organic compounds
5-(4-Fluorophenyl)-2-[2-(5-phenyl-1,3-oxazol-2-yl)phenyl]-1,3-oxazole
aDepartment of Chemistry, Kharkov V. N. Karazin National University, 4 Svobody Sqr., Kharkov 61077, Ukraine, and bFaculty of Chemistry, University of Gdańsk, Sobieskiego 18, 80-952 Gdańsk, Poland
*Correspondence e-mail: andrey.o.doroshenko@univer.kharkov.ua
In the title compound, C24H15FN2O2, the dihedral angles between the central benzene ring and the oxazole rings are 10.7 (6) and 64.1 (5)°. The dihedral angles between the oxazole rings and their pendant rings are 2.0 (3) and 24.3 (2)°. The F atoms are disordered over two sites with occupancies of 0.627 (3) and 0.373 (3) in the phenylene–oxazolyl–phenyl and in oxazolyl–phenyl fragments, respectively. In the molecules are linked through a network of C—H⋯F and weak π–π stacking interactions.
Related literature
For background to the practical applications of 1,2-bis-(5-phenyl-oxazol-2-yl)benzene (ortho-POPOP) analogs (spectroscopic and fluorescence kinetics data), see: Doroshenko et al. (1996, 1999, 2000a,c, 2002a), Kirichenko et al. (1998). For related structures, see: Doroshenko et al. (1994, 1997, 2000b, 2002b).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810031235/fb2208sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810031235/fb2208Isup2.hkl
Synthesis of the title compound was conducted according to the procedure presented on Fig. 4:
1 g (0.0038 mol) of 2-(5-phenyl-oxazol-2-yl)benzoic acid (Doroshenko, 1994, 2000b, 2002b) was boiled in 15 ml of thionyl chloride during 2 h. After adding of 20 ml of ortho-xylene the excess of thionyl chloride was distilled off. The resulting solution of 2-(5-phenyl-oxazol-2-yl)benzoic acid chloride in xylene was added to the solution of 0.72 g (0.0038 mol) of 4-F-ω-aminoacetophenone hydrochloride in 20 ml of water. The reaction mixture was gradually basified to pH~9 by the saturated aqueous sodium carbonate while intensive stirring for 1 h. The resulting solid was filtered, washed by distilled water, dried, dissolved in 25 ml of concentrated sulfuric acid and left on for 7 h at room temperature. Then the reaction mixture was poured on ice and filtered to give 0.92 g (0.0024 mol, 60%) of the final product (1-(5-[4'-F-phenyl]-oxazol-2-yl)-2-(5-phenyloxazol-2-yl)-benzene) as colorless solid (m.p. 98–99°C). The crystals were obtained by crystallization from hexane.
The necessary precursors have been prepared from the commercially available chemicals by the following procedures:
4-F-ω-Br-Acetophenone: 16 g (0.1 mol) of bromine was added dropwise to the solution 13.8 g (0.1 mol) of 4-F-acetophenone in 50 ml of ethanol at 30–40°C while stirring. After decolorization of the reaction mixture, ethanol was removed in vacuo. The resulting light yellow oily liquid was washed several times with distilled water to remove the traces of hydrobromic acid and used in the following synthesis without additional purification. Yield 19.1 g (0.088 mol, 88%).
4-F-ω-Amino-acetophenone hydrochloride: 6.5 g (0.046 mol) of hexamethylenetetramine was added portionwise at continuous stirring to the solution of 10 g (0.046 mol) of 4-F-ω-Br-acetophenone in 70 ml of chloroform. The reaction mixture was stirred during 5 h, then the precipitated solid was filtered, washed with chloroform, dried and mixed with 25 ml of concentrated HCl in 70 ml of ethanol. The mixture was stirred until the complete dissolution was reached and then it was kept for 7 h at room temperature. The precipitated ammonium chloride was filtered off, the filtrate was concentrated in vacuo and the resulted solid was boiled with 50 ml of acetone during 1 h, cooled to the room temperature and filtered off to give 7.2 g (0.038 mol, 83%) of colorless powder of 4-F-ω-aminoacetophenone hydrochloride (m.p. 169–171°C).
