Home Crystal structure of 1,1′-(hexane-1,6-diyl)bis(3-methyl-1H-imidazol-3-ium) bis(hexafluoro phosphate), C14H24F12N4P2
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Crystal structure of 1,1′-(hexane-1,6-diyl)bis(3-methyl-1H-imidazol-3-ium) bis(hexafluoro phosphate), C14H24F12N4P2

  • Nie Xu-Liang , Kong Juan-Hua , Chen Jing , Chen Jin-Zhu and Xiong Wan-Ming EMAIL logo
Published/Copyright: September 27, 2016

Abstract

C14H24F12N4P2, triclinic, P1̅ (no. 2), a = 8.8173(12) Å, b = 8.8845(12) Å, c = 9.1494(12) Å, α = 62.2060(10)°, β = 64.2980(10)°, γ = 89.661(2)°, V = 553.72(13) Å3, Z = 1, Rgt(F) = 0.0746, wRref(F2) = 0.2038, T = 296 K.

CCDC no.:: 1502428

A part of the title crystal structure is shown in the figure. Tables 1 and 2 contain details of the measurement method and a list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Colourless blocks Size 0.20 × 0.18 × 0.16 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:3.1 cm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
2θmax, completeness:51°, >99%
N(hkl)measured, N(hkl)unique, Rint:4276, 2044, 0.027
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1821
N(param)refined:188
Programs:SHELX [9], Bruker programs [10]
Table 2:

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

AtomxyzUiso*/Ueq
P10.25471(11)0.26293(11)0.41180(12)0.0581(8)
C50.1407(4)0.7015(4)0.9532(4)0.0522(10)
H5A0.24990.66730.92110.063*
H5B0.14390.78770.83640.063*
C10.4002(4)1.0051(4)0.8052(4)0.0506(10)
H10.43220.95300.73200.061*
C6−0.0073(4)0.5416(4)1.0578(4)0.0528(10)
H6A−0.00920.45521.17370.063*
H6B−0.11650.57591.09210.063*
C40.1204(4)0.7822(4)1.0702(5)0.0584(11)
H4A0.00850.81081.10710.070*
H4B0.12150.69671.18470.070*
C30.2583(4)1.0552(4)1.0348(5)0.0559(10)
H30.17421.04291.14810.067*
C20.4023(4)1.1861(4)0.9037(5)0.0562(11)
H20.43641.28140.90910.067*
C70.6532(5)1.2621(5)0.5837(6)0.0733(13)
H7A0.62891.35340.49260.110*
H7B0.70991.19060.53480.110*
H7C0.72751.31360.60870.110*
N10.2577(3)0.9423(3)0.9708(3)0.0462(9)
N20.4901(3)1.1531(3)0.7598(4)0.0505(10)
F20.2620(5)0.3025(6)0.5617(5)0.1278(15)
F10.2518(7)0.2274(6)0.2650(6)0.1673(19)
F3Aa0.4232(16)0.193(3)0.403(2)0.131(7)
F5Ab0.147(2)0.0888(11)0.6038(12)0.144(5)
F4Ac0.0800(18)0.320(3)0.4532(18)0.126(8)
F6Ad0.365(3)0.4384(15)0.2440(11)0.182(11)
F3Be0.305(4)0.0866(16)0.4778(19)0.171(10)
F6Bf0.4493(14)0.344(4)0.310(3)0.181(8)
F5Bg0.0673(14)0.173(5)0.525(4)0.212(17)
F4Bh0.217(5)0.443(2)0.333(4)0.181(13)

aOccupancy: 0.50(3); bOccupancy: 0.55(3); cOccupancy: 0.49(3); dOccupancy: 0.57(3); eOccupancy: 0.50(3); fOccupancy: 0.43(3), gOccupancy: 0.45(3); hOccupancy: 0.51(3).

Source of material

1-Methylimidazole (22.96 g, 0.28 mol), 1,3-dibromohexane (33.88 g, 0.14 mol) was quickly added in 40 mL acetonitrile, the mixture was stirred well for 10 h at 80°. After the reaction completed (monitored by TLC), a white solid was produced. The resulting suspension was filtered, crushed and washed with ethyl acetate and diethyl ether five times respectively. The white powder intermediates (C6M—Br) dryed in vacuo with the yield 90%. Then the intermediates (C6M—Br)(2.04 g, 0.005 mol), potassium hexafluoro phosphate (2 g, 0.011 mol) was dissolved in deionized water (30 mL). The mixture stirred well for 10 h at 70° and then cooled slowly. Colourless crystals were produced and filtered off, washed with deionized water until no white solids were detected with silver nitrate in the filter. Crystals suitable for X-ray analysis were obtained after natural air dryed with the yield 65%.

Experimental details

All H atoms were included in calculated positions and refined as riding atoms, with C—H = 0.96–0.97 Å with Uiso(H) = 1.5 Ueq(C) for methyl H atoms and 1.2 Ueq(C) for all other H atoms. The PF6-counter anion is disordered (cf. the figure). In the figure both parts of the disordered motif is shown.

Discussion

Ionic liquids, as a new environmentally friendly solvent and acid base catalyst, owing to the advantages of adjustable structure, high catalytic efficiency, mild conditions, etc., has been widely used in catalytic science, electrochemistry, environmental science, extraction and separation, biomass energy, resource conversion and other fields , [1], [2], [3]. Because of the unique physical and chemical properties of ionic liquids, they have potential advantages in biodiesel preparation. Various ionic liquids have been used to prepare biodiesel , [4], [5]. Liang et al. found that dinuclear alkaline ionic liquid [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 very ideal [6].

Recently, our group still focused on the preparation of biodiesel catalyzed by ionic liquid [7]. In order to find the ionic liquid catalysts with better catalytic efficiency, we were engaged in synthesising novel ionic liquid catalysts with imidazole. All bond lengths and angles within the imidazole ring are very similar to those given in the literature for diimidazole ionic liquid [8]. The centrosymmetric cation C14H24N42+·(C6M2+) is depicted in the figure. The asymmetric unit of the title structure consists of one half of a C6M2+ cations, and one PF6- anions. The imidazole ring is almost crystallographically dependant planar. The torsion angle of C5—C4—N1—C1 and C6—C5—C4—N1 is 8.266° and 177.624°, respectively.

Award Identifier / Grant number: 51306081

Funding statement: This work was supported by the National Natural Science Foundation of China (No. 51306081). X-ray data were collected at Instrumental Analysis Center Nanchang Hangkong University, Nanchang, 330063, People's Republic of China.

Acknowledgements:

This work was supported by the National Natural Science Foundation of China (No. 51306081). X-ray data were collected at Instrumental Analysis Center Nanchang Hangkong University, Nanchang, 330063, People's Republic of China.

References

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Received: 2016-5-12
Accepted: 2016-9-2
Published Online: 2016-9-27
Published in Print: 2017-1-1

©2016 Nie Xu-Liang et al., published by De Gruyter.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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