organic compounds
Dimethylammonium perchlorate 18-crown-6 monohydrate clathrate
aOrdered Matter Science Research Center, College of Chemistry and Chemical, Engineering, Southeast University, Nanjing 211189, People's Republic of China
*Correspondence e-mail: gjz@seu.edu.cn
The reaction of dimethylamine, 18-crown-6, and perchloric acid in methanol yields the title compound, C2H8N+·ClO4−·C12H24O6·H2O. The dimethylammonium cation and the water molecule interact with the 18-crown-6 unit: N—H⋯O hydrogen bonds are formed between the ammonium NH2+ group and four O atoms of the crown ether, while the water molecule on the other side of 18-crown-6 ring forms O—H⋯O hydrogen bonds with two other O atoms of the crown ether. All conventional donors and acceptors in the cations are thus engaged in hydrogen bonding. The ClO4− anion is disordered over two sites, and occupancies for the disordered O atoms were fixed at 0.5. In the crystal, the cations and anions are arranged in alternating layers.
Related literature
For the similar structure, 18-crown-6 clathrate, see: Pedersen (1967). For the ferroelectric properties of related materials, see: Fu et al. (2007); Ye et al. (2009); Zhang et al. (2009).
Experimental
Crystal data
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Data collection: CrystalClear (Rigaku, 2005); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: PRPKAPPA (Ferguson, 1999).
Supporting information
10.1107/S1600536810023421/bh2290sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536810023421/bh2290Isup2.hkl
Dimethylamine (2 mmol, 0.09 g) and an excess of perchloric acid (3 mmol, 0.302 g) were dissolved in methanol. Then, 18-crown-6 (2 mmol, 0.528 g) was added to the mixture. The precipitate was filtered and washed with a small amount of methanol. Single crystals suitable for X-ray diffraction were obtained by slow evaporation of a methanol solution at room temperature over two days.
All C-bonded H atoms were placed geometrically, with the C—H distances ranging from 0.96 to 0.97 Å. Isotropic displacement parameters were calculated as Uiso(H) = 1.2Ueq(C) for methylene groups and Uiso(H) = 1.5Ueq(C) for methyl groups. H atoms bonded to N and O atoms were found in a difference map and refined as riding atoms and with Uiso(H) = 1.5Ueq(carrier atom). O atoms for the perchlorate ion were splited over two sites, with equal occupancies fixed to 0.5. Cl—O bond lengths were restrained, as well as displacement parameters for disordered O atoms (51 restraints).
Data collection: CrystalClear (Rigaku, 2005); cell
CrystalClear (Rigaku, 2005); data reduction: CrystalClear (Rigaku, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: PRPKAPPA (Ferguson, 1999).C2H8N+·ClO4−·C12H24O6·H2O | Dx = 1.307 Mg m−3 |
