organic compounds
Adamantane-1-ammonium benzoate
aOrdered Matter Science Research Center, College of Chemistry and Chemical, Engineering, Southeast University, Nanjing 211189, People's Republic of China
*Correspondence e-mail: wsp1314@126.com
In the title molecular salt, C10H15NH3+·C7H5O2−, both carboxyl O atoms act as acceptors for strong N—H⋯O intermolecular hydrogen-bond interactions with the ammonium group in the cation, generating infinite chains along the b axis. A weak C—H⋯π interaction is also present.
Related literature
For related structures, see: Tukada & Mochizuki (2003); Zhao et al. (2003); He & Wen (2006). For puckering parameters, see: Cremer & Pople (1975).
Experimental
Crystal data
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Refinement
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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
https://doi.org/10.1107/S1600536809036903/jj2008sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809036903/jj2008Isup2.hkl
A mixture of adamantane-1- ammonium hydrochloride (10 mmol), sodiumbenzoate (10 mmol) and methanol (50 ml) was stirred in a beaker. There were many solid powders produced and the solution was filtered. Colorless single crystals of the title compound suitable for X-ray analysis were obtained by slow evaporation of the solvents over a period of 20 h.
Positional parameters of all the H atoms were calculated geometrically (aromatic C–H = 0.93 A°, aliphatic C–H = 0.97 A°) & N–H = 0.89Å) and were allowed to ride on the C,N atoms to which they are bonded, with Uiso(H) = 1.2-1.5Ueq(C,N).
Owing to its highly symmetrical and stable structure, adamantane and its derivatives have generated much interest in the past and continue to be actively studied as evidenced by the large number of compounds containing amantadine that have been synthesized (Tukada & Mochizuki, 2003; Zhao et al., 2003; He & Wen, 2006). Here we report the synthesis and
of the title compound,(I), C10H15NH3+ . C7H5O2-, a salt obtained from the reaction of adamantane-1-ammonium hydrochloride and sodium benzoate (Fig. 1).The adamantane-1-ammonium cation contains four 6-membered rings in a cage-like structure each in a slightly distorted boat conformation and with a protonated N atom at the 1-position. Puckering parameters (Cremer & Pople, 1975) Q, θ and φ are for rings 1–4 [(1) 0.630 (2) Å, 1.48 (18)°,272 (54)°; (2) 0.6247 (19)Å,178.36 (17)°, 251 (423)°; (3) 0.621 (4)Å,0.67 (18)°, 240 (54)°; (4)0.6207 (19)Å, 0.55 (18)°, 218 (39)°] where (1) = C7–C9/C13–C15, (2) = C7/C8/C10/C11/C16/C15, (3) = C8/C9/C13/C12/C11/C10 and (4) = C11–C16. C—C distances range from 1.518 (2)Å to 1.531 (3)Å and C—C—C angles range from 108.93 (13)° to 109.91 (13)°, while the exocyclic C—N bond length is 1.4924 (19)Å. These values are similar to that observed in adamantane-1-ammonium 2-nitrobenzoate (C—C = 1.5254 (18)Å to 1.532 (2)Å, C—C—C 109.06 (13)° to 109.84 (11)°, C—N = 1.4967 (18)Å (He & Wen, 2006). Both the negativly charged and neutral oxygen atoms in the benzoate anion are involved in strong N—H···O intermolecular hydrogen bond interactions with the ammonium cation group generating infinite one-dimensional chains along the b axis of the (Fig. 2, Table 1). In addition, weak π-ring C16–H16A···Cg1 interactions exist which contribute to crystal stability (Cg1 is the center of gravity of ring 1).
For related structures, see: Tukada & Mochizuki (2003); Zhao et al. (2003); He & Wen (2006). For puckering parameters, see: Cremer & Pople (1975). Cg1 is the centroid of the C7–C9/C13–C15 ring.
