organic compounds
of 2-methylpiperazine-1,4-diium bis(hydrogen maleate)
aLaboratoire de chimie des Matériaux, Faculté des Sciences de Bizerte, Université de Carthage, 7021 Zarzouna Bizerte, Tunisia, and bDepartment of Chemistry and Bioengineering, Tampere University of Technology, PO Box 541, 33101 Tampere, Finland
*Correspondence e-mail: wajda_sta@yahoo.fr
In the title salt, C5H14N22+·2C4H3O4−, the contains two independent 2-methylpiperazinium dications, which comprise a racemic pair, and four hydrogen maleate monoanions. In the roughly planar hydrogen maleate anions, intramolecular O—H⋯O hydrogen bonds generate S(7) rings. In the crystal, the four independent anions are linked to the 2-methylpiperazinium cations through N—H⋯O hydrogen bonds, forming two-dimensional layered structures lying parallel to (001).
CCDC reference: 1049285
1. Related literature
For maleate geometry and its S(7) ring formation, see: Anitha et al. (2012). For background on 2-methylpiperazine salts, see: Hajlaoui et al. (2011); Wilkinson & Harrison (2007). For a similar structure, see: Mathlouthi et al. (2014). For puckering parameters, see: Cremer & Pople (1975).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: CrysAlis PRO (Agilent, 2013); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR2011 (Burla et al., 2012); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008, 2015) within WinGX (Farrugia, 2012); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL2013.
Supporting information
CCDC reference: 1049285
10.1107/S2056989015003102/zs2325sup1.cif
contains datablocks I, General. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989015003102/zs2325Isup2.hkl
Supporting information file. DOI: 10.1107/S2056989015003102/zs2325Isup3.cml
A mixture of maleic acid (1M) and 2-methylpiperazine dissolved in ethanol (molar ratio 1:1:1) was stirred for 2 h and then kept at room temperature. Transparent crystals of the title compound were obtained one week later.
All H atoms bonded to C atoms of organic cations were positioned geometrically and treated as riding on their parent atoms, [C—H = 0.99 Å] with Uiso(H) = 1.2 Ueq(C). H-atoms attached to O and N atoms were located in difference Fourier maps and the positional paramaters for those attached to O were refined, with Uiso(H) = 1.5 Ueq(O) while the N—H bond distances were allowed to ride with N—H restrained at 0.91 (2) Å and Uiso(H) = 1.2 Ueq(N).
Data collection: CrysAlis PRO (Agilent, 2013); cell
CrysAlis PRO (Agilent, 2013); data reduction: CrysAlis PRO (Agilent, 2013); program(s) used to solve structure: SIR2011 (Burla et al., 2012); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008, 2015) within WinGX (Farrugia, 2012); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL2013 (Sheldrick, 2015).Fig. 1. The two dications and the four anions in the asymmetric unit of the title salt, with atom numbering scheme. Displacement ellipsoids for non-H atoms are drawn at the 30% probability level. | |