Mr = 427.87 | Melting point: 353 K |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 2814 reflections |
a = 10.684 (2) Å | θ = 3.2–27.5° |
b = 13.954 (3) Å | µ = 0.23 mm−1 |
c = 14.583 (3) Å | T = 293 K |
V = 2174.1 (8) Å3 | Block, white |
Z = 4 | 0.4 × 0.3 × 0.2 mm |
F(000) = 920 |
Rigaku SCXmini diffractometer | 4973 independent reflections |
Radiation source: fine-focus sealed tube | 2814 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.070 |
Detector resolution: 13.6612 pixels mm-1 | θmax = 27.5°, θmin = 3.2° |
ω scans | h = −13→13 |
Absorption correction: multi-scan CrystalClear (Rigaku, 2005) | k = −18→18 |
Tmin = 0.955, Tmax = 0.955 | l = −18→18 |
22574 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.058 | H-atom parameters constrained |
wR(F2) = 0.171 | w = 1/[σ2(Fo2) + (0.0794P)2 + 0.2447P] where P = (Fo2 + 2Fc2)/3 |
S = 1.00 | (Δ/σ)max = 0.007 |
4973 reflections | Δρmax = 0.29 e Å−3 |
283 parameters | Δρmin = −0.15 e Å−3 |
51 restraints | Absolute structure: Flack (1983), 2168 Friedel pairs |
0 constraints | Absolute structure parameter: 0.02 (10) |
Primary atom site location: structure-invariant direct methods |
C2H8N+·ClO4−·C12H24O6·H2O | V = 2174.1 (8) Å3 |
Mr = 427.87 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 10.684 (2) Å | µ = 0.23 mm−1 |
b = 13.954 (3) Å | T = 293 K |
c = 14.583 (3) Å | 0.4 × 0.3 × 0.2 mm |
Rigaku SCXmini diffractometer | 4973 independent reflections |
Absorption correction: multi-scan CrystalClear (Rigaku, 2005) | 2814 reflections with I > 2σ(I) |
Tmin = 0.955, Tmax = 0.955 | Rint = 0.070 |
22574 measured reflections |
R[F2 > 2σ(F2)] = 0.058 | H-atom parameters constrained |
wR(F2) = 0.171 | Δρmax = 0.29 e Å−3 |
S = 1.00 | Δρmin = −0.15 e Å−3 |
4973 reflections | Absolute structure: Flack (1983), 2168 Friedel pairs |
283 parameters | Absolute structure parameter: 0.02 (10) |
51 restraints |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
Cl1 | 0.98649 (9) | 0.31614 (6) | 0.61639 (6) | 0.0683 (3) | |
O1 | 0.26118 (19) | 0.62910 (16) | 0.62120 (17) | 0.0615 (6) | |
O4 | 0.72647 (19) | 0.61810 (16) | 0.58783 (16) | 0.0580 (6) | |
O5 | 0.6370 (2) | 0.58013 (18) | 0.76505 (16) | 0.0661 (7) | |
O2 | 0.3466 (2) | 0.56628 (17) | 0.44918 (16) | 0.0631 (6) | |
O3 | 0.6070 (2) | 0.51865 (17) | 0.43975 (16) | 0.0659 (7) | |
O6 | 0.3742 (2) | 0.54342 (19) | 0.77918 (17) | 0.0686 (7) | |
C6 | 0.1812 (3) | 0.6189 (3) | 0.5450 (3) | 0.0666 (10) | |
H6A | 0.1124 | 0.6640 | 0.5498 | 0.080* | |
H6B | 0.1466 | 0.5547 | 0.5439 | 0.080* | |
C12 | 0.8060 (3) | 0.6151 (3) | 0.6658 (3) | 0.0690 (10) | |
H12A | 0.8769 | 0.6575 | 0.6567 | 0.083* | |
H12B | 0.8375 | 0.5506 | 0.6745 | 0.083* | |
