In the title salt {systematic name: 1-[(1,3-benzodioxol-5-yl)methyl]piperazin-1-ium 4-chlorobenzoate}, C
12H
17N
2O
2+·C
7H
4ClO
2−, the piperazine ring adopts a slightly disordered chair conformation. The dioxole ring is in a flattened envelope conformation with the methylene C atom forming the flap. The relative orientation of the piperonyl ring system and the piperazine rings is reflected in the N—C—C
![[pdbond]](/logos/entities/z-pdbond_rmgif.gif)
C torsion angle of 132.3 (1)°. In the anion, the mean plane of the carboxylate group is twisted from that of the benzene ring by 14.8 (9)°. In the crystal, the components are linked by N—H

O and weak C—H

O hydrogen bonds, forming chains along [010].
Supporting information
CCDC reference: 984052
Key indicators
- Single-crystal X-ray study
- T = 173 K
- Mean
(C-C) = 0.002 Å
- R factor = 0.048
- wR factor = 0.120
- Data-to-parameter ratio = 26.8
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT906_ALERT_3_C Large K value in the Analysis of Variance ...... 3.092 Check
Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details in the CIF Please Do !
PLAT007_ALERT_5_G Number of Unrefined Donor-H Atoms .............. 2 Why ?
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels .......... 8
PLAT910_ALERT_3_G Missing # of FCF Reflections Below Th(Min) ..... 4 Why ?
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L= 0.600 411
0 ALERT level A = Most likely a serious problem - resolve or explain
0 ALERT level B = A potentially serious problem, consider carefully
1 ALERT level C = Check. Ensure it is not caused by an omission or oversight
5 ALERT level G = General information/check it is not something unexpected
0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 ALERT type 2 Indicator that the structure model may be wrong or deficient
2 ALERT type 3 Indicator that the structure quality may be low
2 ALERT type 4 Improvement, methodology, query or suggestion
2 ALERT type 5 Informative message, check
1-piperonylpiperazine ( 2.2 g, 0.01 mol) and p-chlorobenzoic acid (1.56 g,
0.01 mol) were dissolved in hot N,N-dimethylformamide and stirred for
10 mins at 323 K. The resulting solution was allowed to cool slowly at
room temperature. The crystals of the title salt appeared after a few
days and were suitable for X-ray studies (m.p.:464-470 K).
All H atoms were placed in calculated positions and
then refined using the riding-model approximation with Atom—H lengths
of 0.93Å (CH), 0.97Å (CH2) or 0.90Å (NH). Isotropic displacement
parameters were set to 1.2Ueq of the parent atom.
Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO (Agilent, 2012); data reduction: CrysAlis RED (Agilent, 2012); program(s) used to solve structure: SUPERFLIP (Palatinus & Chapuis, 2007); program(s) used to refine structure: SHELXL2012 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) in OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).
1-[(1,3-Benzodioxol-5-yl)methyl]piperazin-1-ium 4-chlorobenzoate
top
Crystal data top
C12H17N2O2+·C7H4ClO2− | F(000) = 792 |
Mr = 376.83 | Dx = 1.380 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 16.9967 (6) Å | Cell parameters from 5056 reflections |
b = 8.5990 (3) Å | θ = 3.1–32.8° |
c = 12.4150 (5) Å | µ = 0.24 mm−1 |
β = 90.923 (3)° | T = 173 K |
V = 1814.27 (12) Å3 | Irregular, light yellow |
Z = 4 | 0.48 × 0.26 × 0.18 mm |
Data collection top
Agilent Gemini EOS diffractometer | 6302 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 4472 reflections with I > 2σ(I) |
Detector resolution: 16.0416 pixels mm-1 | Rint = 0.033 |
ω scans | θmax = 32.8°, θmin = 3.1° |
Absorption correction: multi-scan (CrysAlis PRO and CrysAlis RED; Agilent, 2012) | h = −21→25 |
Tmin = 0.787, Tmax = 1.000 | k = −12→12 |
22917 measured reflections | l = −17→18 |
Refinement top
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: mixed |
R[F2 > 2σ(F2)] = 0.048 | H-atom parameters constrained |
wR(F2) = 0.120 | w = 1/[σ2(Fo2) + (0.0455P)2 + 0.5274P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max = 0.001 |
6302 reflections | Δρmax = 0.30 e Å−3 |
235 parameters | Δρmin = −0.32 e Å−3 |
0 restraints | |
Crystal data top
C12H17N2O2+·C7H4ClO2− | V = 1814.27 (12) Å3 |
Mr = 376.83 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 16.9967 (6) Å | µ = 0.24 mm−1 |
b = 8.5990 (3) Å | T = 173 K |
c = 12.4150 (5) Å | 0.48 × 0.26 × 0.18 mm |
β = 90.923 (3)° | |
Data collection top
Agilent Gemini EOS diffractometer | 6302 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO and CrysAlis RED; Agilent, 2012) | 4472 reflections with I > 2σ(I) |
Tmin = 0.787, Tmax = 1.000 | Rint = 0.033 |
22917 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.048 | 0 restraints |
wR(F2) = 0.120 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.30 e Å−3 |
6302 reflections | Δρmin = −0.32 e Å−3 |
235 parameters | |
Special details top
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes)
are estimated using the full covariance matrix. The cell esds are taken
into account individually in the estimation of esds in distances, angles
and torsion angles; correlations between esds in cell parameters are only
used when they are defined by crystal symmetry. An approximate (isotropic)
treatment of cell esds is used for estimating esds involving l.s. planes. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
O1A | 0.46343 (6) | 0.65641 (14) | 0.06488 (9) | 0.0439 (3) | |
O2A | 0.55838 (7) | 0.84302 (13) | 0.03707 (9) | 0.0452 (3) | |
N1A | 0.79257 (6) | 0.70236 (13) | 0.30762 (9) | 0.0280 (2) | |
N2A | 0.95243 (6) | 0.60800 (13) | 0.27472 (10) | 0.0298 (2) | |
H2AA | 0.9590 | 0.5293 | 0.3218 | 0.036* | |
H2AB | 0.9978 | 0.6209 | 0.2395 | 0.036* | |
C1A | 0.71612 (8) | 0.69075 (19) | 0.35969 (12) | 0.0360 (3) | |
H1AA | 0.7072 | 0.7843 | 0.4014 | 0.043* | |
H1AB | 0.7170 | 0.6033 | 0.4090 | 0.043* | |
C2A | 0.64927 (8) | 0.66996 (16) | 0.27979 (11) | 0.0301 (3) | |
C3A | 0.64318 (8) | 0.77080 (16) | 0.19132 (11) | 0.0321 (3) | |
H3A | 0.6810 | 0.8466 | 0.1789 | 0.039* | |
C4A | 0.57955 (8) | 0.75298 (16) | 0.12438 (11) | 0.0304 (3) | |
C5A | 0.49379 (11) | 0.7623 (2) | −0.01222 (14) | 0.0474 (4) | |
H5AA | 0.4533 | 0.8355 | −0.0346 | 0.057* | |
H5AB | 0.5113 | 0.7063 | −0.0753 | 0.057* | |
C6A | 0.52267 (8) | 0.64112 (17) | 0.14120 (11) | 0.0312 (3) | |
C7A | 0.52767 (9) | 0.54095 (18) | 0.22546 (12) | 0.0373 (3) | |
H7A | 0.4895 | 0.4654 | 0.2367 | 0.045* | |
C8A | 0.59275 (9) | 0.55669 (18) | 0.29434 (12) | 0.0352 (3) | |
H8A | 0.5983 | 0.4885 | 0.3521 | 0.042* | |
C9A | 0.85456 (8) | 0.73757 (16) | 0.38737 (11) | 0.0305 (3) | |
H9AA | 0.8570 | 0.6553 | 0.4408 | 0.037* | |
H9AB | 0.8422 | 0.8340 | 0.4239 | 0.037* | |
C10A | 0.93326 (8) | 0.75244 (15) | 0.33388 (12) | 0.0313 (3) | |
H10A | 0.9320 | 0.8395 | 0.2842 | 0.038* | |
H10B | 0.9738 | 0.7727 | 0.3880 | 0.038* | |
C11A | 0.88861 (8) | 0.56853 (18) | 0.19658 (12) | 0.0349 (3) | |
H11A | 0.9003 | 0.4701 | 0.1621 | 0.042* | |
H11B | 0.8854 | 0.6479 | 0.1412 | 0.042* | |
C12A | 0.81076 (8) | 0.55708 (16) | 0.25287 (12) | 0.0316 (3) | |
H12A | 0.7695 | 0.5336 | 0.2005 | 0.038* | |
H12B | 0.8129 | 0.4730 | 0.3049 | 0.038* | |
Cl1B | 0.33436 (2) | 0.68123 (5) | 0.27279 (3) | 0.04524 (12) | |
O1B | 0.02434 (6) | 0.65334 (11) | 0.59960 (8) | 0.0335 (2) | |
O2B | 0.07906 (6) | 0.87721 (13) | 0.65085 (9) | 0.0411 (3) | |
C1B | 0.14214 (7) | 0.73384 (14) | 0.51518 (10) | 0.0255 (2) | |
C2B | 0.21013 (8) | 0.82354 (16) | 0.52310 (12) | 0.0308 (3) | |
H2B | 0.2152 | 0.8966 | 0.5780 | 0.037* | |
C3B | 0.27034 (8) | 0.80532 (16) | 0.45013 (12) | 0.0339 (3) | |
H3B | 0.3161 | 0.8642 | 0.4562 | 0.041* | |
C4B | 0.26105 (8) | 0.69800 (16) | 0.36822 (11) | 0.0310 (3) | |
C5B | 0.19465 (8) | 0.60586 (16) | 0.35906 (11) | 0.0311 (3) | |
H5B | 0.1897 | 0.5333 | 0.3038 | 0.037* | |
C6B | 0.13543 (8) | 0.62363 (15) | 0.43395 (11) | 0.0284 (3) | |
H6B | 0.0909 | 0.5610 | 0.4296 | 0.034* | |
C7B | 0.07682 (8) | 0.75601 (15) | 0.59450 (11) | 0.0275 (3) | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
O1A | 0.0290 (5) | 0.0598 (7) | 0.0426 (6) | −0.0056 (5) | −0.0065 (4) | 0.0000 (5) |
O2A | 0.0446 (6) | 0.0445 (6) | 0.0461 (6) | −0.0058 (5) | −0.0140 (5) | 0.0112 (5) |
N1A | 0.0247 (5) | 0.0295 (5) | 0.0297 (6) | 0.0009 (4) | −0.0029 (4) | −0.0040 (4) |
N2A | 0.0248 (5) | 0.0248 (5) | 0.0398 (6) | 0.0004 (4) | −0.0013 (4) | 0.0035 (5) |
C1A | 0.0289 (7) | 0.0482 (9) | 0.0310 (7) | 0.0017 (6) | 0.0001 (5) | −0.0022 (6) |
C2A | 0.0243 (6) | 0.0350 (7) | 0.0311 (6) | 0.0031 (5) | 0.0028 (5) | −0.0031 (5) |
C3A | 0.0278 (6) | 0.0295 (7) | 0.0391 (7) | −0.0028 (5) | 0.0005 (5) | −0.0004 (5) |
C4A | 0.0292 (6) | 0.0292 (6) | 0.0328 (7) | 0.0029 (5) | 0.0012 (5) | −0.0007 (5) |
C5A | 0.0497 (10) | 0.0517 (10) | 0.0403 (8) | −0.0057 (8) | −0.0118 (7) | −0.0001 (7) |
C6A | 0.0226 (6) | 0.0374 (7) | 0.0337 (7) | 0.0002 (5) | 0.0022 (5) | −0.0067 (6) |
C7A | 0.0312 (7) | 0.0422 (8) | 0.0387 (8) | −0.0097 (6) | 0.0072 (6) | −0.0005 (6) |
C8A | 0.0341 (7) | 0.0399 (8) | 0.0317 (7) | −0.0015 (6) | 0.0058 (5) | 0.0035 (6) |
C9A | 0.0309 (7) | 0.0293 (6) | 0.0310 (6) | 0.0010 (5) | −0.0055 (5) | −0.0025 (5) |
C10A | 0.0287 (6) | 0.0239 (6) | 0.0411 (7) | −0.0019 (5) | −0.0072 (5) | −0.0013 (5) |
C11A | 0.0304 (7) | 0.0355 (7) | 0.0385 (7) | 0.0033 (5) | −0.0030 (6) | −0.0084 (6) |
C12A | 0.0276 (6) | 0.0276 (6) | 0.0393 (7) | −0.0002 (5) | −0.0049 (5) | −0.0056 (5) |
Cl1B | 0.0359 (2) | 0.0490 (2) | 0.0512 (2) | −0.00034 (16) | 0.01216 (16) | 0.00508 (18) |
O1B | 0.0296 (5) | 0.0288 (5) | 0.0421 (6) | −0.0036 (4) | 0.0024 (4) | 0.0014 (4) |
O2B | 0.0365 (6) | 0.0362 (5) | 0.0509 (6) | −0.0063 (4) | 0.0073 (5) | −0.0127 (5) |
C1B | 0.0249 (6) | 0.0224 (6) | 0.0289 (6) | 0.0012 (4) | −0.0045 (5) | 0.0052 (5) |
C2B | 0.0282 (6) | 0.0271 (6) | 0.0369 (7) | −0.0019 (5) | −0.0059 (5) | −0.0003 (5) |
C3B | 0.0250 (6) | 0.0303 (7) | 0.0463 (8) | −0.0035 (5) | −0.0036 (5) | 0.0042 (6) |
C4B | 0.0248 (6) | 0.0321 (7) | 0.0362 (7) | 0.0033 (5) | 0.0005 (5) | 0.0084 (5) |
C5B | 0.0299 (6) | 0.0313 (7) | 0.0322 (7) | 0.0020 (5) | −0.0043 (5) | −0.0003 (5) |
C6B | 0.0240 (6) | 0.0281 (6) | 0.0330 (7) | −0.0018 (5) | −0.0052 (5) | 0.0030 (5) |
C7B | 0.0261 (6) | 0.0253 (6) | 0.0309 (6) | 0.0024 (5) | −0.0046 (5) | 0.0031 (5) |
Geometric parameters (Å, º) top
O1A—C5A | 1.424 (2) | C9A—H9AA | 0.9700 |
O1A—C6A | 1.3777 (17) | C9A—H9AB | 0.9700 |
O2A—C4A | 1.3753 (17) | C9A—C10A | 1.508 (2) |
O2A—C5A | 1.4281 (19) | C10A—H10A | 0.9700 |
N1A—C1A | 1.4640 (17) | C10A—H10B | 0.9700 |
N1A—C9A | 1.4658 (16) | C11A—H11A | 0.9700 |
N1A—C12A | 1.4578 (17) | C11A—H11B | 0.9700 |
N2A—H2AA | 0.9000 | C11A—C12A | 1.510 (2) |
N2A—H2AB | 0.9000 | C12A—H12A | 0.9700 |
N2A—C10A | 1.4818 (17) | C12A—H12B | 0.9700 |
N2A—C11A | 1.4829 (18) | Cl1B—C4B | 1.7391 (14) |
C1A—H1AA | 0.9700 | O1B—C7B | 1.2573 (16) |
C1A—H1AB | 0.9700 | O2B—C7B | 1.2554 (16) |
C1A—C2A | 1.5069 (19) | C1B—C2B | 1.3916 (18) |
C2A—C3A | 1.4019 (19) | C1B—C6B | 1.3873 (18) |
C2A—C8A | 1.382 (2) | C1B—C7B | 1.5079 (18) |
C3A—H3A | 0.9300 | C2B—H2B | 0.9300 |
C3A—C4A | 1.3619 (19) | C2B—C3B | 1.386 (2) |
C4A—C6A | 1.3820 (19) | C3B—H3B | 0.9300 |
C5A—H5AA | 0.9700 | C3B—C4B | 1.380 (2) |
C5A—H5AB | 0.9700 | C4B—C5B | 1.382 (2) |
C6A—C7A | 1.357 (2) | C5B—H5B | 0.9300 |
C7A—H7A | 0.9300 | C5B—C6B | 1.3896 (19) |
C7A—C8A | 1.394 (2) | C6B—H6B | 0.9300 |
C8A—H8A | 0.9300 | | |
| | | |
C6A—O1A—C5A | 104.75 (11) | N1A—C9A—C10A | 110.67 (11) |
C4A—O2A—C5A | 104.70 (12) | H9AA—C9A—H9AB | 108.1 |
C1A—N1A—C9A | 110.44 (11) | C10A—C9A—H9AA | 109.5 |
C12A—N1A—C1A | 110.11 (11) | C10A—C9A—H9AB | 109.5 |
C12A—N1A—C9A | 109.66 (10) | N2A—C10A—C9A | 110.53 (11) |
H2AA—N2A—H2AB | 108.1 | N2A—C10A—H10A | 109.5 |
C10A—N2A—H2AA | 109.5 | N2A—C10A—H10B | 109.5 |
C10A—N2A—H2AB | 109.5 | C9A—C10A—H10A | 109.5 |
C10A—N2A—C11A | 110.60 (10) | C9A—C10A—H10B | 109.5 |
C11A—N2A—H2AA | 109.5 | H10A—C10A—H10B | 108.1 |
C11A—N2A—H2AB | 109.5 | N2A—C11A—H11A | 109.6 |
N1A—C1A—H1AA | 109.1 | N2A—C11A—H11B | 109.6 |
N1A—C1A—H1AB | 109.1 | N2A—C11A—C12A | 110.45 (12) |
N1A—C1A—C2A | 112.49 (11) | H11A—C11A—H11B | 108.1 |
H1AA—C1A—H1AB | 107.8 | C12A—C11A—H11A | 109.6 |
C2A—C1A—H1AA | 109.1 | C12A—C11A—H11B | 109.6 |
C2A—C1A—H1AB | 109.1 | N1A—C12A—C11A | 110.74 (11) |
C3A—C2A—C1A | 119.20 (13) | N1A—C12A—H12A | 109.5 |
C8A—C2A—C1A | 121.06 (13) | N1A—C12A—H12B | 109.5 |
C8A—C2A—C3A | 119.71 (13) | C11A—C12A—H12A | 109.5 |
C2A—C3A—H3A | 121.4 | C11A—C12A—H12B | 109.5 |
C4A—C3A—C2A | 117.16 (13) | H12A—C12A—H12B | 108.1 |
C4A—C3A—H3A | 121.4 | C2B—C1B—C7B | 120.21 (12) |
O2A—C4A—C6A | 109.64 (12) | C6B—C1B—C2B | 119.24 (12) |
C3A—C4A—O2A | 127.79 (13) | C6B—C1B—C7B | 120.56 (11) |
C3A—C4A—C6A | 122.46 (13) | C1B—C2B—H2B | 119.6 |
O1A—C5A—O2A | 107.89 (12) | C3B—C2B—C1B | 120.80 (13) |
O1A—C5A—H5AA | 110.1 | C3B—C2B—H2B | 119.6 |
O1A—C5A—H5AB | 110.1 | C2B—C3B—H3B | 120.7 |
O2A—C5A—H5AA | 110.1 | C4B—C3B—C2B | 118.69 (13) |
O2A—C5A—H5AB | 110.1 | C4B—C3B—H3B | 120.7 |
H5AA—C5A—H5AB | 108.4 | C3B—C4B—Cl1B | 118.85 (11) |
O1A—C6A—C4A | 109.57 (13) | C3B—C4B—C5B | 121.83 (13) |
C7A—C6A—O1A | 128.82 (13) | C5B—C4B—Cl1B | 119.31 (11) |
C7A—C6A—C4A | 121.54 (13) | C4B—C5B—H5B | 120.6 |
C6A—C7A—H7A | 121.6 | C4B—C5B—C6B | 118.77 (13) |
C6A—C7A—C8A | 116.78 (13) | C6B—C5B—H5B | 120.6 |
C8A—C7A—H7A | 121.6 | C1B—C6B—C5B | 120.64 (12) |
C2A—C8A—C7A | 122.33 (14) | C1B—C6B—H6B | 119.7 |
C2A—C8A—H8A | 118.8 | C5B—C6B—H6B | 119.7 |
C7A—C8A—H8A | 118.8 | O1B—C7B—C1B | 118.33 (12) |
N1A—C9A—H9AA | 109.5 | O2B—C7B—O1B | 124.75 (13) |
N1A—C9A—H9AB | 109.5 | O2B—C7B—C1B | 116.92 (12) |
| | | |
O1A—C6A—C7A—C8A | −176.43 (14) | C6A—C7A—C8A—C2A | 1.1 (2) |
O2A—C4A—C6A—O1A | 0.07 (16) | C8A—C2A—C3A—C4A | 1.3 (2) |
O2A—C4A—C6A—C7A | −177.15 (13) | C9A—N1A—C1A—C2A | 174.49 (12) |
N1A—C1A—C2A—C3A | −49.87 (18) | C9A—N1A—C12A—C11A | −59.59 (14) |
N1A—C1A—C2A—C8A | 132.26 (14) | C10A—N2A—C11A—C12A | −55.32 (15) |
N1A—C9A—C10A—N2A | −57.53 (14) | C11A—N2A—C10A—C9A | 55.29 (14) |
N2A—C11A—C12A—N1A | 57.83 (15) | C12A—N1A—C1A—C2A | −64.26 (15) |
C1A—N1A—C9A—C10A | −179.02 (11) | C12A—N1A—C9A—C10A | 59.46 (14) |
C1A—N1A—C12A—C11A | 178.69 (11) | Cl1B—C4B—C5B—C6B | −178.09 (10) |
C1A—C2A—C3A—C4A | −176.59 (13) | C1B—C2B—C3B—C4B | 1.0 (2) |
C1A—C2A—C8A—C7A | 175.95 (13) | C2B—C1B—C6B—C5B | −2.03 (19) |
C2A—C3A—C4A—O2A | 175.68 (13) | C2B—C1B—C7B—O1B | −165.32 (12) |
C2A—C3A—C4A—C6A | 0.0 (2) | C2B—C1B—C7B—O2B | 14.80 (18) |
C3A—C2A—C8A—C7A | −1.9 (2) | C2B—C3B—C4B—Cl1B | 177.00 (10) |
C3A—C4A—C6A—O1A | 176.46 (13) | C2B—C3B—C4B—C5B | −1.9 (2) |
C3A—C4A—C6A—C7A | −0.8 (2) | C3B—C4B—C5B—C6B | 0.8 (2) |
C4A—O2A—C5A—O1A | 18.16 (18) | C4B—C5B—C6B—C1B | 1.22 (19) |
C4A—C6A—C7A—C8A | 0.2 (2) | C6B—C1B—C2B—C3B | 0.89 (19) |
C5A—O1A—C6A—C4A | 11.18 (16) | C6B—C1B—C7B—O1B | 14.36 (18) |
C5A—O1A—C6A—C7A | −171.86 (16) | C6B—C1B—C7B—O2B | −165.52 (12) |
C5A—O2A—C4A—C3A | 172.60 (15) | C7B—C1B—C2B—C3B | −179.42 (12) |
C5A—O2A—C4A—C6A | −11.25 (16) | C7B—C1B—C6B—C5B | 178.29 (11) |
C6A—O1A—C5A—O2A | −18.11 (17) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H2AA···O1Bi | 0.90 | 1.87 | 2.7606 (15) | 171 |
N2A—H2AB···O2Bii | 0.90 | 1.78 | 2.6684 (16) | 169 |
C10A—H10A···O2Biii | 0.97 | 2.57 | 3.1974 (17) | 122 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x+1, −y+3/2, z−1/2; (iii) −x+1, −y+2, −z+1. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N2A—H2AA···O1Bi | 0.90 | 1.87 | 2.7606 (15) | 170.9 |
N2A—H2AB···O2Bii | 0.90 | 1.78 | 2.6684 (16) | 168.9 |
C10A—H10A···O2Biii | 0.97 | 2.57 | 3.1974 (17) | 122.2 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x+1, −y+3/2, z−1/2; (iii) −x+1, −y+2, −z+1. |
1-(3,4-Methylenedioxybenzyl)piperazine or 1-piperonylpiperazine is a psychoactive drug of the piperazine class and is used to synthesise the drug, piribedil, an antiparkinsonian agent (Millan et al., 2001). Piperonylpiperazine derivatives also have α-adrenergic antagonist properties (Gobert et al., 2003) and peripheral vasodilator properties (Gilbert et al., 1968). Piperazines are among the most important building blocks in today's drug discovery and are found in biologically active compounds across a number of different therapeutic areas (Brockunier et al., 2004; Bogatcheva et al., 2006). A review of the current pharmacological and toxicological information for piperazine derivatives is described (Elliott, 2011). The crystal structure of an N-piperonyl analogue of the atypical antipsychotic clozapine (Capuano et al., 2000) is reported. In continuation of our work on salts of piperonylpiperazines, this paper reports the crystal structure of the title compound (I).
The asymmetric unit of (I) consists of a 1-piperonylpiperazinium cation and a p-chlorobenzoate anion (Fig. 1). The piperazine ring in the cation adopts a slightly disordered chair conformation (puckering parameters Q, θ, and φ = 0.5761 (14) Å , 177.7 (2) ° and 177 (4) °; (Cremer & Pople, 1975). The dioxole group is in a slightly distorted envelope configuration (puckering parameters Q and φ = 0.1693 (15) Å and 36.1 (5) ° with atom C5A displaced by 0.2683 (18) Å from the plane through the other four atoms). The piperonyl ring system and the piperazine rings are twisted with respect to each other as reflected in the N1A-C1A-C2A-C8A torsion angle of 132.2 (5)°. In the anion, the mean plane of the carboxylate group is twisted from that of the benzene ring by 14.8 (9)°. Bond lengths are in normal ranges (Allen et al., 1987). In the crystal, N—H···O hydrogen bonds and a weak C10A—H10A···O2Biii intermolecular interactions are observed which influence the crystal packing stability forming 1-D chains along [0 1 0] (Fig. 2).