share
share
Issue contentsclose
Statistics
close
Download citation
closeDownload citation
Format BIBTeX
EndNote
RefMan
Refer
Medline
CIF
SGML
Text
Plain Text
Supporting information
Supporting informationclose
Download PDF of article
Download PDF of articleclose
Acta Cryst. (2007). E63, m2875
https://doi.org/10.1107/S1600536807053159
Download PDF of article
Download PDF of articleclose
Supporting information
Supporting informationclose
Download citation
closeDownload citation
Format BIBTeX
EndNote
RefMan
Refer
Medline
CIF
SGML
Text
Plain Text
Statistics
close
Issue contentsclose
share
link to html

catena-Poly[[bis­(1-ethyl­imidazole-κN3)zinc(II)]-μ-phthalato-κ2O1:O2]

R.-X. Li, S.-X. Li, L. Liu, G.-Y. Liu and F.-Q. Liu
In the solid state, the title compound, [Zn(C8H4O4)(C5H8N2)2]n, exhibits polymeric zigzag chains extended along th c axis. Each ZnII ion is coordinated by two N and two O atoms in a distorted tetra­hedral geometry. Weak C—H...O inter­actions contribute to the crystal packing stability.
Read articleSimilar articles

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807053159/hg2326sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536807053159/hg2326Isup2.hkl
Contains datablock I

CCDC reference: 672570

checkCIF report

Key indicators

  • Single-crystal X-ray study
  • T = 293 K
  • Mean [sigma](C-C) = 0.015 Å
  • R factor = 0.060
  • wR factor = 0.183
  • Data-to-parameter ratio = 11.4

checkCIF/PLATON results

No syntax errors found




Alert level C
PLAT220_ALERT_2_C Large Non-Solvent    C     Ueq(max)/Ueq(min) ...       2.95 Ratio
PLAT241_ALERT_2_C Check High      Ueq as Compared to Neighbors for         N2
PLAT341_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ...         15


Alert level G
REFLT03_ALERT_4_G  WARNING: Large fraction of Friedel related reflns may
                     be needed to determine absolute structure
           From the CIF: _diffrn_reflns_theta_max           26.00
           From the CIF: _reflns_number_total               2125
           Count of symmetry unique reflns         1980
           Completeness (_total/calc)            107.32%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured       145
           Fraction of Friedel pairs measured     0.073
           Are heavy atom types Z>Si present        yes
PLAT199_ALERT_1_G Check the Reported _cell_measurement_temperature        293 K
PLAT200_ALERT_1_G Check the Reported _diffrn_ambient_temperature .        293 K
PLAT794_ALERT_5_G Check Predicted Bond Valency for Zn          (2)       1.88
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......         62


   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   3 ALERT level C = Check and explain
   5 ALERT level G = General alerts; check

   2 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
   2 ALERT type 3 Indicator that the structure quality may be low
   1 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check
Comment top

In the title compound,(I)(Fig. 1), The zinc(II) centers are bridged by the carboxylate group of o-phthalate and saturated by 1-ethylimidazole. Each ZnII ion is coordinated by two N [Zn—N1 = 1.993 (8), Zn—N3 = 2.028 (8) Å] and two O [Zn—O2 = 1.974 (6), Zn—O3 = 1.976 (7) Å] atoms in a distorted tetrahedral geometry. All these values agree well with those observed in [Zn(phthalato)(1-H-imidazole)2] (Liu et al., 2002). Each o-phthalate dianion acts as a bidentate ligand to bridge two ZnII atoms through two monodentate carboxylate groups, building a zigzag infinite chain structure alonge the c axis. The metal-metal distances across each polymer backbone are 6.889 (3) Å. In the crystal, Weak C—H···O interactions contribute to the crystal packing stability.

Related literature top

For related literature, see: Liu et al. (2002).

Experimental top

The reaction of ZnCl2(0.68 g, 5 mmol) with o-phthalic acid (0.83 g, 5 mmol) in an aqueous-alcohol (3:1) solution (40 ml) at 363 K for 30 minutes produced a blue solution, to which 1-ethylimidazole (0.95 g,10 mmol) was added. The reaction solution was kept at room temperature after stirring for an hour at 333 K. colorless crystals were obtained after a few days.

Refinement top

H atoms were positioned geometrically(C—H = 0.93–0.97 Å) and allowed to ride on their parent atoms with Uiso(H) = 1.2 times Ueq(C).

Computing details top

Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXTL (Sheldrick, 2001); program(s) used to refine structure: SHELXTL (Sheldrick, 2001); molecular graphics: SHELXTL (Sheldrick, 2001); software used to prepare material for publication: SHELXTL (Sheldrick, 2001 and local programs.

