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Acta Cryst. (2007). E63, m1555-m1556    [ doi:10.1107/S1600536807020818 ]

Poly[triaquabis([mu]-benzene-1,2,4-tricarboxylato)zinc(II)dipotassium(I)]

Y.-H. Liu and H.-T. Chung

Abstract top

In the crystal structure of the title metal-organic coordination polymer, [K2Zn(C9H4O6)2(H2O)3]n, the ZnII ion exists in a tetrahedral coordination environment formed by four monodentate carboxylate O atoms. There are two crystallographically distinct KI ions. Each is coordinated by one terminal water molecule and four carboxylate O atoms; in addition, these two KI ions share one bridging water molecule. Thus, both KI ions present a distorted octahedral coordination environment. Two crystallographically independent benzene-1,2,4-tricarboxylate dianions act as three-connected pillars to give a heterometallic three-dimensional layer-pillared network structure.

Comment top

Polycarboxylic acids such as 1,4-benzenedicarboxylic acid and 1,3,5-benzenetricarboxylic acid are recognized as efficient O donors exhibiting versatile coordination modes and hydrogen bonding interaction toward the assembly of metal-organic coordination polymers (Yaghi et al., 2003; Rao et al., 2004). Here we report the synthesis and structure of the title heterometallic coordination polymer, (I), on the basis of a unsymmetrical bridging ligand, benzene-1,2,4-tricarboxylic acid (H3btc).

The asymmetric unit of (I) (Fig. 1) consists of two partially deprotonated Hbtc2- ligands, one ZnII atom, two K+ atoms, one bridging water molecule, and two coordinating water molecules with the formula of [K2Zn(Hbtc)2(H2O)3]n. Program PLATON/ADDSYM (Spek, 2003) confirms that compound (I) is crystallized in a triclinic crystal system with space group of P-1. For (I), partially deprotonated Hbtc2- ligands are observed. There are two crystallographically distinct Hbtc2- ligands. The assignment of the carboxyl hydrogen atoms from the difference Fourier map, and asymmetrical carbon–oxygen bond lengths (C9—O5 and C9—O6; C18—O11 and C18—O12) of the carboxyl groups are revealed from crystallographic results. On the other hand, more symmetrical carbon–oxygen bond distances that range from 1.232 to 1.284 Å are observed for the rest of the carboxylate groups of the Hbtc2– ligands. The ZnII exists in a tetrahedral coordination environment that is coordinated by four monodentate carboxylate oxygen atoms with Zn–O distances range from 1.985 to 2.038 Å. A close contacting distance of 2.482 (2) Å is observed between Zn1 and O4 carboxylate oxygen atom. There are two crystallographically distinct K atoms. Each K atom is coordinated by one coordinating water molecules, four carboxylate oxygen atoms, and these two K atoms share one bridging water molecule. Both of the K atoms present a distorted octahedral coordination environment. The ZnO4 and KO6 polyhedra are linked by carboxylate and carboxyl groups of Hbtc2- ligands as well as bridging water molecules to form a two dimensional layer network that lies parallel to the ab crystal plane (Fig. 2). The Hbtc2- ligands act as three-connected Pillars to give rise to a three-dimensional layer-pillared network structure (Fig. 3).

A solely ZnII based layer-pillared coordination polymer, [Zn2(Hbtc)2(H2O)3]n, which was crystallized in a monoclinic crystal system with higher space group symmetry of C2/c was previously reported (Qin et al., 2004). The distinct coordination environment between main group K atoms and transition metal Zn atoms results in diverse solid state packing of the layer-pillared coordination networks.

Related literature top

A solely ZnII-based layer-pillared coordination polymer, [Zn2(C9H4O6)2(H2O)3]n, which crystallized in a monoclinic crystal system with space group symmetry of C2/c was previously reported (Qin et al., 2004).

For related literature, see: Rao et al. (2004); Spek (2003); Yaghi et al. (2003).

Experimental top

All reagents and solvents were used as obtained without further purification. ZnCl2 (1.5 mmol), H3btc (1.0 mmol) were dissolved in 10 ml of distilled water, and were added drop-wise of 4M KOH solution to the pH of 3.8. The mixture was sealed in a Teflon-lined stainless steel vessel and held at 383 K for 96 h. The vessel was gradually cooled to room temperature, and colorless crystals suitable for crystallographic analysis were obtained after 7 d.