C5 | 0.2518 (3) | 0.6370 (3) | 0.4595 (3) | 0.0655 (9) | |
H5A | 0.1954 | 0.6348 | 0.4074 | 0.079* | |
H5B | 0.2895 | 0.7001 | 0.4618 | 0.079* | |
C7 | 0.1976 (3) | 0.6136 (3) | 0.7052 (3) | 0.0729 (11) | |
H7A | 0.1592 | 0.5507 | 0.7050 | 0.088* | |
H7B | 0.1320 | 0.6611 | 0.7126 | 0.088* | |
C11 | 0.7341 (4) | 0.6456 (3) | 0.7479 (3) | 0.0683 (10) | |
H11A | 0.7893 | 0.6487 | 0.8006 | 0.082* | |
H11B | 0.6993 | 0.7090 | 0.7378 | 0.082* | |
C3 | 0.5202 (4) | 0.5127 (3) | 0.3647 (2) | 0.0742 (11) | |
H3A | 0.4825 | 0.4494 | 0.3642 | 0.089* | |
H3B | 0.5655 | 0.5207 | 0.3075 | 0.089* | |
C2 | 0.7006 (4) | 0.5896 (3) | 0.4281 (3) | 0.0743 (11) | |
H2A | 0.6621 | 0.6525 | 0.4247 | 0.089* | |
H2B | 0.7456 | 0.5784 | 0.3714 | 0.089* | |
C4 | 0.4200 (4) | 0.5857 (3) | 0.3699 (2) | 0.0745 (10) | |
H4A | 0.4563 | 0.6493 | 0.3741 | 0.089* | |
H4B | 0.3681 | 0.5830 | 0.3154 | 0.089* | |
C10 | 0.5660 (4) | 0.6078 (3) | 0.8436 (3) | 0.0758 (11) | |
H10A | 0.5341 | 0.6724 | 0.8357 | 0.091* | |
H10B | 0.6185 | 0.6066 | 0.8979 | 0.091* | |
C9 | 0.4614 (4) | 0.5398 (3) | 0.8540 (3) | 0.0822 (12) | |
H9A | 0.4948 | 0.4754 | 0.8587 | 0.099* | |
H9B | 0.4174 | 0.5539 | 0.9106 | 0.099* | |
C1 | 0.7897 (3) | 0.5862 (3) | 0.5074 (3) | 0.0697 (10) | |
H1A | 0.8195 | 0.5211 | 0.5161 | 0.084* | |
H1B | 0.8612 | 0.6270 | 0.4952 | 0.084* | |
C8 | 0.2889 (4) | 0.6209 (3) | 0.7833 (3) | 0.0818 (12) | |
H8A | 0.3340 | 0.6810 | 0.7795 | 0.098* | |
H8B | 0.2441 | 0.6194 | 0.8412 | 0.098* | |
O7 | 1.0420 (16) | 0.4009 (9) | 0.6144 (13) | 0.197 (9) | 0.50 |
O8 | 1.0022 (13) | 0.2735 (7) | 0.6991 (6) | 0.140 (5) | 0.50 |
O9 | 0.8759 (8) | 0.3033 (10) | 0.5711 (8) | 0.152 (4) | 0.50 |
O10 | 1.0765 (12) | 0.2850 (9) | 0.5452 (6) | 0.172 (4) | 0.50 |
O7' | 0.9855 (17) | 0.4068 (8) | 0.6012 (13) | 0.186 (8) | 0.50 |
O8' | 0.960 (2) | 0.2425 (11) | 0.5730 (13) | 0.276 (10) | 0.50 |
O9' | 1.072 (2) | 0.2849 (18) | 0.6660 (13) | 0.313 (13) | 0.50 |
O10' | 0.8799 (10) | 0.3385 (8) | 0.6824 (10) | 0.184 (5) | 0.50 |
N1 | 0.4833 (3) | 0.45369 (18) | 0.61194 (19) | 0.0711 (9) | |
H1AA | 0.4615 | 0.5025 | 0.6643 | 0.107* | |
H1BB | 0.5139 | 0.4836 | 0.5651 | 0.107* | |
O20 | 0.9938 (2) | 0.7613 (2) | 0.3947 (2) | 0.0993 (10) | |
H20A | 0.9312 | 0.7809 | 0.3782 | 0.149* | |
H20B | 1.0611 | 0.8000 | 0.3942 | 0.149* | |
C98 | 0.5941 (4) | 0.3948 (3) | 0.6317 (4) | 0.0945 (14) | |
H98A | 0.6657 | 0.4356 | 0.6395 | 0.142* | |
H98B | 0.6087 | 0.3515 | 0.5817 | 0.142* | |
H98C | 0.5803 | 0.3589 | 0.6870 | 0.142* | |
C99 | 0.3696 (4) | 0.3968 (3) | 0.6010 (3) | 0.0905 (13) | |
H99A | 0.3009 | 0.4383 | 0.5861 | 0.136* | |
H99B | 0.3519 | 0.3636 | 0.6572 | 0.136* | |