All the H atoms could be seen in the difference density maps with the exception of the atoms H2X and H27X that are disordered with F1 and F1A, respectively. However, the H atoms have been situated into the idealized positions with C—H = 0.93 Å and constrained to ride on their parent atoms with Uiso(H) = 1.2Ueq(C). The distances C2-F1 and C27-F1A have been restrained by SADI command of SHELXL97 (Sheldrick, 2008). The value of an effective standard deviation of SADI was 0.001. The sum of the occupations of F1 and F1A was constrained to equal to 1 as it follows from the reaction (Fig. 3). Both fluorines were refined anisotropically.
Derivatives of 1,2-bis-(5-phenyl-oxazol-2-yl)benzene (ortho-POPOP) belong to the class of organic molecules, which exhibit efficient fluorescence with abnormally high
(Doroshenko, 1996, 1999, 2000b). These molecules are prospective for their practical application as fluorescent probes, labels and chemosensors (Doroshenko, 2002a). Presence of two bulky heterocyclic substituents in 1,2-positions of the ortho-POPOP central benzene ring results in a significant sterical hindrance. This hindrance is manifested by a prominent non-planarity of ortho-POPOPs both in the crystalline state (Doroshenko, 1994) and in solutions (Doroshenko, 1996, 2002a). All the already examined crystal structures of the ortho-analogs of POPOP are characterized by essentially different angles between the planes of the central phenylene and each of the attached heterocyclic rings. Thus, two quasi-planar fragments containing two and three aromatic or heteroaromatic rings could be defined for the ortho-POPOPs molecules in crystals (Doroshenko, 1994, 1997, 2000b, 2002b).The same arrangement is typical for the newly synthesized fluoro-substituted representative of this series (Fig. 1). The fluorine atom and the corresponding hydrogen are significantly disordered in the π-electron ring–π-electron ring interactions in the solid state (Fig. 3, Tab. 2).
over two sites with probabilities 0.627 (3) and 0.373 (3) and vice versa (Fig. 2). The title molecules are linked through a network of C–H···F hydrogen bonds (Tab. 1) andFor background to the practical applications of 1,2-bis-(5-phenyl-oxazol-2-yl)benzene (ortho-POPOP) analogs (spectroscopic and fluorescence kinetics data), see: Doroshenko et al. (1996, 1999, 2000a,c, 2002a), Kirichenko et al. (1998). For related structures, see: Doroshenko et al. (1994, 1997, 2000b, 2002b).
Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell
CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. Two quasi-planar fragments in the molecule of the title compound in the crystalline state: phenylene-oxazolyl-phenyl mean plane is shown in red, while as oxazolyl-phenyl one - in green (the interplanar angle is ~75°). | |