Refinement top

The C-bound H atoms were placed in calculated positions (C—H = 0.95 A) and refined in the riding-model approximation with Uiso(H) = 1.2 Ueq(C). The H atoms of the water molecules and carboxyl groups were located in a difference Fourier map, and refined as riding model with O—H distances range from 0.81 to 0.85 Å, and with Uiso(H) = 1.5 Ueq(O). The carboxylate oxygen atom O8 is disordered over two positions; the occupancies of O8A and O8B refined to 0.65 (14) and 0.35 (14), respectively.

Computing details top

Data collection: COLLECT (Nonius, 2000); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: SCALEPACK and DENZO (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figures top
[Figure 1] Fig. 1. The asymmetric unit, expanded to show the complete coordination of the Zn and K atoms, with displacement ellipsoids drawn at the 50% probability level. (Symmetry codes: (i) x - 1, y, z; (ii) x, y - 1, z; (iii) x, y + 1, z; (iv) -x + 1, -y, -z; (v) x + 1, y, z; (vi) -x + 2, -y, -z + 1; (vii) x + 1, y + 1, z)
[Figure 2] Fig. 2. A single polymeric two-dimensional layer within (I), which lies parallel to the ab crystal plane.
[Figure 3] Fig. 3. Packing diagram illustrating the layer-pillared three-dimensional network of (I).
Poly[triaquabis(µ-benzene-1,2,4-tricarboxylato)zinc(II)dipotassium(I)] top
Crystal data top
[K2Zn(C9H4O6)2(H2O)3]Z = 2
Mr = 613.86F(000) = 620
Triclinic, P1Dx = 1.871 Mg m−3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 6.9626 (2) ÅCell parameters from 12853 reflections
b = 7.0317 (2) Åθ = 2.0–25.4°
c = 22.9019 (5) ŵ = 1.59 mm−1
α = 93.372 (1)°T = 200 K
β = 91.821 (1)°Block, colorless
γ = 102.932 (2)°0.24 × 0.16 × 0.14 mm
V = 1089.76 (5) Å3
Data collection top
Nonius KappaCCD
diffractometer		3966 independent reflections
Radiation source: fine-focus sealed tube3510 reflections with I > 2σ(I)
graphiteRint = 0.059
CCD rotation images, thick slices scansθmax = 25.3°, θmin = 2.6°
Absorption correction: multi-scan
(Blessing, 1995)		h = −8→8
Tmin = 0.697, Tmax = 0.792k = −8→8
14633 measured reflectionsl = −27→27
Refinement top
Refinement on F20 restraints
Least-squares matrix: fullH-atom parameters constrained
R[F2 > 2σ(F2)] = 0.032 w = 1/[σ2(Fo2) + (0.0676P)2 + 0.4828P]
where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.110(Δ/σ)max = 0.001
S = 1.10Δρmax = 0.57 e Å−3
3966 reflectionsΔρmin = −0.82 e Å−3
335 parameters
Crystal data top
[K2Zn(C9H4O6)2(H2O)3]γ = 102.932 (2)°
Mr = 613.86V = 1089.76 (5) Å3
