supplementary materials


Acta Cryst. (2009). E65, o1067    [ doi:10.1107/S1600536809013786 ]

5-Methoxy-2-[(2-morpholinoethyl)iminiomethyl]phenolate

N. Mohd Lair, H. Mohd Ali and S. W. Ng

Abstract top

Each of the two independent molecules of the title comound, C14H20N2O3, exists in the zwitterionic form as the imino N atoms are protonated. The =N-H unit forms an intramolecular hydrogen bond to the negatively charged O atom, and also a weaker intermolecular N-H...O bond, the latter resulting in inversion dimers.

Related literature top

For the structure of 2-(2-morpholinylethyliminimethyl)phenol, see: Petek et al. (2005).

Experimental top

2-Hydroxy-4-methoxybenzaldehyde (0.3 g, 2 mmol) and N-(2-aminoethyl)morpholine (0.26 g, 2 mmol) were heated in acidified ethanol (50 ml) for 8 h. The solvent was removed to give an oil; crystals appeared in the oil after several days.

Refinement top

H atoms were placed at calculated positions (C—H = 0.95–0.99 Å) and were treated as riding on their parent C atoms, with U(H) set to 1.2–1.5 times Ueq(C). The iminium H atoms were located in a difference Fourier map, and were refined with a distance restraint of N—H = 0.88 (1) Å; their temperature factors were refined.

Computing details top

Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2009).

