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metal-organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 68| Part 7| July 2012| Pages m989-m990
https://doi.org/10.1107/S1600536812028188

catena-Poly[[gallium(III)-bis­­[μ-D/L-tartrato(2−)]-gallium(III)-di-μ-hydroxido] dihydrate]

Xiaojing Liu,a Ruijing Tian,a Cailing Zhang,a Xia Zhia and Qinhe Pana*

aDepartment of Materials and Chemical Engineering, Ministry of Education, Key Laboratory of Advanced Materials of Tropical Island Resources, Hainan University, Haikou 570228, People's Republic of China
*Correspondence e-mail: panqinhe@163.com

(Received 6 June 2012; accepted 21 June 2012; online 30 June 2012)

In the title compound, {[Ga2(C4H4O6)2(OH)2]·2H2O}n, the GaIII atom is located on a twofold rotation axis and is six-coordinated by two O atoms from bridging hydroxide groups and four O atoms from two symmetry-related tartrate units in a slightly distorted octa­hedral environment. Each tartrate unit binds to two GaIII atoms as a bis-chelating bridging ligand by two pairs of hydroxide groups and an O atom of a carboxyl­ate group. The GaIII atoms are linked by two bridging hydroxide groups located on mirror planes. In this way a chain along the c axis is formed. Free water mol­ecules on mirror planes are located between the chains and hold them together through hydrogen-bonding inter­actions, with O⋯O distances in the range 2.509 (3)–3.179 (5) Å.

Related literature

For the potential applications of coordination polymers in drug delivery, shape-selective sorption/separation and catalysis, see: Chen & Tong (2007[Chen, X.-M. & Tong, M.-L. (2007). Acc. Chem. Res. 40, 162-170.]); Zeng et al. (2009[Zeng, T.-F., Hu, X. & Bu, X.-H. (2009). Chem. Soc. Rev. 38, 469-480.]). For a description of their one-dimensional to three-dimensional architectures, see: Du & Bu (2009[Du, M. & Bu, X.-H. (2009). Bull. Chem. Soc. Jpn, 80, 539-554.]); Qiu & Zhu (2009[Qiu, S.-L. & Zhu, G.-S. (2009). Coord. Chem. Rev. 253, 2891-2911.]). For our recent research on the synthesis of coordination polymers, see: Pan, Cheng & Bu (2010[Pan, Q. H., Cheng, Q. & Bu, X.-H. (2010). CrystEngComm, 12, 4198-4204.], 2011[Pan, Q. H., Cheng, Q. & Bu, X.-H. (2011). Chem. J. Chin. Univ. 32, 527-531.]); Pan, Cheng & Hu (2010[Pan, Q. H., Cheng, Q. & Hu, T.-L. (2010). Chin. J. Inorg. Chem. 26, 2299-2302.]); Pan, Li et al. (2010[Pan, Q. H., Li, J. Y. & Bu, X.-H. (2010). Microporous Mesoporous Mater. 132, 453-457.]); Pan, Ma et al. (2012[Pan, Q. H., Ma, H. & Hu, T.-L. (2012). J. Mol. Struct. 1011, 134-139.]); Wu et al. (2011[Wu, Q., Wang, F., Jiang, N., Cao, L. & Pan, Q. (2011). Acta Cryst. E67, m1710-m1711.]).

[Scheme 1]

Experimental

Crystal data

  • [Ga2(C4H4O6)2(OH)2]·2H2O

  • Mr = 505.64

  • Orthorhombic, I b a m

  • a = 8.6830 (17) Å

  • b = 10.797 (2) Å

  • c = 16.158 (3) Å

  • V = 1514.8 (5) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 3.65 mm−1

  • T = 293 K

  • 0.30 × 0.20 × 0.15 mm
Data collection

  • Rigaku R-AXIS RAPID-S diffractometer

  • Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalClear and CrystalStructure. Rigaku/MSC Inc., USA.]) Tmin = 0.421, Tmax = 0.578

  • 7524 measured reflections

  • 897 independent reflections

  • 756 reflections with I > 2σ(I)

  • Rint = 0.045
Refinement

  • R[F2 > 2σ(F2)] = 0.031

  • wR(F2) = 0.074

  • S = 1.14

  • 897 reflections

  • 63 parameters

  • H-atom parameters constrained

  • Δρmax = 0.48 e Å−3

  • Δρmin = −0.41 e Å−3

Table 1
Selected bond lengths (Å)