Triclinic, P1Z = 2
a = 6.9626 (2) ÅMo Kα radiation
b = 7.0317 (2) ŵ = 1.59 mm−1
c = 22.9019 (5) ÅT = 200 K
α = 93.372 (1)°0.24 × 0.16 × 0.14 mm
β = 91.821 (1)°
Data collection top
Nonius KappaCCD
diffractometer		3966 independent reflections
Absorption correction: multi-scan
(Blessing, 1995)		3510 reflections with I > 2σ(I)
Tmin = 0.697, Tmax = 0.792Rint = 0.059
14633 measured reflectionsθmax = 25.3°
Refinement top
R[F2 > 2σ(F2)] = 0.032H-atom parameters constrained
wR(F2) = 0.110Δρmax = 0.57 e Å−3
S = 1.10Δρmin = −0.82 e Å−3
3966 reflectionsAbsolute structure: ?
335 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Zn10.27940 (4)−0.36692 (4)0.253459 (12)0.01718 (13)
K10.77901 (9)0.24823 (10)0.19488 (3)0.02317 (17)
K21.16808 (11)0.11542 (10)0.31443 (3)0.0338 (2)
O10.1876 (3)−0.2183 (3)0.18857 (8)0.0217 (4)
O20.4098 (3)0.0485 (3)0.22169 (8)0.0227 (4)
O30.1914 (3)0.3713 (3)0.20653 (8)0.0202 (4)
O40.4817 (3)0.5199 (3)0.17720 (9)0.0282 (5)
O50.2264 (4)−0.0941 (3)−0.08408 (9)0.0329 (5)
O60.1906 (3)−0.3381 (3)−0.02374 (9)0.0288 (5)
H6A0.1826−0.4072−0.05530.043*
O70.5338 (3)−0.2617 (3)0.30286 (8)0.0217 (4)
O8A0.376 (4)−0.532 (4)0.3400 (17)0.028 (4)0.65 (14)
O8B0.418 (9)−0.565 (7)0.3281 (18)0.028 (6)0.35 (14)
O90.8514 (4)−0.5486 (4)0.29773 (10)0.0434 (7)
O101.1090 (3)−0.2940 (3)0.31484 (9)0.0306 (5)
O111.0028 (3)−0.1760 (4)0.59028 (9)0.0373 (6)
O121.2497 (3)−0.2064 (3)0.53400 (9)0.0293 (5)
H12A1.3154−0.17940.5660.044*
O190.8485 (3)−0.0771 (3)0.23775 (10)0.0344 (5)
H19A0.746−0.14710.24870.052*
H19B0.9172−0.14740.22480.052*
O290.8373 (3)0.5706 (3)0.12087 (9)0.0328 (5)
H29A0.93230.65720.1360.049*
H29B0.73130.57710.13770.049*
O391.5575 (4)0.1191 (4)0.36191 (11)0.0464 (7)
H39A1.5960.20060.33850.07*
H39B1.55450.01130.34410.07*
C10.2774 (4)0.0367 (4)0.12477 (11)0.0170 (6)
C20.3064 (4)0.2379 (4)0.11950 (11)0.0170 (6)
C30.3075 (4)0.3100 (4)0.06403 (12)0.0225 (6)
H3A0.32810.44690.06040.027*
C40.2788 (4)0.1837 (4)0.01401 (12)0.0234 (6)
H4A0.27950.2339−0.02360.028*
C50.2490 (4)−0.0174 (4)0.01922 (11)0.0196 (6)
C60.2483 (4)−0.0891 (4)0.07450 (11)0.0185 (6)
H6B0.2277−0.2260.0780.022*
C70.2941 (4)−0.0466 (4)0.18321 (11)0.0171 (6)
C80.3316 (4)0.3842 (4)0.17159 (11)0.0182 (6)
C90.2214 (4)−0.1521 (5)−0.03494 (12)0.0226 (6)
C100.6679 (4)−0.3545 (4)0.39147 (12)0.0201 (6)
C110.8697 (4)−0.3471 (4)0.38576 (11)0.0180 (6)
C120.9984 (4)−0.2982 (4)0.43456 (11)0.0200 (6)
H12B1.1354−0.28970.43060.024*
C130.9280 (4)−0.2618 (4)0.48920 (12)0.0198 (6)