Figures top
[Figure 1] Fig. 1. A portion of the polymeric chain in the title compound showing atomic numbering and 30% probability displacement ellipsoids [symmetry codes: (A) -x + 1/2,y,z - 1/2.
[Figure 2] Fig. 2. The packing of (I), viewed down the a axis.
catena-Poly[[bis(1-ethylimidazole-κN3)zinc(II)]-µ-phthalato-κ2O1:O2] top
Crystal data top
[Zn(C8H4O4)(C5H8N2)2]F(000) = 864
Mr = 419.75Dx = 1.450 Mg m−3
Orthorhombic, Pca21Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2c -2acCell parameters from 3025 reflections
a = 10.209 (2) Åθ = 2.5–25.1°
b = 13.870 (3) ŵ = 1.31 mm−1
c = 13.583 (3) ÅT = 293 K
V = 1923.3 (7) Å3Block, colorless
Z = 40.40 × 0.10 × 0.10 mm
Data collection top
Bruker SMART 1K CCD area-detector
diffractometer		2125 independent reflections
Radiation source: fine-focus sealed tube1404 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.012
thin–slice ω scansθmax = 26.0°, θmin = 1.5°
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)		h = 0→12
Tmin = 0.623, Tmax = 0.880k = 0→17
2616 measured reflectionsl = 0→16
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.060H-atom parameters constrained
wR(F2) = 0.183 w = 1/[σ2(Fo2) + (0.0962P)2 + 2.22P]
where P = (Fo2 + 2Fc2)/3
S = 1.02(Δ/σ)max = 0.006
2125 reflectionsΔρmax = 0.73 e Å−3
186 parametersΔρmin = −0.91 e Å−3
62 restraintsAbsolute structure: Flack (1983), 145 Friedel pairs
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 0.02 (5)
Crystal data top
[Zn(C8H4O4)(C5H8N2)2]V = 1923.3 (7) Å3
Mr = 419.75Z = 4
Orthorhombic, Pca21Mo Kα radiation
a = 10.209 (2) ŵ = 1.31 mm−1
b = 13.870 (3) ÅT = 293 K
c = 13.583 (3) Å0.40 × 0.10 × 0.10 mm
Data collection top
Bruker SMART 1K CCD area-detector
diffractometer		2125 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2004)		1404 reflections with I > 2σ(I)
Tmin = 0.623, Tmax = 0.880Rint = 0.012
2616 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.060H-atom parameters constrained
wR(F2) = 0.183Δρmax = 0.73 e Å−3
S = 1.02Δρmin = −0.91 e Å−3
2125 reflectionsAbsolute structure: Flack (1983), 145 Friedel pairs
186 parametersAbsolute structure parameter: 0.02 (5)
62 restraints
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.

Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Zn0.19333 (9)0.74668 (7)0.75914 (15)0.0293 (3)
O10.3715 (7)0.7223 (5)0.5888 (5)0.0359 (16)
O20.3432 (6)0.8244 (5)0.7131 (5)0.0346 (15)
O30.1449 (7)0.8235 (5)0.8761 (5)0.0406 (17)
O4−0.0256 (8)0.7258 (5)0.8876 (6)0.0401 (17)
N10.2555 (9)0.6214 (5)0.8137 (7)0.0377 (17)
N20.3722 (10)0.4877 (7)0.8343 (9)0.060
N30.0552 (7)0.7507 (5)0.6519 (7)0.0294 (17)
N4−0.1320 (9)0.7819 (7)0.5765 (9)0.055
C10.4036 (12)0.4780 (9)1.0816 (11)0.060
H1A0.37770.46041.14710.090*
H1B0.42030.54611.07900.090*
H1C0.48170.44351.06400.090*
C20.2942 (11)0.4526 (9)1.0096 (10)0.055
H2B0.30160.38470.99350.066*
H2C0.21100.46161.04290.066*
C30.2910 (10)0.5061 (7)0.9196 (9)0.041
C40.3455 (9)0.5592 (7)0.7707 (9)0.045
H4B0.38140.56600.70820.054*
C50.2333 (10)0.5884 (7)0.9032 (8)0.042 (2)
H5A0.18220.62040.94950.051*
C6−0.1131 (13)0.7339 (10)0.3451 (11)0.062 (3)
H6A−0.09540.74360.27640.093*
H6B−0.20570.73780.35640.093*
H6C−0.08190.67150.36470.093*
C7−0.0448 (12)0.8101 (8)0.4040 (8)0.049 (3)
H7A0.04230.81960.37710.059*
H7B−0.09220.87030.39680.059*
C8−0.0330 (10)0.7880 (7)0.5088 (8)0.036
C90.0760 (10)0.7683 (6)0.5575 (8)0.035 (2)
H9A0.15850.76700.52850.042*
C10−0.0729 (10)0.7633 (8)0.6662 (9)0.045 (3)
H10A−0.11560.76000.72660.054*
C110.3983 (9)0.7972 (6)0.6299 (7)0.031 (2)
C120.0351 (9)0.7984 (7)0.9131 (7)0.031
C13−0.0231 (8)0.8647 (5)0.9879 (6)0.021
C14−0.1150 (10)0.9321 (7)0.9505 (8)0.042 (2)
H14A−0.13350.93340.88350.050*
C15−0.1767 (11)0.9953 (8)1.0126 (10)0.054 (3)
H15A−0.23931.03770.98810.065*
C16−0.1455 (12)0.9963 (9)1.1132 (10)0.056
H16A−0.18611.03991.15530.067*
C17−0.0560 (10)0.9333 (7)1.1485 (7)0.039 (2)
H17A−0.03590.93451.21530.046*
C180.0063 (8)0.8675 (6)1.0892 (7)0.0271 (18)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn0.0352 (5)0.0290 (5)0.0237 (5)0.0015 (4)−0.0025 (6)0.0013 (5)
O10.046 (4)0.032 (3)0.030 (4)−0.010 (3)0.009 (3)−0.004 (3)
O20.047 (4)0.042 (4)0.015 (3)−0.002 (3)0.003 (3)0.004 (3)
O30.053 (4)0.037 (4)0.032 (4)0.001 (3)0.009 (3)−0.004 (3)
O40.051 (5)0.041 (4)0.029 (4)−0.010 (3)−0.006 (4)−0.009 (3)
N10.038 (4)0.040 (4)0.035 (4)0.003 (3)0.001 (4)−0.001 (3)
N20.0600.0600.0600.0000.0000.000
N30.022 (4)0.037 (4)0.029 (5)0.001 (3)−0.003 (3)−0.002 (3)
N40.0550.0550.0550.0000.0000.000
C10.0600.0600.0600.0000.0000.000
C20.0550.0550.0550.0000.0000.000
C30.0410.0410.0410.0000.0000.000
C40.0450.0450.0450.0000.0000.000
C50.042 (5)0.044 (4)0.041 (5)0.004 (4)−0.002 (4)0.004 (4)
C60.064 (7)0.087 (7)0.035 (6)−0.005 (5)0.000 (5)−0.011 (5)
C70.047 (5)0.059 (6)0.041 (5)0.000 (5)0.001 (5)0.004 (5)
C80.0360.0360.0360.0000.0000.000
C90.030 (5)0.044 (5)0.030 (6)0.000 (4)−0.004 (4)0.011 (4)
C100.029 (5)0.079 (8)0.027 (6)0.004 (5)0.003 (4)0.004 (5)
C110.043 (5)0.024 (4)0.026 (5)−0.004 (4)−0.004 (4)0.012 (4)
C120.0310.0310.0310.0000.0000.000
C130.0210.0210.0210.0000.0000.000
C140.055 (6)0.034 (5)0.036 (6)0.006 (5)−0.001 (5)0.012 (4)
C150.062 (7)0.031 (5)0.070 (9)0.011 (5)−0.014 (6)0.005 (6)
C160.0560.0560.0560.0000.0000.000
C170.054 (6)0.039 (5)0.023 (5)0.002 (4)0.004 (5)0.000 (4)
C180.029 (4)0.034 (4)0.019 (4)−0.003 (3)−0.007 (4)0.000 (4)
Geometric parameters (Å, º) top
Zn—O21.974 (6)C5—H5A0.9300
Zn—O31.976 (7)C6—C71.498 (18)
Zn—N11.993 (8)C6—H6A0.9600
Zn—N32.028 (8)C6—H6B0.9600
O1—C111.211 (12)C6—H6C0.9600
O2—C111.318 (12)C7—C81.461 (16)
O3—C121.277 (12)C7—H7A0.9700
O4—C121.232 (12)C7—H7B0.9700
N1—C51.318 (14)C8—C91.322 (14)
N1—C41.389 (13)C9—H9A0.9300
N2—C41.343 (15)C10—H10A0.9300
N2—C31.448 (16)C11—C18i1.485 (12)
