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Acta Cryst. (2007). E63, m2941-m2942    [ doi:10.1107/S1600536807055237 ]

Decaaquabis[[mu]2-(5-carboxylato-m-phenylenedioxy)diacetato]trizinc(II) dihydrate

Y.-H. Wen, X. Feng and S. W. Ng

Abstract top

In the crystal structure of the title compound, [Zn3(C11H7O8)2(H2O)10]·2H2O, the trianionic carboxylate unit uses one oxyacetate -OCH2CO2- arm to chelate a Zn atom through the ether and carboxylate O atoms. The other oxyacetate arm is free; the -CO2- end has a formal negative charge. The central Zn atom lies on a special position of site symmetry \overline{1}. The uncoordinated water molecules form a three-dimensional hydrogen-bonded network. One solvent water molecule is disordered over two positions in a 2:1 ratio.

Related literature top

The reaction of zinc cations and (5-carboxylato-m-phenylenedioxy)diacetate trianions in water gives crystalline hexaaquazinc bis[[(5-carboxylato-m-phenylenedioxy)diacetato]triaquazincate] heptahydrate, whose anion exists as a carboxylate-bridged chain (Wen & Ng, 2007).

Experimental top

(5-Carboxy-m-phenylenedioxy)diacetic acid (0.282 g, 1 mol) and zinc nitrate hexahydrate (0.298 g, 1 mmol)) were mixed in 20 ml e thanol-water (1:1, v/v) solution. The pH value was adjusted to 7 by sodium carbonate solution. The filtered solution was set aside for the growth of crystals which appeared after a week.

In an earlier attempt, the filtered solution was set aside for a week for the growth of hexaaquazinc bis[(5-carboxylato-m-phenylenedioxy)diacetatotriaquazincate] heptahydrate (Wen & Ng, 2007). In the present study, the solution was kept at 278 K for two months to yield a compound of a different composition.

Refinement top

The water H-atoms were located in a difference Fourier map, and were refined with distance restraints of O–H 0.85 (1) Å and H···H 1.39 (1) Å); their temperature factors were freely refined. For the disordered lattce water molecule, hydrogen atoms were placed on the major component only. The carbon-bound H-atoms were generated geometrically (C–H 0.93 to 0.97 Å); they were included in the refinement in the riding model approximation, with U(H) set to 1.2Ueq(C).

Computing details top

Data collection: SMART (Bruker, 2006); cell refinement: SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2007).