C140.7285 (4)−0.2712 (5)0.49488 (13)0.0261 (7)
H14A0.6803−0.24680.53230.031*
C150.5998 (4)−0.3157 (5)0.44640 (12)0.0258 (7)
H15A0.4636−0.320.45050.031*
C160.5225 (4)−0.3940 (4)0.33973 (12)0.0230 (6)
C170.9456 (4)−0.4033 (5)0.32786 (12)0.0231 (6)
C181.0629 (4)−0.2102 (4)0.54277 (12)0.0223 (6)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn10.0197 (2)0.0186 (2)0.01313 (19)0.00488 (14)−0.00094 (13)−0.00035 (13)
K10.0247 (3)0.0265 (4)0.0166 (3)0.0027 (3)0.0002 (2)−0.0008 (3)
K20.0454 (4)0.0258 (4)0.0249 (4)−0.0029 (3)0.0128 (3)−0.0056 (3)
O10.0278 (11)0.0211 (11)0.0161 (9)0.0049 (9)0.0005 (8)0.0037 (8)
O20.0265 (11)0.0255 (11)0.0151 (10)0.0045 (9)−0.0008 (8)−0.0001 (8)
O30.0225 (10)0.0214 (11)0.0169 (9)0.0055 (8)0.0049 (8)−0.0018 (8)
O40.0266 (11)0.0280 (12)0.0251 (11)−0.0024 (10)0.0027 (9)−0.0062 (9)
O50.0528 (14)0.0319 (13)0.0132 (10)0.0081 (11)0.0021 (9)0.0003 (9)
O60.0440 (13)0.0226 (12)0.0179 (10)0.0049 (10)0.0014 (9)−0.0043 (8)
O70.0226 (10)0.0261 (12)0.0161 (10)0.0043 (9)−0.0007 (8)0.0039 (8)
O8A0.027 (5)0.018 (4)0.036 (7)0.000 (3)−0.009 (5)0.001 (4)
O8B0.033 (10)0.022 (8)0.028 (7)0.002 (7)−0.003 (7)−0.002 (6)
O90.0389 (14)0.0559 (17)0.0301 (13)0.0070 (12)−0.0029 (10)−0.0245 (12)
O100.0401 (13)0.0324 (13)0.0203 (11)0.0089 (10)0.0122 (9)0.0018 (9)
O110.0357 (13)0.0602 (17)0.0169 (11)0.0150 (12)0.0005 (9)−0.0061 (10)
O120.0244 (11)0.0437 (14)0.0194 (10)0.0087 (10)−0.0036 (8)−0.0042 (9)
O190.0293 (12)0.0308 (13)0.0452 (14)0.0084 (10)0.0108 (10)0.0099 (11)
O290.0361 (13)0.0312 (13)0.0266 (11)0.0004 (10)0.0056 (9)−0.0089 (10)
O390.0659 (18)0.0344 (14)0.0400 (14)0.0210 (13)−0.0280 (13)−0.0098 (11)
C10.0155 (13)0.0198 (15)0.0160 (13)0.0043 (11)0.0023 (10)0.0011 (11)
C20.0148 (13)0.0207 (15)0.0156 (13)0.0040 (11)0.0023 (10)0.0005 (11)
C30.0290 (16)0.0197 (16)0.0199 (14)0.0073 (13)0.0022 (12)0.0031 (12)
C40.0298 (16)0.0277 (17)0.0142 (13)0.0091 (13)0.0011 (11)0.0049 (12)
C50.0194 (14)0.0229 (16)0.0149 (13)0.0024 (12)0.0008 (11)−0.0015 (11)
C60.0197 (14)0.0185 (15)0.0169 (13)0.0031 (11)0.0020 (11)0.0014 (11)
C70.0195 (14)0.0204 (15)0.0137 (13)0.0094 (12)0.0045 (11)−0.0011 (11)
C80.0216 (14)0.0196 (15)0.0143 (13)0.0073 (12)−0.0012 (11)0.0006 (11)
C90.0224 (15)0.0277 (17)0.0172 (14)0.0047 (13)0.0017 (11)−0.0001 (12)
C100.0236 (15)0.0196 (15)0.0167 (13)0.0043 (12)−0.0027 (11)0.0030 (11)
C110.0225 (14)0.0181 (15)0.0133 (13)0.0048 (12)0.0004 (10)0.0009 (10)
C120.0212 (14)0.0246 (16)0.0154 (13)0.0075 (12)0.0011 (11)0.0017 (11)
C130.0223 (14)0.0205 (15)0.0162 (13)0.0043 (12)−0.0001 (11)0.0008 (11)