H99C | 0.3813 | 0.3511 | 0.5526 | 0.136* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0842 (6) | 0.0557 (5) | 0.0649 (5) | −0.0032 (5) | −0.0152 (5) | 0.0061 (5) |
O1 | 0.0462 (11) | 0.0691 (15) | 0.0693 (14) | −0.0068 (10) | 0.0032 (12) | −0.0023 (13) |
O4 | 0.0470 (12) | 0.0637 (14) | 0.0632 (14) | 0.0053 (11) | −0.0018 (11) | 0.0033 (11) |
O5 | 0.0686 (15) | 0.0762 (17) | 0.0535 (14) | −0.0004 (14) | −0.0026 (13) | −0.0064 (12) |
O2 | 0.0706 (15) | 0.0653 (14) | 0.0533 (13) | 0.0008 (12) | 0.0002 (12) | 0.0075 (12) |
O3 | 0.0718 (15) | 0.0691 (15) | 0.0569 (15) | 0.0070 (13) | 0.0017 (13) | 0.0003 (13) |
O6 | 0.0656 (15) | 0.0867 (19) | 0.0535 (14) | −0.0118 (14) | 0.0089 (13) | −0.0105 (13) |
C6 | 0.0490 (19) | 0.068 (2) | 0.083 (3) | 0.0046 (17) | −0.005 (2) | 0.007 (2) |
C12 | 0.0472 (18) | 0.073 (2) | 0.087 (3) | −0.0077 (17) | −0.015 (2) | 0.000 (2) |
C5 | 0.059 (2) | 0.061 (2) | 0.076 (2) | 0.0041 (18) | −0.011 (2) | 0.0118 (19) |
C7 | 0.0488 (19) | 0.089 (3) | 0.081 (3) | −0.0001 (19) | 0.019 (2) | −0.014 (2) |
C11 | 0.061 (2) | 0.072 (2) | 0.071 (2) | −0.0045 (19) | −0.013 (2) | −0.0100 (19) |
C3 | 0.092 (3) | 0.087 (3) | 0.0432 (19) | 0.016 (2) | −0.003 (2) | −0.0128 (18) |
C2 | 0.089 (3) | 0.079 (3) | 0.054 (2) | 0.012 (2) | 0.018 (2) | 0.008 (2) |
C4 | 0.087 (2) | 0.090 (3) | 0.046 (2) | −0.002 (2) | −0.005 (2) | 0.001 (2) |
C10 | 0.083 (2) | 0.095 (3) | 0.049 (2) | −0.008 (2) | −0.008 (2) | −0.008 (2) |
C9 | 0.105 (3) | 0.095 (3) | 0.047 (2) | −0.015 (3) | 0.004 (2) | 0.0011 (19) |
C1 | 0.058 (2) | 0.073 (3) | 0.078 (3) | 0.0017 (19) | 0.017 (2) | 0.006 (2) |
C8 | 0.081 (3) | 0.093 (3) | 0.071 (3) | −0.011 (3) | 0.016 (2) | −0.026 (2) |
O7 | 0.232 (15) | 0.149 (12) | 0.209 (14) | −0.154 (12) | 0.056 (12) | −0.047 (10) |
O8 | 0.219 (14) | 0.133 (7) | 0.067 (4) | −0.045 (10) | −0.007 (6) | 0.056 (4) |
O9 | 0.089 (5) | 0.204 (11) | 0.161 (9) | −0.010 (6) | −0.055 (6) | −0.045 (9) |
O10 | 0.192 (9) | 0.221 (12) | 0.103 (6) | 0.045 (9) | 0.057 (6) | −0.033 (7) |
O7' | 0.269 (19) | 0.070 (7) | 0.220 (14) | 0.042 (9) | 0.012 (14) | 0.085 (8) |
O8' | 0.36 (2) | 0.156 (11) | 0.31 (2) | −0.123 (13) | 0.08 (2) | −0.159 (14) |
O9' | 0.295 (19) | 0.40 (3) | 0.248 (19) | 0.26 (2) | −0.030 (16) | 0.118 (17) |
O10' | 0.127 (7) | 0.174 (9) | 0.251 (13) | 0.008 (7) | 0.059 (8) | −0.045 (9) |
N1 | 0.121 (3) | 0.0387 (14) | 0.0533 (16) | 0.0026 (17) | 0.009 (2) | 0.0043 (12) |
O20 | 0.0592 (15) | 0.0859 (19) | 0.153 (3) | 0.0080 (15) | 0.0083 (19) | 0.0404 (18) |
C98 | 0.103 (3) | 0.065 (2) | 0.115 (4) | −0.013 (2) | −0.009 (3) | −0.008 (3) |
C99 | 0.092 (3) | 0.070 (2) | 0.110 (4) | 0.007 (2) | 0.002 (3) | 0.013 (3) |
Cl1—O8' | 1.239 (9) | C11—H11A | 0.9700 |
Cl1—O9' | 1.246 (13) | C11—H11B | 0.9700 |
Cl1—O7' | 1.285 (9) | C3—C4 | 1.481 (5) |
