Buy article online - an online subscription or single-article purchase is required to access this article.
The title compound, (C
8H
12N)
2[Co
2(C
2O
4)
3(H
2O)
4], was prepared under hydrothermal conditions. The structure consists of chiral organic cations and complex anions. Hydrogen bonds and C–H
π(aryl) interactions give a herring-bone arrangement of the cations along the
a axis.
Supporting information
CCDC reference: 650510
Key indicators
- Single-crystal X-ray study
- T = 296 K
- Mean (C-C) = 0.012 Å
- R factor = 0.033
- wR factor = 0.102
- Data-to-parameter ratio = 11.8
checkCIF/PLATON results
No syntax errors found
Alert level C
ABSTM02_ALERT_3_C The ratio of Tmax/Tmin expected RT(exp) is > 1.10
Absorption corrections should be applied.
Tmin and Tmax expected: 0.839 0.951
RT(exp) = 1.134
PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ .... ?
PLAT057_ALERT_3_C Correction for Absorption Required RT(exp) ... 1.14
PLAT341_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ... 12
PLAT369_ALERT_2_C Long C(sp2)-C(sp2) Bond C1 - C2 ... 1.56 Ang.
PLAT369_ALERT_2_C Long C(sp2)-C(sp2) Bond C3 - C4 ... 1.56 Ang.
PLAT731_ALERT_1_C Bond Calc 1.558(17), Rep 1.558(6) ...... 2.83 su-Ra
C1 -C2 1.555 1.555
PLAT731_ALERT_1_C Bond Calc 1.556(11), Rep 1.556(5) ...... 2.20 su-Ra
C4 -C3 1.555 1.555
PLAT732_ALERT_1_C Angle Calc 81.0(2), Rep 81.01(9) ...... 2.22 su-Ra
O3 -CO -O4 1.555 1.555 1.555
PLAT732_ALERT_1_C Angle Calc 79.46(19), Rep 79.45(9) ...... 2.11 su-Ra
O1 -CO -O2 1.555 1.555 1.555
Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
correct. If it is not, please give the correct count in the
_publ_section_exptl_refinement section of the submitted CIF.
From the CIF: _diffrn_reflns_theta_max 25.50
From the CIF: _reflns_number_total 2268
Count of symmetry unique reflns 1418
Completeness (_total/calc) 159.94%
TEST3: Check Friedels for noncentro structure
Estimate of Friedel pairs measured 850
Fraction of Friedel pairs measured 0.599
Are heavy atom types Z>Si present yes
PLAT791_ALERT_1_G Confirm the Absolute Configuration of C11 = . R
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
10 ALERT level C = Check and explain
2 ALERT level G = General alerts; check
6 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
2 ALERT type 2 Indicator that the structure model may be wrong or deficient
3 ALERT type 3 Indicator that the structure quality may be low
1 ALERT type 4 Improvement, methodology, query or suggestion
0 ALERT type 5 Informative message, check
Compound (I) was prepared by the hydrothermal reaction of
Co(C2O4).2H2O(0.130 g, 0.71 mmol), (R)-(+)-1-phenylethylamine
(0.062 g, 0.51 mmol) and water (0.6 ml) at 383 K for 3 d in a sealed
thick-walled Pyrex tube. Light pink crystals of (I) were obtained in 40–50%
yield.
H atoms on C and N atoms were positioned geometrically and refined as riding
atoms, with C—H = 0.93Å (aryl), 0.98Å (CH) and 0.96Å (CH3) and N—H
= 0.89 Å and Uiso(H) = 1.2Ueq(C,N). H atoms on
water molecules were located in a difference Fourier map and fixed with
Uiso(H) = 1.2Ueq(O).