Fig. 2. A view of a layerered structure of the title compound along the c axis showing the two-dimensional layers lying parallel to the (001) plane. Hydrogen bonds are denoted by dashed lines. | |
Fig. 3. The structure of the title compound viewed along the b axis. |
C5H14N22+·2C4H3O4− | Z = 4 |
Mr = 332.31 | F(000) = 704 |
Triclinic, P1 | Dx = 1.396 Mg m−3 |
a = 11.4678 (9) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 11.4919 (9) Å | Cell parameters from 3309 reflections |
c = 13.3404 (13) Å | θ = 2.2–28.5° |
α = 71.692 (8)° | µ = 0.12 mm−1 |
β = 75.572 (8)° | T = 170 K |
γ = 74.303 (7)° | Prism, colourless |
V = 1580.7 (2) Å3 | 0.33 × 0.14 × 0.07 mm |
Agilent SuperNova (single source at offset, Eos) diffractometer | 6990 independent reflections |
Mirror monochromator | 5127 reflections with I > 2σ(I) |
Detector resolution: 16.0107 pixels mm-1 | Rint = 0.020 |
ω scans | θmax = 29.0°, θmin = 1.9° |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013) | h = −14→14 |
Tmin = 0.970, Tmax = 0.990 | k = −15→11 |
10102 measured reflections | l = −17→18 |
Refinement on F2 | 8 restraints |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.049 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.133 | w = 1/[σ2(Fo2) + (0.0497P)2 + 0.2961P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max < 0.001 |
6990 reflections | Δρmax = 0.27 e Å−3 |
451 parameters | Δρmin = −0.23 e Å−3 |
C5H14N22+·2C4H3O4− | γ = 74.303 (7)° |
Mr = 332.31 | V = 1580.7 (2) Å3 |
Triclinic, P1 | Z = 4 |
a = 11.4678 (9) Å | Mo Kα radiation |
b = 11.4919 (9) Å | µ = 0.12 mm−1 |
c = 13.3404 (13) Å | T = 170 K |
α = 71.692 (8)° | 0.33 × 0.14 × 0.07 mm |
β = 75.572 (8)° |
Agilent SuperNova (single source at offset, Eos) diffractometer | 6990 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013) | 5127 reflections with I > 2σ(I) |
Tmin = 0.970, Tmax = 0.990 | Rint = 0.020 |
10102 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 8 restraints |
wR(F2) = 0.133 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.27 e Å−3 |
6990 reflections | Δρmin = −0.23 e Å−3 |
451 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
N1 | 0.47112 (14) | −0.07313 (15) | 0.24023 (13) | 0.0264 (3) | |
H1C | 0.4636 (18) | −0.1306 (16) | 0.2079 (15) | 0.032* | |
H1D | 0.5432 (16) | −0.0963 (18) | 0.2683 (15) | 0.032* | |
N2 | 0.24684 (15) | 0.10974 (15) | 0.21164 (13) | 0.0289 (4) | |
H2E | 0.2571 (19) | 0.1670 (17) | 0.2438 (15) | 0.035* | |
H2F | 0.1734 (16) | 0.1357 (18) | 0.1822 (15) | 0.035* | |
C1 | 0.36652 (17) | −0.06564 (18) | 0.33304 (15) | 0.0285 (4) | |
H1 | 0.3764 | −0.0068 | 0.3704 | 0.034* | |
C2 | 0.24641 (17) | −0.01499 (18) | 0.29123 (16) | 0.0303 (4) | |
H2A | 0.2339 | −0.0745 | 0.2569 | 0.036* | |
H2B | 0.1773 | −0.0068 | 0.3519 | 0.036* | |
C3 | 0.35045 (17) | 0.10233 (19) | 0.11976 (16) | 0.0317 (4) | |
H3A | 0.3505 | 0.1868 | 0.0698 | 0.038* | |
H3B | 0.3398 | 0.0471 | 0.0803 | 0.038* | |
C4 | 0.47168 (17) | 0.05140 (18) | 0.15914 (16) | 0.0306 (4) | |
H4A | 0.5394 | 0.0420 | 0.0977 | 0.037* | |
