organic compounds
E)-styryl]pyrimidine
of 2-butylsulfanyl-4,6-bis[(aChina-Australia Joint Research Center for Functional Molecular Materials, Scientific Research Academy & School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
*Correspondence e-mail: wajujs@ujs.edu.cn
In the title compound, C24H24N2S, the dihedral angles between the central pyrimidine ring and pendant benzene rings are 18.46 (6) and 5.95 (6)°. The butylsulfanyl side chain adopts a twisted conformation [S—C—C—C = 177.34 (10)° and C—C—C—C = 67.68 (18)°]. No directional interactions beyond typical van der Waals contacts could be identified in the crystal.
Keywords: crystal structure; weak interactions; pyrimidine.
CCDC reference: 1010472
1. Related literature
For general background to pyrimidine derivatives and their applications, see: Walker et al. (2009); van Laar et al. (2001); Casas et al. (2006); Deng et al. (2008); Nguyen (2008). For the synthesis of the title compound, see: Liu et al. (2007).
2. Experimental
2.1. Crystal data
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2.2. Data collection
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2.3. Refinement
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Data collection: CrystalClear (Rigaku, 2008); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supporting information
CCDC reference: 1010472
https://doi.org/10.1107/S2056989015008166/hb7413sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015008166/hb7413Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989015008166/hb7413Isup3.cml
Supporting information file. DOI: https://doi.org/10.1107/S2056989015008166/hb7413Isup4.docx
For general background to pyrimidine derivatives and their applications, see: Walker et al. (2009); van Laar et al. (2001); Casas et al. (2006); Deng et al. (2008); Nguyen (2008). For the synthesis of the title compound, see: Liu et al. (2007).
Data collection: CrystalClear (Rigaku, 2008); cell
CrystalClear (Rigaku, 2008); data reduction: CrystalClear (Rigaku, 2008); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The molecular structure of (I) showing 50% displacement ellipsoids. | |
Fig. 2. Packing diagram for (I). |
C24H24N2S | F(000) = 792 |
Mr = 372.51 | Dx = 1.260 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 9.0447 (18) Å | Cell parameters from 4606 reflections |
b = 9.3798 (19) Å | θ = 3.9–28.6° |
c = 23.802 (7) Å | µ = 0.18 mm−1 |
β = 103.44 (3)° | T = 153 K |
V = 1964.0 (8) Å3 | Prism, yellow |
Z = 4 | 0.26 × 0.23 × 0.22 mm |
Rigaku CCD diffractometer | 3487 independent reflections |
Radiation source: fine-focus sealed tube | 3193 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
phi and ω scans | θmax = 25.2°, θmin = 3.9° |
Absorption correction: multi-scan multi-scan | h = −10→8 |
Tmin = 0.830, Tmax = 1.000 | k = −10→11 |
9602 measured reflections | l = −28→28 |
