c (Å) | 6.8501 (9), 25.594 (4), 15.284 (2) |
β (°) | 99.315 (5) |
V (Å3) | 2644.3 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.19 |
Crystal size (mm) | 0.30 × 0.05 × 0.05 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker 2010) |
Tmin, Tmax | 0.946, 0.991 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14953, 5846, 4076 |
Rint | 0.057 |
(sin θ/λ)max (Å−1) | 0.646 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.171, 1.01 |
No. of reflections | 5846 |
No. of parameters | 403 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.42, −0.39 |
Computer programs: APEX2 (Bruker, 2010), SAINT-Plus (Bruker, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), WinGX (Farrugia, 1999), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H101···N1A | 0.85 (4) | 2.32 (3) | 2.701 (4) | 107 (2) |
N2A—H101···O2Bi | 0.85 (4) | 2.37 (3) | 3.078 (3) | 141 (3) |
N2A—H102···O4Ai | 0.96 (4) | 2.29 (4) | 3.238 (3) | 169 (3) |
C4A—H2···O2Aii | 0.95 | 2.58 | 3.159 (4) | 119 |
C3A—H3···O2Aii | 0.95 | 2.49 | 3.114 (4) | 123 |
C12A—H2'3···O4Ai | 0.98 | 2.36 | 3.014 (4) | 123 |
C1A—H5···O2Bi | 0.95 | 2.45 | 3.339 (4) | 155 |
C7A—H7···S1 | 0.95 | 2.59 | 3.017 (3) | 108 |
C7A—H7···O1A | 0.95 | 2.18 | 2.849 (3) | 127 |
C13B—H5A1···O2Bi | 0.98 | 2.50 | 3.315 (4) | 140 |
C10B—H6A1···O1Aiii | 0.98 | 2.58 | 3.542 (4) | 169 |
Symmetry codes: (i) x+1/2, −y+1/2, z+1/2; (ii) −x+3/2, y+1/2, −z+1/2; (iii) x−1, y, z. |
Acknowledgements
We would like to thank University of KwaZulu-Natal and the National Research Foundation of South Africa for funding.
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.
Schiff bases and their metal complexes exhibit unique properties which make them favourable for an array of applications such as catalysis and medicinal chemistry (Kumar et al., 2009). Moreover, Schiff bases have the added advantage of being readily derivatized and their imino nitrogen atoms possess high thermodynamic stability towards various metal centres. In an attempt, to afford a novel rhenium(I) complex containing the Schiff base, C14H16N4O2S, the title compound was unexpectedly isolated. The asymmetric unit consists of the Schiff base molecule and a tricyclic molecule, (Fig. 1) which are planar. The tricyclic molecule has been previously isolated by the oxidative deamination of 5,6-diamino-1,3-dimethylpyrimidine-2,4(1H, 3H)-dione by ammonium perrhenate (Booysen et al., 2008).
In the Schiff base molecule, the ortho-(thiomethyl) phenyl moiety is nearly co-planar with the 6-amino-1,3-dimethylpyrimidine-2,4(1H, 3H)-dione moiety. The largest deviation from the 21-atom mean plane defined by all non-hydrogen atoms of the Schiff base molecule is 0.097 (1) Å exhibited by the primary amine nitrogen atom. The C7—N1A bond length, 1.282 (4) Å, and the C8A—N1A—C7A bond angle, 124.5 (3)°, emphasize the sp2 hybridization of the imino nitrogen atom. An E-configuration is observed for the Schiff base moiety.
The tricyclic molecule consists of three fused rings, a central pyrazine ring and two terminal pyrimidine rings. The largest deviation from planarity is shown by the methyl carbon atom C10B, which is displaced by 0.129 (1) Å from the 22-atom mean plane defined by all non-hydrogen atoms. The bond lengths within the pyrazine ring suggest that they are part of a π-delocalized ring system. Thus the N4B and N5B atoms are sp2-hybridized which is confirmed by the bond angles C5B—N5B—C3B [117.2 (2)°] and C6B—N4B—C4B [115.6 (2)°].
The two molecules exhibit π-π interactions. Each tricyclic molecule is sandwiched between two Schiff base molecules. The distance between the centroid of the pyrazine ring, Cg1, and the centroid of the Schiff base phenyl ring, Cg2, within the aysmmetric unit is 3.517 (1) Å. The distance between Cg1 and Cg2 of a symmetry related molecule is 3.658 (1) Å (Figure 2). The crystal lattice is further stablized by a large number of both classical and non-classical hydrogen bonds. These hydrogen bonds are both inter and inramolecular in nature and ultimately link the Schiff base and tricyclic molecules into an infinite, three-dimensional network. Hydrogen bond lengths and angles are summarized in Table 1. The hydrogen bonding pattern is illustrated in Figure 3.