H4B | 0.4863 | 0.1112 | 0.1919 | 0.037* | |
C5 | 0.3686 (2) | −0.19420 (19) | 0.41174 (17) | 0.0389 (5) | |
H5A | 0.4474 | −0.2245 | 0.4372 | 0.058* | |
H5B | 0.3588 | −0.2526 | 0.3759 | 0.058* | |
H5C | 0.3011 | −0.1885 | 0.4729 | 0.058* | |
N1A | 0.94928 (15) | 0.40524 (14) | 0.23662 (13) | 0.0261 (3) | |
H1E | 0.9556 (18) | 0.3171 (14) | 0.2709 (15) | 0.031* | |
H1F | 1.0225 (15) | 0.4310 (18) | 0.2052 (15) | 0.031* | |
N2A | 0.78144 (15) | 0.64376 (15) | 0.20796 (14) | 0.0290 (4) | |
H2G | 0.7075 (15) | 0.6198 (19) | 0.2407 (16) | 0.035* | |
H2H | 0.7684 (19) | 0.7327 (14) | 0.1807 (15) | 0.035* | |
C1A | 0.89052 (18) | 0.46035 (17) | 0.32972 (15) | 0.0294 (4) | |
H1A | 0.8112 | 0.4321 | 0.3635 | 0.035* | |
C2A | 0.86258 (18) | 0.60249 (17) | 0.28913 (16) | 0.0306 (4) | |
H2C | 0.8216 | 0.6396 | 0.3500 | 0.037* | |
H2D | 0.9404 | 0.6322 | 0.2567 | 0.037* | |
C3A | 0.83774 (19) | 0.58864 (17) | 0.11580 (15) | 0.0319 (4) | |
H3C | 0.9137 | 0.6198 | 0.0775 | 0.038* | |
H3D | 0.7798 | 0.6150 | 0.0650 | 0.038* | |
C4A | 0.86848 (18) | 0.44718 (17) | 0.15408 (15) | 0.0289 (4) | |
H4C | 0.7916 | 0.4155 | 0.1853 | 0.035* | |
H4D | 0.9110 | 0.4120 | 0.0924 | 0.035* | |
C5A | 0.9731 (2) | 0.4155 (2) | 0.41267 (18) | 0.0428 (5) | |
H5D | 0.9892 | 0.3237 | 0.4373 | 0.064* | |
H5E | 0.9325 | 0.4506 | 0.4738 | 0.064* | |
H5F | 1.0511 | 0.4429 | 0.3807 | 0.064* | |
O1 | 0.66248 (13) | −0.15326 (13) | 0.35791 (11) | 0.0348 (3) | |
O2 | 0.66093 (13) | 0.04943 (13) | 0.30938 (12) | 0.0395 (4) | |
H2 | 0.720 (2) | 0.116 (2) | 0.3089 (19) | 0.059* | |
O3 | 0.79597 (13) | 0.18044 (12) | 0.30752 (11) | 0.0354 (3) | |
O4 | 0.97246 (13) | 0.15407 (12) | 0.35879 (11) | 0.0326 (3) | |
C6 | 0.70396 (18) | −0.06453 (18) | 0.35806 (15) | 0.0296 (4) | |
C7 | 0.80662 (18) | −0.09258 (18) | 0.41811 (15) | 0.0319 (4) | |
H7 | 0.8216 | −0.1751 | 0.4640 | 0.038* | |
C8 | 0.88045 (18) | −0.02073 (18) | 0.41771 (15) | 0.0306 (4) | |
H8 | 0.9404 | −0.0603 | 0.4626 | 0.037* | |
C9 | 0.88357 (18) | 0.11290 (17) | 0.35741 (15) | 0.0276 (4) | |
O1A | 0.26932 (14) | 0.25263 (14) | 0.33171 (12) | 0.0416 (4) | |
O2A | 0.42635 (13) | 0.33042 (13) | 0.22241 (11) | 0.0342 (3) | |
H2I | 0.493 (2) | 0.398 (2) | 0.2194 (18) | 0.051* | |
O3A | 0.55889 (13) | 0.46177 (13) | 0.22439 (11) | 0.0342 (3) | |
O4A | 0.58356 (13) | 0.55559 (14) | 0.33715 (12) | 0.0396 (4) | |
C6A | 0.35063 (19) | 0.31324 (18) | 0.31199 (16) | 0.0311 (4) | |
C7A | 0.3585 (2) | 0.36602 (19) | 0.39852 (16) | 0.0355 (5) | |
H7A | 0.3016 | 0.3453 | 0.4632 | 0.043* | |
C8A | 0.43201 (19) | 0.43722 (19) | 0.40013 (16) | 0.0334 (5) | |
H8A | 0.4193 | 0.4589 | 0.4657 | 0.040* | |
C9A | 0.53077 (18) | 0.48811 (18) | 0.31542 (16) | 0.0300 (4) | |
O1B | 0.73978 (12) | −0.10379 (12) | 0.10276 (11) | 0.0303 (3) | |
O2B | 0.91092 (12) | −0.12659 (12) | 0.16097 (11) | 0.0346 (3) | |
H2J | 0.980 (2) | −0.060 (2) | 0.1591 (18) | 0.052* | |
O3B | 1.04304 (13) | 0.00525 (12) | 0.16145 (11) | 0.0340 (3) | |
O4B | 1.05050 (12) | 0.20575 (12) | 0.10410 (11) | 0.0294 (3) | |