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)] = 0.034 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.087 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0468P)2 + 0.4259P] where P = (Fo2 + 2Fc2)/3 |
3487 reflections | (Δ/σ)max = 0.002 |
245 parameters | Δρmax = 0.20 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
C24H24N2S | V = 1964.0 (8) Å3 |
Mr = 372.51 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 9.0447 (18) Å | µ = 0.18 mm−1 |
b = 9.3798 (19) Å | T = 153 K |
c = 23.802 (7) Å | 0.26 × 0.23 × 0.22 mm |
β = 103.44 (3)° |
Rigaku CCD diffractometer | 3487 independent reflections |
Absorption correction: multi-scan multi-scan | 3193 reflections with I > 2σ(I) |
Tmin = 0.830, Tmax = 1.000 | Rint = 0.020 |
9602 measured reflections |
R[F2 > 2σ(F2)] = 0.034 | 0 restraints |
wR(F2) = 0.087 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.20 e Å−3 |
3487 reflections | Δρmin = −0.23 e Å−3 |
245 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 | 0.14918 (4) | 0.26493 (4) | 0.884447 (14) | 0.02603 (12) | |
N1 | 0.29497 (11) | 0.49599 (11) | 0.93583 (4) | 0.0198 (2) | |
N2 | 0.14298 (11) | 0.35823 (11) | 0.98633 (4) | 0.0202 (2) | |
C1 | 0.20397 (13) | 0.38866 (13) | 0.94166 (5) | 0.0193 (3) | |
C2 | 0.17542 (13) | 0.45128 (13) | 1.03058 (5) | 0.0194 (3) | |
C3 | 0.26563 (13) | 0.57051 (13) | 1.02829 (5) | 0.0205 (3) | |
H3 | 0.2852 | 0.6377 | 1.0590 | 0.025* | |
C4 | 0.32650 (13) | 0.58934 (13) | 0.98031 (5) | 0.0191 (3) | |
C5 | 0.42814 (13) | 0.70891 (13) | 0.97653 (5) | 0.0204 (3) | |
H5 | 0.4634 | 0.7661 | 1.0099 | 0.025* | |
C6 | 0.47367 (14) | 0.74153 (13) | 0.92880 (6) | 0.0219 (3) | |
H6 | 0.4330 | 0.6851 | 0.8957 | 0.026* | |
C7 | 0.57954 (14) | 0.85485 (13) | 0.92161 (6) | 0.0225 (3) | |
C8 | 0.60175 (15) | 0.88109 (15) | 0.86649 (6) | 0.0281 (3) | |
H8 | 0.5451 | 0.8285 | 0.8346 | 0.034* | |
C9 | 0.70538 (16) | 0.98295 (16) | 0.85754 (7) | 0.0343 (4) | |
H9 | 0.7194 | 0.9993 | 0.8197 | 0.041* | |
C10 | 0.78780 (16) | 1.06029 (15) | 0.90348 (7) | 0.0353 (4) | |
H10 | 0.8589 | 1.1298 | 0.8974 | 0.042* | |
C11 | 0.76658 (16) | 1.03641 (15) | 0.95844 (7) | 0.0332 (3) | |
H11 | 0.8230 | 1.0901 | 0.9901 | 0.040* | |
C12 | 0.66348 (15) | 0.93468 (14) | 0.96766 (6) | 0.0273 (3) | |
H12 | 0.6498 | 0.9192 | 1.0056 | 0.033* | |
C13 | 0.11375 (13) | 0.42439 (14) | 1.08114 (5) | 0.0210 (3) | |
H13 | 0.1239 | 0.4973 | 1.1095 | 0.025* | |
C14 | 0.04425 (14) | 0.30423 (14) | 1.08999 (5) | 0.0222 (3) | |
H14 | 0.0362 | 0.2324 | 1.0613 | 0.027* | |
C15 | −0.02107 (14) | 0.27106 (14) | 1.13927 (5) | 0.0218 (3) | |
C16 | −0.09987 (15) | 0.14320 (15) | 1.13976 (6) | 0.0286 (3) | |
H16 | −0.1076 | 0.0781 | 1.1086 | 0.034* | |
C17 | −0.16687 (16) | 0.10953 (16) | 1.18474 (7) | 0.0341 (3) | |
H17 | −0.2208 | 0.0224 | 1.1841 | 0.041* | |
C18 | −0.15537 (16) | 0.20253 (17) | 1.23059 (6) | 0.0327 (3) | |
H18 | −0.2010 | 0.1794 | 1.2616 | 0.039* | |