N3—C91.323 (14)C12—C131.493 (12)
N3—C101.333 (14)C13—C181.409 (12)
N4—C81.369 (14)C13—C141.419 (13)
N4—C101.384 (15)C14—C151.370 (17)
C1—C21.526 (17)C14—H14A0.9300
C1—H1A0.9600C15—C161.403 (18)
C1—H1B0.9600C15—H15A0.9300
C1—H1C0.9600C16—C171.352 (15)
C2—C31.430 (17)C16—H16A0.9300
C2—H2B0.9700C17—C181.374 (13)
C2—H2C0.9700C17—H17A0.9300
C3—C51.305 (14)C18—C11ii1.485 (12)
C4—H4B0.9300
O2—Zn—O398.9 (3)H6A—C6—H6C109.5
O2—Zn—N1110.3 (3)H6B—C6—H6C109.5
O3—Zn—N1104.5 (3)C8—C7—C6114.3 (10)
O2—Zn—N3107.2 (3)C8—C7—H7A108.7
O3—Zn—N3112.9 (3)C6—C7—H7A108.7
N1—Zn—N3120.8 (3)C8—C7—H7B108.7
C11—O2—Zn116.5 (6)C6—C7—H7B108.7
C12—O3—Zn112.9 (6)H7A—C7—H7B107.6
C5—N1—C4106.6 (9)C9—C8—N4105.8 (10)
C5—N1—Zn126.2 (7)C9—C8—C7126.9 (10)
C4—N1—Zn126.6 (7)N4—C8—C7127.3 (10)
C4—N2—C3105.6 (9)C8—C9—N3112.8 (10)
C9—N3—C10105.9 (9)C8—C9—H9A123.6
C9—N3—Zn126.1 (7)N3—C9—H9A123.6
C10—N3—Zn125.5 (8)N3—C10—N4108.9 (10)
C8—N4—C10106.3 (9)N3—C10—H10A125.5
C2—C1—H1A109.5N4—C10—H10A125.5
C2—C1—H1B109.5O1—C11—O2123.0 (8)
H1A—C1—H1B109.5O1—C11—C18i122.7 (9)
C2—C1—H1C109.5O2—C11—C18i114.3 (8)
H1A—C1—H1C109.5O4—C12—O3123.6 (9)
H1B—C1—H1C109.5O4—C12—C13119.6 (8)
C3—C2—C1116.4 (10)O3—C12—C13116.7 (8)
C3—C2—H2B108.2C18—C13—C14118.2 (8)
C1—C2—H2B108.2C18—C13—C12126.6 (8)
C3—C2—H2C108.2C14—C13—C12115.2 (8)
C1—C2—H2C108.2C15—C14—C13120.4 (10)
H2B—C2—H2C107.3C15—C14—H14A119.8
C5—C3—C2127.6 (11)C13—C14—H14A119.8
C5—C3—N2106.0 (10)C14—C15—C16120.1 (11)
C2—C3—N2125.5 (10)C14—C15—H15A120.0
N2—C4—N1108.8 (10)C16—C15—H15A120.0
N2—C4—H4B125.6C17—C16—C15119.5 (12)
N1—C4—H4B125.6C17—C16—H16A120.2
C3—C5—N1112.6 (10)C15—C16—H16A120.2
C3—C5—H5A123.7C16—C17—C18122.3 (10)
N1—C5—H5A123.7C16—C17—H17A118.9
C7—C6—H6A109.5C18—C17—H17A118.9
C7—C6—H6B109.5C17—C18—C13119.5 (8)
H6A—C6—H6B109.5C17—C18—C11ii121.4 (8)
C7—C6—H6C109.5C13—C18—C11ii119.0 (8)
O3—Zn—O2—C11−176.2 (6)C10—N4—C8—C7−177.7 (11)
N1—Zn—O2—C1174.6 (7)C6—C7—C8—C9111.4 (13)
N3—Zn—O2—C11−58.8 (6)C6—C7—C8—N4−67.4 (15)
O2—Zn—O3—C12169.3 (6)N4—C8—C9—N3−0.6 (12)
N1—Zn—O3—C12−76.9 (7)C7—C8—C9—N3−179.6 (10)
N3—Zn—O3—C1256.3 (7)C10—N3—C9—C8−2.5 (12)
O2—Zn—N1—C5122.8 (9)Zn—N3—C9—C8−165.5 (7)
O3—Zn—N1—C517.4 (9)C9—N3—C10—N44.5 (12)
N3—Zn—N1—C5−111.1 (9)Zn—N3—C10—N4167.7 (7)
O2—Zn—N1—C4−47.0 (9)C8—N4—C10—N3−4.9 (13)
O3—Zn—N1—C4−152.4 (8)Zn—O2—C11—O1−9.0 (12)
N3—Zn—N1—C479.1 (9)Zn—O2—C11—C18i169.3 (6)
O2—Zn—N3—C923.5 (8)Zn—O3—C12—O49.5 (12)
O3—Zn—N3—C9131.3 (7)Zn—O3—C12—C13−167.5 (6)
N1—Zn—N3—C9−104.1 (8)O4—C12—C13—C1899.1 (12)
O2—Zn—N3—C10−136.4 (8)O3—C12—C13—C18−83.8 (11)
O3—Zn—N3—C10−28.6 (9)O4—C12—C13—C14−82.3 (11)
N1—Zn—N3—C1096.1 (9)O3—C12—C13—C1494.9 (10)
C1—C2—C3—C5−87.3 (16)C18—C13—C14—C15−2.5 (14)
C1—C2—C3—N280.3 (15)C12—C13—C14—C15178.7 (9)
C4—N2—C3—C5−5.0 (13)C13—C14—C15—C162.4 (17)
C4—N2—C3—C2−174.8 (10)C14—C15—C16—C17−1.1 (18)
C3—N2—C4—N11.7 (12)C15—C16—C17—C18−0.1 (17)
C5—N1—C4—N22.2 (12)C16—C17—C18—C130.0 (15)
Zn—N1—C4—N2173.6 (7)C16—C17—C18—C11ii−178.3 (9)
C2—C3—C5—N1176.2 (10)C14—C13—C18—C171.3 (13)
N2—C3—C5—N16.8 (13)C12—C13—C18—C17179.9 (8)
C4—N1—C5—C3−5.8 (12)C14—C13—C18—C11ii179.6 (8)
Zn—N1—C5—C3−177.2 (7)C12—C13—C18—C11ii−1.7 (13)
C10—N4—C8—C93.3 (12)
Symmetry codes: (i) −x+1/2, y, z−1/2; (ii) −x+1/2, y, z+1/2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C5—H5A···O1ii0.932.423.309 (13)159
C7—H7A···O2i0.972.523.317 (13)140
C9—H9A···O10.932.413.113 (12)133
C10—H10A···O40.932.423.090 (15)129
C16—H16A···O2iii0.932.593.478 (14)159
Symmetry codes: (i) −x+1/2, y, z−1/2; (ii) −x+1/2, y, z+1/2; (iii) −x, −y+2, z+1/2.