Fig. 2. The title molecule with the atom numbering scheme. The displacement ellipsoids are drawn at the 25% probability level. Cg1, Cg2 and Cg3 denote the ring centroids. | |
Fig. 3. The arrangement of the molecules in the crystal structure, viewed approximately along the c axis. The C–H···F interactions are represented by the dashed lines and the π-electron ring-π-electron ring interactions by the dotted lines. The H atoms not involved in interactions have been omitted [symmetry codes: (i) x + 1, y + 1, z; (ii) x + 1, y, z; (iii) -x, -y, -z; (iv) -x, -y + 1, -z.] | |
Fig. 4. The scheme of the synthesis of the title compound. General procedure is analogous to that of Doroshenko (1994, 2000b, 2002b). |
C24H15FN2O2 | F(000) = 792 |
Mr = 382.38 | Dx = 1.353 Mg m−3 |
Monoclinic, P21/c | Melting point = 371–372 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 9.3158 (3) Å | Cell parameters from 3303 reflections |
b = 10.8176 (3) Å | θ = 3.3–27.5° |
c = 18.9449 (5) Å | µ = 0.09 mm−1 |
β = 100.571 (3)° | T = 295 K |
V = 1876.76 (9) Å3 | Plate, colorless |
Z = 4 | 0.6 × 0.3 × 0.05 mm |
Oxford Diffraction GEMINI R ULTRA Ruby CCD diffractometer | 4263 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 2707 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.024 |
Detector resolution: 10.4002 pixels mm-1 | θmax = 27.5°, θmin = 3.3° |
ω–scan | h = −12→8 |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008) | k = −14→13 |
Tmin = 0.956, Tmax = 0.991 | l = −24→23 |
16242 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.048 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.120 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.057P)2 + 0.132P] where P = (Fo2 + 2Fc2)/3 |
4263 reflections | (Δ/σ)max < 0.001 |
266 parameters | Δρmax = 0.11 e Å−3 |
1 restraint | Δρmin = −0.17 e Å−3 |
C24H15FN2O2 | V = 1876.76 (9) Å3 |
Mr = 382.38 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 9.3158 (3) Å | µ = 0.09 mm−1 |
b = 10.8176 (3) Å | T = 295 K |
c = 18.9449 (5) Å | 0.6 × 0.3 × 0.05 mm |
β = 100.571 (3)° |
Oxford Diffraction GEMINI R ULTRA Ruby CCD diffractometer | 4263 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008) | 2707 reflections with I > 2σ(I) |
Tmin = 0.956, Tmax = 0.991 | Rint = 0.024 |
16242 measured reflections |
R[F2 > 2σ(F2)] = 0.048 | 1 restraint |
wR(F2) = 0.120 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.11 e Å−3 |
4263 reflections | Δρmin = −0.17 e Å−3 |
266 parameters |
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. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
C2 | −0.2973 (2) | −0.04508 (16) | 0.07969 (11) | 0.0836 (5) | |
H2X | −0.3553 | −0.1002 | 0.0996 | 0.100* | 0.373 (3) |
