(2,2′-Bipyridyl-κ2N,N′)tetra­kis(4-methyl­benzoato-κO)manganese(II)

Song, W.-D.; Wang, H.; Ma, D.-Y.

doi:10.1107/S160053680800994X

metal-organic compounds

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 64| Part 5| May 2008| Page m677

doi:10.1107/S160053680800994X

Open

access

(2,2′-Bipyridyl-κ²N,N′)tetrakis(4-methylbenzoato-κO)manganese(II)

Wen-Dong Song,^a ^* Hao Wang ^a and De-Yun Ma ^b

^aCollege of Science, Guang Dong Ocean University, Zhan Jiang 524088, People's Republic of China, and ^bCollege of Chemistry, South China University of Technology, Guangzhou 510640, People's Republic of China
^*Correspondence e-mail: songwd60@126.com

(Received 26 March 2008; accepted 11 April 2008; online 16 April 2008)

In the title mononuclear complex, [Mn(C₈H₇O₂)₄(C₁₀H₈N₂)], the Mn^II atom lies on a twofold rotation axis and has a distorted octahedral coordination geometry defined by four O atoms from four 4-methylbenzoate ligands and two N atoms from one 2,2′-bipyridyl ligand. The crystal structure is stabilized by intermolecular hydrogen bonds and π–π stacking interactions [the centroid–centroid distance between the parallel pyridyl ring of a 2,2′-bipyridyl and benzene ring of a 4-methylbenzoic group of a neighboring complex is 3.839 (2) Å].

Related literature

For related literature, see: Song et al. (2007 ).

Experimental

Crystal data

[Mn(C₈H₇O₂)₄(C₁₀H₈N₂)]
M_r = 753.68
Orthorhombic, P c c n
a = 13.6159 (2) Å
b = 14.2585 (2) Å
c = 19.5732 (3) Å
V = 3799.99 (10) Å³
Z = 4
Mo Kα radiation
μ = 0.40 mm⁻¹
T = 273 (2) K
0.20 × 0.16 × 0.11 mm

Data collection

Bruker APEXII area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.93, T_max = 0.96
30915 measured reflections
4378 independent reflections
2297 reflections with I > 2σ(I)
R_int = 0.070

Refinement

R[F² > 2σ(F²)] = 0.047
wR(F²) = 0.131
S = 1.01
4378 reflections
243 parameters
H-atom parameters constrained
Δρ_max = 0.22 e Å⁻³
Δρ_min = −0.24 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O4—H4A⋯O2ⁱ	0.82	1.68	2.477 (2)	164
Symmetry code: (i) $[-x+{\script{3\over 2}}, -y+{\script{1\over 2}}, z]$ .

Data collection: APEX2 (Bruker, 2004 ); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S160053680800994X/bg2175sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S160053680800994X/bg2175Isup2.hkl

checkCIF report

Comment top

In the structural investigation of 4-methylbenzate complexes, it has been found that the 4-methylbenzoic acid functions as a multidentate ligand [Song et al. (2007)], with versatile binding and coordination modes. In this paper, we report the crystal structure of the title compound, (I), a new Mn complex obtained by the reaction of 4-methylbenzoic acid, 2,2'-bipyridyl and manganese chloride in alkaline aqueous solution.

As illustrated in Figure 1, the Mn^II atom lies on a centre of symmetry, and is surrounded by distorted octahedral environment defined by four carboxyl O atoms from four monodentate 4-methylbenzate ligands and two N atoms from one 2,2'-bipyridyl ligand. The packing is governed by a O—H···O hydrogen bond (Table 1) and a weak π-π stacking interaction between the parallel pyridyl ring of a 2,2'-bipyridyl and a phenyl ring of 4-methylbenzoic group of neighboring complexes (1.5-x, 0.5-y, z), with a centroid to centroid distance of 3.839 (2) Å.

Related literature top

For related literature, see: Song et al. (2007).

Experimental top

A mixture of manganese chloride(1 mmol), 4-methylbenzoic acid (1 mmol), 2,2'-bipyridyl(1 mmol), NaOH (1.5 mmol) and H₂O (12 ml) was placed in a 23 ml Teflon reactor, which was heated to 433 K for three days and then cooled to room temperature at a rate of 10 K h^-1. The crystals obtained were washed with water and dryed in air.

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

Fig. 1. The structure of (I), showing the atomic numbering scheme. Non-H atoms are shown as 30% probability displacement ellipsoids.

