Home Physical Sciences Crystal structure of 1,1′-(hexane-1,6-diyl)bis(3-ethyl-1H-imidazol-3-ium) bis(hexafluorido phosphate), C16H28F12N4P2
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Crystal structure of 1,1′-(hexane-1,6-diyl)bis(3-ethyl-1H-imidazol-3-ium) bis(hexafluorido phosphate), C16H28F12N4P2

  • Zhao Wen , Chen Jing , Xiong Wan-Ming EMAIL logo , Lan Ying-Dong and Nie Xu-Liang EMAIL logo
Published/Copyright: March 26, 2019

Abstract

C16H28N4 2(F6P), monoclinic, P21/n (no. 14), a = 8.7921(12) Å, b = 16.173(2) Å, c = 9.1376(12) Å, β = 111.13(10)°, V = 1211.1(3) Å3, Z = 2, Rgt(F) = 0.0475, wRref(F2) = 0.1262, T = 296(2) K.

CCDC no.: 1890717

The crystal structure is shown in the figure. Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Colourless block
Size:0.20 × 0.13 × 0.12 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.28 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:25.0°, >99%
N(hkl)measured, N(hkl)unique, Rint:8792, 2125, 0.025
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1691
N(param)refined:214
Programs:Bruker [1], SHELX [2]
Table 2:

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

AtomxyzUiso*/Ueq
C10.7923(3)0.12721(14)0.7499(3)0.0575(6)
H10.75520.13650.64220.069*
C20.7987(3)0.11004(16)0.9873(3)0.0672(7)
H20.76610.10541.07300.081*
C30.9506(3)0.10413(17)0.9903(3)0.0677(7)
H31.04350.09431.07850.081*
C41.0899(3)0.11948(17)0.7957(3)0.0705(7)
H4A1.17270.08220.86190.085*
H4B1.13400.17510.81490.085*
C51.0557(3)0.09795(17)0.6285(3)0.0692(7)
H5A1.15140.11120.60410.083*
H5B0.96720.13270.56320.083*
C61.0109(3)0.00919(17)0.5847(3)0.0653(7)
H6A0.9103−0.00350.60080.078*
H6B1.0958−0.02630.65330.078*
C70.5235(3)0.13844(18)0.7799(3)0.0698(7)
H7A0.47570.10410.83910.084*
H7B0.47510.12270.67030.084*
C80.4863(4)0.2258(2)0.7974(5)0.1031(12)
H8A0.53160.24110.90620.155*
H8B0.37010.23350.75890.155*
H8C0.53280.25990.73830.155*
N10.9453(2)0.11507(11)0.8413(2)0.0543(5)
N20.6998(2)0.12405(11)0.8359(2)0.0530(5)
P10.47114(8)0.12475(4)0.26721(7)0.0611(3)
F1Aa0.5814(5)0.0605(3)0.3840(5)0.117(2)
F2Ab0.3524(7)0.1910(4)0.1550(8)0.111(2)
F3Ac0.6207(8)0.1665(3)0.2408(10)0.120(3)
F4Ad0.3188(4)0.0808(3)0.2762(8)0.137(2)
F5Ad0.4945(8)0.1866(2)0.4046(3)0.1095(17)
F6Ae0.4712(16)0.0674(5)0.1278(9)0.128(3)
F1Bf0.609(2)0.100(3)0.235(3)0.236(15)
F2Bg0.366(4)0.1624(16)0.344(3)0.299(17)
F3Bh0.428(4)0.1858(10)0.1385(16)0.193(13)
F4Bi0.502(4)0.0617(12)0.397(2)0.195(17)
F5Bi0.631(2)0.1746(11)0.358(3)0.165(12)
F6Bj0.389(4)0.0635(7)0.140(2)0.179(10)
  1. aOccupancy: 0.779(10), bOccupancy: 0.694(14), cOccupancy: 0.666(16), dOccupancy: 0.770(9), eOccupancy: 0.62(2), fOccupancy: 0.221(10), gOccupancy: 0.306(14), hOccupancy: 0.334(16), iOccupancy: 0.230(9), jOccupancy: 0.38(2).

Source of material

1-Ethylimidazole (9.61 g, 0.1 mol) was dissolved in methylbenzene (20 mL), 1,6-dibromohexane (12.1 g, 0.05 mol) was quickly added under stirring. The mixture was reacted at 80 °C for 10 min, and then heated to 90 °C for 8 hours. After the reaction completed (monitored by TLC), a white solid was produced after cooling. The resulting suspension was filtered, crushed and washed with ethylacetate and diethyl ether 3 times respectively. The white powder intermediate (C6EM—Br) was dryed in vacuo (19.32 g, yield 89%). Then the intermediates (C6EM—Br)(2.17 g, 0.005 mol), potassium hexafluoro phosphate (2.48 g, 0.012 mol) was dissolved in water (36 mL) and methanol (4 mL). The mixture stirred well for 12 h at 95 °C and then cooled slowly. The crystals suitable for X-ray analysis were obtained.

Experimental details

All H atoms were included in calculated positions and refined as riding atoms, with C—H = 0.90−0.97 Å with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(C) for all other H atoms. The [PF6] anion is disordered over two positions (cf. the figure, Table 2), which is typical for many hexafluoridophosphates.