Structure description
top
The crystal structure of the title compound, (I)(Fig. 1), consists of bicobalt
oxalate complex anions [Co2(C2O4)3(H2O)4]2- and organic cations
(C8H12N)+, joined into a two-dimensional sheet by hydrogen bonds. Owing
to the presence of the chiral organic cation, the compound crystallizes in the
polar space group C2. In the anion, there are two types of oxalates. One as
tetradentate ligand bridges two Co atoms, each is coordinated by another type
of oxalate as bidentate ligand in the same plane. Each Co atom is also bonded
by two water molecules above and below the equatorial plane to produce a
negative step-lamella. The bond angles around the Co atom range from
81.01 (9)° to 100.2 (2) °, and from 178.1 (2)° to 178.7 (2)°. The Co—O
distances span from 2.062 (5)Å to 2.114 (3) Å. The organic cation contains a
stereogenic center in its R configuration and has a normal structure
similar to that described elsewhere (Shan & Huang, 2001). The cations are
anchored in the pockets on the both faces of the puckered anionic lamella
through hydrogen bonds with the distances ranging from 2.678 (8)Å to
2.976 (7)Å (Table 1), thus resulting in the formation of
cation–anion–cation slab-sandwich layers with an arrangement of the cations
held together by close C–H···π(aryl) interactions in a herring bone motif
(Fig.2).
For related structure, see: Shan & Huang (2001).
Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2001); software used to prepare material for publication: SHELXTL.
(
R)-1-Phenylethylaminium
µ-oxalato-
κ4O,
O':
O''
O'''-bis[diaqua(oxalato-
κ2O,
O')cobalt(II)]
top
Crystal data top
(C8H12N)2[Co2(C2O4)3(H2O)4] | F(000) = 720 |
Mr = 698.36 | Dx = 1.639 Mg m−3 |
Monoclinic, C2 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: C 2y | Cell parameters from 4453 reflections |
a = 10.973 (2) Å | θ = 1.2–27.1° |
b = 7.5560 (15) Å | µ = 1.25 mm−1 |
c = 17.067 (3) Å | T = 296 K |
β = 90.33 (3)° | Plate, pink |
V = 1415.0 (5) Å3 | 0.24 × 0.12 × 0.04 mm |
Z = 2 | |
Data collection top
Siemens Quantum CCD diffractometer | 1938 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.020 |
Graphite monochromator | θmax = 25.5°, θmin = 1.2° |
ω scans | h = −13→10 |
3658 measured reflections | k = −9→8 |
2268 independent reflections | l = −20→19 |
Refinement top
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)] = 0.033 | H-atom parameters constrained |
wR(F2) = 0.102 | w = 1/[σ2(Fo2) + (0.0589P)2] where P = (Fo2 + 2Fc2)/3 |
S = 1.13 | (Δ/σ)max < 0.001 |
2268 reflections | Δρmax = 0.45 e Å−3 |
193 parameters | Δρmin = −0.52 e Å−3 |
38 restraints | Absolute structure: Flack (1983), 850 Fridel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: 0.11 (3) |