Experimental details

Crystal data
Chemical formula[Zn(C8H4O4)(C5H8N2)2]
Mr419.75
Crystal system, space groupOrthorhombic, Pca21
Temperature (K)293
a, b, c (Å)10.209 (2), 13.870 (3), 13.583 (3)
V (Å3)1923.3 (7)
Z4
Radiation typeMo Kα
µ (mm−1)1.31
Crystal size (mm)0.40 × 0.10 × 0.10
Data collection
DiffractometerBruker SMART 1K CCD area-detector
diffractometer
Absorption correctionMulti-scan
(SADABS; Sheldrick, 2004)
Tmin, Tmax0.623, 0.880
No. of measured, independent and
observed [I > 2σ(I)] reflections		2616, 2125, 1404
Rint0.012
(sin θ/λ)max (Å−1)0.617
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.060, 0.183, 1.02
No. of reflections2125
No. of parameters186
No. of restraints62
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.73, −0.91
Absolute structureFlack (1983), 145 Friedel pairs
Absolute structure parameter0.02 (5)

Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2001), SHELXTL (Sheldrick, 2001), SHELXTL (Sheldrick, 2001 and local programs.

Selected bond lengths (Å) top
Zn—O21.974 (6)O1—C111.211 (12)
Zn—O31.976 (7)O2—C111.318 (12)
Zn—N11.993 (8)O3—C121.277 (12)
Zn—N32.028 (8)O4—C121.232 (12)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C5—H5A···O1i0.932.423.309 (13)158.9
C7—H7A···O2ii0.972.523.317 (13)139.7
C9—H9A···O10.932.413.113 (12)133
C10—H10A···O40.932.423.090 (15)129
C16—H16A···O2iii0.932.593.478 (14)159.0
Symmetry codes: (i) −x+1/2, y, z+1/2; (ii) −x+1/2, y, z−1/2; (iii) −x, −y+2, z+1/2.
 

Follow Acta Cryst. E
Sign up for e-alerts
E-alerts
Follow Acta Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS