Home The crystal structure of 3,6-di-tert-butyl-1,8-diiodo-9-methyl-9H-carbazole, C21H25I2N
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The crystal structure of 3,6-di-tert-butyl-1,8-diiodo-9-methyl-9H-carbazole, C21H25I2N

  • Wei-Jun Zhang EMAIL logo and Tao Zeng
Published/Copyright: April 16, 2020

Abstract

C21H25I2N, monoclinic, P21/m (no. 11), a = 10.2277(18) Å, b = 7.6698(13) Å, c = 13.142(2) Å, β = 93.819(2)°, V = 1028.6(3) Å3, Z = 2, Rgt(F) = 0.0261, wRref(F2) = 0.0680, T = 296(2) K.

CCDC no.: 1985680

The molecular structure is shown in the figure. 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:Yellow prism
Size:0.42 × 0.32 × 0.21 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:3.06 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:27.4°, >99%
N(hkl)measured, N(hkl)unique, Rint:11161, 2494, 0.019
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 2311
N(param)refined:157
Programs:Bruker [1], SHELX [2]
Table 2:

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

AtomxyzUiso*/Ueq
C10.4434(3)0.25000.2539(3)0.0338(7)
C20.5181(3)0.25000.1695(3)0.0367(7)
H20.47470.25000.10500.044*
C30.6557(4)0.25000.1763(3)0.0356(7)
C40.7181(3)0.25000.2733(3)0.0329(7)
H40.80910.25000.28120.039*
C50.6449(3)0.25000.3591(3)0.0312(7)
C60.5068(3)0.25000.3520(3)0.0311(6)
C70.5706(3)0.25000.5201(3)0.0314(7)
C80.6856(3)0.25000.4660(2)0.0299(6)
C90.8104(3)0.25000.5162(3)0.0325(7)
H90.88420.25000.47860.039*
C100.8247(3)0.25000.6218(3)0.0306(6)
C110.7100(3)0.25000.6750(3)0.0333(7)
H110.71840.25000.74590.040*
C120.5849(3)0.25000.6271(3)0.0322(7)
C130.7312(4)0.25000.0796(3)0.0451(9)
C140.8782(5)0.25000.1012(4)0.086(2)
H14A0.9096(10)0.1483(7)0.1405(12)0.103*
H14B0.9259(14)0.25000.0397(12)0.103*
C150.6955(6)0.0888(9)0.0174(4)0.131(3)
H15A0.60220.08400.00380.197*
H15B0.7245−0.01320.05480.197*
H15C0.73720.0934−0.04590.197*
C160.9617(3)0.25000.6761(3)0.0329(7)
C170.9589(4)0.25000.7928(3)0.0470(9)
H17A0.9152(17)0.1481(7)0.8160(19)0.056*
H17B1.0466(17)0.25000.827(3)0.056*
C181.0369(3)0.4121(4)0.6448(2)0.0452(6)
H18A1.04730.40870.57280.068*
H18B1.12150.41440.68100.068*
H18C0.98880.51490.66100.068*
C190.3263(4)0.25000.4745(4)0.087(2)
H19A0.2726(8)0.1489(7)0.4465(13)0.104*
H19B0.3080(17)0.25000.5464(10)0.104*
I10.23957(2)0.25000.21878(2)0.05099(11)
I20.43329(2)0.25000.72794(2)0.04864(11)
N10.4623(3)0.25000.4499(2)0.0346(6)