C6B | 0.82359 (17) | −0.05937 (17) | 0.11055 (15) | 0.0258 (4) | |
C7B | 0.81991 (18) | 0.07654 (17) | 0.05890 (16) | 0.0307 (4) | |
H7B | 0.7552 | 0.1182 | 0.0193 | 0.037* | |
C8B | 0.89284 (18) | 0.14906 (17) | 0.05930 (16) | 0.0307 (4) | |
H8B | 0.8715 | 0.2341 | 0.0201 | 0.037* | |
C9B | 1.00213 (16) | 0.11871 (17) | 0.11108 (14) | 0.0243 (4) | |
O1C | 0.16316 (13) | 0.47339 (14) | 0.10385 (12) | 0.0409 (4) | |
O2C | 0.18351 (13) | 0.57671 (13) | 0.21065 (11) | 0.0367 (3) | |
H2K | 0.250 (2) | 0.640 (2) | 0.2150 (18) | 0.055* | |
O3C | 0.31604 (13) | 0.70898 (14) | 0.20988 (11) | 0.0373 (3) | |
O4C | 0.47555 (14) | 0.78285 (14) | 0.10389 (12) | 0.0417 (4) | |
C6C | 0.21839 (17) | 0.53961 (18) | 0.12438 (15) | 0.0295 (4) | |
C7C | 0.32705 (17) | 0.57784 (17) | 0.04445 (15) | 0.0282 (4) | |
H7C | 0.3474 | 0.5450 | −0.0162 | 0.034* | |
C8C | 0.40062 (17) | 0.65074 (17) | 0.04398 (15) | 0.0279 (4) | |
H8C | 0.4646 | 0.6614 | −0.0169 | 0.033* | |
C9C | 0.39798 (18) | 0.71797 (18) | 0.12411 (16) | 0.0299 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
N1 | 0.0202 (8) | 0.0294 (8) | 0.0316 (9) | −0.0010 (7) | −0.0068 (7) | −0.0129 (7) |
N2 | 0.0219 (8) | 0.0305 (9) | 0.0368 (9) | −0.0005 (7) | −0.0096 (7) | −0.0133 (7) |
C1 | 0.0240 (10) | 0.0335 (10) | 0.0285 (10) | −0.0021 (8) | −0.0043 (8) | −0.0126 (8) |
C2 | 0.0242 (10) | 0.0337 (10) | 0.0330 (11) | −0.0051 (8) | −0.0030 (8) | −0.0115 (9) |
C3 | 0.0263 (10) | 0.0364 (11) | 0.0326 (11) | −0.0048 (8) | −0.0070 (8) | −0.0096 (9) |
C4 | 0.0251 (10) | 0.0321 (10) | 0.0349 (11) | −0.0045 (8) | −0.0061 (8) | −0.0098 (9) |
C5 | 0.0362 (12) | 0.0397 (12) | 0.0357 (12) | −0.0023 (9) | −0.0057 (10) | −0.0083 (10) |
N1A | 0.0256 (8) | 0.0214 (8) | 0.0313 (9) | −0.0044 (7) | −0.0039 (7) | −0.0084 (7) |
N2A | 0.0267 (9) | 0.0212 (8) | 0.0373 (10) | −0.0047 (7) | −0.0024 (7) | −0.0082 (7) |
C1A | 0.0339 (11) | 0.0275 (10) | 0.0278 (10) | −0.0070 (8) | −0.0033 (8) | −0.0099 (8) |
C2A | 0.0314 (10) | 0.0274 (10) | 0.0347 (11) | −0.0053 (8) | −0.0043 (9) | −0.0126 (8) |
C3A | 0.0361 (11) | 0.0268 (10) | 0.0311 (11) | −0.0056 (8) | −0.0049 (9) | −0.0071 (8) |
C4A | 0.0304 (10) | 0.0263 (10) | 0.0322 (10) | −0.0046 (8) | −0.0079 (8) | −0.0102 (8) |
C5A | 0.0502 (14) | 0.0408 (12) | 0.0428 (13) | −0.0060 (10) | −0.0181 (11) | −0.0137 (10) |
O1 | 0.0325 (8) | 0.0370 (8) | 0.0390 (8) | −0.0134 (6) | −0.0114 (6) | −0.0064 (6) |
O2 | 0.0367 (8) | 0.0336 (8) | 0.0508 (9) | −0.0078 (7) | −0.0212 (7) | −0.0039 (7) |
O3 | 0.0345 (8) | 0.0281 (7) | 0.0428 (8) | −0.0056 (6) | −0.0155 (7) | −0.0026 (6) |
O4 | 0.0360 (8) | 0.0271 (7) | 0.0389 (8) | −0.0095 (6) | −0.0129 (6) | −0.0074 (6) |
C6 | 0.0275 (10) | 0.0338 (11) | 0.0275 (10) | −0.0095 (8) | −0.0040 (8) | −0.0060 (8) |
C7 | 0.0343 (11) | 0.0312 (10) | 0.0310 (11) | −0.0114 (9) | −0.0124 (9) | −0.0003 (8) |
C8 | 0.0323 (11) | 0.0313 (10) | 0.0280 (10) | −0.0071 (8) | −0.0123 (9) | −0.0021 (8) |
C9 | 0.0309 (10) | 0.0287 (10) | 0.0245 (10) | −0.0066 (8) | −0.0058 (8) | −0.0082 (8) |