Cl1—O7 | 1.324 (9) | C3—H3A | 0.9700 |
Cl1—O8 | 1.356 (8) | C3—H3B | 0.9700 |
Cl1—O9 | 1.365 (7) | C2—C1 | 1.498 (5) |
Cl1—O10 | 1.480 (8) | C2—H2A | 0.9700 |
Cl1—O10' | 1.523 (10) | C2—H2B | 0.9700 |
O1—C6 | 1.409 (4) | C4—H4A | 0.9700 |
O1—C7 | 1.418 (4) | C4—H4B | 0.9700 |
O4—C12 | 1.420 (4) | C10—C9 | 1.474 (6) |
O4—C1 | 1.425 (4) | C10—H10A | 0.9700 |
O5—C11 | 1.405 (4) | C10—H10B | 0.9700 |
O5—C10 | 1.427 (4) | C9—H9A | 0.9700 |
O2—C5 | 1.422 (4) | C9—H9B | 0.9700 |
O2—C4 | 1.422 (4) | C1—H1A | 0.9700 |
O3—C2 | 1.418 (5) | C1—H1B | 0.9700 |
O3—C3 | 1.437 (4) | C8—H8A | 0.9700 |
O6—C8 | 1.415 (5) | C8—H8B | 0.9700 |
O6—C9 | 1.435 (4) | N1—C99 | 1.460 (5) |
C6—C5 | 1.479 (5) | N1—C98 | 1.469 (5) |
C6—H6A | 0.9700 | N1—H1AA | 1.0493 |
C6—H6B | 0.9700 | N1—H1BB | 0.8642 |
C12—C11 | 1.485 (5) | O20—H20A | 0.7616 |
C12—H12A | 0.9700 | O20—H20B | 0.9001 |
C12—H12B | 0.9700 | C98—H98A | 0.9600 |
C5—H5A | 0.9700 | C98—H98B | 0.9600 |
C5—H5B | 0.9700 | C98—H98C | 0.9600 |
C7—C8 | 1.502 (5) | C99—H99A | 0.9600 |
C7—H7A | 0.9700 | C99—H99B | 0.9600 |
C7—H7B | 0.9700 | C99—H99C | 0.9600 |
O7—Cl1—O8 | 110.8 (9) | O3—C2—H2A | 109.8 |
O7—Cl1—O9 | 119.6 (10) | C1—C2—H2A | 109.8 |
O8—Cl1—O9 | 118.7 (8) | O3—C2—H2B | 109.8 |
O7—Cl1—O10 | 87.5 (10) | C1—C2—H2B | 109.8 |
O8—Cl1—O10 | 114.5 (8) | H2A—C2—H2B | 108.2 |
O9—Cl1—O10 | 100.7 (7) | O2—C4—C3 | 108.0 (3) |
O8'—Cl1—O9' | 99.9 (16) | O2—C4—H4A | 110.1 |
O8'—Cl1—O7' | 136.6 (14) | C3—C4—H4A | 110.1 |
O9'—Cl1—O7' | 116.8 (15) | O2—C4—H4B | 110.1 |
O8'—Cl1—O10' | 109.0 (10) | C3—C4—H4B | 110.1 |
O9'—Cl1—O10' | 104.7 (9) | H4A—C4—H4B | 108.4 |
O7'—Cl1—O10' | 84.3 (10) | O5—C10—C9 | 108.2 (3) |
C6—O1—C7 | 112.1 (2) | O5—C10—H10A | 110.1 |
C12—O4—C1 | 111.5 (2) | C9—C10—H10A | 110.1 |
C11—O5—C10 | 111.0 (3) | O5—C10—H10B | 110.1 |
C5—O2—C4 | 110.3 (3) | C9—C10—H10B | 110.1 |
C2—O3—C3 | 113.9 (3) | H10A—C10—H10B | 108.4 |
C8—O6—C9 | 114.4 (3) | O6—C9—C10 | 113.1 (3) |
O1—C6—C5 | 109.8 (3) | O6—C9—H9A | 109.0 |
O1—C6—H6A | 109.7 | C10—C9—H9A | 109.0 |
C5—C6—H6A | 109.7 | O6—C9—H9B | 109.0 |
O1—C6—H6B | 109.7 | C10—C9—H9B | 109.0 |
C5—C6—H6B | 109.7 | H9A—C9—H9B | 107.8 |
H6A—C6—H6B | 108.2 | O4—C1—C2 | 108.9 (3) |
O4—C12—C11 | 109.1 (3) | O4—C1—H1A | 109.9 |
O4—C12—H12A | 109.9 | C2—C1—H1A | 109.9 |
C11—C12—H12A | 109.9 | O4—C1—H1B | 109.9 |
O4—C12—H12B | 109.9 | C2—C1—H1B | 109.9 |
C11—C12—H12B | 109.9 | H1A—C1—H1B | 108.3 |
H12A—C12—H12B | 108.3 | O6—C8—C7 | 109.5 (3) |
O2—C5—C6 | 109.6 (3) | O6—C8—H8A | 109.8 |
O2—C5—H5A | 109.8 | C7—C8—H8A | 109.8 |
C6—C5—H5A | 109.8 | O6—C8—H8B | 109.8 |
O2—C5—H5B | 109.8 | C7—C8—H8B | 109.8 |
C6—C5—H5B | 109.8 | H8A—C8—H8B | 108.2 |
H5A—C5—H5B | 108.2 | C99—N1—C98 | 112.8 (3) |
O1—C7—C8 | 109.5 (3) | C99—N1—H1AA | 104.3 |
