Startseite Crystal structure of (1E,1′E)-4,4′-(9,9-diethyl-9H-fluorene-2,7-diyl)dibenzaldehyde dioxime, C31H28N2O2
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Crystal structure of (1E,1′E)-4,4′-(9,9-diethyl-9H-fluorene-2,7-diyl)dibenzaldehyde dioxime, C31H28N2O2

  • Ying-Hong Ma , Hong-Yan Zhao , Yu Tian , Yi Wu und Lei Wang ORCID logo EMAIL logo
Veröffentlicht/Copyright: 10. Oktober 2023

Abstract

C31H28N2O2, triclinic, P 1 (no. 2), a = 9.0809(9) Å, b = 9.2626(9) Å, c = 14.8540(15) Å, α = 93.574(8)°, β = 98.554(8)°, γ = 99.558(8)°, V = 99.558(8) Å3, Z = 2, R gt (F) = 0.0541, wR ref (F2) = 0.1424, T = 293(2) K.

CCDC no.: 2297783

The molecular structure is shown in the figure. Displacement ellipsoids are drawn at the 40 % probability level. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal: Colourless block
Size: 0.50 × 0.32 × 0.30 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.08 mm−1
Diffractometer, scan mode: SuperNova, ω
θmax, completeness: 29.1°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 9746, 5521, 0.025
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 3677
N(param)refined: 320
Programs: Olex2 [1], SHELX [2, 3]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

Atom x y z Uiso*/Ueq
O1 0.95431 (17) 0.34140 (16) 0.41397 (9) 0.0538 (4)
H1 1.016939 0.329062 0.457292 0.081*
O2 0.8604 (3) −1.4046 (2) −0.64363 (11) 0.0854 (6)
H2 0.901996 −1.467785 −0.619567 0.128*
N1 0.94996 (19) 0.23455 (18) 0.34110 (10) 0.0455 (4)
N2 0.8489 (2) −1.29613 (19) −0.57669 (11) 0.0505 (4)
C1 0.8971 (2) 0.0298 (2) 0.18022 (13) 0.0497 (5)
H1A 0.968374 0.011979 0.228069 0.060*
C2 0.8699 (2) −0.0590 (2) 0.09905 (13) 0.0495 (5)
H2A 0.923299 −0.135602 0.093451 0.059*
C3 0.7643 (2) −0.0363 (2) 0.02539 (12) 0.0392 (4)
C4 0.6877 (2) 0.0798 (2) 0.03721 (13) 0.0476 (5)
H4 0.617453 0.098946 −0.010806 0.057*
C5 0.7135 (2) 0.1674 (2) 0.11862 (13) 0.0505 (5)
H5 0.658762 0.242766 0.124802 0.061*
C6 0.8196 (2) 0.1450 (2) 0.19135 (12) 0.0400 (4)
C7 0.8469 (2) 0.2444 (2) 0.27519 (13) 0.0446 (5)
H7 0.787393 0.316246 0.280171 0.053*
C8 0.7342 (2) −0.1327 (2) −0.06144 (12) 0.0390 (4)
C9 0.7321 (2) −0.2835 (2) −0.06069 (12) 0.0398 (4)
H9 0.747484 −0.324380 −0.005177 0.048*
C10 0.7074 (2) −0.3730 (2) −0.14132 (11) 0.0366 (4)
C11 0.6874 (2) −0.3118 (2) −0.22579 (11) 0.0354 (4)
C12 0.6862 (2) −0.1626 (2) −0.22743 (12) 0.0426 (5)
H12 0.670435 −0.121764 −0.282926 0.051*
C13 0.7086 (2) −0.0745 (2) −0.14595 (13) 0.0444 (5)
H13 0.706498 0.025345 −0.147455 0.053*
C14 0.67471 (19) −0.42972 (19) −0.29884 (11) 0.0344 (4)
C15 0.68186 (19) −0.5615 (2) −0.25867 (11) 0.0347 (4)
C16 0.6827 (2) −0.6894 (2) −0.31057 (11) 0.0374 (4)
H16 0.685650 −0.776398 −0.282822 0.045*
C17 0.67916 (19) −0.6891 (2) −0.40501 (11) 0.0350 (4)
C18 0.6680 (2) −0.5578 (2) −0.44492 (12) 0.0395 (4)
H18 0.662138 −0.557004 −0.507926 0.047*
C19 0.6655 (2) −0.4286 (2) −0.39318 (12) 0.0392 (4)
H19 0.657710 −0.342482 −0.421102 0.047*
C20 0.6987 (2) −0.5385 (2) −0.15493 (11) 0.0373 (4)
C21 0.8424 (2) −0.5888 (2) −0.10902 (13) 0.0498 (5)
H21A 0.853585 −0.565556 −0.043512 0.060*
H21B 0.829584 −0.694816 −0.120295 0.060*
C22 0.9865 (3) −0.5198 (3) −0.14161 (16) 0.0681 (7)
H22A 0.977213 −0.542955 −0.206335 0.102*
H22B 1.070648 −0.557678 −0.110776 0.102*
H22C 1.002842 −0.415054 −0.128321 0.102*
C23 0.5595 (2) −0.6226 (2) −0.12067 (13) 0.0488 (5)
H23A 0.550497 −0.726523 −0.138796 0.059*
H23B 0.576579 −0.610095 −0.054397 0.059*
C24 0.4117 (3) −0.5753 (3) −0.15540 (16) 0.0612 (6)
H24A 0.403517 −0.566857 −0.219968 0.092*
H24B 0.408392 −0.481869 −0.124638 0.092*
H24C 0.329117 −0.647002 −0.143683 0.092*
C25 0.69764 (19) −0.8232 (2) −0.45854 (11) 0.0353 (4)
C26 0.7939 (2) −0.9130 (2) −0.42002 (12) 0.0420 (5)
H26 0.843610 −0.888367 −0.360266 0.050*
C27 0.8180 (2) −1.0369 (2) −0.46732 (13) 0.0462 (5)
H27 0.883256 −1.094308 −0.439487 0.055*
C28 0.7449 (2) −1.0768 (2) −0.55685 (12) 0.0407 (4)
C29 0.6485 (2) −0.9883 (2) −0.59586 (12) 0.0425 (5)
H29 0.598771 −1.013409 −0.655560 0.051*
C30 0.6246 (2) −0.8635 (2) −0.54820 (12) 0.0396 (4)
H30 0.559291 −0.806111 −0.576092 0.047*
C31 0.7709 (3) −1.2050 (2) −0.61017 (14) 0.0538 (6)
H31 0.728291 −1.220746 −0.671662 0.065*