C3 | −0.3040 (2) | −0.04438 (19) | 0.00717 (11) | 0.0897 (6) | |
H3A | −0.3658 | −0.0985 | −0.0221 | 0.108* | |
C4 | −0.21904 (19) | 0.03660 (18) | −0.02205 (9) | 0.0782 (5) | |
H4A | −0.2227 | 0.0367 | −0.0714 | 0.094* | |
C5 | −0.12753 (16) | 0.11865 (14) | 0.02066 (8) | 0.0567 (4) | |
C6 | −0.12191 (19) | 0.11481 (14) | 0.09413 (8) | 0.0637 (4) | |
H6A | −0.0595 | 0.1680 | 0.1238 | 0.076* | |
C7 | −0.2071 (2) | 0.03362 (15) | 0.12375 (10) | 0.0765 (5) | |
H7A | −0.2035 | 0.0321 | 0.1731 | 0.092* | |
C8 | −0.04037 (17) | 0.20440 (15) | −0.01170 (8) | 0.0610 (4) | |
O9 | 0.05304 (11) | 0.28136 (9) | 0.03280 (5) | 0.0564 (3) | |
C10 | 0.12111 (18) | 0.34965 (15) | −0.01103 (8) | 0.0613 (4) | |
N11 | 0.07881 (19) | 0.32285 (16) | −0.07828 (7) | 0.0901 (5) | |
C12 | −0.0236 (2) | 0.2319 (2) | −0.07878 (9) | 0.0898 (6) | |
H12A | −0.0746 | 0.1943 | −0.1200 | 0.108* | |
C13 | 0.22591 (18) | 0.44337 (13) | 0.01956 (8) | 0.0593 (4) | |
C14 | 0.2713 (2) | 0.52658 (16) | −0.02812 (10) | 0.0767 (5) | |
H14A | 0.2363 | 0.5179 | −0.0771 | 0.092* | |
C15 | 0.3661 (3) | 0.62072 (17) | −0.00440 (13) | 0.0892 (6) | |
H15A | 0.3955 | 0.6748 | −0.0371 | 0.107* | |
C16 | 0.4173 (3) | 0.63497 (17) | 0.06724 (13) | 0.0990 (7) | |
H16A | 0.4813 | 0.6992 | 0.0835 | 0.119* | |
C17 | 0.3742 (2) | 0.55401 (15) | 0.11556 (10) | 0.0850 (6) | |
H17A | 0.4091 | 0.5648 | 0.1644 | 0.102* | |
C18 | 0.28031 (18) | 0.45720 (13) | 0.09299 (8) | 0.0593 (4) | |
C19 | 0.24338 (18) | 0.37467 (13) | 0.14869 (8) | 0.0570 (4) | |
O20 | 0.28866 (11) | 0.25451 (8) | 0.14949 (5) | 0.0531 (3) | |
C21 | 0.24141 (16) | 0.20247 (13) | 0.20772 (7) | 0.0522 (4) | |
C22 | 0.1756 (2) | 0.29195 (15) | 0.23785 (8) | 0.0685 (5) | |
H22A | 0.1339 | 0.2821 | 0.2785 | 0.082* | |
N23 | 0.17751 (17) | 0.40188 (12) | 0.20054 (7) | 0.0730 (4) | |
C24 | 0.27167 (16) | 0.07253 (13) | 0.22396 (7) | 0.0516 (4) | |
C25 | 0.18402 (19) | 0.00816 (16) | 0.26323 (8) | 0.0676 (4) | |
H25A | 0.1055 | 0.0477 | 0.2775 | 0.081* | |
C26 | 0.2127 (2) | −0.11355 (16) | 0.28108 (9) | 0.0779 (5) | |
H26A | 0.1547 | −0.1562 | 0.3079 | 0.093* | |
C27 | 0.3264 (2) | −0.17102 (13) | 0.25913 (9) | 0.0783 (5) | |
H27X | 0.3449 | −0.2537 | 0.2710 | 0.094* | 0.627 (3) |
C28 | 0.4143 (2) | −0.11109 (16) | 0.22020 (9) | 0.0731 (5) | |
H28A | 0.4919 | −0.1521 | 0.2059 | 0.088* | |
C29 | 0.38663 (13) | 0.01038 (10) | 0.20252 (6) | 0.0603 (4) | |
H29A | 0.4458 | 0.0518 | 0.1757 | 0.072* | |
F1 | −0.37996 (13) | −0.12266 (10) | 0.10536 (6) | 0.1162 (10) | 0.627 (3) |
F1A | 0.35448 (13) | −0.28464 (10) | 0.27722 (6) | 0.1097 (15) | 0.373 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C2 | 0.0755 (13) | 0.0850 (13) | 0.0943 (14) | −0.0163 (10) | 0.0260 (11) | −0.0062 (11) |