Figures top
[Figure 1] Fig. 1. Thermal ellipsoid plot (Barbour, 2001) of the two independent molecules of C14H20N2O3 at the 70% probability level. H atoms are drawn as spheres of arbitrary radius.
5-Methoxy-2-[(2-morpholinoethyl)iminiomethyl]phenolate top
Crystal data top
C14H20N2O3Z = 4
Mr = 264.32F(000) = 568
Triclinic, P1Dx = 1.301 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 10.4022 (2) ÅCell parameters from 4712 reflections
b = 10.7340 (2) Åθ = 2.3–28.3°
c = 14.3497 (3) ŵ = 0.09 mm1
α = 83.523 (1)°T = 100 K
β = 74.810 (1)°Block, yellow
γ = 60.768 (1)°0.25 × 0.25 × 0.25 mm
V = 1349.13 (5) Å3
Data collection top
Bruker SMART APEX
diffractometer
4990 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.019
graphiteθmax = 27.5°, θmin = 1.5°
ω scansh = 1313
9402 measured reflectionsk = 1313
5948 independent reflectionsl = 1816
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.040Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.122H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.0696P)2 + 0.3249P]
where P = (Fo2 + 2Fc2)/3
5948 reflections(Δ/σ)max = 0.001
353 parametersΔρmax = 0.31 e Å3
2 restraintsΔρmin = 0.28 e Å3
Crystal data top
C14H20N2O3γ = 60.768 (1)°
Mr = 264.32V = 1349.13 (5) Å3
Triclinic, P1Z = 4
a = 10.4022 (2) ÅMo Kα radiation
b = 10.7340 (2) ŵ = 0.09 mm1
c = 14.3497 (3) ÅT = 100 K
α = 83.523 (1)°0.25 × 0.25 × 0.25 mm
β = 74.810 (1)°
Data collection top
Bruker SMART APEX
diffractometer
4990 reflections with I > 2σ(I)
9402 measured reflectionsRint = 0.019
5948 independent reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.040H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.122Δρmax = 0.31 e Å3
S = 1.04Δρmin = 0.28 e Å3
5948 reflectionsAbsolute structure: ?
353 parametersFlack parameter: ?
2 restraintsRogers parameter: ?
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
O10.98316 (10)0.43387 (9)0.41326 (7)0.0206 (2)
O20.96310 (10)0.15768 (9)0.18272 (6)0.0212 (2)
O30.38917 (12)0.92759 (12)0.95202 (8)0.0352 (3)
O41.50070 (10)0.11554 (10)0.55972 (7)0.0248 (2)
O51.47841 (10)0.36606 (9)0.80663 (6)0.0207 (2)
O60.93660 (11)0.37780 (10)0.02785 (6)0.0226 (2)
N10.77639 (12)0.49804 (11)0.57933 (8)0.0179 (2)
H10.8542 (15)0.5066 (19)0.5426 (11)0.039 (5)*
N20.60959 (11)0.75546 (11)0.78788 (7)0.0168 (2)
N31.23596 (12)0.09777 (11)0.46514 (8)0.0201 (2)
H31.3361 (10)0.0512 (16)0.4734 (12)0.034 (5)*
N41.02064 (11)0.24956 (10)0.21452 (7)0.0163 (2)
C10.91918 (13)0.37426 (12)0.38550 (9)0.0157 (2)
C20.98177 (13)0.29765 (12)0.29480 (9)0.0165 (2)
H21.07320.29090.25400.020*
C30.91073 (14)0.23419 (12)0.26664 (9)0.0165 (2)
C40.77322 (14)0.24178 (12)0.32475 (9)0.0178 (3)
H40.72490.19880.30320.021*
C50.71188 (13)0.31159 (12)0.41178 (9)0.0174 (2)
H50.62080.31580.45120.021*
