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Acta Crystallogr Sect E Struct Rep Online. 2009 February 1; 65(Pt 2): o245.
Published online 2009 January 8. doi:  10.1107/S1600536808044243
PMCID: PMC2968223

Redetermination of 1-carboxy­cyclo­hexan-1-aminium chloride

Abstract

The crystal structure of the title compound, C7H14NO2 +·Cl, was reported previously [Chacko, Srinivasan & Zand (1975 [triangle]). J. Cryst. Mol. Struct. 5, 353–357] from Weissenberg photographic data with R = 0.113. It has now been redetermined, providing a significant increase in the precision of the derived geometric parameters, viz. mean σ(C—C) = 0.003 Å in the present work compared with 0.021 Å for the previous work. The complete cation is generated by crystallographic mirrror symmetry, with three C atoms, two O atoms and the N atom lying on the reflecting plane; the chloride anion also has m site symmetry. The crystal structure is established by a two-dimensional network of O—H(...)Cl and N—H(...)Cl hydrogen bonds, generating C 1 2(4) and C 1 2(7) chains, and R 2 4(8) and R 2 4(14) rings.

Related literature

For the earlier structure determination of the title salt, see: Chacko et al. (1971 [triangle], 1975 [triangle]). For related literature, see Rodríguez-Ropero et al. (2008 [triangle]). For the crystal structure of the pure amino acid, see: Valle et al. (1988 [triangle]). For ring conformation analysis, see: Cremer & Pople (1975 [triangle]). For hydrogen-bond motifs in graph-set notation, see: Etter (1990 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-65-0o245-scheme1.jpg

Experimental

Crystal data

  • C7H14NO2 +·Cl
  • M r = 179.64
  • Monoclinic, An external file that holds a picture, illustration, etc.
Object name is e-65-0o245-efi2.jpg
  • a = 7.382 (3) Å
  • b = 6.357 (2) Å
  • c = 9.374 (3) Å
  • β = 96.239 (10)°
  • V = 437.3 (3) Å3
  • Z = 2
  • Mo Kα radiation
  • μ = 0.39 mm−1
  • T = 298 (2) K
  • 0.31 × 0.27 × 0.18 mm

Data collection

  • Rigaku AFC-7S Mercury diffractometer
  • Absorption correction: multi-scan (Jacobson, 1998 [triangle]) T min = 0.880, T max = 0.930
  • 4638 measured reflections
  • 845 independent reflections
  • 789 reflections with I > 2σ(I)
  • R int = 0.023

Refinement

  • R[F 2 > 2σ(F 2)] = 0.033
  • wR(F 2) = 0.088
  • S = 1.01
  • 845 reflections
  • 85 parameters
  • H atoms treated by a mixture of independent and constrained refinement
  • Δρmax = 0.18 e Å−3
  • Δρmin = −0.15 e Å−3

Data collection: CrystalClear (Rigaku, 2002 [triangle]); cell refinement: CrystalClear; data reduction: CrystalStructure (Rigaku/MSC, 2004 [triangle]); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: DIAMOND (Brandenburg, 1999 [triangle]); software used to prepare material for publication: PLATON (Spek, 2003 [triangle]) and publCIF (Westrip, 2009 [triangle]).

Table 1
Hydrogen-bond geometry (Å, °)

Supplementary Material

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808044243/bh2212sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536808044243/bh2212Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

This work was supported by CDCHT-ULA (grant Nos. C-1618-08-A, C-1615-08-B and C-1620-08-08-Em) and FONACIT (grant No. LAB-97000821).