C3 | 0.0700 (13) | 0.1112 (15) | 0.0847 (14) | −0.0244 (11) | 0.0053 (11) | −0.0203 (11) |
C4 | 0.0627 (11) | 0.1125 (15) | 0.0551 (9) | −0.0099 (10) | −0.0005 (9) | −0.0114 (9) |
C5 | 0.0493 (9) | 0.0709 (9) | 0.0482 (8) | 0.0065 (7) | 0.0046 (7) | −0.0034 (7) |
C6 | 0.0745 (11) | 0.0633 (9) | 0.0536 (9) | −0.0050 (8) | 0.0123 (8) | −0.0077 (7) |
C7 | 0.0945 (14) | 0.0753 (11) | 0.0638 (10) | −0.0066 (10) | 0.0252 (10) | −0.0043 (9) |
C8 | 0.0528 (9) | 0.0831 (10) | 0.0445 (8) | 0.0028 (8) | 0.0022 (7) | −0.0033 (7) |
O9 | 0.0592 (6) | 0.0682 (6) | 0.0411 (5) | 0.0030 (5) | 0.0076 (5) | 0.0026 (4) |
C10 | 0.0634 (10) | 0.0778 (10) | 0.0439 (8) | 0.0072 (8) | 0.0129 (7) | 0.0120 (7) |
N11 | 0.0927 (12) | 0.1320 (14) | 0.0450 (8) | −0.0220 (11) | 0.0112 (8) | 0.0085 (8) |
C12 | 0.0843 (13) | 0.1395 (17) | 0.0429 (9) | −0.0238 (13) | 0.0049 (9) | −0.0017 (10) |
C13 | 0.0646 (10) | 0.0579 (9) | 0.0569 (9) | 0.0104 (7) | 0.0154 (8) | 0.0087 (7) |
C14 | 0.0890 (13) | 0.0739 (11) | 0.0701 (11) | 0.0085 (10) | 0.0221 (10) | 0.0202 (9) |
C15 | 0.1089 (16) | 0.0629 (11) | 0.1017 (16) | 0.0036 (11) | 0.0347 (13) | 0.0229 (10) |
C16 | 0.1239 (19) | 0.0595 (11) | 0.1153 (18) | −0.0168 (11) | 0.0265 (15) | 0.0006 (11) |
C17 | 0.1146 (16) | 0.0605 (10) | 0.0780 (12) | −0.0085 (11) | 0.0124 (11) | −0.0034 (9) |
C18 | 0.0709 (11) | 0.0502 (8) | 0.0574 (9) | 0.0084 (8) | 0.0136 (8) | 0.0009 (7) |
C19 | 0.0665 (10) | 0.0543 (9) | 0.0491 (8) | 0.0066 (7) | 0.0074 (7) | −0.0036 (7) |
O20 | 0.0637 (6) | 0.0552 (6) | 0.0401 (5) | 0.0056 (5) | 0.0089 (5) | 0.0005 (4) |
C21 | 0.0564 (9) | 0.0641 (9) | 0.0351 (7) | 0.0010 (7) | 0.0055 (6) | −0.0003 (6) |
C22 | 0.0850 (12) | 0.0756 (11) | 0.0490 (9) | 0.0089 (9) | 0.0230 (9) | 0.0005 (8) |
N23 | 0.0956 (11) | 0.0684 (8) | 0.0592 (8) | 0.0146 (8) | 0.0251 (8) | −0.0016 (7) |
C24 | 0.0571 (9) | 0.0620 (8) | 0.0327 (6) | −0.0013 (7) | 0.0005 (6) | −0.0014 (6) |
C25 | 0.0741 (11) | 0.0758 (10) | 0.0542 (9) | 0.0029 (9) | 0.0154 (8) | 0.0047 (8) |
C26 | 0.0976 (14) | 0.0739 (11) | 0.0631 (10) | −0.0092 (11) | 0.0175 (10) | 0.0124 (9) |
C27 | 0.1052 (15) | 0.0623 (10) | 0.0629 (11) | 0.0043 (10) | 0.0037 (11) | 0.0084 (8) |
C28 | 0.0789 (12) | 0.0714 (11) | 0.0673 (11) | 0.0136 (9) | 0.0088 (9) | −0.0004 (8) |
C29 | 0.0626 (10) | 0.0689 (10) | 0.0480 (8) | 0.0003 (8) | 0.0066 (7) | −0.0003 (7) |
F1 | 0.1184 (17) | 0.1224 (17) | 0.1149 (16) | −0.0571 (13) | 0.0399 (13) | −0.0033 (12) |
F1A | 0.144 (3) | 0.0654 (19) | 0.121 (3) | 0.0135 (18) | 0.030 (2) | 0.0228 (16) |
F1—C2 | 1.293 (2) | C15—C16 | 1.362 (3) |
F1A—C27 | 1.290 (2) | C15—H15A | 0.9300 |
C2—C3 | 1.364 (3) | C16—C17 | 1.379 (3) |
C2—C7 | 1.368 (2) | C16—H16A | 0.9300 |
C2—H2X | 0.9300 | C17—C18 | 1.381 (2) |
C3—C4 | 1.364 (2) | C17—H17A | 0.9300 |