C60.78113 (13)0.37826 (12)0.44499 (9)0.0157 (2)
C71.11022 (15)0.12990 (14)0.12544 (9)0.0226 (3)
H7A1.13820.06870.06990.034*
H7B1.18500.08170.16470.034*
H7C1.10800.22030.10260.034*
C80.72030 (14)0.43854 (12)0.53895 (9)0.0171 (2)
H80.63150.43570.57590.021*
C90.72088 (15)0.54438 (13)0.68036 (9)0.0193 (3)
H9A0.80660.50110.71220.023*
H9B0.64700.51150.71390.023*
C100.64529 (14)0.70646 (13)0.68841 (9)0.0180 (3)
H10A0.71360.74010.64600.022*
H10B0.55060.74890.66570.022*
C110.54085 (16)0.91155 (14)0.78853 (10)0.0248 (3)
H11A0.45220.95240.75950.030*
H11B0.61540.93990.74860.030*
C120.49055 (17)0.97165 (15)0.88980 (10)0.0297 (3)
H12A0.58070.93940.91610.036*
H12B0.43971.07720.88770.036*
C130.46395 (18)0.77580 (18)0.95435 (10)0.0333 (4)
H13A0.39650.74390.99980.040*
H13B0.55680.74150.97800.040*
C140.50611 (16)0.71168 (16)0.85489 (10)0.0271 (3)
H14A0.55580.60620.85840.032*
H14B0.41340.74460.83130.032*
C151.42646 (14)0.13723 (13)0.60736 (9)0.0178 (3)
C161.49985 (14)0.24612 (12)0.68219 (9)0.0176 (3)
H161.60690.30440.69590.021*
C171.41790 (14)0.26689 (12)0.73376 (9)0.0168 (2)
C181.25664 (14)0.18526 (13)0.71453 (9)0.0187 (3)
H181.20140.20310.74970.022*
C191.18346 (14)0.08089 (13)0.64448 (9)0.0184 (3)
H191.07620.02540.63180.022*
C201.26264 (14)0.05270 (12)0.59010 (9)0.0172 (2)
C211.64017 (15)0.44652 (14)0.83657 (10)0.0248 (3)
H21A1.66850.51430.88810.037*
H21B1.68070.49880.78150.037*
H21C1.68210.38150.86060.037*
C221.17933 (14)0.05782 (13)0.51997 (9)0.0185 (3)
H221.07230.10800.51160.022*
C231.14126 (15)0.21047 (13)0.39115 (9)0.0216 (3)
H23A1.03900.26910.40370.026*
H23B1.18660.27350.39350.026*
C241.12827 (14)0.14453 (12)0.29159 (9)0.0181 (3)
H24A1.09590.07210.29280.022*
H24B1.22950.09510.27690.022*
C251.07626 (14)0.34487 (13)0.19663 (9)0.0192 (3)
H25A1.09050.39810.25600.023*
H25B1.17580.28740.18020.023*
C260.96492 (15)0.44957 (13)0.11458 (9)0.0208 (3)
H26A1.00610.51050.10250.025*
H26B0.86820.51230.13350.025*
C270.88279 (15)0.28513 (14)0.04521 (9)0.0222 (3)
H27A0.78510.34250.06400.027*
H27B0.86470.23500.01500.027*
C280.99553 (15)0.17629 (13)0.12430 (9)0.0197 (3)
H28A1.09280.11710.10520.024*
H28B0.95620.11260.13410.024*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0209 (5)0.0253 (5)0.0202 (5)0.0151 (4)0.0019 (4)0.0037 (4)
O20.0215 (5)0.0235 (4)0.0180 (5)0.0106 (4)0.0018 (4)0.0062 (4)
O30.0228 (5)0.0519 (7)0.0277 (6)0.0175 (5)0.0070 (4)0.0198 (5)
O40.0196 (5)0.0286 (5)0.0258 (5)0.0094 (4)0.0061 (4)0.0070 (4)
O50.0196 (5)0.0214 (4)0.0209 (5)0.0100 (4)0.0010 (4)0.0069 (4)
O60.0290 (5)0.0254 (5)0.0166 (5)0.0158 (4)0.0034 (4)0.0028 (4)
N10.0177 (5)0.0197 (5)0.0152 (5)0.0093 (4)0.0004 (4)0.0020 (4)
N20.0167 (5)0.0195 (5)0.0132 (5)0.0089 (4)0.0008 (4)0.0013 (4)
N30.0181 (5)0.0199 (5)0.0174 (5)0.0061 (4)0.0012 (4)0.0033 (4)