C140.0258 (16)0.0369 (19)0.0163 (14)0.0082 (14)0.0057 (12)−0.0001 (12)
C150.0179 (14)0.0389 (19)0.0211 (15)0.0067 (13)0.0021 (11)0.0029 (13)
C160.0244 (15)0.0224 (16)0.0212 (15)0.0037 (13)−0.0032 (12)0.0011 (12)
C170.0261 (16)0.0297 (17)0.0161 (14)0.0129 (14)−0.0016 (12)−0.0015 (12)
C180.0281 (16)0.0232 (16)0.0168 (14)0.0084 (13)0.0012 (12)−0.0002 (11)
Geometric parameters (Å, °) top
Zn1—O12.0322 (19)O12—H12A0.8399
Zn1—O3i2.0343 (19)O19—H19A0.8262
Zn1—O4i2.482 (2)O19—H19B0.8125
Zn1—O72.0379 (19)O29—H29A0.8421
Zn1—O10ii1.985 (2)O29—H29B0.8527
K1—O22.746 (2)O39—H39A0.8147
K1—O3iii2.807 (2)O39—H39B0.835
K1—O5iv2.696 (2)C1—C61.390 (4)
K1—O9v2.655 (2)C1—C21.397 (4)
K1—O192.676 (2)C1—C71.504 (4)
K1—O292.874 (2)C2—C31.395 (4)
K2—O2iii2.833 (2)C2—C81.508 (4)
K2—O8Avi2.600 (19)C3—C41.388 (4)
K2—O8Bvi2.51 (2)C3—H3A0.95
K2—O102.816 (2)C4—C51.395 (4)
K2—O11vii2.577 (2)C4—H4A0.95
K2—O192.827 (2)C5—C61.390 (4)
K2—O392.883 (2)C5—C91.496 (4)
O1—C71.283 (3)C6—H6B0.95
O2—C71.232 (3)C10—C151.392 (4)
O3—C81.272 (3)C10—C111.405 (4)
O4—C81.245 (3)C10—C161.505 (4)
O5—C91.218 (4)C11—C121.387 (4)
O6—C91.319 (4)C11—C171.507 (4)
O6—H6A0.8401C12—C131.389 (4)
O7—C161.284 (3)C12—H12B0.95
O8A—C161.239 (14)C13—C141.386 (4)
O8B—C161.27 (3)C13—C181.497 (4)
O9—C171.240 (4)C14—C151.380 (4)
O10—C171.278 (4)C14—H14A0.95
O11—C181.208 (4)C15—H15A0.95
O12—C181.317 (4)
O10ii—Zn1—O197.31 (8)C1—C2—C8123.0 (2)
O10ii—Zn1—O3i119.28 (9)C4—C3—C2120.7 (3)
O1—Zn1—O3i92.78 (8)C4—C3—H3A119.7
O10ii—Zn1—O793.83 (9)C2—C3—H3A119.7
O1—Zn1—O7122.86 (8)C3—C4—C5119.7 (3)
O3i—Zn1—O7128.48 (8)C3—C4—H4A120.1
O9v—K1—O1993.43 (8)C5—C4—H4A120.1
O9v—K1—O5iv168.09 (8)C6—C5—C4119.6 (3)
O19—K1—O5iv91.36 (7)C6—C5—C9121.1 (3)
O9v—K1—O294.31 (7)C4—C5—C9119.3 (2)
O19—K1—O277.08 (7)C5—C6—C1121.0 (3)
O5iv—K1—O297.39 (7)C5—C6—H6B119.5
O9v—K1—O3iii74.95 (7)C1—C6—H6B119.5
O19—K1—O3iii82.82 (6)O2—C7—O1124.4 (2)
O5iv—K1—O3iii94.87 (7)O2—C7—C1119.4 (3)
O2—K1—O3iii156.63 (6)O1—C7—C1116.1 (2)
O9v—K1—O2998.37 (8)O4—C8—O3122.1 (3)
O19—K1—O29156.20 (7)O4—C8—C2119.5 (2)
O5iv—K1—O2973.45 (6)O3—C8—C2118.3 (2)
O2—K1—O29122.18 (6)O5—C9—O6124.1 (3)
O3iii—K1—O2980.42 (6)O5—C9—C5122.9 (3)
O11vii—K2—O8Avi83.8 (11)O6—C9—C5113.0 (2)
O11vii—K2—O1098.29 (7)C15—C10—C11119.3 (3)
O8Avi—K2—O10152.0 (5)C15—C10—C16118.3 (3)
O11vii—K2—O19102.72 (7)C11—C10—C16122.4 (2)
O8Avi—K2—O19138.6 (3)C12—C11—C10119.7 (2)
O10—K2—O1968.50 (7)C12—C11—C17119.7 (2)
O11vii—K2—O2iii170.71 (7)C10—C11—C17120.5 (2)
O8Avi—K2—O2iii92.8 (12)C11—C12—C13120.4 (3)