C3—H3A | 0.9300 | C18—C19 | 1.470 (2) |
C4—C5 | 1.384 (2) | C19—N23 | 1.2842 (18) |
C4—H4A | 0.9300 | C19—O20 | 1.3658 (16) |
C5—C6 | 1.384 (2) | O20—C21 | 1.3806 (15) |
C5—C8 | 1.442 (2) | C21—C22 | 1.329 (2) |
C6—C7 | 1.371 (2) | C21—C24 | 1.4553 (19) |
C6—H6A | 0.9300 | C22—N23 | 1.3851 (19) |
C7—H7A | 0.9300 | C22—H22A | 0.9300 |
C8—C12 | 1.342 (2) | C24—C29 | 1.3869 (18) |
C8—O9 | 1.3755 (18) | C24—C25 | 1.389 (2) |
O9—C10 | 1.3530 (17) | C25—C26 | 1.373 (2) |
C10—N11 | 1.296 (2) | C25—H25A | 0.9300 |
C10—C13 | 1.452 (2) | C26—C27 | 1.358 (3) |
N11—C12 | 1.370 (2) | C26—H26A | 0.9300 |
C12—H12A | 0.9300 | C27—C28 | 1.362 (3) |
C13—C14 | 1.394 (2) | C27—H27X | 0.9300 |
C13—C18 | 1.399 (2) | C28—C29 | 1.3688 (19) |
C14—C15 | 1.369 (3) | C28—H28A | 0.9300 |
C14—H14A | 0.9300 | C29—H29A | 0.9300 |
F1—C2—C3 | 117.53 (17) | C16—C15—H15A | 120.1 |
C28—C27—F1A | 118.98 (16) | C14—C15—H15A | 120.1 |
F1—C2—C7 | 121.08 (18) | C15—C16—C17 | 119.9 (2) |
C26—C27—F1A | 119.12 (16) | C15—C16—H16A | 120.1 |
C3—C2—C7 | 121.38 (15) | C17—C16—H16A | 120.1 |
C3—C2—H2X | 119.3 | C16—C17—C18 | 121.41 (18) |
C7—C2—H2X | 119.3 | C16—C17—H17A | 119.3 |
C2—C3—C4 | 119.32 (17) | C18—C17—H17A | 119.3 |
C2—C3—H3A | 120.3 | C17—C18—C13 | 118.84 (15) |
C4—C3—H3A | 120.3 | C17—C18—C19 | 117.16 (15) |
C3—C4—C5 | 121.03 (16) | C13—C18—C19 | 123.99 (14) |
C3—C4—H4A | 119.5 | N23—C19—O20 | 113.56 (12) |
C5—C4—H4A | 119.5 | N23—C19—C18 | 128.11 (13) |
C6—C5—C4 | 118.31 (15) | O20—C19—C18 | 118.25 (12) |
C6—C5—C8 | 121.79 (14) | C19—O20—C21 | 104.70 (10) |
C4—C5—C8 | 119.90 (14) | C22—C21—O20 | 106.61 (12) |
C7—C6—C5 | 120.87 (15) | C22—C21—C24 | 134.38 (13) |
C7—C6—H6A | 119.6 | O20—C21—C24 | 119.01 (11) |
C5—C6—H6A | 119.6 | C21—C22—N23 | 110.87 (13) |
C2—C7—C6 | 119.08 (16) | C21—C22—H22A | 124.6 |
C2—C7—H7A | 120.5 | N23—C22—H22A | 124.6 |
C6—C7—H7A | 120.5 | C19—N23—C22 | 104.25 (12) |
C12—C8—O9 | 106.02 (15) | C29—C24—C25 | 118.39 (14) |
C12—C8—C5 | 135.87 (16) | C29—C24—C21 | 122.43 (12) |
O9—C8—C5 | 118.11 (12) | C25—C24—C21 | 119.17 (13) |
C10—O9—C8 | 105.62 (11) | C26—C25—C24 | 120.40 (16) |
N11—C10—O9 | 112.90 (15) | C26—C25—H25A | 119.8 |
N11—C10—C13 | 127.55 (14) | C24—C25—H25A | 119.8 |
O9—C10—C13 | 119.52 (13) | C27—C26—C25 | 119.39 (16) |
C10—N11—C12 | 104.68 (14) | C27—C26—H26A | 120.3 |
C8—C12—N11 | 110.77 (16) | C25—C26—H26A | 120.3 |
C8—C12—H12A | 124.6 | C26—C27—C28 | 121.88 (14) |
N11—C12—H12A | 124.6 | C26—C27—H27X | 119.1 |
C14—C13—C18 | 118.53 (16) | C28—C27—H27X | 119.1 |
C14—C13—C10 | 116.98 (14) | C27—C28—C29 | 118.98 (16) |
C18—C13—C10 | 124.47 (13) | C27—C28—H28A | 120.5 |
C15—C14—C13 | 121.44 (18) | C29—C28—H28A | 120.5 |
C15—C14—H14A | 119.3 | C28—C29—C24 | 120.96 (13) |
C13—C14—H14A | 119.3 | C28—C29—H29A | 119.5 |