Source of material

At room temperature 0.5 mL of KOH (50%, 8.95 mmol) was added to a stirred solution of 1.0 g of 3,6-di-tert-butyl-9H-carbazole (3.58 mmol) and 0.115 g of tetrabutylammoniumbromid in 14 mL of DMSO. After stirred for half an hour, 0.33 mL of CH3I (5.37 mmol) was added dropwise. Then the mixture was warmed to 80 °C and stirred for 5 h. The reaction was quenched by ice water, and extracted by dichloromethane (3 × 50 mL). The organic layer was dried with Na2SO4 anhydride. The solvent was removed in vacuo. The residue was purified by recrystallization using ethanol to yield 3,6-di-tert-butyl-9-methyl-9H-carbazole as a white solid. To a solution of 3,6-di-tert-butyl-9-methyl-9H-carbazole (0.743 g, 1.47 mmol) in CH2Cl2 (5 mL) and CH3COOH (5 mL), N-iodosuccinimide (0.682 g, 3.03 mmol) was added, and the mixture was stirred at 20 °C for 16 h. CH2Cl2 was added, and the organic phase was washed with aqueous NaHCO3 and water. After drying over Na2SO4, the solution was filtered. Removal of the solvent in vacuo and column chromatography (hexane) afforded 3,6-di-tert-butyl-1,8-diiodo-9-methyl-9H-carbazole as a white solid. Crystals of the title compound were obtained by slow evaporation in CH2Cl2 within 1 week.

Experimental details

Hydrogen atoms were placed in their geometrically idealized positions and constrained to ride on their parent atoms. There is a disorder of one of the t-butyl groups (C14/C5; about 20%), which was not included in the refinement.

Comment

Carbazoles have been widely used as building blocks to construct organic light-emitting devices (OLEDs) and phosphorescence materials [3], [4], [5], [6]. Polycabazoles which are substituated at different positions showed completely different properties. Poly(2,7-carbazole)s generally have smaller band gaps than the corresponding poly(3,6-carbazole)s because of the linear conjugation of the 2,7-positions. Thus, the promising applications are in optoelectronic devices, such as organic light-emitting diodes (OLEDs), organic field effect transistors (OFETs), and organic photovoltaics. Poly(1,8-carbazole)s showed blue-light emission [7], [8]. Efficient synthetic routes for the 2,7-dihalogenocarbazole derivatives are reported [9], [10]. However, the synthesis of 1,8-dihalogenocarbazole derivatives have rarely been reported [11]. Herein, we reported the synthesis of 3,6-di-tert-butyl-1,8-diiodo-9-methyl-9H-carbazole, which is a educt for the syntheses of complex systems [12]. The single crystal structure (see the figure) verifies that all bond lengths are in normal ranges.

Acknowledgements

The work was supported by National Natural Science Foundation of China No. 21602055; Natural Science Foundation of Hunan Province No. 2017JJ3094 and Undergraduate Research Study and Innovative Experiment of Hunan Provincial (2016-636).

References

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Received: 2020-02-22
Accepted: 2020-03-19
Published Online: 2020-04-16
Published in Print: 2020-06-25

©2020 Wei-Jun Zhang et al., published by De Gruyter, Berlin/Boston

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

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  74. The crystal structure of poly[(μ10-5-carboxyisophthalato-κ10O)disodium], C9H4Na2O6
  75. The crystal structure of 3,5-difluoroisonicotinic acid, C6H3F2NO2
  76. The crystal structure of ethyl-1-(N-(adamantan-1-yl)-carbamothioyl)piperidine-4-carboxylate, C19H30N2O2S
  77. Crystal structure of 5-methyl-3-phenyl-1-tosyl-1,2,3,4-tetrahydropyridine, C19H21NO2S
  78. Crystal structure of bis((3-chlorosalicylidene)-ethylenediaminato-κ4N,N′,O,O′)nickel (II), C16H12Cl2NiN2O2
  79. Crystal structure of (E)-N′-(2-chloro-6-hydroxybenzylidene)-4-hydroxybenzohydrazide — dihydrofuran-2(3H)-one (1/1), C18H17ClN2O5
  80. Crystal structure of bis((3-bromosalicylidene)-ethylenediaminato-κ4N,N′,O,O′) nickel (II), C16H12Br2NiN2O2
  81. Crystal structure of trimethylsulfoxonium tetrachloridocobaltate(II) [(CH3)3SO]2CoCl4
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