O1A | 0.0520 (10) | 0.0429 (9) | 0.0386 (8) | −0.0252 (8) | −0.0034 (7) | −0.0133 (7) |
O2A | 0.0387 (8) | 0.0358 (8) | 0.0315 (8) | −0.0115 (6) | −0.0028 (6) | −0.0131 (6) |
O3A | 0.0295 (7) | 0.0452 (8) | 0.0301 (7) | −0.0117 (6) | 0.0009 (6) | −0.0142 (6) |
O4A | 0.0345 (8) | 0.0514 (9) | 0.0414 (8) | −0.0197 (7) | −0.0025 (7) | −0.0184 (7) |
C6A | 0.0373 (11) | 0.0271 (10) | 0.0301 (11) | −0.0092 (9) | −0.0068 (9) | −0.0063 (8) |
C7A | 0.0437 (12) | 0.0416 (12) | 0.0248 (10) | −0.0203 (10) | −0.0005 (9) | −0.0085 (9) |
C8A | 0.0390 (12) | 0.0409 (12) | 0.0253 (10) | −0.0163 (9) | −0.0037 (9) | −0.0104 (9) |
C9A | 0.0263 (10) | 0.0320 (10) | 0.0322 (11) | −0.0040 (8) | −0.0075 (8) | −0.0092 (9) |
O1B | 0.0281 (7) | 0.0263 (7) | 0.0397 (8) | −0.0068 (6) | −0.0095 (6) | −0.0099 (6) |
O2B | 0.0296 (7) | 0.0244 (7) | 0.0501 (9) | −0.0057 (6) | −0.0167 (7) | −0.0026 (6) |
O3B | 0.0320 (8) | 0.0244 (7) | 0.0487 (9) | −0.0039 (6) | −0.0201 (7) | −0.0057 (6) |
O4B | 0.0255 (7) | 0.0275 (7) | 0.0369 (8) | −0.0070 (6) | −0.0064 (6) | −0.0091 (6) |
C6B | 0.0253 (10) | 0.0259 (9) | 0.0266 (10) | −0.0043 (7) | −0.0031 (8) | −0.0094 (8) |
C7B | 0.0295 (10) | 0.0258 (10) | 0.0372 (11) | −0.0042 (8) | −0.0155 (9) | −0.0028 (8) |
C8B | 0.0314 (11) | 0.0222 (9) | 0.0374 (11) | −0.0042 (8) | −0.0151 (9) | −0.0004 (8) |
C9B | 0.0216 (9) | 0.0262 (9) | 0.0255 (9) | −0.0046 (7) | −0.0022 (7) | −0.0091 (8) |
O1C | 0.0358 (8) | 0.0560 (10) | 0.0394 (8) | −0.0223 (7) | −0.0057 (7) | −0.0146 (7) |
O2C | 0.0316 (8) | 0.0453 (9) | 0.0355 (8) | −0.0138 (7) | 0.0037 (6) | −0.0167 (7) |
O3C | 0.0392 (8) | 0.0422 (8) | 0.0353 (8) | −0.0133 (7) | 0.0011 (7) | −0.0189 (7) |
O4C | 0.0528 (10) | 0.0419 (9) | 0.0391 (8) | −0.0253 (8) | −0.0023 (7) | −0.0140 (7) |
C6C | 0.0253 (10) | 0.0316 (10) | 0.0311 (10) | −0.0040 (8) | −0.0086 (8) | −0.0067 (8) |
C7C | 0.0287 (10) | 0.0294 (10) | 0.0258 (10) | −0.0027 (8) | −0.0063 (8) | −0.0079 (8) |
C8C | 0.0273 (10) | 0.0295 (10) | 0.0253 (10) | −0.0046 (8) | −0.0037 (8) | −0.0070 (8) |
C9C | 0.0322 (11) | 0.0266 (10) | 0.0314 (11) | −0.0059 (8) | −0.0075 (9) | −0.0071 (8) |
N1—C4 | 1.499 (2) | O2—C6 | 1.287 (2) |
N1—C1 | 1.500 (2) | O2—H2 | 1.15 (3) |
N1—H1C | 0.926 (14) | O3—C9 | 1.281 (2) |
N1—H1D | 0.932 (15) | O3—H2 | 1.28 (3) |
N2—C3 | 1.485 (2) | O4—C9 | 1.241 (2) |
N2—C2 | 1.492 (2) | C6—C7 | 1.495 (3) |
N2—H2E | 0.936 (15) | C7—C8 | 1.331 (3) |
N2—H2F | 0.953 (15) | C7—H7 | 0.9500 |
C1—C2 | 1.514 (3) | C8—C9 | 1.499 (3) |
C1—C5 | 1.518 (3) | C8—H8 | 0.9500 |
C1—H1 | 1.0000 | O1A—C6A | 1.240 (2) |
C2—H2A | 0.9900 | O2A—C6A | 1.284 (2) |
C2—H2B | 0.9900 | O2A—H2I | 1.21 (2) |
C3—C4 | 1.510 (3) | O3A—C9A | 1.286 (2) |
C3—H3A | 0.9900 | O3A—H2I | 1.22 (2) |
C3—H3B | 0.9900 | O4A—C9A | 1.239 (2) |
C4—H4A | 0.9900 | C6A—C7A | 1.493 (3) |
C4—H4B | 0.9900 | C7A—C8A | 1.332 (3) |
C5—H5A | 0.9800 | C7A—H7A | 0.9500 |
C5—H5B | 0.9800 | C8A—C9A | 1.486 (3) |
C5—H5C | 0.9800 | C8A—H8A | 0.9500 |
N1A—C4A | 1.496 (2) | O1B—C6B | 1.242 (2) |
