Home Physical Sciences The crystal structure of 1-(2-(2-(imidazo[1,5-a]pyridine-4-ium)ethoxy)ethyl)-imidazo[1,5-a]pyridine-4-ium bis(hexafluorophosphate) — acetonitrile (1/1), C18H20ON4F12P2
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The crystal structure of 1-(2-(2-(imidazo[1,5-a]pyridine-4-ium)ethoxy)ethyl)-imidazo[1,5-a]pyridine-4-ium bis(hexafluorophosphate) — acetonitrile (1/1), C18H20ON4F12P2

  • Zhao Bo ORCID logo , Zhong Yue and Luo Jiewei EMAIL logo
Published/Copyright: October 18, 2019

Abstract

C18H20ON4F12P2, triclinic, P1̄ (no. 2), a = 9.393(8) Å, b = 10.894(10) Å, c = 13.716(12) Å, α = 107.741(14)°, β = 100.379(15)°, γ = 92.869(14)°, V = 1306.7(19) Å3, Z = 2, Rgt(F) = 0.0916, wRref(F2) = 0.1970, T = 296(2) K.

CCDC no.: 1957190

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 block
Size:0.28 × 0.24 × 0.21 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.28 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:26.0°, 98%
N(hkl)measured, N(hkl)unique, Rint:7070, 5041, 0.021
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 3424
N(param)refined:362
Programs:Bruker [1], SHELX [2], [3]
Table 2:

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

AtomxyzUiso*/Ueq
P10.98375(16)0.63041(14)0.23466(11)0.0584(4)
P20.46505(16)0.28564(16)0.25893(12)0.0612(4)
C10.2475(6)0.8786(6)0.5351(4)0.0629(14)
H1A0.24290.81530.56740.075*
C20.1795(6)0.9846(6)0.5638(4)0.0638(15)
H2A0.12850.99530.61740.077*
C30.1836(6)1.0806(6)0.5146(4)0.0628(14)
H3A0.13491.15330.53590.075*
C40.2572(6)1.0680(5)0.4372(4)0.0577(13)
H4A0.25871.13120.40450.069*
C50.3317(5)0.9586(5)0.4061(3)0.0445(10)
C60.4161(5)0.9168(5)0.3336(4)0.0532(12)
H6A0.44010.95960.28860.064*
C70.4038(6)0.7708(5)0.4126(4)0.0570(13)
H7A0.41770.69620.43100.068*
C80.5481(6)0.7222(6)0.2722(4)0.0698(16)
H8A0.59660.66640.30750.084*
H8B0.62230.77820.26060.084*
C90.4575(7)0.6411(6)0.1694(4)0.0687(16)
H9A0.51570.58060.13080.082*
H9B0.37660.59170.18050.082*
C100.3182(7)0.6503(5)0.0138(4)0.0669(15)
H10A0.24090.59560.02350.080*
H10B0.37750.5949−0.02810.080*
C110.2538(6)0.7404(6)−0.0418(4)0.0656(15)
H11A0.32990.8050−0.04010.079*
H11B0.21310.6916−0.11440.079*
C12−0.0005(6)0.7586(5)−0.0179(4)0.0599(13)
H12A−0.04120.6805−0.06860.072*
C130.1587(6)0.9222(5)0.0839(4)0.0540(12)
H13A0.24650.97470.11430.065*
C140.0270(5)0.9480(5)0.1081(3)0.0492(11)
C15−0.0254(7)1.0511(6)0.1782(4)0.0637(15)
H15A0.03851.12190.22310.076*
C16−0.1679(7)1.0460(7)0.1797(5)0.0745(18)
H16A−0.20271.11450.22510.089*
C17−0.2655(7)0.9389(8)0.1136(5)0.081(2)
H17A−0.36360.93720.11680.098*
C18−0.2206(7)0.8397(7)0.0466(5)0.0750(17)
H18A−0.28620.76920.00330.090*
C200.9042(8)0.6280(7)0.5665(5)0.0747(17)
F11.0479(9)0.6627(6)0.3484(4)0.204(4)
F20.8493(7)0.5653(9)0.2505(7)0.226(4)
F30.9191(9)0.7599(6)0.2546(6)0.205(3)
F40.9248(10)0.5974(6)0.1186(4)0.224(4)
F51.1098(7)0.7115(7)0.2189(5)0.181(3)
F61.0356(11)0.5017(6)0.2133(6)0.244(5)
F70.4714(7)0.2580(6)0.3636(4)0.155(2)
F80.2977(5)0.2583(6)0.2331(5)0.153(2)
F90.4601(6)0.4319(4)0.3194(4)0.1268(17)
F100.6357(4)0.3052(5)0.2833(4)0.1277(17)
F110.4714(6)0.1394(4)0.1975(5)0.144(2)
F120.4669(6)0.3174(6)0.1571(4)0.1410(19)
N10.3256(4)0.8648(4)0.4554(3)0.0521(10)
N20.4579(4)0.8025(4)0.3393(3)0.0511(10)
N3−0.0719(5)0.8437(4)0.0428(3)0.0568(11)
N40.1389(5)0.8058(4)0.0075(3)0.0526(10)
O10.4045(4)0.7233(3)0.1117(3)0.0572(9)
C190.7867(9)0.5302(8)0.5119(7)0.118(3)
H19A0.69680.56850.51010.177*
H19B0.78460.46630.54680.177*
H19C0.79910.48980.44170.177*
N50.9969(8)0.7058(7)0.6081(5)0.105(2)