N40.0173 (5)0.0173 (5)0.0141 (5)0.0087 (4)0.0014 (4)0.0028 (4)
C10.0158 (6)0.0148 (5)0.0162 (6)0.0071 (4)0.0045 (5)0.0014 (4)
C20.0153 (6)0.0170 (5)0.0158 (6)0.0074 (5)0.0022 (5)0.0007 (4)
C30.0174 (6)0.0140 (5)0.0151 (6)0.0047 (4)0.0048 (5)0.0003 (4)
C40.0172 (6)0.0178 (5)0.0216 (6)0.0095 (5)0.0074 (5)0.0008 (5)
C50.0142 (5)0.0172 (5)0.0194 (6)0.0072 (5)0.0037 (5)0.0027 (5)
C60.0144 (5)0.0149 (5)0.0160 (6)0.0060 (4)0.0031 (4)0.0008 (4)
C70.0221 (6)0.0224 (6)0.0182 (6)0.0087 (5)0.0009 (5)0.0033 (5)
C80.0146 (6)0.0164 (5)0.0180 (6)0.0066 (5)0.0022 (5)0.0011 (4)
C90.0224 (6)0.0213 (6)0.0139 (6)0.0115 (5)0.0012 (5)0.0015 (5)
C100.0171 (6)0.0209 (6)0.0139 (6)0.0079 (5)0.0021 (5)0.0015 (5)
C110.0258 (7)0.0208 (6)0.0200 (7)0.0048 (5)0.0047 (5)0.0034 (5)
C120.0300 (7)0.0288 (7)0.0245 (7)0.0109 (6)0.0001 (6)0.0090 (6)
C130.0389 (8)0.0540 (9)0.0177 (7)0.0346 (8)0.0055 (6)0.0074 (6)
C140.0290 (7)0.0415 (8)0.0183 (7)0.0251 (7)0.0019 (5)0.0056 (6)
C150.0190 (6)0.0188 (5)0.0159 (6)0.0099 (5)0.0034 (5)0.0011 (4)
C160.0146 (6)0.0178 (5)0.0189 (6)0.0073 (5)0.0021 (5)0.0004 (5)
C170.0199 (6)0.0151 (5)0.0150 (6)0.0093 (5)0.0014 (5)0.0001 (4)
C180.0187 (6)0.0213 (6)0.0191 (6)0.0110 (5)0.0063 (5)0.0013 (5)
C190.0158 (6)0.0184 (6)0.0187 (6)0.0071 (5)0.0037 (5)0.0029 (5)
C200.0176 (6)0.0170 (5)0.0152 (6)0.0078 (5)0.0026 (5)0.0013 (4)
C210.0208 (6)0.0220 (6)0.0275 (7)0.0086 (5)0.0008 (5)0.0084 (5)
C220.0176 (6)0.0188 (6)0.0170 (6)0.0080 (5)0.0031 (5)0.0026 (5)
C230.0216 (6)0.0195 (6)0.0188 (6)0.0061 (5)0.0023 (5)0.0051 (5)
C240.0168 (6)0.0170 (5)0.0183 (6)0.0055 (5)0.0044 (5)0.0038 (5)
C250.0199 (6)0.0207 (6)0.0185 (6)0.0115 (5)0.0021 (5)0.0024 (5)
C260.0253 (7)0.0204 (6)0.0187 (6)0.0127 (5)0.0035 (5)0.0028 (5)
C270.0242 (7)0.0271 (6)0.0183 (6)0.0158 (6)0.0016 (5)0.0017 (5)
C280.0237 (6)0.0206 (6)0.0178 (6)0.0128 (5)0.0048 (5)0.0000 (5)
Geometric parameters (Å, °) top
O1—C11.2741 (15)C10—H10B0.9900
O2—C31.3652 (14)C11—C121.5115 (18)
O2—C71.4342 (15)C11—H11A0.9900
O3—C131.423 (2)C11—H11B0.9900
O3—C121.4253 (18)C12—H12A0.9900
O4—C151.2673 (16)C12—H12B0.9900
O5—C171.3691 (14)C13—C141.5172 (18)
O5—C211.4308 (15)C13—H13A0.9900
O6—C271.4274 (15)C13—H13B0.9900
O6—C261.4291 (15)C14—H14A0.9900
N1—C81.3071 (16)C14—H14B0.9900
N1—C91.4581 (16)C15—C161.4436 (17)
N1—H10.883 (9)C15—C201.4518 (17)
N2—C111.4657 (16)C16—C171.3702 (18)
N2—C101.4673 (15)C16—H160.9500
N2—C141.4676 (16)C17—C181.4263 (17)
N3—C221.3097 (17)C18—C191.3657 (17)
N3—C231.4625 (15)C18—H180.9500
N3—H30.889 (9)C19—C201.4187 (18)
N4—C241.4654 (15)C19—H190.9500
N4—C281.4685 (16)C20—C221.4068 (17)
N4—C251.4706 (15)C21—H21A0.9800
C1—C21.4383 (16)C21—H21B0.9800
C1—C61.4486 (16)C21—H21C0.9800
C2—C31.3724 (17)C22—H220.9500
C2—H20.9500C23—C241.5246 (18)