C19 | −0.07708 (15) | 0.32952 (16) | 1.23120 (6) | 0.0302 (3) | |
H19 | −0.0692 | 0.3936 | 1.2627 | 0.036* | |
C20 | −0.01020 (15) | 0.36359 (15) | 1.18626 (6) | 0.0265 (3) | |
H20 | 0.0438 | 0.4508 | 1.1873 | 0.032* | |
C21 | 0.25447 (15) | 0.32567 (15) | 0.83313 (5) | 0.0252 (3) | |
H21A | 0.2058 | 0.2874 | 0.7945 | 0.030* | |
H21B | 0.2489 | 0.4310 | 0.8308 | 0.030* | |
C22 | 0.42011 (15) | 0.28109 (15) | 0.84837 (6) | 0.0286 (3) | |
H22A | 0.4260 | 0.1761 | 0.8524 | 0.034* | |
H22B | 0.4702 | 0.3232 | 0.8861 | 0.034* | |
C23 | 0.50566 (18) | 0.32712 (16) | 0.80329 (7) | 0.0370 (4) | |
H23A | 0.6071 | 0.2814 | 0.8124 | 0.044* | |
H23B | 0.4501 | 0.2916 | 0.7650 | 0.044* | |
C24 | 0.52647 (17) | 0.48708 (16) | 0.79936 (7) | 0.0364 (4) | |
H24A | 0.5838 | 0.5078 | 0.7701 | 0.055* | |
H24B | 0.5823 | 0.5235 | 0.8369 | 0.055* | |
H24C | 0.4267 | 0.5333 | 0.7886 | 0.055* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0269 (2) | 0.0267 (2) | 0.0270 (2) | −0.00895 (13) | 0.01143 (15) | −0.00718 (14) |
N1 | 0.0190 (5) | 0.0189 (6) | 0.0221 (5) | 0.0003 (4) | 0.0062 (4) | 0.0002 (4) |
N2 | 0.0189 (5) | 0.0199 (6) | 0.0226 (5) | 0.0010 (4) | 0.0066 (4) | 0.0013 (4) |
C1 | 0.0174 (6) | 0.0188 (6) | 0.0219 (6) | 0.0015 (5) | 0.0051 (5) | 0.0001 (5) |
C2 | 0.0164 (6) | 0.0205 (7) | 0.0214 (6) | 0.0038 (5) | 0.0045 (5) | 0.0033 (5) |
C3 | 0.0208 (6) | 0.0202 (7) | 0.0206 (6) | 0.0011 (5) | 0.0048 (5) | −0.0007 (5) |
C4 | 0.0169 (6) | 0.0185 (6) | 0.0216 (6) | 0.0028 (5) | 0.0042 (5) | 0.0015 (5) |
C5 | 0.0203 (6) | 0.0180 (6) | 0.0231 (6) | −0.0003 (5) | 0.0052 (5) | −0.0008 (5) |
C6 | 0.0230 (7) | 0.0187 (6) | 0.0248 (7) | −0.0007 (5) | 0.0071 (5) | −0.0010 (5) |
C7 | 0.0218 (6) | 0.0184 (6) | 0.0292 (7) | 0.0026 (5) | 0.0096 (5) | 0.0023 (5) |
C8 | 0.0299 (7) | 0.0268 (7) | 0.0299 (7) | 0.0007 (6) | 0.0116 (6) | 0.0030 (6) |
C9 | 0.0355 (8) | 0.0322 (8) | 0.0410 (9) | 0.0035 (6) | 0.0207 (7) | 0.0129 (7) |
C10 | 0.0260 (7) | 0.0243 (8) | 0.0595 (10) | −0.0016 (6) | 0.0178 (7) | 0.0089 (7) |
C11 | 0.0267 (7) | 0.0249 (7) | 0.0471 (9) | −0.0038 (6) | 0.0069 (7) | −0.0020 (7) |
C12 | 0.0270 (7) | 0.0235 (7) | 0.0327 (7) | −0.0010 (5) | 0.0094 (6) | 0.0005 (6) |
C13 | 0.0195 (6) | 0.0226 (7) | 0.0210 (6) | 0.0024 (5) | 0.0051 (5) | 0.0007 (5) |
C14 | 0.0226 (6) | 0.0226 (7) | 0.0217 (6) | 0.0023 (5) | 0.0058 (5) | 0.0013 (5) |
C15 | 0.0186 (6) | 0.0241 (7) | 0.0231 (7) | 0.0038 (5) | 0.0056 (5) | 0.0048 (5) |
C16 | 0.0299 (7) | 0.0266 (7) | 0.0306 (7) | −0.0012 (6) | 0.0099 (6) | 0.0026 (6) |
C17 | 0.0311 (8) | 0.0331 (8) | 0.0411 (8) | −0.0036 (6) | 0.0148 (7) | 0.0108 (7) |
C18 | 0.0291 (8) | 0.0413 (9) | 0.0324 (8) | 0.0077 (6) | 0.0171 (6) | 0.0142 (7) |
C19 | 0.0322 (7) | 0.0361 (8) | 0.0240 (7) | 0.0080 (6) | 0.0102 (6) | 0.0040 (6) |
C20 | 0.0277 (7) | 0.0271 (7) | 0.0261 (7) | 0.0008 (6) | 0.0092 (6) | 0.0043 (6) |