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).C10H18N+·C7H5O2− | F(000) = 592 |
Mr = 273.36 | Dx = 1.214 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 12490 reflections |
a = 10.918 (2) Å | θ = 3.2–27.7° |
b = 6.5664 (13) Å | µ = 0.08 mm−1 |
c = 21.197 (4) Å | T = 298 K |
β = 100.07 (3)° | Prism, colourless |
V = 1496.3 (5) Å3 | 0.20 × 0.20 × 0.20 mm |
Z = 4 |
Rigaku SCXmini diffractometer | 3437 independent reflections |
Radiation source: fine-focus sealed tube | 2453 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.043 |
Detector resolution: 13.6612 pixels mm-1 | θmax = 27.5°, θmin = 3.2° |
CCD_Profile_fitting scans | h = −14→14 |
Absorption correction: multi-scan (CrystalClear; Rigaku, 2005) | k = −8→8 |
Tmin = 0.774, Tmax = 1.000 | l = −27→26 |
15027 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.055 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.147 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0654P)2 + 0.3147P] where P = (Fo2 + 2Fc2)/3 |
3437 reflections | (Δ/σ)max < 0.001 |
181 parameters | Δρmax = 0.20 e Å−3 |
0 restraints | Δρmin = −0.26 e Å−3 |
C10H18N+·C7H5O2− | V = 1496.3 (5) Å3 |
Mr = 273.36 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 10.918 (2) Å | µ = 0.08 mm−1 |
b = 6.5664 (13) Å | T = 298 K |
c = 21.197 (4) Å | 0.20 × 0.20 × 0.20 mm |
β = 100.07 (3)° |
Rigaku SCXmini diffractometer | 3437 independent reflections |
Absorption correction: multi-scan (CrystalClear; Rigaku, 2005) | 2453 reflections with I > 2σ(I) |
Tmin = 0.774, Tmax = 1.000 | Rint = 0.043 |
15027 measured reflections |
R[F2 > 2σ(F2)] = 0.055 | 0 restraints |
wR(F2) = 0.147 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.20 e Å−3 |
3437 reflections | Δρmin = −0.26 e Å−3 |
181 parameters |
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. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.56217 (14) | 0.6892 (3) | 0.15342 (7) | 0.0405 (4) | |
C2 | 0.47020 (13) | 0.7614 (2) | 0.09647 (7) | 0.0365 (3) | |
C3 | 0.41146 (17) | 0.6184 (3) | 0.05392 (8) | 0.0551 (5) | |
H3A | 0.4282 | 0.4807 | 0.0612 | 0.066* | |
C4 | 0.3278 (2) | 0.6789 (3) | 0.00041 (9) | 0.0718 (6) | |
H4A | 0.2899 | 0.5820 | −0.0286 | 0.086* | |
C5 | 0.30094 (19) | 0.8799 (4) | −0.00983 (9) | 0.0707 (6) | |
H5A | 0.2439 | 0.9201 | −0.0455 | 0.085* | |
C6 | 0.35764 (18) | 1.0225 (3) | 0.03223 (9) | 0.0651 (5) | |
H6A | 0.3385 | 1.1596 | 0.0253 | 0.078* | |
C7 | 0.44324 (15) | 0.9646 (3) | 0.08504 (8) | 0.0481 (4) | |
H7A | 0.4828 | 1.0629 | 0.1130 | 0.058* | |
C8 | 0.93359 (16) | 0.8861 (2) | 0.16653 (8) | 0.0463 (4) | |
H8A | 0.9568 | 1.0003 | 0.1952 | 0.056* | |
H8B | 0.8483 | 0.9057 | 0.1452 | 0.056* | |
C9 | 0.94432 (13) | 0.6891 (2) | 0.20453 (7) | 0.0347 (3) | |
C10 | 0.90627 (16) | 0.5096 (2) | 0.15964 (8) | 0.0472 (4) | |
H10A | 0.9123 | 0.3838 | 0.1840 | 0.057* | |
H10B | 0.8207 | 0.5260 | 0.1383 | 0.057* | |
C11 | 0.99218 (19) | 0.5007 (3) | 0.11014 (9) | 0.0591 (5) | |
H11A | 0.9681 | 0.3859 | 0.0811 | 0.071* | |
C12 | 0.98200 (19) | 0.6977 (3) | 0.07187 (9) | 0.0633 (5) | |