Crystal data top
(C8H12N)2[Co2(C2O4)3(H2O)4] | V = 1415.0 (5) Å3 |
Mr = 698.36 | Z = 2 |
Monoclinic, C2 | Mo Kα radiation |
a = 10.973 (2) Å | µ = 1.25 mm−1 |
b = 7.5560 (15) Å | T = 296 K |
c = 17.067 (3) Å | 0.24 × 0.12 × 0.04 mm |
β = 90.33 (3)° | |
Data collection top
Siemens Quantum CCD diffractometer | 1938 reflections with I > 2σ(I) |
3658 measured reflections | Rint = 0.020 |
2268 independent reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.033 | H-atom parameters constrained |
wR(F2) = 0.102 | Δρmax = 0.45 e Å−3 |
S = 1.13 | Δρmin = −0.52 e Å−3 |
2268 reflections | Absolute structure: Flack (1983), 850 Fridel pairs |
193 parameters | Absolute structure parameter: 0.11 (3) |
38 restraints | |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Co | 0.29291 (4) | 0.98018 (18) | 0.41036 (3) | 0.02253 (17) | |
O1 | 0.4159 (6) | 0.8027 (5) | 0.4631 (3) | 0.0242 (13) | |
O2 | 0.4163 (5) | 1.1583 (6) | 0.4624 (3) | 0.0266 (13) | |
O3 | 0.1732 (5) | 1.1586 (6) | 0.3606 (3) | 0.0262 (14) | |
O4 | 0.1735 (6) | 0.8017 (6) | 0.3563 (3) | 0.0286 (15) | |
O5 | −0.0023 (6) | 0.8057 (7) | 0.2907 (3) | 0.0379 (16) | |
O6 | −0.0019 (5) | 1.1607 (6) | 0.2925 (3) | 0.0341 (15) | |
O7 | 0.3966 (2) | 0.9858 (9) | 0.30858 (15) | 0.0317 (6) | |
H7A | 0.4480 | 0.8882 | 0.2992 | 0.038* | |
H7B | 0.4491 | 1.0760 | 0.3010 | 0.038* | |
O8 | 0.1915 (2) | 0.9809 (10) | 0.51531 (15) | 0.0314 (6) | |
H8A | 0.1465 | 1.0892 | 0.5220 | 0.038* | |
H8B | 0.1487 | 0.8760 | 0.5244 | 0.038* | |
N1 | 0.2561 (3) | 0.4834 (10) | 0.28541 (18) | 0.0278 (7) | |
H1A | 0.3371 | 0.4822 | 0.2833 | 0.042* | |
H1B | 0.2306 | 0.3950 | 0.3156 | 0.042* | |
H1C | 0.2312 | 0.5860 | 0.3054 | 0.042* | |
C1 | 0.5000 | 0.8799 (16) | 0.5000 | 0.019 (2) | |
C2 | 0.5000 | 1.0861 (15) | 0.5000 | 0.021 (3) | |
C4 | 0.0833 (8) | 0.8815 (10) | 0.3241 (4) | 0.0194 (16) | |
C3 | 0.0844 (9) | 1.0873 (11) | 0.3269 (5) | 0.0275 (19) | |
C9 | 0.3493 (6) | 0.6631 (9) | 0.1348 (3) | 0.0599 (19) | |
H9 | 0.4134 | 0.5978 | 0.1560 | 0.072* | |
C8 | 0.3753 (9) | 0.8048 (11) | 0.0842 (4) | 0.081 (2) | |
H8 | 0.4553 | 0.8345 | 0.0722 | 0.098* | |
C7 | 0.2813 (10) | 0.8964 (11) | 0.0536 (5) | 0.086 (3) | |
H7 | 0.2975 | 0.9898 | 0.0198 | 0.103* | |
C6 | 0.1660 (9) | 0.8583 (11) | 0.0701 (4) | 0.083 (3) | |
H6 | 0.1033 | 0.9241 | 0.0477 | 0.100* | |
C5 | 0.1388 (7) | 0.7174 (10) | 0.1216 (4) | 0.067 (2) | |
H5 | 0.0582 | 0.6921 | 0.1337 | 0.080* | |
C10 | 0.2306 (8) | 0.6182 (9) | 0.1538 (4) | 0.0395 (18) | |
C11 | 0.2044 (4) | 0.4618 (12) | 0.2043 (2) | 0.0307 (12) | |
H11 | 0.1157 | 0.4517 | 0.2089 | 0.037* | |
C12 | 0.2513 (8) | 0.2897 (8) | 0.1688 (4) | 0.045 (2) | |