N1A—C1A | 1.498 (2) | O2B—C6B | 1.282 (2) |
N1A—H1E | 0.962 (14) | O2B—H2J | 1.24 (2) |
N1A—H1F | 0.921 (15) | O3B—C9B | 1.284 (2) |
N2A—C3A | 1.484 (2) | O3B—H2J | 1.18 (2) |
N2A—C2A | 1.485 (2) | O4B—C9B | 1.238 (2) |
N2A—H2G | 0.923 (15) | C6B—C7B | 1.490 (3) |
N2A—H2H | 0.954 (15) | C7B—C8B | 1.333 (2) |
C1A—C5A | 1.512 (3) | C7B—H7B | 0.9500 |
C1A—C2A | 1.520 (3) | C8B—C9B | 1.488 (3) |
C1A—H1A | 1.0000 | C8B—H8B | 0.9500 |
C2A—H2C | 0.9900 | O1C—C6C | 1.238 (2) |
C2A—H2D | 0.9900 | O2C—C6C | 1.286 (2) |
C3A—C4A | 1.512 (3) | O2C—H2K | 1.20 (2) |
C3A—H3C | 0.9900 | O3C—C9C | 1.283 (2) |
C3A—H3D | 0.9900 | O3C—H2K | 1.22 (2) |
C4A—H4C | 0.9900 | O4C—C9C | 1.238 (2) |
C4A—H4D | 0.9900 | C6C—C7C | 1.491 (3) |
C5A—H5D | 0.9800 | C7C—C8C | 1.338 (2) |
C5A—H5E | 0.9800 | C7C—H7C | 0.9500 |
C5A—H5F | 0.9800 | C8C—C9C | 1.493 (3) |
O1—C6 | 1.237 (2) | C8C—H8C | 0.9500 |
C4—N1—C1 | 111.81 (14) | C4A—C3A—H3D | 109.6 |
C4—N1—H1C | 109.4 (12) | H3C—C3A—H3D | 108.1 |
C1—N1—H1C | 108.5 (13) | N1A—C4A—C3A | 110.55 (15) |
C4—N1—H1D | 107.7 (12) | N1A—C4A—H4C | 109.5 |
C1—N1—H1D | 106.4 (12) | C3A—C4A—H4C | 109.5 |
H1C—N1—H1D | 113.1 (17) | N1A—C4A—H4D | 109.5 |
C3—N2—C2 | 111.34 (15) | C3A—C4A—H4D | 109.5 |
C3—N2—H2E | 107.0 (13) | H4C—C4A—H4D | 108.1 |
C2—N2—H2E | 110.0 (12) | C1A—C5A—H5D | 109.5 |
C3—N2—H2F | 106.1 (12) | C1A—C5A—H5E | 109.5 |
C2—N2—H2F | 108.9 (12) | H5D—C5A—H5E | 109.5 |
H2E—N2—H2F | 113.4 (17) | C1A—C5A—H5F | 109.5 |
N1—C1—C2 | 109.12 (15) | H5D—C5A—H5F | 109.5 |
N1—C1—C5 | 109.79 (15) | H5E—C5A—H5F | 109.5 |
C2—C1—C5 | 111.37 (16) | C6—O2—H2 | 111.4 (12) |
N1—C1—H1 | 108.8 | C9—O3—H2 | 111.6 (11) |
C2—C1—H1 | 108.8 | O1—C6—O2 | 122.17 (17) |
C5—C1—H1 | 108.8 | O1—C6—C7 | 118.00 (17) |
N2—C2—C1 | 110.87 (16) | O2—C6—C7 | 119.83 (17) |
N2—C2—H2A | 109.5 | C8—C7—C6 | 130.47 (18) |
C1—C2—H2A | 109.5 | C8—C7—H7 | 114.8 |
N2—C2—H2B | 109.5 | C6—C7—H7 | 114.8 |
C1—C2—H2B | 109.5 | C7—C8—C9 | 129.97 (18) |
H2A—C2—H2B | 108.1 | C7—C8—H8 | 115.0 |
N2—C3—C4 | 110.34 (15) | C9—C8—H8 | 115.0 |
N2—C3—H3A | 109.6 | O4—C9—O3 | 122.40 (17) |
C4—C3—H3A | 109.6 | O4—C9—C8 | 117.61 (17) |
N2—C3—H3B | 109.6 | O3—C9—C8 | 119.99 (17) |
C4—C3—H3B | 109.6 | C6A—O2A—H2I | 111.0 (11) |
H3A—C3—H3B | 108.1 | C9A—O3A—H2I | 111.4 (11) |
N1—C4—C3 | 110.65 (16) | O1A—C6A—O2A | 122.80 (18) |
N1—C4—H4A | 109.5 | O1A—C6A—C7A | 116.90 (18) |
C3—C4—H4A | 109.5 | O2A—C6A—C7A | 120.29 (18) |
N1—C4—H4B | 109.5 | C8A—C7A—C6A | 130.79 (19) |
C3—C4—H4B | 109.5 | C8A—C7A—H7A | 114.6 |
H4A—C4—H4B | 108.1 | C6A—C7A—H7A | 114.6 |
C1—C5—H5A | 109.5 | C7A—C8A—C9A | 130.13 (18) |
C1—C5—H5B | 109.5 | C7A—C8A—H8A | 114.9 |
H5A—C5—H5B | 109.5 | C9A—C8A—H8A | 114.9 |
C1—C5—H5C | 109.5 | O4A—C9A—O3A | 122.54 (19) |
H5A—C5—H5C | 109.5 | O4A—C9A—C8A | 116.96 (17) |
H5B—C5—H5C | 109.5 | O3A—C9A—C8A | 120.50 (17) |
C4A—N1A—C1A | 111.40 (14) | C6B—O2B—H2J | 109.4 (11) |
C4A—N1A—H1E | 110.4 (12) | C9B—O3B—H2J | 109.6 (11) |
C1A—N1A—H1E | 101.4 (12) | O1B—C6B—O2B | 122.06 (17) |
C4A—N1A—H1F | 108.5 (12) | O1B—C6B—C7B | 117.68 (16) |