supplementary crystallographic information

Comment

1-Amino-cyclohexanecarboxylic acid is a promising amino acid candidate to serve as basic piece in redesigned protein motifs which constitute the basic modules in synthetic nanoconstructs (Rodríguez-Ropero et al., 2008). It structure was reported by Valle et al. (1988). The title compound, (I), 1-amino-cyclohexanecarboxylic acid hydrochloride, C7H14NO2+.Cl-, was first reported in the noncentric space group P21 (Chacko et al., 1971) and later reported in the centrosymmetric space group P21/m (Chacko et al., 1975) with R = 0.113. The present paper reports a redetermination of the crystal structure of (I), with greater precision and accuracy. Both, the cation and anion are located on a mirror plane, which confirms the space group P21/m instead of P21. In this compound, the cyclohexane ring adopts a chair conformation, with the ammonium and carboxylate groups in axial and equatorial positions, respectively (Cremer & Pople, 1975), while the pure amino acid has an opposite conformation (Valle et al., 1988). In (I), 1-amino-cyclohexanecarboxylic acid is protonated and is linked to the Cl- anion by a O—H···Cl hydrogen bond (Fig. 1, Table 1). The hydrogen bonds O1—H1···Cl1 (x, y, z - 1) and N1—H1B···Cl1 (1 - x, y - 1/2, 1 - z) form infinite chains running along the [001] direction (Fig. 2) and may be described in graph-set notation as C12(7) (Etter, 1990). The intramolecular hydrogen bonds N1—H1A···Cl1 form infinite chains, with graph-set C12(4), running along the b cell axis. The combination of these interactions produces rings with graph-set R24(8) and R24(14), parallel to the bc plane (Fig. 2).

Experimental

1-Amino-cyclohexanecarboxylic acid and hydrochloric acid in equal molar ratio were mixed together with enough water, and heated to a temperature where a clear solution was obtained. Colorless crystals of (I) suitable for X-ray diffraction analysis were grown by slow evaporation of this solution.

Refinement

All H atoms were located in a difference map and their positions were freely refined, with the Uiso(H) values set at 1.2Ueq(carrier C), 1.5Ueq(carrier O) and 1.5Ueq(carrier N), respectively.

Figures

Fig. 1.
The molecular structure of (I), with atom labels and 50% probability displacement ellipsoids for non-H atoms.
Fig. 2.
A partial packing view of (I). Hydrogen bonds are shown as dashed lines. H atoms not involved in hydrogen bonding have been omitted for clarity. Symmetry codes: (i) x, y, z - 1; (ii) 1 - x, y - 1/2, 1 - z.

Crystal data

C7H14NO2+·ClF(000) = 192
Mr = 179.64Dx = 1.364 Mg m3
Monoclinic, P21/mMo Kα radiation, λ = 0.71070 Å
Hall symbol: -P 2ybCell parameters from 1650 reflections
a = 7.382 (3) Åθ = 2.2–27.2°
b = 6.357 (2) ŵ = 0.39 mm1
c = 9.374 (3) ÅT = 298 K
β = 96.239 (10)°Block, colourless
V = 437.3 (3) Å30.31 × 0.27 × 0.18 mm
Z = 2

Data collection

Rigaku AFC-7S Mercury diffractometer845 independent reflections
Radiation source: Normal-focus sealed tube789 reflections with I > 2σ(I)
graphiteRint = 0.023
Detector resolution: 14.6306 pixels mm-1θmax = 25.0°, θmin = 2.2°
ω scansh = −8→8
Absorption correction: multi-scan (Jacobson, 1998)k = −6→7
Tmin = 0.880, Tmax = 0.930l = −11→11
4638 measured reflections

Refinement

Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.033H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.088w = 1/[σ2(Fo2) + (0.047P)2 + 0.1831P] where P = (Fo2 + 2Fc2)/3
S = 1.01(Δ/σ)max < 0.001
845 reflectionsΔρmax = 0.18 e Å3
85 parametersΔρmin = −0.15 e Å3
0 restraintsExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
0 constraintsExtinction coefficient: 0.042 (10)
Primary atom site location: structure-invariant direct methods

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

xyzUiso*/Ueq
Cl0.41343 (8)0.25000.64377 (6)0.0414 (3)
O20.5446 (2)0.25000.04758 (18)0.0511 (5)
O10.2629 (3)0.2500−0.06850 (18)0.0528 (5)
H10.324 (5)0.2500−0.146 (4)0.079*
N10.4370 (3)0.25000.3054 (2)0.0343 (5)
H1A0.506 (3)0.138 (3)0.300 (2)0.051*
H1B0.398 (4)0.25000.393 (3)0.051*
C10.2863 (3)0.25000.1837 (2)0.0292 (5)
C20.1715 (2)0.4484 (3)0.19289 (19)0.0408 (5)
H2A0.251 (3)0.566 (3)0.1923 (19)0.049*
H2B0.090 (3)0.452 (3)0.107 (2)0.049*
C30.0597 (3)0.4450 (4)0.3193 (2)0.0539 (6)
H3A0.140 (3)0.449 (4)0.409 (2)0.065*
H3B−0.018 (3)0.571 (4)0.315 (2)0.065*
C4−0.0557 (4)0.25000.3201 (3)0.0626 (9)
H4A−0.145 (5)0.25000.232 (4)0.075*
H4B−0.148 (5)0.25000.397 (4)0.075*
C50.3819 (3)0.25000.0475 (2)0.0358 (5)