1 Source of material

Raw materials 2,7-dibromo-9,9-diethyl-9H-fluorene (3.80 g, 10.0 mmol), 4-formylphenylboronic acid (3.31 g, 22 mmol), K2CO3 (8.28 g, 60 mmol) and Pd(PPh3)4 (0.76 g, 0.3 mmol) were introduced into 100 mL three-necked flask and degassed for three times. The mixture solution of toluene, ethanol and H2O (3:2:1, v/v/v 80 mL) was slowly added under N2 atmosphere. The mixture was stirred and refluxed under N2. The progress of reaction was monitored by thin-layer chromatography. After 40 h, the organic phase was evaporated under vacuum. The residue was purified by column chromatography with dichloromethane/petroleum ether (1:1 v/v) as eluent. The intermediate 4,4′-(9,9-diethyl-9H-fluorene-2,7-diyl)dibenzaldehyde was obtained as a light yellow powder.

The intermediate (0.431 g, 1 mmol) and hydroxylamine hydrochloride (0.139 g, 2 mmol) were dissolved in anhydrous methanol (20 mL). Two drops of triethylamine was added to the above solution as a catalyst. The mixture solution was refluxed for 4 h (monitored by TLC). When the reaction is complete, light gray precipitates were filtered and washed with cold methanol. The crystals of the title compound were grown by slow evaporation of its methanol/dichloromethane solution at room temperature.