Figures top
[Figure 1] Fig. 1. Thermal ellipsoid plot depicting the coordination geometries of the two zinc atoms; displacement ellipsoids are drawn at the 70% probability level, and H atoms as spheres of arbitrary radius. The minor disorder component of the lattice water molecule is not shown. [Symmery code (i) 2 – x, –y, 1 – z.]
Decaaquabis[µ2-(5-carboxylato-m-phenylenedioxy)diacetato]trizinc(II) dihydrate top
Crystal data top
[Zn3(C11H7O8)2(H2O)10]·2H2OZ = 1
Mr = 946.63F(000) = 484
Triclinic, P1Dx = 1.866 Mg m−3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 7.3125 (1) ÅCell parameters from 5082 reflections
b = 9.0935 (1) Åθ = 2.6–27.2°
c = 13.4543 (2) ŵ = 2.23 mm−1
α = 79.271 (1)°T = 295 K
β = 82.6340 (1)°Prism, colorless
γ = 74.064 (1)°0.32 × 0.16 × 0.06 mm
V = 842.42 (2) Å3
Data collection top
Bruker APEX-II area-detector
diffractometer		3858 independent reflections
Radiation source: fine-focus sealed tube3176 reflections with I > 2σ(I)
graphiteRint = 0.027
φ and ω scansθmax = 27.5°, θmin = 1.6°
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		h = −9→9
Tmin = 0.742, Tmax = 0.878k = −11→11
14462 measured reflectionsl = −16→17
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)] = 0.027Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.067H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.032P)2 + 0.2695P]
where P = (Fo2 + 2Fc2)/3
3858 reflections(Δ/σ)max = 0.001
299 parametersΔρmax = 0.42 e Å−3
18 restraintsΔρmin = −0.29 e Å−3
Crystal data top
[Zn3(C11H7O8)2(H2O)10]·2H2Oγ = 74.064 (1)°
Mr = 946.63V = 842.42 (2) Å3
Triclinic, P1Z = 1
a = 7.3125 (1) ÅMo Kα radiation
b = 9.0935 (1) ŵ = 2.23 mm−1
c = 13.4543 (2) ÅT = 295 K
α = 79.271 (1)°0.32 × 0.16 × 0.06 mm
β = 82.6340 (1)°
Data collection top
Bruker APEX-II area-detector
diffractometer		3858 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		3176 reflections with I > 2σ(I)
Tmin = 0.742, Tmax = 0.878Rint = 0.027
14462 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.027H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.067Δρmax = 0.42 e Å−3
S = 1.04Δρmin = −0.29 e Å−3
3858 reflectionsAbsolute structure: ?
299 parametersFlack parameter: ?
18 restraintsRogers parameter: ?
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Zn11.00000.00000.50000.02497 (9)
Zn20.25698 (3)0.73433 (3)0.898344 (17)0.02466 (8)
O10.9264 (2)−0.15104 (16)0.61275 (10)0.0281 (3)
O20.7610 (2)−0.19883 (17)0.75921 (11)0.0298 (3)
O30.7885 (2)0.15379 (15)0.60092 (10)0.0262 (3)
O40.4623 (2)0.54817 (17)0.84086 (10)0.0281 (3)
O50.3464 (2)0.75350 (16)0.73226 (11)0.0281 (3)
O60.7776 (2)0.65455 (16)0.41363 (10)0.0270 (3)
O70.8774 (3)0.83786 (18)0.25159 (12)0.0449 (5)
O80.9369 (2)0.65423 (17)0.15490 (11)0.0310 (4)
O1w0.7706 (2)−0.00283 (19)0.42077 (12)0.0326 (4)
H1w10.741 (4)0.0793 (17)0.3784 (17)0.069 (10)*
H1w20.794 (5)−0.0807 (19)0.3909 (19)0.080 (12)*
O2w0.0493 (2)0.94000 (19)0.89410 (14)0.0400 (4)
H2w10.066 (4)1.016 (2)0.8510 (17)0.062 (9)*
H2w2−0.061 (2)0.957 (3)0.922 (2)0.083 (12)*
O3w0.0360 (2)0.63529 (19)0.89035 (13)0.0331 (4)
H3w10.059 (3)0.5422 (12)0.8821 (18)0.044 (8)*
H3w2−0.042 (4)0.693 (2)0.8485 (19)0.070 (10)*
O4w0.2654 (3)0.6729 (2)1.05019 (12)0.0404 (4)
H4w10.355 (3)0.603 (3)1.079 (2)0.073 (10)*
H4w20.1602 (19)0.667 (3)1.0834 (18)0.054 (9)*
O5w0.4649 (2)0.8552 (2)0.89952 (12)0.0313 (4)
H5w10.550 (3)0.847 (3)0.8501 (12)0.047 (8)*
H5w20.520 (4)0.837 (4)0.9540 (11)0.090 (13)*
O6w−0.2748 (4)0.8784 (3)1.0180 (2)0.0378 (10)0.671 (6)
H6w1−0.223 (6)0.793 (3)1.054 (3)0.126 (17)*
H6w2−0.338 (7)0.941 (4)1.058 (3)0.17 (2)*
O6w'−0.4015 (10)0.8303 (8)1.0841 (6)0.062 (3)0.329 (6)
C10.8089 (3)−0.1096 (2)0.68481 (15)0.0223 (4)
C20.7164 (3)0.0612 (2)0.68664 (16)0.0297 (5)
H2A0.57930.08110.68590.036*
H2B0.74220.08920.74860.036*
C30.7317 (3)0.3135 (2)0.59859 (14)0.0204 (4)
C40.6293 (3)0.3834 (2)0.67841 (15)0.0220 (4)
H40.59720.32430.73890.026*
C50.5750 (3)0.5446 (2)0.66633 (15)0.0205 (4)
C60.6244 (3)0.6330 (2)0.57711 (14)0.0215 (4)
H60.58640.74050.56930.026*
C70.7317 (3)0.5591 (2)0.49913 (14)0.0210 (4)
C80.7852 (3)0.3998 (2)0.50908 (15)0.0219 (4)
H80.85620.35100.45640.026*
C90.4563 (3)0.6204 (2)0.75028 (14)0.0207 (4)
C100.8699 (3)0.5819 (2)0.32888 (15)0.0229 (4)
H10A0.79410.51900.31200.027*
H10B0.99370.51470.34580.027*
C110.8944 (3)0.7035 (2)0.23948 (15)0.0252 (4)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn10.0323 (2)0.01893 (18)0.02016 (18)−0.00585 (14)0.00617 (14)−0.00096 (13)
Zn20.02595 (14)0.02400 (14)0.02075 (13)−0.00288 (10)0.00454 (10)−0.00511 (10)
O10.0366 (9)0.0184 (7)0.0240 (8)−0.0050 (6)0.0098 (6)−0.0014 (6)
O20.0328 (9)0.0246 (8)0.0268 (8)−0.0082 (7)0.0064 (6)0.0040 (6)
O30.0374 (9)0.0147 (7)0.0220 (7)−0.0049 (6)0.0101 (6)−0.0030 (6)
O40.0319 (8)0.0261 (8)0.0195 (7)0.0005 (6)0.0040 (6)−0.0029 (6)
O50.0313 (8)0.0226 (8)0.0239 (8)0.0038 (6)0.0003 (6)−0.0055 (6)
O60.0405 (9)0.0179 (7)0.0188 (7)−0.0066 (6)0.0097 (6)−0.0032 (6)
O70.0838 (14)0.0222 (8)0.0266 (8)−0.0166 (9)0.0076 (9)−0.0024 (7)
O80.0445 (10)0.0279 (8)0.0183 (7)−0.0088 (7)0.0053 (7)−0.0042 (6)
O1w0.0403 (10)0.0250 (9)0.0313 (9)−0.0059 (7)−0.0043 (7)−0.0042 (7)
O2w0.0313 (10)0.0245 (9)0.0532 (11)−0.0030 (7)0.0090 (8)0.0067 (8)
O3w0.0348 (9)0.0224 (8)0.0419 (10)−0.0070 (7)−0.0044 (8)−0.0042 (7)
O4w0.0290 (9)0.0576 (12)0.0245 (8)−0.0037 (9)0.0030 (7)0.0043 (8)
O5w0.0289 (9)0.0415 (10)0.0262 (8)−0.0127 (7)0.0045 (7)−0.0112 (7)
O6w0.0391 (17)0.0333 (16)0.0384 (17)0.0018 (12)−0.0112 (13)−0.0101 (13)
O6w'0.065 (5)0.049 (4)0.074 (5)0.001 (3)−0.031 (4)−0.018 (4)
C10.0242 (11)0.0210 (10)0.0212 (10)−0.0068 (8)−0.0014 (8)−0.0011 (8)
C20.0355 (13)0.0222 (11)0.0262 (11)−0.0072 (9)0.0113 (9)−0.0011 (9)
C30.0224 (10)0.0157 (9)0.0213 (10)−0.0019 (8)0.0000 (8)−0.0042 (8)
C40.0246 (10)0.0206 (10)0.0181 (10)−0.0049 (8)0.0030 (8)−0.0010 (8)
C50.0207 (10)0.0199 (10)0.0199 (10)−0.0024 (8)−0.0008 (8)−0.0059 (8)
C60.0246 (10)0.0168 (10)0.0217 (10)−0.0027 (8)−0.0005 (8)−0.0042 (8)
C70.0237 (10)0.0205 (10)0.0178 (10)−0.0061 (8)0.0013 (8)−0.0019 (8)
C80.0248 (10)0.0209 (10)0.0180 (10)−0.0038 (8)0.0039 (8)−0.0048 (8)
C90.0219 (10)0.0208 (10)0.0205 (10)−0.0062 (8)0.0016 (8)−0.0068 (8)
C100.0278 (11)0.0208 (10)0.0196 (10)−0.0061 (8)0.0034 (8)−0.0059 (8)
C110.0296 (11)0.0220 (11)0.0223 (11)−0.0062 (9)0.0012 (9)−0.0019 (8)
Geometric parameters (Å, °) top
Zn1—O11.9744 (14)O2w—H2w20.84 (1)
Zn1—O1i1.9744 (14)O3w—H3w10.84 (1)
Zn1—O1w2.1078 (16)O3w—H3w20.85 (3)
Zn1—O1wi2.1078 (16)O4w—H4w10.86 (3)
Zn1—O3i2.2742 (14)O4w—H4w20.85 (1)
Zn1—O32.2742 (14)O5w—H5w10.85 (1)
Zn2—O4w2.0194 (16)O5w—H5w20.85 (1)
Zn2—O2w2.0566 (16)O6w—H6w10.85 (1)
Zn2—O3w2.0771 (16)O6w—H6w20.86 (1)
Zn2—O5w2.1091 (16)C1—C21.518 (3)
Zn2—O42.1242 (15)C2—H2A0.9700
Zn2—O52.2347 (14)C2—H2B0.9700
O1—C11.251 (2)C3—C41.380 (3)
O2—C11.244 (2)C3—C81.384 (3)
O3—C31.392 (2)C4—C51.393 (3)
O3—C21.429 (2)C4—H40.9300
O4—C91.272 (2)C5—C61.381 (3)
O5—C91.255 (2)C5—C91.488 (3)
O6—C71.371 (2)C6—C71.389 (3)
O6—C101.425 (2)C6—H60.9300
O7—C111.233 (3)C7—C81.378 (3)
O8—C111.271 (2)C8—H80.9300
O1w—H1w10.85 (1)C10—C111.503 (3)
O1w—H1w20.85 (1)C10—H10A0.9700
O2w—H2w10.84 (1)C10—H10B0.9700
O1—Zn1—O1i180.0Zn2—O4w—H4w2115.9 (18)
O1—Zn1—O1w90.41 (6)H4w1—O4w—H4w2108.3 (15)
O1i—Zn1—O1w89.59 (6)Zn2—O5w—H5w1114.5 (17)
O1—Zn1—O1wi89.59 (6)Zn2—O5w—H5w2116 (2)
O1i—Zn1—O1wi90.41 (6)H5w1—O5w—H5w2108.2 (15)
O1w—Zn1—O1wi180.00 (7)H6w1—O6w—H6w2107.9 (17)
O1—Zn1—O3i102.88 (5)H6w1—O6w'—H6w267.6 (17)
O1i—Zn1—O3i77.12 (5)O2—C1—O1124.92 (19)
O1w—Zn1—O3i91.35 (6)O2—C1—C2115.08 (18)
O1wi—Zn1—O3i88.65 (6)O1—C1—C2119.98 (17)
O1—Zn1—O377.12 (5)O3—C2—C1110.61 (17)
O1i—Zn1—O3102.88 (5)O3—C2—H2A109.5
O1w—Zn1—O388.65 (6)C1—C2—H2A109.5
O1wi—Zn1—O391.35 (6)O3—C2—H2B109.5
O3i—Zn1—O3180.00 (5)C1—C2—H2B109.5
O4w—Zn2—O2w99.31 (8)H2A—C2—H2B108.1
O4w—Zn2—O3w94.63 (7)C4—C3—C8121.46 (18)
O2w—Zn2—O3w85.62 (7)C4—C3—O3123.55 (18)
O4w—Zn2—O5w88.50 (7)C8—C3—O3114.99 (17)
O2w—Zn2—O5w89.36 (7)C3—C4—C5118.54 (18)
O3w—Zn2—O5w174.46 (6)C3—C4—H4120.7
O4w—Zn2—O4103.16 (7)C5—C4—H4120.7
O2w—Zn2—O4157.52 (7)C6—C5—C4120.94 (18)
O3w—Zn2—O491.76 (6)C6—C5—C9120.35 (18)
O5w—Zn2—O491.97 (6)C4—C5—C9118.68 (18)
O4w—Zn2—O5161.01 (6)C5—C6—C7119.11 (18)
O2w—Zn2—O597.82 (6)C5—C6—H6120.4
O3w—Zn2—O594.79 (6)C7—C6—H6120.4
O5w—Zn2—O583.55 (6)O6—C7—C8123.42 (17)
O4—Zn2—O560.09 (5)O6—C7—C6115.68 (17)
C1—O1—Zn1121.99 (13)C8—C7—C6120.90 (18)
C3—O3—C2116.78 (15)C7—C8—C3119.02 (18)
C3—O3—Zn1132.71 (12)C7—C8—H8120.5
C2—O3—Zn1110.27 (11)C3—C8—H8120.5
C9—O4—Zn292.45 (11)O5—C9—O4119.59 (18)
C9—O5—Zn287.87 (12)O5—C9—C5120.62 (17)
C7—O6—C10116.56 (15)O4—C9—C5119.76 (17)
Zn1—O1w—H1w1110 (2)O6—C10—C11109.57 (17)
Zn1—O1w—H1w2113 (2)O6—C10—H10A109.8
H1w1—O1w—H1w2109.8 (16)C11—C10—H10A109.8
Zn2—O2w—H2w1118.4 (18)O6—C10—H10B109.8
Zn2—O2w—H2w2128.7 (19)C11—C10—H10B109.8
H2w1—O2w—H2w2111.9 (16)H10A—C10—H10B108.2
Zn2—O3w—H3w1120.8 (17)O7—C11—O8125.04 (19)
Zn2—O3w—H3w2111.1 (19)O7—C11—C10120.39 (19)
H3w1—O3w—H3w2109.7 (15)O8—C11—C10114.55 (18)
Zn2—O4w—H4w1124 (2)
O1w—Zn1—O1—C1−88.19 (16)Zn1—O3—C3—C4−166.41 (14)
O1wi—Zn1—O1—C191.81 (16)C2—O3—C3—C8−172.49 (17)
O3i—Zn1—O1—C1−179.67 (15)Zn1—O3—C3—C813.7 (3)
O3—Zn1—O1—C10.33 (15)C8—C3—C4—C51.8 (3)
O1—Zn1—O3—C3172.76 (18)O3—C3—C4—C5−177.99 (18)
O1i—Zn1—O3—C3−7.24 (18)C3—C4—C5—C6−0.9 (3)
O1w—Zn1—O3—C3−96.51 (17)C3—C4—C5—C9177.00 (17)
O1wi—Zn1—O3—C383.49 (17)C4—C5—C6—C7−0.7 (3)
O1—Zn1—O3—C2−1.31 (13)C9—C5—C6—C7−178.56 (18)
O1i—Zn1—O3—C2178.69 (13)C10—O6—C7—C86.0 (3)
O1w—Zn1—O3—C289.42 (14)C10—O6—C7—C6−173.57 (17)
O1wi—Zn1—O3—C2−90.58 (14)C5—C6—C7—O6−179.03 (17)
O4w—Zn2—O4—C9−169.99 (12)C5—C6—C7—C81.4 (3)
O2w—Zn2—O4—C912.0 (2)O6—C7—C8—C3180.00 (17)
O3w—Zn2—O4—C994.84 (12)C6—C7—C8—C3−0.5 (3)
O5w—Zn2—O4—C9−81.07 (12)C4—C3—C8—C7−1.2 (3)
O5—Zn2—O4—C90.33 (11)O3—C3—C8—C7178.66 (18)
O4w—Zn2—O5—C929.9 (3)Zn2—O5—C9—O40.56 (18)
O2w—Zn2—O5—C9−175.84 (12)Zn2—O5—C9—C5178.66 (17)
O3w—Zn2—O5—C9−89.61 (12)Zn2—O4—C9—O5−0.58 (19)
O5w—Zn2—O5—C995.70 (12)Zn2—O4—C9—C5−178.70 (16)
O4—Zn2—O5—C9−0.33 (11)C6—C5—C9—O524.9 (3)
Zn1—O1—C1—O2−177.86 (15)C4—C5—C9—O5−152.95 (19)
Zn1—O1—C1—C20.7 (3)C6—C5—C9—O4−156.98 (18)
C3—O3—C2—C1−173.21 (17)C4—C5—C9—O425.1 (3)
Zn1—O3—C2—C11.9 (2)C7—O6—C10—C11175.12 (16)
O2—C1—C2—O3176.85 (17)O6—C10—C11—O716.0 (3)
O1—C1—C2—O3−1.9 (3)O6—C10—C11—O8−165.57 (17)
C2—O3—C3—C47.4 (3)
Symmetry codes: (i) −x+2, −y, −z+1.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1w—H1w1···O5ii0.85 (1)1.95 (1)2.786 (2)170 (3)
O1w—H1w2···O7iii0.85 (1)2.10 (2)2.836 (2)145 (3)
O2w—H2w1···O7iv0.84 (1)1.82 (1)2.657 (2)172 (3)
O2w—H2w2···O6w0.84 (1)2.09 (2)2.843 (4)150 (3)
O3w—H3w1···O8ii0.84 (1)1.93 (1)2.761 (2)167 (2)
O3w—H3w2···O2v0.85 (3)1.93 (1)2.772 (2)172 (3)
O4w—H4w1···O4vi0.86 (3)1.91 (1)2.758 (2)173 (3)
O4w—H4w2···O8vii0.85 (1)1.81 (1)2.655 (2)180 (3)
O5w—H5w1···O2viii0.85 (1)1.84 (1)2.685 (2)170 (2)
O5w—H5w2···O6wix0.85 (1)1.97 (2)2.708 (3)144 (3)
O5w—H5w2···O6w'ix0.85 (1)1.90 (1)2.732 (6)168 (3)
O6w—H6w1···O8vii0.85 (1)1.94 (2)2.747 (3)158 (4)
O6w—H6w2···O5wx0.86 (1)1.98 (2)2.791 (3)156 (4)
Symmetry codes: (ii) −x+1, −y+1, −z+1; (iii) x, y−1, z; (iv) −x+1, −y+2, −z+1; (v) x−1, y+1, z; (vi) −x+1, −y+1, −z+2; (vii) x−1, y, z+1; (viii) x, y+1, z; (ix) x+1, y, z; (x) −x, −y+2, −z+2.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1w—H1w1···O5i0.85 (1)1.95 (1)2.786 (2)170 (3)
O1w—H1w2···O7ii0.85 (1)2.10 (2)2.836 (2)145 (3)
O2w—H2w1···O7iii0.84 (1)1.82 (1)2.657 (2)172 (3)
O2w—H2w2···O6w0.84 (1)2.09 (2)2.843 (4)150 (3)
O3w—H3w1···O8i0.84 (1)1.93 (1)2.761 (2)167 (2)
O3w—H3w2···O2iv0.85 (3)1.93 (1)2.772 (2)172 (3)
O4w—H4w1···O4v0.86 (3)1.91 (1)2.758 (2)173 (3)
O4w—H4w2···O8vi0.85 (1)1.81 (1)2.655 (2)180 (3)
O5w—H5w1···O2vii0.85 (1)1.84 (1)2.685 (2)170 (2)
O5w—H5w2···O6wviii0.85 (1)1.97 (2)2.708 (3)144 (3)
O5w—H5w2···O6w'viii0.85 (1)1.90 (1)2.732 (6)168 (3)
O6w—H6w1···O8vi0.85 (1)1.94 (2)2.747 (3)158 (4)
O6w—H6w2···O5wix0.86 (1)1.98 (2)2.791 (3)156 (4)
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x, y−1, z; (iii) −x+1, −y+2, −z+1; (iv) x−1, y+1, z; (v) −x+1, −y+1, −z+2; (vi) x−1, y, z+1; (vii) x, y+1, z; (viii) x+1, y, z; (ix) −x, −y+2, −z+2.
Acknowledgements top

We thank the Foundation of Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces (No. 0506) and the University of Malaya for supporting this study.

references
References top

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