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Cl0.0457 (4)0.0544 (4)0.0238 (4)0.0000.0025 (2)0.000
O20.0359 (10)0.0837 (14)0.0345 (10)0.0000.0078 (7)0.000
O10.0443 (11)0.0932 (15)0.0205 (9)0.0000.0023 (7)0.000
N10.0335 (11)0.0449 (12)0.0238 (10)0.000−0.0002 (8)0.000
C10.0303 (11)0.0355 (12)0.0211 (11)0.000−0.0004 (8)0.000
C20.0439 (10)0.0402 (10)0.0373 (10)0.0074 (8)−0.0004 (8)0.0024 (7)
C30.0497 (11)0.0707 (14)0.0412 (10)0.0221 (10)0.0052 (9)−0.0058 (10)
C40.0386 (15)0.105 (3)0.0449 (17)0.0000.0076 (13)0.000
C50.0385 (13)0.0425 (13)0.0262 (12)0.0000.0025 (10)0.000

Geometric parameters (Å, °)

O2—C51.201 (3)C2—C31.516 (3)
O1—C51.322 (3)C2—H2A0.95 (2)
O1—H10.89 (4)C2—H2B0.95 (2)
N1—C11.504 (3)C3—C41.505 (3)
N1—H1A0.88 (2)C3—H3A0.97 (2)
N1—H1B0.90 (3)C3—H3B0.98 (2)
C1—C51.524 (3)C4—H4A0.99 (3)
C1—C21.528 (2)C4—H4B1.05 (4)
C5—O1—H1109 (2)C4—C3—C2111.85 (19)
C1—N1—H1A110.2 (13)C4—C3—H3A107.9 (13)
C1—N1—H1B114.0 (18)C2—C3—H3A109.9 (12)
H1A—N1—H1B107.1 (16)C4—C3—H3B110.2 (13)
N1—C1—C5105.28 (18)C2—C3—H3B108.4 (13)
N1—C1—C2109.04 (12)H3A—C3—H3B108.5 (17)
C5—C1—C2110.97 (12)C3—C4—H4A108.6 (10)
C3—C2—C1112.64 (16)C3—C4—H4B114.6 (8)
C3—C2—H2A113.8 (11)H4A—C4—H4B99 (3)
C1—C2—H2A107.7 (12)O2—C5—O1125.2 (2)
C3—C2—H2B108.3 (11)O2—C5—C1123.6 (2)
C1—C2—H2B105.8 (12)O1—C5—C1111.2 (2)
H2A—C2—H2B108.2 (16)

Hydrogen-bond geometry (Å, °)

D—H···AD—HH···AD···AD—H···A
N1—H1B···Cl0.90 (3)2.34 (3)3.196 (2)158 (2)
N1—H1A···Cli0.88 (2)2.58 (2)3.3816 (13)152.4 (17)
O1—H1···Clii0.89 (4)2.15 (4)3.027 (2)168 (3)

Symmetry codes: (i) −x+1, y−1/2, −z+1; (ii) x, y, z−1.

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BH2212).

References

  • Brandenburg, K. (1999). DIAMOND Crystal Impact GbR, Bonn, Germany.
  • Chacko, K. K., Srinivasan, R. & Zand, R. (1971). J. Cryst. Mol. Struct.1, 261–269.
  • Chacko, K. K., Srinivasan, R. & Zand, R. (1975). J. Cryst. Mol. Struct.5, 353–357.
  • Cremer, D. & Pople, J. A. (1975). J. Am. Chem. Soc.97, 1354–1358.
  • Etter, M. C. (1990). Acc. Chem. Res.23, 120–126.
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