2 Experimental details

Using Olex2 [1], the structure was solved with the SHELXT [2] structure solution program and refined with the SHELXL [3] refinement package. The C-bound H atoms were geometrically placed (C–H = 0.93–0.98 Å) and refined as riding with Uiso(H) = 1.2–1.5Ueq(C). The O-bound H atom was located in a difference map and refined with O–H = 0.82 Å, and with Uiso(H) = 1.5Ueq(O).

3 Comment

Fluorene and its derivatives have drawn much attention because of their wide variety of application in photophysics and photochemistry [4], [5], [6]. This unique structure leads to the result that fluorene segment are rigidly coplanar with the delocalized π-conjugated system. Simultaneously, the five-membered ring (C-9 position) and two benzene rings are easily modified by some functional groups and/or solubilizing groups. The functional structures make fluorene compounds showing high photoluminescence quantum yields, thermal stabilities and good solubility in water [7, 8]. However, the short excitation and emission wavelengths of fluorene dyes limit their wide applications in biological systems [9]. In order to solve this problem, it is important that the π-bridge conjugated systems of fluorene compounds will be extended by the structural modification [10]. Suitable substitutions can not only enhance the intensities of their absorption and emission peaks but also produce a red shift. Based on the above considerations, the title compound containing fluorene moiety and aromatic rings was synthesized by SUZUKI couple and Schiff base reaction [11].

X-ray single crystal diffraction analysis reveals that the title compound crystallizes in the triclinic space group P 1 with one independent molecule in the asymmetric unit (cf. the figure). In the molecular structure, the bond lengths of C7–N1 and C31–N2 are 1.269(2) and 1.268(3) Å, respectively, which belong to the typical C=N double bonds. Other bond lengths and bond angles are all in the normal ranges [12], [13], [14]. The groups C6–C7–N1–O1 and C28–C31–N2–O2 exhibit similar torsion angles with the value of −179.90(17)° and −177.6(2)°, respectively. According to the values of the torsion angles, it was found that the title compound adopts E,E′ configurations. In the title compound, the benzene rings in the fluorene fragment are almost coplanar with the dihedral angle of 5.75(4)°. Moreover, the aromatic rings are rotated relative to the fluorene segment with the dihedral angles between the aromatic ring and adjacent benzene ring of the fluorene moiety being 36.55(7)° and 39.04(8)°, respectively. Like most discrete organic molecules, hydrogen bond interactions play an important role in the self-assemble. In the crystal, adjacent molecules are linked to form one dimensional chain by O2–H2⋯O1 hydrogen bonds (H2⋯O1 = 1.9788(2) Å). The neighboring chains further interact with each other via ππ interactions to construct a double chain structure [centroid-to-centroid distance between the two C25–C26–C27–C28–C29–C30 rings = 4.0155(4) Å] along the a axis. Adjacent double chains are connected to form two dimensional layer structure through O1–H1⋯N2 hydrogen bonds (O1–H1⋯N2 = 2.0666(2) Å).

In the title compound, the oxime functional group could be chosen as a highly selective recognition group for ClO. Previous results have shown that the oxime can be oxidized into aldehyde group [15, 16]. The corresponding fluorescence intensity and position will undergo significant changes.


Corresponding author: Lei Wang, School of Pharmacy, The Key Laboratory of Prescription Effect and Clinical Evaluation of State Administration of Traditional Chinese Medicine of China, Binzhou Medical University, Yantai, 264003, P.R. China, E-mail:

  1. Research ethics: This work don’t involve research ethics.

  2. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  3. Competing interests: The authors declare no conflicts of interest regarding this article.

  4. Research funding: This work was supported by the Project of the Shandong Province Higher Educational Science and Technology Program (No. J18KA092).