H12A | 0.2189 | 0.2763 | 0.1168 | 0.068* | |
H12B | 0.2258 | 0.1917 | 0.2005 | 0.068* | |
H12C | 0.3387 | 0.2928 | 0.1667 | 0.068* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Co | 0.0218 (3) | 0.0158 (3) | 0.0299 (3) | −0.0009 (6) | −0.00417 (19) | 0.0013 (6) |
O1 | 0.034 (3) | 0.010 (3) | 0.029 (3) | −0.001 (3) | −0.008 (3) | 0.003 (2) |
O2 | 0.018 (3) | 0.023 (3) | 0.039 (3) | 0.002 (3) | −0.006 (2) | 0.005 (3) |
O3 | 0.023 (3) | 0.018 (3) | 0.038 (3) | −0.004 (2) | −0.007 (3) | 0.002 (2) |
O4 | 0.033 (4) | 0.016 (3) | 0.037 (3) | −0.001 (3) | −0.007 (3) | −0.001 (2) |
O5 | 0.038 (4) | 0.031 (4) | 0.044 (3) | −0.004 (3) | −0.020 (3) | 0.005 (3) |
O6 | 0.032 (4) | 0.021 (3) | 0.050 (3) | 0.010 (3) | −0.006 (3) | 0.000 (3) |
O7 | 0.0339 (13) | 0.0203 (14) | 0.0412 (15) | −0.001 (3) | 0.0077 (11) | 0.007 (3) |
O8 | 0.0361 (13) | 0.0150 (12) | 0.0432 (15) | −0.001 (3) | 0.0063 (11) | −0.002 (3) |
N1 | 0.0297 (15) | 0.0213 (15) | 0.0323 (16) | −0.002 (4) | 0.0005 (13) | 0.003 (4) |
C1 | 0.011 (5) | 0.029 (5) | 0.017 (4) | 0.000 | −0.001 (4) | 0.000 |
C2 | 0.030 (6) | 0.005 (4) | 0.029 (5) | 0.000 | 0.004 (5) | 0.000 |
C4 | 0.014 (4) | 0.024 (4) | 0.019 (4) | 0.001 (3) | −0.002 (3) | 0.000 (3) |
C3 | 0.039 (5) | 0.015 (3) | 0.029 (4) | 0.004 (4) | 0.002 (4) | −0.001 (3) |
C9 | 0.073 (5) | 0.070 (5) | 0.037 (3) | −0.032 (4) | 0.000 (3) | 0.005 (3) |
C8 | 0.109 (6) | 0.082 (5) | 0.053 (4) | −0.043 (5) | 0.008 (4) | 0.003 (4) |
C7 | 0.149 (7) | 0.053 (4) | 0.056 (4) | −0.010 (5) | 0.007 (5) | −0.001 (3) |
C6 | 0.132 (7) | 0.062 (4) | 0.056 (4) | 0.045 (5) | −0.011 (5) | 0.010 (4) |
C5 | 0.086 (5) | 0.064 (4) | 0.050 (4) | 0.038 (4) | −0.003 (4) | 0.009 (4) |
C10 | 0.055 (4) | 0.031 (4) | 0.033 (3) | −0.003 (3) | −0.007 (3) | −0.008 (3) |
C11 | 0.0267 (18) | 0.032 (4) | 0.034 (2) | −0.005 (3) | −0.0019 (16) | 0.001 (3) |
C12 | 0.076 (5) | 0.027 (4) | 0.033 (4) | 0.002 (4) | −0.003 (4) | −0.010 (3) |
Geometric parameters (Å, º) top
Co—O3 | 2.062 (5) | C1—C2 | 1.558 (6) |
Co—O7 | 2.083 (3) | C2—O2i | 1.243 (7) |
Co—O4 | 2.091 (5) | C4—C3 | 1.556 (5) |
Co—O1 | 2.102 (5) | C9—C10 | 1.387 (10) |
Co—O2 | 2.103 (6) | C9—C8 | 1.406 (10) |
Co—O8 | 2.114 (3) | C9—H9 | 0.9300 |
O1—C1 | 1.257 (8) | C8—C7 | 1.345 (12) |
O2—C2 | 1.243 (7) | C8—H8 | 0.9300 |
O3—C3 | 1.250 (10) | C7—C6 | 1.329 (12) |
O4—C4 | 1.281 (9) | C7—H7 | 0.9300 |
O5—C4 | 1.237 (9) | C6—C5 | 1.414 (11) |
O6—C3 | 1.242 (10) | C6—H6 | 0.9300 |
O7—H7A | 0.9420 | C5—C10 | 1.368 (10) |
O7—H7B | 0.9020 | C5—H5 | 0.9300 |
O8—H8A | 0.9630 | C10—C11 | 1.491 (11) |
O8—H8B | 0.9349 | C11—C12 | 1.525 (11) |
N1—C11 | 1.503 (5) | C11—H11 | 0.9800 |
N1—H1A | 0.8900 | C12—H12A | 0.9600 |