C16—C15—C14 | 119.88 (18) | C24—C29—H29A | 119.5 |
F1—C2—C3—C4 | 179.65 (17) | C16—C17—C18—C13 | −1.4 (3) |
F1—C2—C7—C6 | −179.66 (16) | C16—C17—C18—C19 | 178.80 (17) |
C7—C2—C3—C4 | −0.1 (3) | C14—C13—C18—C17 | 1.3 (2) |
C2—C3—C4—C5 | −0.7 (3) | C10—C13—C18—C17 | −176.83 (16) |
C3—C4—C5—C6 | 1.4 (3) | C14—C13—C18—C19 | −178.87 (15) |
C3—C4—C5—C8 | −179.17 (16) | C10—C13—C18—C19 | 3.0 (2) |
C4—C5—C6—C7 | −1.4 (2) | C17—C18—C19—N23 | 62.1 (2) |
C8—C5—C6—C7 | 179.17 (15) | C13—C18—C19—N23 | −117.72 (19) |
C3—C2—C7—C6 | 0.1 (3) | C17—C18—C19—O20 | −114.53 (16) |
C5—C6—C7—C2 | 0.7 (3) | C13—C18—C19—O20 | 65.7 (2) |
C6—C5—C8—C12 | −178.5 (2) | N23—C19—O20—C21 | 1.55 (17) |
C4—C5—C8—C12 | 2.1 (3) | C18—C19—O20—C21 | 178.63 (13) |
C6—C5—C8—O9 | 1.8 (2) | C19—O20—C21—C22 | −1.09 (15) |
C4—C5—C8—O9 | −177.70 (14) | C19—O20—C21—C24 | 179.70 (13) |
C12—C8—O9—C10 | −0.55 (17) | O20—C21—C22—N23 | 0.37 (18) |
C5—C8—O9—C10 | 179.30 (13) | C24—C21—C22—N23 | 179.41 (16) |
C8—O9—C10—N11 | 0.18 (18) | O20—C19—N23—C22 | −1.31 (19) |
C8—O9—C10—C13 | 178.55 (13) | C18—C19—N23—C22 | −178.03 (16) |
O9—C10—N11—C12 | 0.3 (2) | C21—C22—N23—C19 | 0.6 (2) |
C13—C10—N11—C12 | −177.95 (17) | C22—C21—C24—C29 | −154.69 (17) |
O9—C8—C12—N11 | 0.7 (2) | O20—C21—C24—C29 | 24.3 (2) |
C5—C8—C12—N11 | −179.07 (18) | C22—C21—C24—C25 | 24.4 (3) |
C10—N11—C12—C8 | −0.6 (2) | O20—C21—C24—C25 | −156.70 (13) |
N11—C10—C13—C14 | 10.2 (3) | C29—C24—C25—C26 | 1.0 (2) |
O9—C10—C13—C14 | −167.91 (14) | C21—C24—C25—C26 | −178.13 (15) |
N11—C10—C13—C18 | −171.60 (17) | C24—C25—C26—C27 | −0.9 (3) |
O9—C10—C13—C18 | 10.3 (2) | C25—C26—C27—C28 | 0.5 (3) |
C18—C13—C14—C15 | −0.4 (3) | C26—C27—C28—C29 | −0.3 (3) |
C10—C13—C14—C15 | 177.86 (16) | C27—C28—C29—C24 | 0.3 (2) |
C13—C14—C15—C16 | −0.5 (3) | C25—C24—C29—C28 | −0.7 (2) |
C14—C15—C16—C17 | 0.4 (3) | C21—C24—C29—C28 | 178.37 (13) |
C15—C16—C17—C18 | 0.5 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C16—H16A···F1i | 0.93 | 2.31 | 3.235 (2) | 170 |
C28—H28A···F1ii | 0.93 | 2.45 | 3.155 (2) | 133 |
Symmetry codes: (i) x+1, y+1, z; (ii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C24H15FN2O2 |
Mr | 382.38 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 295 |
a, b, c (Å) | 9.3158 (3), 10.8176 (3), 18.9449 (5) |
β (°) | 100.571 (3) |
V (Å3) | 1876.76 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.6 × 0.3 × 0.05 |
Data collection | |
Diffractometer | Oxford Diffraction GEMINI R ULTRA Ruby CCD |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2008) |
Tmin, Tmax | 0.956, 0.991 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 16242, 4263, 2707 |
Rint | 0.024 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.048, 0.120, 1.04 |
No. of reflections | 4263 |