C1A—N1A—H1F | 108.9 (12) | O2B—C6B—C7B | 120.26 (16) |
H1E—N1A—H1F | 116.1 (18) | C8B—C7B—C6B | 130.34 (17) |
C3A—N2A—C2A | 111.72 (15) | C8B—C7B—H7B | 114.8 |
C3A—N2A—H2G | 109.8 (13) | C6B—C7B—H7B | 114.8 |
C2A—N2A—H2G | 108.4 (13) | C7B—C8B—C9B | 130.62 (17) |
C3A—N2A—H2H | 107.6 (12) | C7B—C8B—H8B | 114.7 |
C2A—N2A—H2H | 109.1 (12) | C9B—C8B—H8B | 114.7 |
H2G—N2A—H2H | 110.3 (18) | O4B—C9B—O3B | 122.09 (16) |
N1A—C1A—C5A | 110.46 (16) | O4B—C9B—C8B | 117.92 (16) |
N1A—C1A—C2A | 109.13 (15) | O3B—C9B—C8B | 119.99 (16) |
C5A—C1A—C2A | 111.50 (16) | C6C—O2C—H2K | 111.3 (11) |
N1A—C1A—H1A | 108.6 | C9C—O3C—H2K | 111.7 (11) |
C5A—C1A—H1A | 108.6 | O1C—C6C—O2C | 121.98 (18) |
C2A—C1A—H1A | 108.6 | O1C—C6C—C7C | 117.87 (17) |
N2A—C2A—C1A | 110.29 (15) | O2C—C6C—C7C | 120.14 (17) |
N2A—C2A—H2C | 109.6 | C8C—C7C—C6C | 130.72 (18) |
C1A—C2A—H2C | 109.6 | C8C—C7C—H7C | 114.6 |
N2A—C2A—H2D | 109.6 | C6C—C7C—H7C | 114.6 |
C1A—C2A—H2D | 109.6 | C7C—C8C—C9C | 130.18 (18) |
H2C—C2A—H2D | 108.1 | C7C—C8C—H8C | 114.9 |
N2A—C3A—C4A | 110.50 (15) | C9C—C8C—H8C | 114.9 |
N2A—C3A—H3C | 109.6 | O4C—C9C—O3C | 122.04 (18) |
C4A—C3A—H3C | 109.6 | O4C—C9C—C8C | 117.88 (18) |
N2A—C3A—H3D | 109.6 | O3C—C9C—C8C | 120.08 (17) |
C4—N1—C1—C2 | 56.7 (2) | C6—C7—C8—C9 | 0.8 (4) |
C4—N1—C1—C5 | 179.01 (15) | C7—C8—C9—O4 | −170.0 (2) |
C3—N2—C2—C1 | 58.3 (2) | C7—C8—C9—O3 | 10.4 (3) |
N1—C1—C2—N2 | −57.02 (19) | O1A—C6A—C7A—C8A | −177.6 (2) |
C5—C1—C2—N2 | −178.38 (15) | O2A—C6A—C7A—C8A | 2.9 (3) |
C2—N2—C3—C4 | −57.0 (2) | C6A—C7A—C8A—C9A | 0.2 (4) |
C1—N1—C4—C3 | −56.6 (2) | C7A—C8A—C9A—O4A | 178.0 (2) |
N2—C3—C4—N1 | 55.7 (2) | C7A—C8A—C9A—O3A | −2.2 (3) |
C4A—N1A—C1A—C5A | 179.32 (16) | O1B—C6B—C7B—C8B | 176.1 (2) |
C4A—N1A—C1A—C2A | −57.8 (2) | O2B—C6B—C7B—C8B | −3.9 (3) |
C3A—N2A—C2A—C1A | −58.2 (2) | C6B—C7B—C8B—C9B | 0.1 (4) |
N1A—C1A—C2A—N2A | 57.7 (2) | C7B—C8B—C9B—O4B | −176.0 (2) |
C5A—C1A—C2A—N2A | −179.99 (16) | C7B—C8B—C9B—O3B | 3.6 (3) |
C2A—N2A—C3A—C4A | 56.7 (2) | O1C—C6C—C7C—C8C | 177.83 (19) |
C1A—N1A—C4A—C3A | 57.0 (2) | O2C—C6C—C7C—C8C | −1.2 (3) |
N2A—C3A—C4A—N1A | −55.4 (2) | C6C—C7C—C8C—C9C | 0.1 (3) |
O1—C6—C7—C8 | 167.9 (2) | C7C—C8C—C9C—O4C | −178.34 (19) |
O2—C6—C7—C8 | −12.7 (3) | C7C—C8C—C9C—O3C | 0.7 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1C···O4Ci | 0.93 (1) | 1.91 (2) | 2.802 (2) | 162 (2) |
N1—H1D···O1 | 0.93 (2) | 1.89 (2) | 2.801 (2) | 166 (2) |
N2—H2E···O1A | 0.94 (2) | 1.80 (2) | 2.723 (2) | 168 (2) |
N2—H2F···O3Bii | 0.95 (2) | 2.50 (2) | 3.187 (2) | 129 (2) |
N2—H2F···O4Bii | 0.95 (2) | 1.82 (2) | 2.760 (2) | 169 (2) |
N1A—H1E···O3 | 0.96 (1) | 2.59 (2) | 3.279 (2) | 129 (2) |
N1A—H1E···O4 | 0.96 (1) | 1.86 (2) | 2.811 (2) | 169 (2) |
N1A—H1F···O1Ciii | 0.92 (2) | 1.90 (2) | 2.787 (2) | 162 (2) |
N2A—H2G···O4A | 0.92 (2) | 1.81 (2) | 2.710 (2) | 164 (2) |
N2A—H2H···O1Biv | 0.95 (2) | 1.82 (2) | 2.764 (2) | 168 (2) |
N2A—H2H···O2Biv | 0.95 (2) | 2.51 (2) | 3.191 (2) | 128 (2) |
O2—H2···O3 | 1.15 (3) | 1.28 (3) | 2.4258 (19) | 174 (2) |