H12A | 0.8972 | 0.7158 | 0.0496 | 0.076* | |
H12B | 1.0360 | 0.6915 | 0.0401 | 0.076* | |
C13 | 1.01933 (18) | 0.8766 (3) | 0.11689 (9) | 0.0548 (5) | |
H13A | 1.0126 | 1.0035 | 0.0922 | 0.066* | |
C14 | 1.07795 (14) | 0.6598 (3) | 0.23908 (8) | 0.0474 (4) | |
H14A | 1.0846 | 0.5347 | 0.2638 | 0.057* | |
H14B | 1.1021 | 0.7723 | 0.2683 | 0.057* | |
C15 | 1.16369 (16) | 0.6503 (3) | 0.18941 (9) | 0.0596 (5) | |
H15A | 1.2497 | 0.6317 | 0.2113 | 0.071* | |
C16 | 1.15367 (17) | 0.8477 (3) | 0.15120 (10) | 0.0628 (5) | |
H16A | 1.2089 | 0.8428 | 0.1200 | 0.075* | |
H16B | 1.1783 | 0.9616 | 0.1797 | 0.075* | |
C17 | 1.1262 (2) | 0.4714 (3) | 0.14452 (11) | 0.0689 (6) | |
H17A | 1.1330 | 0.3455 | 0.1688 | 0.083* | |
H17B | 1.1813 | 0.4629 | 0.1134 | 0.083* | |
N1 | 0.85951 (11) | 0.69816 (19) | 0.25257 (6) | 0.0393 (3) | |
H1A | 0.8810 | 0.8025 | 0.2790 | 0.059* | |
H1B | 0.8654 | 0.5828 | 0.2749 | 0.059* | |
H1C | 0.7815 | 0.7146 | 0.2324 | 0.059* | |
O1 | 0.57302 (14) | 0.5030 (2) | 0.16200 (6) | 0.0744 (5) | |
O2 | 0.62592 (11) | 0.81896 (19) | 0.18784 (6) | 0.0594 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0380 (8) | 0.0485 (9) | 0.0338 (8) | 0.0034 (7) | 0.0030 (6) | −0.0005 (7) |
C2 | 0.0332 (7) | 0.0430 (8) | 0.0325 (7) | −0.0025 (6) | 0.0039 (6) | 0.0033 (6) |
C3 | 0.0573 (10) | 0.0494 (10) | 0.0514 (10) | −0.0022 (8) | −0.0102 (8) | −0.0026 (8) |
C4 | 0.0713 (13) | 0.0782 (15) | 0.0541 (11) | −0.0070 (11) | −0.0218 (10) | −0.0098 (10) |
C5 | 0.0622 (12) | 0.0890 (16) | 0.0518 (11) | 0.0029 (11) | −0.0148 (9) | 0.0201 (11) |
C6 | 0.0635 (12) | 0.0581 (12) | 0.0670 (12) | 0.0025 (9) | −0.0073 (10) | 0.0234 (10) |
C7 | 0.0473 (9) | 0.0454 (9) | 0.0482 (9) | −0.0030 (7) | −0.0012 (7) | 0.0045 (7) |
C8 | 0.0529 (9) | 0.0362 (9) | 0.0467 (9) | 0.0043 (7) | −0.0002 (7) | 0.0037 (7) |
C9 | 0.0346 (7) | 0.0325 (7) | 0.0343 (7) | −0.0002 (6) | −0.0019 (6) | −0.0008 (6) |
C10 | 0.0521 (9) | 0.0385 (9) | 0.0493 (9) | −0.0068 (7) | 0.0046 (8) | −0.0090 (7) |
C11 | 0.0723 (12) | 0.0516 (11) | 0.0546 (11) | −0.0037 (9) | 0.0137 (9) | −0.0182 (8) |
C12 | 0.0675 (12) | 0.0823 (14) | 0.0398 (9) | −0.0007 (10) | 0.0083 (9) | −0.0031 (9) |
C13 | 0.0648 (11) | 0.0487 (10) | 0.0507 (10) | −0.0016 (8) | 0.0092 (9) | 0.0150 (8) |
C14 | 0.0391 (8) | 0.0527 (10) | 0.0461 (9) | 0.0016 (7) | −0.0045 (7) | 0.0046 (7) |
C15 | 0.0375 (8) | 0.0759 (13) | 0.0635 (11) | 0.0061 (8) | 0.0036 (8) | 0.0076 (10) |
C16 | 0.0528 (10) | 0.0718 (13) | 0.0651 (12) | −0.0150 (9) | 0.0134 (9) | 0.0019 (10) |
C17 | 0.0717 (13) | 0.0601 (12) | 0.0810 (14) | 0.0191 (10) | 0.0297 (11) | 0.0009 (10) |
N1 | 0.0371 (6) | 0.0397 (7) | 0.0375 (7) | 0.0005 (5) | −0.0030 (5) | −0.0023 (5) |
O1 | 0.0912 (11) | 0.0536 (9) | 0.0663 (9) | 0.0002 (7) | −0.0200 (8) | 0.0209 (6) |
O2 | 0.0484 (7) | 0.0625 (8) | 0.0575 (7) | 0.0142 (6) | −0.0177 (6) | −0.0197 (6) |
C1—O1 | 1.238 (2) | C10—H10B | 0.9700 |
C1—O2 | 1.2512 (19) | C11—C12 | 1.520 (3) |
C1—C2 | 1.505 (2) | C11—C17 | 1.528 (3) |
C2—C7 | 1.378 (2) | C11—H11A | 0.9800 |
C2—C3 | 1.380 (2) | C12—C13 | 1.523 (3) |