No. of parameters | 266 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.11, −0.17 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2008), CrysAlis RED (Oxford Diffraction, 2008), SHELXS97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
C16—H16A···F1i | 0.93 | 2.31 | 3.235 (2) | 170 |
C28—H28A···F1ii | 0.93 | 2.45 | 3.155 (2) | 133 |
Symmetry codes: (i) x+1, y+1, z; (ii) x+1, y, z. |
Cg1, Cg2 and Cg3 are the centroids of the C2–C7, O9/C8/C12/N11/C10 and C13–C18 rings, respectively. CgI··· CgJ is the distance between the ring centroids. The interplanar angle is that between the planes of rings I and J. CgI_Perp is the perpendicuar distance of CgI from ring J. CgI_Offset is the distance between CgI and the perpendicular projection of CgJ on the ring I. |
I | J | CgI···CgJ | Interplanar angle | CgI_Perp | CgI_Offset |
2 | 1iii | 3.818 (1) | 2.0 (1) | 3.505 (1) | 1.514 |
1 | 2iii | 3.818 (1) | 2.0 (1) | 3.546 (1) | 1.415 |
2 | 3iv | 3.860 (1) | 10.9 (1) | 3.803 (1) | 0.661 |
3 | 2iv | 3.860 (1) | 10.9 (1) | 3.762 (1) | 0.864 |
Symmetry codes: (iii) -x, -y, -z; (iv) -x, -y+1, -z. |
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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.
Derivatives of 1,2-bis-(5-phenyl-oxazol-2-yl)benzene (ortho-POPOP) belong to the class of organic molecules, which exhibit efficient fluorescence with abnormally high Stokes shift (Doroshenko, 1996, 1999, 2000b). These molecules are prospective for their practical application as fluorescent probes, labels and chemosensors (Doroshenko, 2002a). Presence of two bulky heterocyclic substituents in 1,2-positions of the ortho-POPOP central benzene ring results in a significant sterical hindrance. This hindrance is manifested by a prominent non-planarity of ortho-POPOPs both in the crystalline state (Doroshenko, 1994) and in solutions (Doroshenko, 1996, 2002a). All the already examined crystal structures of the ortho-analogs of POPOP are characterized by essentially different angles between the planes of the central phenylene and each of the attached heterocyclic rings. Thus, two quasi-planar fragments containing two and three aromatic or heteroaromatic rings could be defined for the ortho-POPOPs molecules in crystals (Doroshenko, 1994, 1997, 2000b, 2002b).
The same arrangement is typical for the newly synthesized fluoro-substituted representative of this series (Fig. 1). The fluorine atom and the corresponding hydrogen are significantly disordered in the crystal structure over two sites with probabilities 0.627 (3) and 0.373 (3) and vice versa (Fig. 2). The title molecules are linked through a network of C–H···F hydrogen bonds (Tab. 1) and π-electron ring–π-electron ring interactions in the solid state (Fig. 3, Tab. 2).