O1—C7—H7A | 109.8 | C98—N1—H1AA | 113.5 |
C8—C7—H7A | 109.8 | C99—N1—H1BB | 119.3 |
O1—C7—H7B | 109.8 | C98—N1—H1BB | 97.0 |
C8—C7—H7B | 109.8 | H1AA—N1—H1BB | 110.2 |
H7A—C7—H7B | 108.2 | H20A—O20—H20B | 118.8 |
O5—C11—C12 | 109.8 (3) | N1—C98—H98A | 109.5 |
O5—C11—H11A | 109.7 | N1—C98—H98B | 109.5 |
C12—C11—H11A | 109.7 | H98A—C98—H98B | 109.5 |
O5—C11—H11B | 109.7 | N1—C98—H98C | 109.5 |
C12—C11—H11B | 109.7 | H98A—C98—H98C | 109.5 |
H11A—C11—H11B | 108.2 | H98B—C98—H98C | 109.5 |
O3—C3—C4 | 112.8 (3) | N1—C99—H99A | 109.5 |
O3—C3—H3A | 109.0 | N1—C99—H99B | 109.5 |
C4—C3—H3A | 109.0 | H99A—C99—H99B | 109.5 |
O3—C3—H3B | 109.0 | N1—C99—H99C | 109.5 |
C4—C3—H3B | 109.0 | H99A—C99—H99C | 109.5 |
H3A—C3—H3B | 107.8 | H99B—C99—H99C | 109.5 |
O3—C2—C1 | 109.5 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1AA···O6 | 1.05 | 2.00 | 2.979 (4) | 154 |
N1—H1AA···O5 | 1.05 | 2.62 | 3.285 (4) | 121 |
N1—H1BB···O3 | 0.86 | 2.14 | 2.979 (4) | 164 |
O20—H20B···O4i | 0.90 | 2.12 | 3.013 (4) | 171 |
O20—H20A···O1i | 0.76 | 2.21 | 2.927 (3) | 158 |
Symmetry code: (i) x+1/2, −y+3/2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C2H8N+·ClO4−·C12H24O6·H2O |
Mr | 427.87 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 293 |
a, b, c (Å) | 10.684 (2), 13.954 (3), 14.583 (3) |
V (Å3) | 2174.1 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.4 × 0.3 × 0.2 |
Data collection | |
Diffractometer | Rigaku SCXmini diffractometer |
Absorption correction | Multi-scan CrystalClear (Rigaku, 2005) |
Tmin, Tmax | 0.955, 0.955 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22574, 4973, 2814 |
Rint | 0.070 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.058, 0.171, 1.00 |
No. of reflections | 4973 |
No. of parameters | 283 |
No. of restraints | 51 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.29, −0.15 |
Absolute structure | Flack (1983), 2168 Friedel pairs |
Absolute structure parameter | 0.02 (10) |
Computer programs: CrystalClear (Rigaku, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008), PRPKAPPA (Ferguson, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1AA···O6 | 1.05 | 2.00 | 2.979 (4) | 153.9 |
N1—H1BB···O3 | 0.86 | 2.14 | 2.979 (4) | 164.1 |
O20—H20B···O4i | 0.90 | 2.12 | 3.013 (4) | 171.4 |
O20—H20A···O1i | 0.76 | 2.21 | 2.927 (3) | 157.7 |
Symmetry code: (i) x+1/2, −y+3/2, −z+1. |
Acknowledgements