Source of material

The title compound was synthesized by the reaction of 2-(2-amino-ethoxy)-ethanamine (0.29 mL, 2 mmol), formalin (0.58 mL, 6 mmol) and picolinaldehyde (0.38 mL, 4 mmol) in ethanol [4]. Hydrogen bromide (2 equiv) was added to the reaction mixture, which was stirred at room temperature for 12 h. Following salt metathesis with NH4PF6 in acetonitrile, a yellow solid was obtained, 0.98 g. Yield: 82%. 1H NMR (400 MHz, DMSO) δ [ppm] 9.62 (s, 2H), 8.54 − 8.45 (m, 2H), 8.13 (s, 2H), 7.75 (d, J = 9.3 Hz, 2H), 7.28 − 7.11 (m, 4H), 4.67 (t, J = 4.8 Hz, 4H), 3.90 (t, J = 4.8 Hz, 4H). 13C NMR (100 MHz, DMSO) δ [ppm] 129.40, 127.09, 125.04, 124.47, 118.49, 117.92, 114.05, 68.55, 50.36.

Experimental details

The structure was solved by Direct Methods. The largest residual density peaks are near the PF6 anions indicating a small additional disorder of these ions.

Comment

Despite a massive number of NHCs were reported using a variety of synthetic methods [5], [6], it remains a challenge to get NHCs with tunable electronic and steric properties. Many NHCs containing the imidazo[1,5-a]pyridine have been synthesized [7], [8], [9], [10], [11].

Geometric parameters in the title molecule are in the expected ranges. In detail the bond lengths of O1-C9 and O1-C10 are 1.419(6) and 1.409(6) Å, respectively, and the angle of C9-O1-C10 is 110.8(4)°. The supramolecular assembly in title compound depends on the combination of C-H⋯F hydrogen-bonding and π-π stacking. The imidazolium cation and hexafluoro phosphate anions are connected by C-H⋯F hydrogen-bond (d(H acceptor) and d(donor⋯ acceptor), donor-H⋯ acceptor): C12-H12A⋯ F6i (2.35, 3.207(8) Å), 153.0°; C13-H13A⋯ F11ii (2.55, 3.473(8) Å), 173.8°; C18-H18A⋯ F12iii (2.42, 3.232(9) Å), 146.4°. Symmetry codes: i = −x + 1, −y + 1, −z; ii = x, 1 + y, z; iii = −x, 1 − y, −z. In the π-π stacking, the aromatic rings of the molecules, which are strictly parallel, have an inter-planar spacing of 3.603(2) and 3.599(2) Å, respectively.

Funding source: Project of Nanchong Science and Technology Bureau

Award Identifier / Grant number: 18SXHZ0133

Funding source: University Innovation and Entrepreneurship Training Program of Sichuan

Award Identifier / Grant number: 106342018146

Funding statement: We gratefully acknowledge support by Project of Nanchong Science and Technology Bureau (18SXHZ0133); University Innovation and Entrepreneurship Training Program of Sichuan (106342018146).

References

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Received: 2019-08-07
Accepted: 2019-10-02
Published Online: 2019-10-18
Published in Print: 2019-12-18

©2019 Zhao Bo 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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  73. The crystal structure of 3-nitro-4-(p-tolylamino)-2H-chromen-2-one, C16H12N2O4
  74. The crystal structure of 1,2-bis((4-methoxyphenyl)ethynyl)benzene, C24H18O2
  75. Crystal structure of a low-temperature (100 K) polymorph of catena-poly[(μ2-4,4′-bipyridine-κ2N,N′)-bis(O,O′-diethyldithiophosphato-κ1S)zinc(II)], C18H28N2O4P2S4Zn
  76. The pseudosymmetric low temperature polymorph of catena-poly[(μ2-4,4′-bipyridyl-κN,N′)-bis(O,O′-diethyldithiophosphato-κS)-cadmium(II)], {C18H28CdN2O4P2S4}n
  77. Crystal structure of 3-iodophthalic acid, C8H5IO4
  78. The crystal structure of tert-butyl (tert-butoxy(oxo)methyl)(5-bromo-2-fluorophenyl)carbamate, C16H21BrFNO4
  79. The crystal structure of bis(μ2-5,7-dichloroquinolin-8-olato-κ3N,O:O)-tetrakis(5,7-dichloroquinolin-8-olato-κ2N,O)bis(methanol-κ1O)dieuropium(III) — toluene (1/1), C63H39Cl12Eu2N6O8
  80. Crystal structure of dichlorido-(N′-(1-(3-ethylpyrazin-2-yl)ethylidene)-4-methoxybenzohydrazide-κ3N,N′,O)cadmium(II), C16H18N4O2Cl2Cd
  81. A redetermination of the crystal structure of catena-poly[(bis(O,O′-isopropyl dithiophosphato-κ2S,S′)-(μ2-1,2-bis(3-pyridylmethylene)hydrazine-κ2N,N′)cadmium(II)], {C24H38CdN4O4P2S4}n
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