C3—C41.4229 (17)C23—H23A0.9900
C4—C51.3619 (17)C23—H23B0.9900
C4—H40.9500C24—H24A0.9900
C5—C61.4207 (17)C24—H24B0.9900
C5—H50.9500C25—C261.5177 (17)
C6—C81.4096 (17)C25—H25A0.9900
C7—H7A0.9800C25—H25B0.9900
C7—H7B0.9800C26—H26A0.9900
C7—H7C0.9800C26—H26B0.9900
C8—H80.9500C27—C281.5138 (17)
C9—C101.5231 (16)C27—H27A0.9900
C9—H9A0.9900C27—H27B0.9900
C9—H9B0.9900C28—H28A0.9900
C10—H10A0.9900C28—H28B0.9900
C3—O2—C7117.10 (10)C14—C13—H13B109.4
C13—O3—C12108.59 (10)H13A—C13—H13B108.0
C17—O5—C21117.66 (10)N2—C14—C13109.57 (11)
C27—O6—C26109.87 (9)N2—C14—H14A109.8
C8—N1—C9123.55 (11)C13—C14—H14A109.8
C8—N1—H1116.5 (12)N2—C14—H14B109.8
C9—N1—H1119.9 (12)C13—C14—H14B109.8
C11—N2—C10108.28 (10)H14A—C14—H14B108.2
C11—N2—C14109.75 (10)O4—C15—C16122.00 (11)
C10—N2—C14112.35 (10)O4—C15—C20121.65 (11)
C22—N3—C23122.71 (11)C16—C15—C20116.34 (11)
C22—N3—H3116.9 (11)C17—C16—C15121.19 (11)
C23—N3—H3120.4 (11)C17—C16—H16119.4
C24—N4—C28109.97 (9)C15—C16—H16119.4
C24—N4—C25111.83 (9)O5—C17—C16124.99 (11)
C28—N4—C25108.10 (10)O5—C17—C18113.13 (11)
O1—C1—C2121.77 (11)C16—C17—C18121.87 (11)
O1—C1—C6121.36 (11)C19—C18—C17118.51 (11)
C2—C1—C6116.85 (11)C19—C18—H18120.7
C3—C2—C1120.63 (11)C17—C18—H18120.7
C3—C2—H2119.7C18—C19—C20122.08 (11)
C1—C2—H2119.7C18—C19—H19119.0
O2—C3—C2124.61 (11)C20—C19—H19119.0
O2—C3—C4113.45 (10)C22—C20—C19118.70 (11)
C2—C3—C4121.95 (11)C22—C20—C15121.32 (11)
C5—C4—C3119.04 (11)C19—C20—C15119.98 (11)
C5—C4—H4120.5O5—C21—H21A109.5
C3—C4—H4120.5O5—C21—H21B109.5
C4—C5—C6121.45 (11)H21A—C21—H21B109.5
C4—C5—H5119.3O5—C21—H21C109.5
C6—C5—H5119.3H21A—C21—H21C109.5
C8—C6—C5119.15 (11)H21B—C21—H21C109.5
C8—C6—C1120.63 (11)N3—C22—C20125.90 (12)
C5—C6—C1120.06 (11)N3—C22—H22117.1
O2—C7—H7A109.5C20—C22—H22117.1
O2—C7—H7B109.5N3—C23—C24109.88 (10)
H7A—C7—H7B109.5N3—C23—H23A109.7
O2—C7—H7C109.5C24—C23—H23A109.7
H7A—C7—H7C109.5N3—C23—H23B109.7
H7B—C7—H7C109.5C24—C23—H23B109.7
N1—C8—C6125.19 (11)H23A—C23—H23B108.2
N1—C8—H8117.4N4—C24—C23113.23 (10)
C6—C8—H8117.4N4—C24—H24A108.9
N1—C9—C10110.56 (10)C23—C24—H24A108.9
N1—C9—H9A109.5N4—C24—H24B108.9
C10—C9—H9A109.5C23—C24—H24B108.9
N1—C9—H9B109.5H24A—C24—H24B107.7
C10—C9—H9B109.5N4—C25—C26110.72 (10)
H9A—C9—H9B108.1N4—C25—H25A109.5
N2—C10—C9111.97 (10)C26—C25—H25A109.5
N2—C10—H10A109.2N4—C25—H25B109.5
C9—C10—H10A109.2C26—C25—H25B109.5
N2—C10—H10B109.2H25A—C25—H25B108.1
C9—C10—H10B109.2O6—C26—C25111.69 (10)
H10A—C10—H10B107.9O6—C26—H26A109.3
N2—C11—C12111.64 (11)C25—C26—H26A109.3
N2—C11—H11A109.3O6—C26—H26B109.3
C12—C11—H11A109.3C25—C26—H26B109.3
N2—C11—H11B109.3H26A—C26—H26B107.9
C12—C11—H11B109.3O6—C27—C28111.39 (10)
H11A—C11—H11B108.0O6—C27—H27A109.3
O3—C12—C11111.69 (12)C28—C27—H27A109.3
O3—C12—H12A109.3O6—C27—H27B109.3
C11—C12—H12A109.3C28—C27—H27B109.3