Ga1—O1 2.0102 (19)
Ga1—O2 1.970 (2)
Ga1—O4 1.9219 (18)

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A D⋯A D—H⋯A
O1—H2⋯O3i 0.89 1.64 2.509 (3) 163
O4—H4⋯O1Wii 0.89 1.91 2.774 (5) 162
O1W—H1W⋯O2 0.89 2.56 3.179 (5) 127
Symmetry codes: (i) [-x+{\script{1\over 2}}, y-{\script{1\over 2}}, z]; (ii) [x+{\script{1\over 2}}, -y+{\script{3\over 2}}, z].

Data collection: RAPID-AUTO (Rigaku, 1998[Rigaku (1998). RAPID-AUTO. Rigaku Corporation, Tokyo, Japan.]); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalClear and CrystalStructure. Rigaku/MSC Inc., USA.]); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks I, global. DOI: https://doi.org/10.1107/S1600536812028188/vn2042sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812028188/vn2042Isup2.hkl

checkCIF report


Comment top

Recently, increasing attention has been paid to the design and synthesis of coordination polymers, because of their potential applications in drug delivery, shape-selective sorption/separation, and catalysis (Chen & Tong, 2007; Zeng et al., 2009). Their structures vary from one-dimensional to three-dimensional architectures (Qiu & Zhu, 2009; Du & Bu, 2009). Our recent research interest has been focused on the synthesis of novel coordination polymers (Pan, Cheng & Bu, 2010, 2011; Pan, Cheng & Hu, 2010; Pan, Li et al., 2010; Pan, Ma et al., 2012; Wu et al. 2011). Here we present a Ga-containing coordination polymer with a one-dimensional chain structure.

As shown in Fig. 1, the asymmetric part of crystal structure of the title compound consists of half a GaIII atom, half a tartrate anion, half a bridging hydroxide group, and half a free water molecule. The GaIII atom is located on a twofold rotation axis and is six-coordinated by two O atoms from the bridging hydroxide groups, and four O atoms from two different tartrate units in a slightly distorted octahedral environment, with Ga—O bond distances in the range of 1.9219 (18) to 2.0102 (19) Å. The carboxylate groups of the tartrate are completely deprononated, the hydroxide group, however, is not. Chelated by the O1 atom from a hydroxide group and the O2 atom of neighboring carboxylate groups, each tartrate unit binds to two GaIII atoms as a bis-chelating bridging ligand. Two GaIII atoms and two tartrate units are linked to form a building unit, each building unit being surround by four O atoms of four different hydroxide groups, which is located on mirror, and linked two building units as the bridging hydroxide groups. In this way a one-dimensional chain along the c axis is formed by linking building units and the bridging hydroxide groups. Free water molecules reside between the chains while connecting them by hydrogen-bonding interactions as to form a three-dimensional supermolecular structure with O···O distances ranging from 2.509 (3)–3.179 (5) Å.

Related literature top

For the potential applications of coordination polymers in drug delivery, shape-selective sorption/separation and catalysis, see: Chen & Tong (2007); Zeng et al. (2009). For a description of their one-dimensional to three-dimensional architectures, see: Du & Bu (2009); Qiu & Zhu (2009). For our recent research on the synthesis of coordination polymers, see: Pan, Cheng & Bu (2010, 2011); Pan, Cheng & Hu (2010); Pan, Li et al. (2010); Pan, Ma et al. (2012); Wu et al. (2011).

Experimental top

In a typical synthesis, a mixture of Ga2O3 (0.047 g), D,L-tartaric acid (0.075 g), and H2O (10 ml), was added to a 20 ml Teflon-lined reactor under autogenous pressure at 160 °C for 3 days, after which colorless prismatic shaped crystals were obtained.

Refinement top

All H atoms were positioned geometrically (O—H = 0.89 Å, C—H = 0.98 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.2Ueq(parent atom).

Structure description top

Recently, increasing attention has been paid to the design and synthesis of coordination polymers, because of their potential applications in drug delivery, shape-selective sorption/separation, and catalysis (Chen & Tong, 2007; Zeng et al., 2009). Their structures vary from one-dimensional to three-dimensional architectures (Qiu & Zhu, 2009; Du & Bu, 2009). Our recent research interest has been focused on the synthesis of novel coordination polymers (Pan, Cheng & Bu, 2010, 2011; Pan, Cheng & Hu, 2010; Pan, Li et al., 2010; Pan, Ma et al., 2012; Wu et al. 2011). Here we present a Ga-containing coordination polymer with a one-dimensional chain structure.

As shown in Fig. 1, the asymmetric part of crystal structure of the title compound consists of half a GaIII atom, half a tartrate anion, half a bridging hydroxide group, and half a free water molecule. The GaIII atom is located on a twofold rotation axis and is six-coordinated by two O atoms from the bridging hydroxide groups, and four O atoms from two different tartrate units in a slightly distorted octahedral environment, with Ga—O bond distances in the range of 1.9219 (18) to 2.0102 (19) Å. The carboxylate groups of the tartrate are completely deprononated, the hydroxide group, however, is not. Chelated by the O1 atom from a hydroxide group and the O2 atom of neighboring carboxylate groups, each tartrate unit binds to two GaIII atoms as a bis-chelating bridging ligand. Two GaIII atoms and two tartrate units are linked to form a building unit, each building unit being surround by four O atoms of four different hydroxide groups, which is located on mirror, and linked two building units as the bridging hydroxide groups. In this way a one-dimensional chain along the c axis is formed by linking building units and the bridging hydroxide groups. Free water molecules reside between the chains while connecting them by hydrogen-bonding interactions as to form a three-dimensional supermolecular structure with O···O distances ranging from 2.509 (3)–3.179 (5) Å.

For the potential applications of coordination polymers in drug delivery, shape-selective sorption/separation and catalysis, see: Chen & Tong (2007); Zeng et al. (2009). For a description of their one-dimensional to three-dimensional architectures, see: Du & Bu (2009); Qiu & Zhu (2009). For our recent research on the synthesis of coordination polymers, see: Pan, Cheng & Bu (2010, 2011); Pan, Cheng & Hu (2010); Pan, Li et al. (2010); Pan, Ma et al. (2012); Wu et al. (2011).