The authors thank the start-up projects for the Postdoctoral Research Funds of Southeast University (grant No. 1112000047) and the starter fund of Southeast University for financial support to buy the X-ray diffractometer.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The crown ethers are of a great interest since their discovery by Pedersen (1967). The ability of these macrocycles to form non-covalent, H-bonding complexes with ammonium cations has been actively investigated. Both the size of the crown ether and the nature of the ammonium cation (NH4+, RNH3+, etc) can influence on the stoichiometry and stability of these host-guest complexes. The host molecules combine with the guest species by intermolecular interactions, and if the host molecule has some specific sites, it is easy to realize high selectivity in ion or molecular recognition. 18-crown-6 has the highest affinity for ammonium cations RNH3+, and most studies of 18-crown-6 and its derivatives invariably showed the 1:1 stoichiometry with RNH3+ cations.
The title compound dielectric permittivity was tested to systematically investigate the ferroelectric phase transitions of these materials (Fu et al., 2007; Ye et al., 2009; Zhang et al., 2009). The title compound has no dielectric anomalies, with the relative permittivity at 1 MHz being in the range 4–5 between 80 and 330 K (m.p. is 353 K), suggesting that no phase transition occurred within the measured temperature range.
The title compound is composed of cation [(CH3)2NH2(18-Crown-6)]+, one isolated anion (ClO4)-, and one lattice water molecule (Fig 1). The protonated dimethylamine [(CH3)2NH2]+ and 18-crown-6 form a supramolecular structure through N—H···O hydrogen bonds between the ammonium NH2+ group and four O atoms of the crown ether. The water molecule on the other side of the 18-crown-6 ring forms O—H···O hydrogen bonds between the O—H groups of water and two other O atoms of the crown ether. The intramolecular N—H···O hydrogen bond lengths are within the usual range: 2.979 (4)–3.285 (4) Å, and the intramolecular O—H···O hydrogen bond lengths are from 2.927 (3) to 3.013 (4) Å. The crown ring shows severe distortions. The six O atoms of the crown ether take the approximate "boat-shape" conformation. The four O atoms bonding to the NH2+ cation lie on the bottom of the boat, while the other two O atoms bonded to the water molecule lie on the head and tail of the boat.
The (ClO4)- anion is disordered, as detectable from the large displacement parameters for O atoms and short Cl—O bond lengths. The disorder was modelled with two sites with equal occupancies for O atoms, and the geometry of the anion was regularized through soft restraints.
Fig. 2 shows a view of the crystal structure down the b axis. The cations [(CH3)2NH2(18-Crown-6)]+ are arranged into layers almost parallel to (101). The anions (ClO4)- are placed in the voids formed by the cations. The title compound is stabilized by intramolecular N—H···O and O—H···O hydrogen bonds, as above described, but no intermolecular hydrogen bonds are observed.