C21 | 0.0269 (7) | 0.0296 (7) | 0.0195 (6) | −0.0036 (6) | 0.0066 (5) | −0.0028 (6) |
C22 | 0.0297 (7) | 0.0272 (7) | 0.0324 (8) | 0.0029 (6) | 0.0146 (6) | 0.0036 (6) |
C23 | 0.0427 (9) | 0.0314 (8) | 0.0454 (9) | 0.0054 (7) | 0.0276 (7) | 0.0035 (7) |
C24 | 0.0350 (8) | 0.0343 (8) | 0.0436 (9) | −0.0003 (6) | 0.0171 (7) | 0.0063 (7) |
S1—C1 | 1.7701 (13) | C13—H13 | 0.9500 |
S1—C21 | 1.8066 (14) | C14—C15 | 1.4642 (18) |
N1—C1 | 1.3279 (16) | C14—H14 | 0.9500 |
N1—C4 | 1.3523 (16) | C15—C16 | 1.3966 (19) |
N2—C1 | 1.3375 (16) | C15—C20 | 1.4009 (19) |
N2—C2 | 1.3466 (16) | C16—C17 | 1.384 (2) |
C2—C3 | 1.3929 (18) | C16—H16 | 0.9500 |
C2—C13 | 1.4611 (18) | C17—C18 | 1.382 (2) |
C3—C4 | 1.3896 (17) | C17—H17 | 0.9500 |
C3—H3 | 0.9500 | C18—C19 | 1.384 (2) |
C4—C5 | 1.4662 (17) | C18—H18 | 0.9500 |
C5—C6 | 1.3309 (18) | C19—C20 | 1.3831 (19) |
C5—H5 | 0.9500 | C19—H19 | 0.9500 |
C6—C7 | 1.4670 (18) | C20—H20 | 0.9500 |
C6—H6 | 0.9500 | C21—C22 | 1.5160 (19) |
C7—C8 | 1.3946 (19) | C21—H21A | 0.9900 |
C7—C12 | 1.3969 (19) | C21—H21B | 0.9900 |
C8—C9 | 1.389 (2) | C22—C23 | 1.5239 (19) |
C8—H8 | 0.9500 | C22—H22A | 0.9900 |
C9—C10 | 1.378 (2) | C22—H22B | 0.9900 |
C9—H9 | 0.9500 | C23—C24 | 1.518 (2) |
C10—C11 | 1.384 (2) | C23—H23A | 0.9900 |
C10—H10 | 0.9500 | C23—H23B | 0.9900 |
C11—C12 | 1.3868 (19) | C24—H24A | 0.9800 |
C11—H11 | 0.9500 | C24—H24B | 0.9800 |
C12—H12 | 0.9500 | C24—H24C | 0.9800 |
C13—C14 | 1.3310 (19) | ||
C1—S1—C21 | 102.48 (6) | C15—C14—H14 | 116.6 |
C1—N1—C4 | 115.60 (11) | C16—C15—C20 | 117.82 (12) |
C1—N2—C2 | 115.35 (11) | C16—C15—C14 | 119.39 (12) |
N1—C1—N2 | 128.69 (12) | C20—C15—C14 | 122.78 (12) |
N1—C1—S1 | 119.09 (9) | C17—C16—C15 | 121.23 (13) |
N2—C1—S1 | 112.22 (9) | C17—C16—H16 | 119.4 |
N2—C2—C3 | 120.87 (11) | C15—C16—H16 | 119.4 |
N2—C2—C13 | 118.47 (11) | C18—C17—C16 | 120.05 (14) |
C3—C2—C13 | 120.66 (12) | C18—C17—H17 | 120.0 |
C4—C3—C2 | 118.80 (12) | C16—C17—H17 | 120.0 |
C4—C3—H3 | 120.6 | C17—C18—C19 | 119.73 (13) |
C2—C3—H3 | 120.6 | C17—C18—H18 | 120.1 |
N1—C4—C3 | 120.63 (11) | C19—C18—H18 | 120.1 |
N1—C4—C5 | 117.93 (11) | C20—C19—C18 | 120.36 (14) |
C3—C4—C5 | 121.43 (12) | C20—C19—H19 | 119.8 |
C6—C5—C4 | 123.44 (12) | C18—C19—H19 | 119.8 |
C6—C5—H5 | 118.3 | C19—C20—C15 | 120.80 (13) |
C4—C5—H5 | 118.3 | C19—C20—H20 | 119.6 |
C5—C6—C7 | 127.30 (12) | C15—C20—H20 | 119.6 |
C5—C6—H6 | 116.4 | C22—C21—S1 | 113.46 (9) |
C7—C6—H6 | 116.4 | C22—C21—H21A | 108.9 |
C8—C7—C12 | 118.20 (12) | S1—C21—H21A | 108.9 |
C8—C7—C6 | 118.57 (12) | C22—C21—H21B | 108.9 |
C12—C7—C6 | 123.19 (12) | S1—C21—H21B | 108.9 |
C9—C8—C7 | 121.04 (14) | H21A—C21—H21B | 107.7 |
C9—C8—H8 | 119.5 | C21—C22—C23 | 112.88 (12) |
C7—C8—H8 | 119.5 | C21—C22—H22A | 109.0 |
C10—C9—C8 | 120.01 (14) | C23—C22—H22A | 109.0 |
C10—C9—H9 | 120.0 | C21—C22—H22B | 109.0 |
C8—C9—H9 | 120.0 | C23—C22—H22B | 109.0 |