Computing details top

Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. A view of the asymmetric unit of complex. Ellipsoids are drawn at the 30% probability level. [Symmetry codes: (i) 1 - x,1 - y,1 - z; (ii) 1 - x,1 - y,z; (v) x,1 - y,3/2 - z; (vi) 1 - x,y,3/2 - z; (vii) x,1 - y,1/2 + z.
catena-Poly[[gallium(III)-bis[µ-D/L-tartrato(2-)]- gallium(III)-di-µ-hydroxido] dihydrate] top
Crystal data top
[Ga2(C4H4O6)2(OH)2]·2H2OF(000) = 1008
Mr = 505.64Dx = 2.217 Mg m−3
Orthorhombic, IbamMo Kα radiation, λ = 0.71073 Å
Hall symbol: -I22cCell parameters from 7524 reflections
a = 8.6830 (17) Åθ = 3.0–27.4°
b = 10.797 (2) ŵ = 3.65 mm−1
c = 16.158 (3) ÅT = 293 K
V = 1514.8 (5) Å3Prism, colorless
Z = 40.3 × 0.2 × 0.15 mm
Data collection top
Rigaku R-AXIS RAPID-S
diffractometer		897 independent reflections
Radiation source: fine-focus sealed tube756 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.045
ω scansθmax = 27.4°, θmin = 3.0°
Absorption correction: multi-scan
(CrystalClear; Rigaku/MSC, 2002)		h = −11→11
Tmin = 0.421, Tmax = 0.578k = −13→14
7524 measured reflectionsl = −20→20
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)] = 0.031Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.074H-atom parameters constrained
S = 1.14 w = 1/[σ2(Fo2) + (0.0342P)2 + 2.6518P]
where P = (Fo2 + 2Fc2)/3
897 reflections(Δ/σ)max = 0.001
63 parametersΔρmax = 0.48 e Å−3
0 restraintsΔρmin = −0.41 e Å−3
Crystal data top
[Ga2(C4H4O6)2(OH)2]·2H2OV = 1514.8 (5) Å3
Mr = 505.64Z = 4
Orthorhombic, IbamMo Kα radiation
a = 8.6830 (17) ŵ = 3.65 mm−1
b = 10.797 (2) ÅT = 293 K
c = 16.158 (3) Å0.3 × 0.2 × 0.15 mm
Data collection top
Rigaku R-AXIS RAPID-S
diffractometer		897 independent reflections
Absorption correction: multi-scan
(CrystalClear; Rigaku/MSC, 2002)		756 reflections with I > 2σ(I)
Tmin = 0.421, Tmax = 0.578Rint = 0.045
7524 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0310 restraints
wR(F2) = 0.074H-atom parameters constrained
S = 1.14Δρmax = 0.48 e Å−3
897 reflectionsΔρmin = −0.41 e Å−3
63 parameters
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
Ga10.50000.50000.59085 (2)0.01685 (16)
O10.3677 (2)0.42047 (17)0.67803 (11)0.0176 (4)
H20.34880.33980.67300.021*
O20.3489 (2)0.63361 (18)0.60822 (12)0.0217 (4)
O30.1354 (2)0.68818 (19)0.67612 (14)0.0290 (5)
O40.5962 (3)0.5850 (3)0.50000.0205 (6)
H40.69170.61480.50000.025*
C10.2355 (3)0.4887 (2)0.70276 (16)0.0155 (5)
H10.14230.44340.68700.019*
C20.2388 (3)0.6141 (3)0.65840 (16)0.0180 (6)
O1W0.4116 (5)0.8743 (5)0.50000.0808 (15)
H1W0.45110.83310.54280.097*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Ga10.0208 (2)0.0157 (2)0.0140 (2)−0.00133 (18)0.0000.000
O10.0212 (10)0.0105 (9)0.0212 (9)0.0016 (8)0.0037 (8)0.0014 (8)
O20.0252 (11)0.0174 (10)0.0227 (10)0.0019 (9)0.0042 (9)0.0071 (8)
O30.0280 (11)0.0176 (10)0.0414 (13)0.0065 (9)0.0058 (11)0.0068 (9)
O40.0218 (15)0.0234 (14)0.0164 (13)−0.0093 (12)0.0000.000
C10.0146 (12)0.0139 (12)0.0180 (13)−0.0004 (11)−0.0003 (11)0.0009 (11)
C20.0211 (14)0.0148 (13)0.0180 (13)0.0005 (11)−0.0037 (12)−0.0003 (10)
O1W0.048 (3)0.105 (4)0.089 (4)0.008 (3)0.0000.000
Geometric parameters (Å, º) top
Ga1—O12.0102 (19)O2—C21.271 (3)
Ga1—O21.970 (2)O3—C21.236 (3)
Ga1—O4i1.9219 (18)O4—Ga1i1.9219 (17)
Ga1—O41.9219 (18)O4—H40.8900
Ga1—O2ii1.970 (2)C1—C21.532 (4)
Ga1—O1ii2.0102 (19)C1—C1iii1.546 (5)
Ga1—Ga1i2.9358 (10)C1—H10.9800
O1—C11.421 (3)O1W—H1W0.8900
O1—H20.8900
O4i—Ga1—O480.41 (12)O1ii—Ga1—Ga1i134.49 (6)
O4i—Ga1—O2ii92.78 (10)O1—Ga1—Ga1i134.49 (6)
O4—Ga1—O2ii99.74 (10)C1—O1—Ga1115.90 (15)
O4i—Ga1—O299.74 (10)C1—O1—H2112.6
O4—Ga1—O292.78 (10)Ga1—O1—H2117.4
O2ii—Ga1—O2163.61 (11)C2—O2—Ga1118.06 (17)
O4i—Ga1—O1ii170.89 (9)Ga1i—O4—Ga199.59 (12)
O4—Ga1—O1ii94.76 (8)Ga1i—O4—H4125.3
O2ii—Ga1—O1ii80.36 (7)Ga1—O4—H4125.3
O2—Ga1—O1ii88.15 (8)O1—C1—C2108.2 (2)
O4i—Ga1—O194.76 (8)O1—C1—C1iii111.05 (17)
O4—Ga1—O1170.89 (9)C2—C1—C1iii108.8 (3)
O2ii—Ga1—O188.15 (8)O1—C1—H1109.6
O2—Ga1—O180.36 (7)C2—C1—H1109.6
O1ii—Ga1—O191.02 (11)C1iii—C1—H1109.6
O4i—Ga1—Ga1i40.20 (6)O3—C2—O2125.9 (3)
O4—Ga1—Ga1i40.20 (6)O3—C2—C1116.7 (2)
O2ii—Ga1—Ga1i98.19 (6)O2—C2—C1117.3 (2)
O2—Ga1—Ga1i98.19 (6)
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y+1, z; (iii) x, −y+1, −z+3/2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1—H2···O3iv0.891.642.509 (3)163
O4—H4···O1Wv0.891.912.774 (5)162
O1W—H1W···O20.892.563.179 (5)127
Symmetry codes: (iv) −x+1/2, y−1/2, z; (v) x+1/2, −y+3/2, z.