N1—H1B | 0.8900 | C12—H12B | 0.9600 |
N1—H1C | 0.8900 | C12—H12C | 0.9600 |
C1—O1i | 1.257 (8) | | |
| | | |
O3—Co—O7 | 89.6 (2) | O5—C4—O4 | 124.3 (8) |
O3—Co—O4 | 81.01 (9) | O5—C4—C3 | 118.9 (9) |
O7—Co—O4 | 89.4 (2) | O4—C4—C3 | 116.8 (9) |
O3—Co—O1 | 178.7 (2) | O6—C3—O3 | 128.0 (8) |
O7—Co—O1 | 91.0 (2) | O6—C3—C4 | 115.2 (9) |
O4—Co—O1 | 100.2 (2) | O3—C3—C4 | 116.8 (9) |
O3—Co—O2 | 99.4 (2) | C10—C9—C8 | 121.6 (8) |
O7—Co—O2 | 89.2 (2) | C10—C9—H9 | 119.2 |
O4—Co—O2 | 178.5 (3) | C8—C9—H9 | 119.2 |
O1—Co—O2 | 79.45 (9) | C7—C8—C9 | 118.2 (8) |
O3—Co—O8 | 90.6 (2) | C7—C8—H8 | 120.9 |
O7—Co—O8 | 178.1 (2) | C9—C8—H8 | 120.9 |
O4—Co—O8 | 92.5 (2) | C6—C7—C8 | 122.4 (8) |
O1—Co—O8 | 88.7 (2) | C6—C7—H7 | 118.8 |
O2—Co—O8 | 88.9 (2) | C8—C7—H7 | 118.8 |
C1—O1—Co | 112.7 (6) | C7—C6—C5 | 119.9 (8) |
C2—O2—Co | 114.2 (6) | C7—C6—H6 | 120.0 |
C3—O3—Co | 113.6 (5) | C5—C6—H6 | 120.0 |
C4—O4—Co | 111.5 (5) | C10—C5—C6 | 120.4 (8) |
Co—O7—H7A | 117.1 | C10—C5—H5 | 119.8 |
Co—O7—H7B | 119.1 | C6—C5—H5 | 119.8 |
H7A—O7—H7B | 100.6 | C5—C10—C9 | 117.5 (7) |
Co—O8—H8A | 112.0 | C5—C10—C11 | 121.5 (7) |
Co—O8—H8B | 113.9 | C9—C10—C11 | 120.9 (7) |
H8A—O8—H8B | 116.2 | C10—C11—N1 | 111.9 (6) |
C11—N1—H1A | 109.5 | C10—C11—C12 | 112.3 (4) |
C11—N1—H1B | 109.5 | N1—C11—C12 | 109.4 (6) |
H1A—N1—H1B | 109.5 | C10—C11—H11 | 107.7 |
C11—N1—H1C | 109.5 | N1—C11—H11 | 107.7 |
H1A—N1—H1C | 109.5 | C12—C11—H11 | 107.7 |
H1B—N1—H1C | 109.5 | C11—C12—H12A | 109.5 |
O1—C1—O1i | 124.7 (12) | C11—C12—H12B | 109.5 |
O1—C1—C2 | 117.6 (6) | H12A—C12—H12B | 109.5 |
O1i—C1—C2 | 117.6 (6) | C11—C12—H12C | 109.5 |
O2i—C2—O2 | 128.0 (12) | H12A—C12—H12C | 109.5 |
O2i—C2—C1 | 116.0 (6) | H12B—C12—H12C | 109.5 |
O2—C2—C1 | 116.0 (6) | | |
Symmetry code: (i) −x+1, y, −z+1. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1C···O4 | 0.89 | 1.95 | 2.843 (8) | 176 |
N1—H1B···O3ii | 0.89 | 2.05 | 2.918 (8) | 166 |
N1—H1A···O6iii | 0.89 | 2.23 | 2.976 (7) | 141 |
N1—H1A···O5iii | 0.89 | 2.21 | 2.973 (7) | 143 |
O8—H8B···O2iv | 0.93 | 1.81 | 2.737 (9) | 172 |
O8—H8A···O1v | 0.96 | 1.77 | 2.728 (9) | 172 |
O7—H7B···O5vi | 0.90 | 1.82 | 2.678 (8) | 157 |
O7—H7A···O6iii | 0.94 | 1.81 | 2.712 (8) | 159 |
Symmetry codes: (ii) x, y−1, z; (iii) x+1/2, y−1/2, z; (iv) −x+1/2, y−1/2, −z+1; (v) −x+1/2, y+1/2, −z+1; (vi) x+1/2, y+1/2, z. |
Experimental details
Crystal data |
Chemical formula | (C8H12N)2[Co2(C2O4)3(H2O)4] |
Mr | 698.36 |
Crystal system, space group | Monoclinic, C2 |
Temperature (K) | 296 |
a, b, c (Å) | 10.973 (2), 7.5560 (15), 17.067 (3) |
β (°) | 90.33 (3) |
V (Å3) | 1415.0 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 1.25 |
Crystal size (mm) | 0.24 × 0.12 × 0.04 |