O3—C12—H12B109.3H27A—C27—H27B108.0
C11—C12—H12B109.3N4—C28—C27109.79 (10)
H12A—C12—H12B107.9N4—C28—H28A109.7
O3—C13—C14111.10 (13)C27—C28—H28A109.7
O3—C13—H13A109.4N4—C28—H28B109.7
C14—C13—H13A109.4C27—C28—H28B109.7
O3—C13—H13B109.4H28A—C28—H28B108.2
O1—C1—C2—C3179.90 (11)O4—C15—C16—C17179.19 (11)
C6—C1—C2—C31.07 (16)C20—C15—C16—C170.26 (17)
C7—O2—C3—C26.74 (17)C21—O5—C17—C165.24 (18)
C7—O2—C3—C4172.62 (10)C21—O5—C17—C18175.49 (10)
C1—C2—C3—O2178.94 (10)C15—C16—C17—O5179.04 (10)
C1—C2—C3—C40.37 (18)C15—C16—C17—C181.75 (19)
O2—C3—C4—C5178.02 (10)O5—C17—C18—C19178.74 (10)
C2—C3—C4—C51.36 (18)C16—C17—C18—C191.96 (18)
C3—C4—C5—C60.81 (17)C17—C18—C19—C200.67 (18)
C4—C5—C6—C8174.64 (11)C18—C19—C20—C22179.23 (11)
C4—C5—C6—C10.66 (17)C18—C19—C20—C150.77 (18)
O1—C1—C6—C85.18 (17)O4—C15—C20—C220.43 (19)
C2—C1—C6—C8173.65 (11)C16—C15—C20—C22179.02 (11)
O1—C1—C6—C5179.58 (11)O4—C15—C20—C19179.57 (11)
C2—C1—C6—C51.58 (16)C16—C15—C20—C190.98 (17)
C9—N1—C8—C6172.63 (11)C23—N3—C22—C20177.67 (11)
C5—C6—C8—N1177.35 (11)C19—C20—C22—N3179.06 (12)
C1—C6—C8—N12.07 (18)C15—C20—C22—N30.94 (19)
C8—N1—C9—C10112.86 (13)C22—N3—C23—C24102.47 (14)
C11—N2—C10—C9178.68 (11)C28—N4—C24—C23170.73 (10)
C14—N2—C10—C959.94 (14)C25—N4—C24—C2369.17 (13)
N1—C9—C10—N2171.02 (10)N3—C23—C24—N4173.15 (10)
C10—N2—C11—C12176.04 (11)C24—N4—C25—C26178.31 (10)
C14—N2—C11—C1253.07 (15)C28—N4—C25—C2657.12 (13)
C13—O3—C12—C1159.03 (15)C27—O6—C26—C2556.66 (13)
N2—C11—C12—O355.80 (16)N4—C25—C26—O657.23 (14)
C12—O3—C13—C1461.84 (15)C26—O6—C27—C2858.34 (13)
C11—N2—C14—C1354.87 (15)C24—N4—C28—C27179.29 (10)
C10—N2—C14—C13175.41 (11)C25—N4—C28—C2758.37 (13)
O3—C13—C14—N260.70 (16)O6—C27—C28—N460.28 (14)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N1—H1···O10.88 (1)1.96 (1)2.6489 (15)133 (2)
N1—H1···O1i0.88 (1)2.32 (1)2.9570 (18)129 (1)
N3—H3···O40.89 (1)2.02 (1)2.6930 (15)132 (1)
N3—H3···O4ii0.89 (1)2.29 (1)2.9505 (18)132 (1)
Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) −x+3, −y, −z−1.
Table 1
Hydrogen-bond geometry (Å, °)
top
D—H···AD—HH···AD···AD—H···A
N1—H1···O10.88 (1)1.96 (1)2.6489 (15)133 (2)
N1—H1···O1i0.88 (1)2.32 (1)2.9570 (18)129 (1)
N3—H3···O40.89 (1)2.02 (1)2.6930 (15)132 (1)
N3—H3···O4ii0.89 (1)2.29 (1)2.9505 (18)132 (1)
Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) −x+3, −y, −z−1.
Acknowledgements top

The authors thank the University of Malaya for supporting this study.

references
References top

Barbour, L. J. (2001). J. Supramol. Chem. 1, 189–191.

Bruker (2008). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.

Petek, H., Albayrak, C., İskeleli, N. O., Ağar, E. & Şenel, I. (2005). Acta Cryst. E61, o3990–o3991.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

Westrip, S. P. (2009). publCIF. In preparation.