Comment

Room temperature ionic liquid (RTIL) offer many advantages from an environmental perspective such as being nonflammable and thermally stable, having a negligible vapor pressure, and having the potential for recyclability. Dicationic ionic liquid, with a large variety of tunable interactions, has been explored in the past decade [3], [4], [5]. Because of the unique physical and chemical properties of ionic liquids, ionic liquids have the unique potential advantages of biodiesel preparation. In recent years, various functional ionic liquids have been synthesised, and have been used to prepare biodiesel highly efficiently and environmental friendly [6], [7]. It was found that dinuclear alkaline ionic liquid bis-(3-methyl-1-imidazolium-)ethlyene dihydroxide ([MC2]OH) shows excellent catalytic efficiency. The highest conversion rate of cotton seed oil was up to 98.5%, and the stability and separation effect of the catalyst was ideal [8].

Recently, our group focused on the preparation of biodiesel catalyzed by ionic liquid [9], [10] and reported three crystal structures of 1,1′-(butane-1,4-diyl)bis(3-methyl-1H-imidazol-3-ium), bis(hexafluorophosphate), 1,1′-(hexane-1,6-diyl)bis(3-methyl-1H-imidazol-3-ium), bis(hexafluorophosphate) and 1,1′-(ethane-1,2-diyl)bis(3-ethyl-1H-imidazol-3-ium), bis(hexafluorophosphate) [11], [12], [13]. In order to find the ionic liquid catalyst with better catalytic efficiency, we were engaged in synthesising novel ionic liquid catalysts with imidazole.

Herein, we report the synthesis and structure of the bisimidazoles ionic liquid. Bond lengths and angles within the imidazloe ring are very similar to those given in the literature for diimidazole ionic liquid [14]. The title structure consists of one half of C2M2+ cation (1,1′-(ethane-1,2-diyl)bis(3-ethyl-1H-imidazol-3-ium)) and one [PF6] anion (cf. the figure). Two cationic 1-ethylimidazolium rings were bound to the both sides of ethyl group. The two imidazole rings are crystallographically dependant planar and parallel to each other. The torsion angle of C4—N1—C3—C2, C3—N1—C4—C5 and N1—C4—C5—C6 is 175.1(2)°, 156.7(2)° and 67.5(3)°, respectively.

Award Identifier / Grant number: 31760193

Funding source: Research Foundation of Educational Department of Jiangxi Province

Award Identifier / Grant number: GJJ160382, 160379

Funding statement: X-ray data were collected at Instrumental Analysis Center Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China. This work was supported by the National Natural Science Foundation of China (No. 31760193) and the Research Foundation of Educational Department of Jiangxi Province [GJJ160382, 160379].

References

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Received: 2018-11-23
Accepted: 2019-01-14
Published Online: 2019-03-26
Published in Print: 2019-06-26

© 2019 Zhao Wen 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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  68. Crystal structure of (E)-N-((3R,5S,10S, 13S,14S,17S)-17-((S)-1-(dimethylamino)ethyl)-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-3-yl)-2-methylbut-2-enamide – water – methanol (1/1/1), C29H54N2O3
  69. Crystal structure of methyl 2-(4-(3-(2,4-difluorophenyl)pyrazolo[1,5-a]pyrimidin-6-yl)phenyl)acetate, C21H15F2N3O2
  70. Crystal structure of poly[triaqua-(μ4-benzene-1,3,5-tricarboxylato-κ5O1,O2:O3:O4:O5)-(μ2-5-(3-pyridyl)tetrazolato-κ2N1:N3)dizinc(II)], C15H13N5O9Zn2
  71. Crystal structure of N-(3-methylphenyl)(propan-2-yloxy)carbothioamide, C11H15NOS
  72. Crystal structure of poly[(μ2-1,3-bis(imidazol-1-ylmethyl)benzene-κ2N:N′)(nitrato-κ1O)cadmium(II)] — water (2/1), C28H32CdN10O7
  73. Crystal structure of 4-phenyl-2,4-dihydro-3H-1,2,4-triazole-3-thione, C8H7N3S
  74. Crystal structure of benzyltrichloridobis(1H-pyrazole-κ2N)tin(IV), C13H15Cl3N4Sn
  75. Crystal structure of chlorido-4-fluorobenzyl-bis(2-methylquinolin-8-olato-κ2N,O)tin(IV), C27H22ClFN2O2Sn
  76. Crystal structure of tetrakis(O,O′-diisopropyldithiophosphato-κ2S,S′)-(μ2-1,2-bis(4-pyridylmethylene)hydrazine-κ2N:N′)zinc(II), C36H66N4O8P4S8Zn2
  77. Crystal structure of tetrabutylammonium 4,4-oxydibenzoate – boric acid – water (1/2/6) C46H98B2N2O17
  78. Redetermination of the crystal structure of catena-poly[[tribenzyltin(IV)]-(μ2-pyridine-4-carboxylato-κ2N:O)], C27H25NO2Sn
  79. The synthysis and crystal structure of cyclohexyl 5-amino-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-4-((trifluoromethyl)sulfinyl)-1H-pyrazole-3-carboxylate, C18H15N3Cl2F6O3S
  80. The crystal structure of 5,7-bis(2-hydroxyethoxy)-2-phenyl-4H-chromen-4-one, C19H18O6
  81. Synthesis and crystal structure of (±)-Ethyl 5′-(difluoromethyl)-2-oxo-4′,5′-dihydrospiro[indoline-3,3′-pyrazole]-4′-carboxylate, C14H13F2N3O3
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