O2A—H2I···O3A | 1.21 (2) | 1.22 (2) | 2.4240 (19) | 175 (2) |
O3B—H2J···O2B | 1.18 (2) | 1.24 (2) | 2.4174 (18) | 177 (2) |
O2C—H2K···O3C | 1.20 (2) | 1.22 (2) | 2.4192 (19) | 174 (2) |
Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (iii) x+1, y, z; (iv) x, y+1, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1C···O4Ci | 0.926 (14) | 1.906 (16) | 2.802 (2) | 162.1 (18) |
N1—H1D···O1 | 0.932 (15) | 1.888 (15) | 2.801 (2) | 165.8 (18) |
N2—H2E···O1A | 0.936 (15) | 1.801 (15) | 2.723 (2) | 167.9 (18) |
N2—H2F···O3Bii | 0.953 (15) | 2.498 (18) | 3.187 (2) | 129.2 (15) |
N2—H2F···O4Bii | 0.953 (15) | 1.820 (15) | 2.760 (2) | 168.5 (18) |
N1A—H1E···O3 | 0.962 (14) | 2.585 (18) | 3.279 (2) | 129.2 (15) |
N1A—H1E···O4 | 0.962 (14) | 1.860 (15) | 2.811 (2) | 169.3 (17) |
N1A—H1F···O1Ciii | 0.921 (15) | 1.896 (16) | 2.787 (2) | 162.3 (18) |
N2A—H2G···O4A | 0.923 (15) | 1.811 (16) | 2.710 (2) | 164.0 (19) |
N2A—H2H···O1Biv | 0.954 (15) | 1.824 (15) | 2.764 (2) | 167.7 (18) |
N2A—H2H···O2Biv | 0.954 (15) | 2.510 (18) | 3.191 (2) | 128.3 (15) |
O2—H2···O3 | 1.15 (3) | 1.28 (3) | 2.4258 (19) | 174 (2) |
O2A—H2I···O3A | 1.21 (2) | 1.22 (2) | 2.4240 (19) | 175 (2) |
O3B—H2J···O2B | 1.18 (2) | 1.24 (2) | 2.4174 (18) | 177 (2) |
O2C—H2K···O3C | 1.20 (2) | 1.22 (2) | 2.4192 (19) | 174 (2) |
Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (iii) x+1, y, z; (iv) x, y+1, z. |
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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.
Our ongoing studies of novel salts of maleic acid with related substances arises from the fact that hydrogen maleate anions in these systems possess short but highly strained hydrogen bonds in salts with racemic amines (Hajlaoui et al., 2011; Wilkinson & Harrison, 2007). We report herein the synthesis and structure of the title hydrogen maleate salt with 2-methylpiperazine, (C5 H14 N2)2+ 2(C4H3O4-).
As shown in Fig. 1, the asymmetric unit of the title salt contains two independent 2-methylpipirazinium dications which form a racemic pair [C1(R) and C1A(S)] and four hydrogen maleate anions. In the planar hydrogen maleate anions, short intramolecular O—H···O hydrogen bonds (Table 1) generate S(7) rings. This is common in many structures of maleic acid as the cis disposition of the alkene places hydrogen-bonding donors and acceptors in close proximity (Mathlouthi et al., 2014).
In the crystal (Fig. 2), the piperazinium groups of the cation are hydrogen-bonded to the carboxylate O atoms of the anion via N—H···O hydrogen bonds, forming a two-dimensional network. The four maleate anions (C6–C9), (C6A–C9A), (C6B–C9B) and (C6C–C9C) are connected to the organic cations, forming two-dimensional layers lying parallel to (001) (Fig. 3).
In the cation, the piperazinium rings adopt distorted chair conformations [puckering parameters Q, θ, and ϕ = 0.574 (2) Å, 1.11 (1)° and 73.6 (1)° for the first cation and = 0.577 (2) Å, 1.83 (2)° and 73.83 (1) for the second] (Cremer & Pople, 1975).