|
Data collection |
Diffractometer | Siemens Quantum CCD |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3658, 2268, 1938 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.606 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.102, 1.13 |
No. of reflections | 2268 |
No. of parameters | 193 |
No. of restraints | 38 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.45, −0.52 |
Absolute structure | Flack (1983), 850 Fridel pairs |
Absolute structure parameter | 0.11 (3) |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1C···O4 | 0.89 | 1.95 | 2.843 (8) | 176 |
N1—H1B···O3i | 0.89 | 2.05 | 2.918 (8) | 166 |
N1—H1A···O6ii | 0.89 | 2.23 | 2.976 (7) | 141 |
N1—H1A···O5ii | 0.89 | 2.21 | 2.973 (7) | 143 |
O8—H8B···O2iii | 0.93 | 1.81 | 2.737 (9) | 172 |
O8—H8A···O1iv | 0.96 | 1.77 | 2.728 (9) | 172 |
O7—H7B···O5v | 0.90 | 1.82 | 2.678 (8) | 157 |
O7—H7A···O6ii | 0.94 | 1.81 | 2.712 (8) | 159 |
Symmetry codes: (i) x, y−1, z; (ii) x+1/2, y−1/2, z; (iii) −x+1/2, y−1/2, −z+1; (iv) −x+1/2, y+1/2, −z+1; (v) x+1/2, y+1/2, z. |
Subscribe to Acta Crystallographica Section E: Crystallographic Communications
The full text of this article is available to subscribers to the journal.
If you have already registered and are using a computer listed in your registration details, please email
support@iucr.org for assistance.
The crystal structure of the title compound, (I)(Fig. 1), consists of bicobalt oxalate complex anions [Co2(C2O4)3(H2O)4]2- and organic cations (C8H12N)+, joined into a two-dimensional sheet by hydrogen bonds. Owing to the presence of the chiral organic cation, the compound crystallizes in the polar space group C2. In the anion, there are two types of oxalates. One as tetradentate ligand bridges two Co atoms, each is coordinated by another type of oxalate as bidentate ligand in the same plane. Each Co atom is also bonded by two water molecules above and below the equatorial plane to produce a negative step-lamella. The bond angles around the Co atom range from 81.01 (9)° to 100.2 (2) °, and from 178.1 (2)° to 178.7 (2)°. The Co—O distances span from 2.062 (5)Å to 2.114 (3) Å. The organic cation contains a stereogenic center in its R configuration and has a normal structure similar to that described elsewhere (Shan & Huang, 2001). The cations are anchored in the pockets on the both faces of the puckered anionic lamella through hydrogen bonds with the distances ranging from 2.678 (8)Å to 2.976 (7)Å (Table 1), thus resulting in the formation of cation–anion–cation slab-sandwich layers with an arrangement of the cations held together by close C–H···π(aryl) interactions in a herring bone motif (Fig.2).