O10—K2—O2iii80.66 (6)C11—C12—H12B119.8
O19—K2—O2iii85.54 (6)C13—C12—H12B119.8
O11vii—K2—O3999.85 (7)C14—C13—C12119.9 (3)
O8Avi—K2—O3967.6 (6)C14—C13—C18118.5 (2)
O10—K2—O3984.58 (7)C12—C13—C18121.6 (3)
O19—K2—O39146.89 (7)C15—C14—C13120.2 (3)
O2iii—K2—O3970.88 (7)C15—C14—H14A119.9
C7—O1—Zn1115.32 (17)C13—C14—H14A119.9
C8—O3—Zn1v99.94 (17)C14—C15—C10120.5 (3)
C8—O4—Zn1v80.11 (16)C14—C15—H15A119.7
C9—O6—H6A109.5C10—C15—H15A119.7
C16—O7—Zn1100.78 (17)O8A—C16—O7121.6 (6)
C17—O10—Zn1iii124.00 (19)O8B—C16—O7121.3 (10)
K1—O19—K295.75 (8)O8A—C16—C10119.0 (9)
H19A—O19—H19B108.3O8B—C16—C10119.6 (14)
H29A—O29—H29B110.1O7—C16—C10117.9 (3)
H39A—O39—H39B105.4O9—C17—O10125.5 (3)
C6—C1—C2119.4 (2)O9—C17—C11119.6 (3)
C6—C1—C7118.8 (2)O10—C17—C11114.8 (3)
C2—C1—C7121.6 (2)O11—C18—O12123.2 (3)
C3—C2—C1119.7 (2)O11—C18—C13121.9 (3)
C3—C2—C8117.4 (2)O12—C18—C13114.9 (2)
Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (iii) x+1, y, z; (iv) −x+1, −y, −z; (v) x, y+1, z; (vi) x+1, y+1, z; (vii) −x+2, −y, −z+1.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O6—H6A···O29iv0.841.822.657 (3)176
O12—H12A···O39viii0.841.832.668 (3)176
O19—H19A···O70.832.022.805 (3)159
O19—H19B···O1iii0.812.222.986 (3)156
O29—H29A···O1vi0.842.102.903 (3)159
O29—H29B···O40.851.962.790 (3)165
O39—H39B···O7iii0.842.062.896 (3)177
Symmetry codes: (iv) −x+1, −y, −z; (viii) −x+3, −y, −z+1; (iii) x+1, y, z; (vi) x+1, y+1, z.
Table 1
Selected geometric parameters (Å) top
Zn1—O12.0322 (19)K1—O192.676 (2)
Zn1—O3i2.0343 (19)K1—O292.874 (2)
Zn1—O72.0379 (19)K2—O2iii2.833 (2)
Zn1—O10ii1.985 (2)K2—O8Avi2.600 (19)
K1—O22.746 (2)K2—O102.816 (2)
K1—O3iii2.807 (2)K2—O11vii2.577 (2)
K1—O5iv2.696 (2)K2—O192.827 (2)
K1—O9v2.655 (2)K2—O392.883 (2)
Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (iii) x+1, y, z; (iv) −x+1, −y, −z; (v) x, y+1, z; (vi) x+1, y+1, z; (vii) −x+2, −y, −z+1.
Table 2
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O6—H6A···O29iv0.841.822.657 (3)176
O12—H12A···O39viii0.841.832.668 (3)176
O19—H19A···O70.832.022.805 (3)159
O19—H19B···O1iii0.812.222.986 (3)156
O29—H29A···O1vi0.842.102.903 (3)159
O29—H29B···O40.851.962.790 (3)165
O39—H39B···O7iii0.842.062.896 (3)177
Symmetry codes: (iv) −x+1, −y, −z; (viii) −x+3, −y, −z+1; (iii) x+1, y, z; (vi) x+1, y+1, z.
Acknowledgements top

The authors thank the National Science Council and Fu Jen Catholic University, Taiwan, for financial support.

references
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