  5. Data availability: All relevant data are within the paper and its Supporting Information files.

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Received: 2023-08-22
Accepted: 2023-09-27
Published Online: 2023-10-10
Published in Print: 2023-12-15

© 2023 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  43. Crystal structure of (2-phenylimino methylquinoline-κ 2 N,N′)-bis(1–phenylpyrazole-κ 2 C,N)-iridium(III) hexafluorophosphate, C34H26F6IrN6P
  44. Crystal structure of (3-hydroxy-4-methoxyphenyl)(pyrrolidin-1-yl)methanone, C12H15NO3
  45. The crystal structure of bis(trimethylsulfoxonium) catena-poly[µ2-hexabromido-indium(III)sodium(I)] C6H18O2S2NaInBr6
  46. Crystal structure of N-cyclopropyl-3-hydroxy-4-methoxybenzamide, C11H13NO3
  47. The crystal structure of (bis(benzimidazol-2-yl-methyl)amine-κ3N,N,N )-(dihydrogen L-malate-κ2O,O )copper(II) perchlorate dihydrate, CuC20H24ClN5O12
  48. Crystal structure of (1E,1′E)-4,4′-(9,9-diethyl-9H-fluorene-2,7-diyl)dibenzaldehyde dioxime, C31H28N2O2
  49. Crystal structure of diethyl 1,9-bis(4-fluorophenyl)-4,6-diphenylhexahydro-3H-2,7,3,5-(epimethanetriyliminomethanetriyl)cyclopenta [b]pyridine-3,7(2H)-dicarboxylate, C40H36F2N2O4
  50. Crystal structure of bis(benzene-1 carboxylato-O 3,5-carboxyl-κ1O)-[(5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-κ4N,N′,N′′,N′′′)nickel(II) ─ benzene-1,3,5-tricarboxylic acid ─ water (1/2/4), C52H66N4NiO28
  51. Crystal structure of 1,4-dibromo-2,5-bis(2-methoxyethoxy)benzene-1,4-diol, C12H16Br2O4
  52. Crystal structure of dicarbonyl[N,N′-(1,2-dimethyl-1,2-ethanediylidene)bis[2,6-bis(1-methylethyl)benzenamine]-N,N′]nickel(0), C30H40N2NiO2
  53. Crystal structure of 1,4-dibromo-2,5-bis(prop-2-yn-1-yloxy)benzene, C12H8Br2O2
  54. Crystal structure of O-(3-(benzo[d]thiazol-2-yl)naphthalen-2-yl) O-phenyl carbonothioate, C24H15NO2S2
  55. The crystal structure of (E)-4-fluoro-N′-(1-(4-hydroxyphenyl)propylidene)benzohydrazide, C16H15FN2O2
  56. Crystal structure of (E)-1-(benzo[d]thiazol-2-yl)-N-(4,5-dihydropyren-2-yl)methanimine, C24H16N2S
  57. Crystal structure of 3-((4-bromophenyl)thio)-1H-indole, C14H10BrNS
  58. Synthesis and crystal structure of 1-((7-hydroxy-3-(4-hydroxy-3-nitrophenyl)-4-oxo-4H-chromen-8-yl)methyl)piperidin-1-ium-4-carboxylate monohydrate, C22H22N2O9
  59. Synthesis and crystal structure of (3E,5S,10S,13S,14S,17Z)-17-ethylidene-10,13-dimethylhexadecahydro-3H-cyclopenta[α]phenanthren-3-one O-(methacryloyl) oxime, C50H74N2O4
  60. Crystal structure of the hydrogen storage active phase La12Mg46LiMn
  61. The crystal structure of the salt: 4-((1,3-dioxoisoindolin-2-yl)carbamoyl)pyridine-1-ium 2-carboxybenzoate, C14H10N3O3·C8H5O4
  62. Crystal structure of (2-(2-pyridine)-benzimidazole-κ2 N,N′)-bis(1-phenylpyrazole-κ2 C,N)iridium(III) hexafluorophosphate, C30H22F6IrN7P
  63. Crystal structure of dichlorido-bis[2-(2,4-difluorophenyl)pyridine-κ1N]platinum(II), C22H14Cl2F4N2Pt
  64. Crystal structure of (5R,8R,9R,10R,12R,13R,14R, 17S,17Z)-2-((3-fluoropyridin-4-yl)methylene)-12-hydroxy-4,4,8,10,14-pentamethyl-17-((R)-2,6,6-trimethyltetrahydro-2H-pyran-2-yl)hexadecahydro-3H-cyclopenta[a]phenanthren-3-one, C36H52FNO3
Heruntergeladen am 7.9.2025 von https://www.degruyterbrill.com/document/doi/10.1515/ncrs-2023-0385/html
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