C9—C10—C11 | 119.78 (13) | H22A—C22—H22B | 107.8 |
C9—C10—H10 | 120.1 | C24—C23—C22 | 114.46 (12) |
C11—C10—H10 | 120.1 | C24—C23—H23A | 108.6 |
C10—C11—C12 | 120.47 (14) | C22—C23—H23A | 108.6 |
C10—C11—H11 | 119.8 | C24—C23—H23B | 108.6 |
C12—C11—H11 | 119.8 | C22—C23—H23B | 108.6 |
C11—C12—C7 | 120.50 (13) | H23A—C23—H23B | 107.6 |
C11—C12—H12 | 119.8 | C23—C24—H24A | 109.5 |
C7—C12—H12 | 119.8 | C23—C24—H24B | 109.5 |
C14—C13—C2 | 124.15 (12) | H24A—C24—H24B | 109.5 |
C14—C13—H13 | 117.9 | C23—C24—H24C | 109.5 |
C2—C13—H13 | 117.9 | H24A—C24—H24C | 109.5 |
C13—C14—C15 | 126.89 (13) | H24B—C24—H24C | 109.5 |
C13—C14—H14 | 116.6 | ||
C4—N1—C1—N2 | −2.18 (18) | C8—C9—C10—C11 | −0.2 (2) |
C4—N1—C1—S1 | 177.30 (9) | C9—C10—C11—C12 | 0.3 (2) |
C2—N2—C1—N1 | 1.89 (18) | C10—C11—C12—C7 | 0.0 (2) |
C2—N2—C1—S1 | −177.61 (8) | C8—C7—C12—C11 | −0.42 (19) |
C21—S1—C1—N1 | 3.44 (11) | C6—C7—C12—C11 | 177.28 (12) |
C21—S1—C1—N2 | −177.00 (9) | N2—C2—C13—C14 | 9.40 (18) |
C1—N2—C2—C3 | 0.51 (16) | C3—C2—C13—C14 | −170.62 (12) |
C1—N2—C2—C13 | −179.51 (10) | C2—C13—C14—C15 | −179.42 (11) |
N2—C2—C3—C4 | −2.32 (17) | C13—C14—C15—C16 | 175.44 (12) |
C13—C2—C3—C4 | 177.70 (11) | C13—C14—C15—C20 | −3.6 (2) |
C1—N1—C4—C3 | 0.06 (16) | C20—C15—C16—C17 | 0.83 (19) |
C1—N1—C4—C5 | 179.18 (10) | C14—C15—C16—C17 | −178.22 (12) |
C2—C3—C4—N1 | 2.01 (17) | C15—C16—C17—C18 | −0.6 (2) |
C2—C3—C4—C5 | −177.07 (11) | C16—C17—C18—C19 | 0.2 (2) |
N1—C4—C5—C6 | 9.66 (18) | C17—C18—C19—C20 | −0.1 (2) |
C3—C4—C5—C6 | −171.24 (12) | C18—C19—C20—C15 | 0.4 (2) |
C4—C5—C6—C7 | −177.30 (11) | C16—C15—C20—C19 | −0.72 (18) |
C5—C6—C7—C8 | −173.89 (12) | C14—C15—C20—C19 | 178.30 (12) |
C5—C6—C7—C12 | 8.4 (2) | C1—S1—C21—C22 | 78.82 (11) |
C12—C7—C8—C9 | 0.54 (19) | S1—C21—C22—C23 | 177.34 (10) |
C6—C7—C8—C9 | −177.27 (12) | C21—C22—C23—C24 | 67.68 (18) |
C7—C8—C9—C10 | −0.2 (2) |
Experimental details
Crystal data | |
Chemical formula | C24H24N2S |
Mr | 372.51 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 153 |
a, b, c (Å) | 9.0447 (18), 9.3798 (19), 23.802 (7) |
β (°) | 103.44 (3) |
V (Å3) | 1964.0 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.18 |
Crystal size (mm) | 0.26 × 0.23 × 0.22 |
Data collection | |
Diffractometer | Rigaku CCD |
Absorption correction | Multi-scan multi-scan |
Tmin, Tmax | 0.830, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9602, 3487, 3193 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.599 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.034, 0.087, 1.06 |
No. of reflections | 3487 |
No. of parameters | 245 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.20, −0.23 |
Computer programs: CrystalClear (Rigaku, 2008), SHELXTL (Sheldrick, 2008).
Acknowledgements
This research was supported financially by the Research Foundation of Jiangsu University (grant No. 13JDG066).
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