Experimental details

Crystal data
Chemical formula[Ga2(C4H4O6)2(OH)2]·2H2O
Mr505.64
Crystal system, space groupOrthorhombic, Ibam
Temperature (K)293
a, b, c (Å)8.6830 (17), 10.797 (2), 16.158 (3)
V (Å3)1514.8 (5)
Z4
Radiation typeMo Kα
µ (mm−1)3.65
Crystal size (mm)0.3 × 0.2 × 0.15
Data collection
DiffractometerRigaku R-AXIS RAPID-S
Absorption correctionMulti-scan
(CrystalClear; Rigaku/MSC, 2002)
Tmin, Tmax0.421, 0.578
No. of measured, independent and
observed [I > 2σ(I)] reflections		7524, 897, 756
Rint0.045
(sin θ/λ)max (Å−1)0.648
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.031, 0.074, 1.14
No. of reflections897
No. of parameters63
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.48, −0.41

Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top
Ga1—O12.0102 (19)Ga1—O41.9219 (18)
Ga1—O21.970 (2)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1—H2···O3i0.891.642.509 (3)163.0
O4—H4···O1Wii0.891.912.774 (5)162.3
O1W—H1W···O20.892.563.179 (5)127.4
Symmetry codes: (i) −x+1/2, y−1/2, z; (ii) x+1/2, −y+3/2, z.
 

Acknowledgements

This work was supported by the Program for the Natural Science Foundation of Hainan Province (grant No. 211010) and the Priming Scientific Research Foundation of Hainan University (grant No. kyqd1051).

References

First citationChen, X.-M. & Tong, M.-L. (2007). Acc. Chem. Res. 40, 162–170.  Web of Science CrossRef PubMed CAS Google Scholar
 First citationDu, M. & Bu, X.-H. (2009). Bull. Chem. Soc. Jpn, 80, 539–554.  Web of Science CrossRef Google Scholar
 First citationPan, Q. H., Cheng, Q. & Bu, X.-H. (2010). CrystEngComm, 12, 4198–4204.  Web of Science CSD CrossRef CAS Google Scholar
 First citationPan, Q. H., Cheng, Q. & Bu, X.-H. (2011). Chem. J. Chin. Univ. 32, 527–531.  CAS Google Scholar
 First citationPan, Q. H., Cheng, Q. & Hu, T.-L. (2010). Chin. J. Inorg. Chem. 26, 2299–2302.  CAS Google Scholar
 First citationPan, Q. H., Li, J. Y. & Bu, X.-H. (2010). Microporous Mesoporous Mater. 132, 453–457.  Web of Science CSD CrossRef CAS Google Scholar
 First citationPan, Q. H., Ma, H. & Hu, T.-L. (2012). J. Mol. Struct. 1011, 134–139.  Web of Science CSD CrossRef CAS Google Scholar
 First citationQiu, S.-L. & Zhu, G.-S. (2009). Coord. Chem. Rev. 253, 2891–2911.  Web of Science CrossRef CAS Google Scholar
 First citationRigaku (1998). RAPID-AUTO. Rigaku Corporation, Tokyo, Japan.  Google Scholar
 First citationRigaku/MSC (2002). CrystalClear and CrystalStructure. Rigaku/MSC Inc., USA.  Google Scholar
 First citationSheldrick, G. M. (2008). Acta Cryst. A64, 112–122.  Web of Science CrossRef CAS IUCr Journals Google Scholar
 First citationWu, Q., Wang, F., Jiang, N., Cao, L. & Pan, Q. (2011). Acta Cryst. E67, m1710–m1711.  Web of Science CSD CrossRef IUCr Journals Google Scholar
 First citationZeng, T.-F., Hu, X. & Bu, X.-H. (2009). Chem. Soc. Rev. 38, 469–480.  Web of Science CrossRef PubMed CAS Google Scholar

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Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 68| Part 7| July 2012| Pages m989-m990
https://doi.org/10.1107/S1600536812028188
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