C3—C4 | 1.384 (3) | C12—H12A | 0.9700 |
C3—H3A | 0.9300 | C12—H12B | 0.9700 |
C4—C5 | 1.361 (3) | C13—C16 | 1.531 (3) |
C4—H4A | 0.9300 | C13—H13A | 0.9800 |
C5—C6 | 1.365 (3) | C14—C15 | 1.528 (2) |
C5—H5A | 0.9300 | C14—H14A | 0.9700 |
C6—C7 | 1.380 (2) | C14—H14B | 0.9700 |
C6—H6A | 0.9300 | C15—C17 | 1.522 (3) |
C7—H7A | 0.9300 | C15—C16 | 1.522 (3) |
C8—C9 | 1.518 (2) | C15—H15A | 0.9800 |
C8—C13 | 1.527 (2) | C16—H16A | 0.9700 |
C8—H8A | 0.9700 | C16—H16B | 0.9700 |
C8—H8B | 0.9700 | C17—H17A | 0.9700 |
C9—N1 | 1.4925 (19) | C17—H17B | 0.9700 |
C9—C14 | 1.526 (2) | N1—H1A | 0.8900 |
C9—C10 | 1.526 (2) | N1—H1B | 0.8900 |
C10—C11 | 1.526 (2) | N1—H1C | 0.8900 |
C10—H10A | 0.9700 | ||
O1—C1—O2 | 123.88 (15) | C17—C11—H11A | 109.4 |
O1—C1—C2 | 117.52 (14) | C11—C12—C13 | 109.58 (14) |
O2—C1—C2 | 118.55 (15) | C11—C12—H12A | 109.8 |
C7—C2—C3 | 118.90 (15) | C13—C12—H12A | 109.8 |
C7—C2—C1 | 122.54 (14) | C11—C12—H12B | 109.8 |
C3—C2—C1 | 118.55 (14) | C13—C12—H12B | 109.8 |
C2—C3—C4 | 120.31 (18) | H12A—C12—H12B | 108.2 |
C2—C3—H3A | 119.8 | C12—C13—C8 | 109.53 (15) |
C4—C3—H3A | 119.8 | C12—C13—C16 | 109.35 (16) |
C5—C4—C3 | 120.12 (18) | C8—C13—C16 | 109.25 (15) |
C5—C4—H4A | 119.9 | C12—C13—H13A | 109.6 |
C3—C4—H4A | 119.9 | C8—C13—H13A | 109.6 |
C4—C5—C6 | 120.05 (17) | C16—C13—H13A | 109.6 |
C4—C5—H5A | 120.0 | C9—C14—C15 | 108.92 (13) |
C6—C5—H5A | 120.0 | C9—C14—H14A | 109.9 |
C5—C6—C7 | 120.41 (18) | C15—C14—H14A | 109.9 |
C5—C6—H6A | 119.8 | C9—C14—H14B | 109.9 |
C7—C6—H6A | 119.8 | C15—C14—H14B | 109.9 |
C2—C7—C6 | 120.18 (16) | H14A—C14—H14B | 108.3 |
C2—C7—H7A | 119.9 | C17—C15—C16 | 109.76 (16) |
C6—C7—H7A | 119.9 | C17—C15—C14 | 109.41 (15) |
C9—C8—C13 | 109.32 (13) | C16—C15—C14 | 109.63 (15) |
C9—C8—H8A | 109.8 | C17—C15—H15A | 109.3 |
C13—C8—H8A | 109.8 | C16—C15—H15A | 109.3 |
C9—C8—H8B | 109.8 | C14—C15—H15A | 109.3 |
C13—C8—H8B | 109.8 | C15—C16—C13 | 109.38 (15) |
H8A—C8—H8B | 108.3 | C15—C16—H16A | 109.8 |
N1—C9—C8 | 109.18 (12) | C13—C16—H16A | 109.8 |
N1—C9—C14 | 109.45 (12) | C15—C16—H16B | 109.8 |
C8—C9—C14 | 109.91 (13) | C13—C16—H16B | 109.8 |
N1—C9—C10 | 108.82 (12) | H16A—C16—H16B | 108.2 |
C8—C9—C10 | 109.89 (12) | C15—C17—C11 | 109.36 (15) |
C14—C9—C10 | 109.58 (13) | C15—C17—H17A | 109.8 |
C11—C10—C9 | 108.97 (13) | C11—C17—H17A | 109.8 |
C11—C10—H10A | 109.9 | C15—C17—H17B | 109.8 |
C9—C10—H10A | 109.9 | C11—C17—H17B | 109.8 |
C11—C10—H10B | 109.9 | H17A—C17—H17B | 108.3 |
C9—C10—H10B | 109.9 | C9—N1—H1A | 109.5 |
H10A—C10—H10B | 108.3 | C9—N1—H1B | 109.5 |
C12—C11—C10 | 109.76 (15) | H1A—N1—H1B | 109.5 |
C12—C11—C17 | 109.64 (17) | C9—N1—H1C | 109.5 |
C10—C11—C17 | 109.22 (15) | H1A—N1—H1C | 109.5 |
C12—C11—H11A | 109.4 | H1B—N1—H1C | 109.5 |
C10—C11—H11A | 109.4 |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···O1i | 0.89 | 1.83 | 2.7134 (17) | 176 |
N1—H1B···O2ii | 0.89 | 1.90 | 2.7840 (18) | 173 |
N1—H1C···O2 | 0.89 | 1.92 | 2.7915 (18) | 166 |
C16—H16A···Cg1iii | 0.97 | 2.74 | 3.702 (2) | 174 |
Symmetry codes: (i) −x+3/2, y+1/2, −z+1/2; (ii) −x+3/2, y−1/2, −z+1/2; (iii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C10H18N+·C7H5O2− |
Mr | 273.36 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 298 |
a, b, c (Å) | 10.918 (2), 6.5664 (13), 21.197 (4) |
β (°) | 100.07 (3) |
V (Å3) | 1496.3 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.20 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Rigaku SCXmini |
Absorption correction | Multi-scan (CrystalClear; Rigaku, 2005) |
Tmin, Tmax | 0.774, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15027, 3437, 2453 |
Rint | 0.043 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.055, 0.147, 1.04 |
No. of reflections | 3437 |
No. of parameters | 181 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.20, −0.26 |
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—H1A···O1i | 0.89 | 1.83 | 2.7134 (17) | 175.8 |
N1—H1B···O2ii | 0.89 | 1.90 | 2.7840 (18) | 172.5 |
N1—H1C···O2 | 0.89 | 1.92 | 2.7915 (18) | 166 |
C16—H16A···Cg1iii | 0.97 | 2.7359 | 3.702 (2) | 173.73 |
Symmetry codes: (i) −x+3/2, y+1/2, −z+1/2; (ii) −x+3/2, y−1/2, −z+1/2; (iii) x+1, y, z. |
Acknowledgements
The authors are grateful to the starter fund of Southeast University for financial support to buy the X-ray diffractometer.
References
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Owing to its highly symmetrical and stable structure, adamantane and its derivatives have generated much interest in the past and continue to be actively studied as evidenced by the large number of compounds containing amantadine that have been synthesized (Tukada & Mochizuki, 2003; Zhao et al., 2003; He & Wen, 2006). Here we report the synthesis and crystal structure of the title compound,(I), C10H15NH3+ . C7H5O2-, a salt obtained from the reaction of adamantane-1-ammonium hydrochloride and sodium benzoate (Fig. 1).
The adamantane-1-ammonium cation contains four 6-membered rings in a cage-like structure each in a slightly distorted boat conformation and with a protonated N atom at the 1-position. Puckering parameters (Cremer & Pople, 1975) Q, θ and φ are for rings 1–4 [(1) 0.630 (2) Å, 1.48 (18)°,272 (54)°; (2) 0.6247 (19)Å,178.36 (17)°, 251 (423)°; (3) 0.621 (4)Å,0.67 (18)°, 240 (54)°; (4)0.6207 (19)Å, 0.55 (18)°, 218 (39)°] where (1) = C7–C9/C13–C15, (2) = C7/C8/C10/C11/C16/C15, (3) = C8/C9/C13/C12/C11/C10 and (4) = C11–C16. C—C distances range from 1.518 (2)Å to 1.531 (3)Å and C—C—C angles range from 108.93 (13)° to 109.91 (13)°, while the exocyclic C—N bond length is 1.4924 (19)Å. These values are similar to that observed in adamantane-1-ammonium 2-nitrobenzoate (C—C = 1.5254 (18)Å to 1.532 (2)Å, C—C—C 109.06 (13)° to 109.84 (11)°, C—N = 1.4967 (18)Å (He & Wen, 2006). Both the negativly charged and neutral oxygen atoms in the benzoate anion are involved in strong N—H···O intermolecular hydrogen bond interactions with the ammonium cation group generating infinite one-dimensional chains along the b axis of the unit cell (Fig. 2, Table 1). In addition, weak π-ring C16–H16A···Cg1 interactions exist which contribute to crystal stability (Cg1 is the center of gravity of ring 1).