(2,2'-Bipyridyl-κ²N,N')tetrakis(4-methylbenzoato-κO)manganese(II) top

Crystal data top

[Mn(C₈H₇O₂)₄(C₁₀H₈N₂)]	F(000) = 1572
M_r = 753.68	D_x = 1.317 Mg m⁻³
Orthorhombic, Pccn	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ab 2ac	Cell parameters from 3500 reflections
a = 13.6159 (2) Å	θ = 1.4–28.0°
b = 14.2585 (2) Å	µ = 0.40 mm⁻¹
c = 19.5732 (3) Å	T = 273 K
V = 3799.99 (10) Å³	Block, colourless
Z = 4	0.20 × 0.16 × 0.11 mm

Data collection top

Bruker APEXII area-detector diffractometer	4378 independent reflections
Radiation source: fine-focus sealed tube	2297 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.071
ϕ and ω scans	θ_max = 27.5°, θ_min = 2.1°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −17→17
T_min = 0.93, T_max = 0.96	k = −18→18
30915 measured reflections	l = −25→25

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.047	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.131	H-atom parameters constrained
S = 1.01	w = 1/[σ²(F_o²) + (0.0559P)² + 0.3551P] where P = (F_o² + 2F_c²)/3
4378 reflections	(Δ/σ)_max = 0.002
243 parameters	Δρ_max = 0.22 e Å⁻³
0 restraints	Δρ_min = −0.24 e Å⁻³

Crystal data top

[Mn(C₈H₇O₂)₄(C₁₀H₈N₂)]	V = 3799.99 (10) Å³
M_r = 753.68	Z = 4
Orthorhombic, Pccn	Mo Kα radiation
a = 13.6159 (2) Å	µ = 0.40 mm⁻¹
b = 14.2585 (2) Å	T = 273 K
c = 19.5732 (3) Å	0.20 × 0.16 × 0.11 mm

Data collection top

Bruker APEXII area-detector diffractometer	4378 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2297 reflections with I > 2σ(I)
T_min = 0.93, T_max = 0.96	R_int = 0.071
30915 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.047	0 restraints
wR(F²) = 0.131	H-atom parameters constrained
S = 1.01	Δρ_max = 0.22 e Å⁻³
4378 reflections	Δρ_min = −0.24 e Å⁻³
243 parameters

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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

	x	y	z	U_iso*/U_eq
C1	0.8584 (2)	0.14977 (18)	0.04194 (12)	0.0562 (7)
C2	0.95641 (18)	0.13966 (17)	0.00816 (12)	0.0540 (6)
C3	1.0397 (2)	0.17677 (19)	0.03729 (13)	0.0653 (7)
H3	1.0347	0.2093	0.0783	0.078*
C4	1.1305 (2)	0.1667 (2)	0.00678 (15)	0.0748 (8)
H4	1.1858	0.1922	0.0276	0.090*
C5	1.1402 (2)	0.1191 (2)	−0.05468 (15)	0.0687 (8)
C6	1.0571 (2)	0.0818 (2)	−0.08347 (14)	0.0721 (8)
H6	1.0621	0.0485	−0.1242	0.087*
C7	0.9662 (2)	0.09274 (19)	−0.05331 (13)	0.0662 (7)
H7	0.9108	0.0682	−0.0746	0.079*
C8	1.2399 (2)	0.1071 (3)	−0.08752 (16)	0.0941 (11)
H8A	1.2416	0.0489	−0.1122	0.141*
H8B	1.2896	0.1066	−0.0528	0.141*
H8C	1.2517	0.1581	−0.1185	0.141*
C9	0.9071 (2)	0.39242 (17)	0.11458 (13)	0.0563 (7)
C10	1.01048 (19)	0.40889 (18)	0.13322 (12)	0.0532 (6)
C11	1.0399 (2)	0.3921 (2)	0.19970 (13)	0.0752 (8)
H11	0.9946	0.3709	0.2317	0.090*
C12	1.1359 (2)	0.4068 (3)	0.21850 (15)	0.0940 (11)
H12	1.1546	0.3943	0.2633	0.113*
C13	1.2057 (2)	0.4397 (3)	0.17272 (15)	0.0834 (9)
C14	1.1752 (2)	0.4553 (2)	0.10613 (14)	0.0757 (8)
H14	1.2203	0.4767	0.0740	0.091*
C15	1.07983 (19)	0.4399 (2)	0.08677 (13)	0.0645 (7)
H15	1.0614	0.4504	0.0417	0.077*
C16	1.3096 (2)	0.4584 (4)	0.19472 (18)	0.1358 (17)
H16A	1.3107	0.4735	0.2425	0.204*
H16B	1.3356	0.5101	0.1690	0.204*
H16C	1.3489	0.4036	0.1867	0.204*
C17	0.9252 (2)	0.1655 (2)	0.25483 (13)	0.0669 (8)
H17	0.9504	0.1479	0.2126	0.080*
C18	0.9816 (2)	0.1503 (2)	0.31183 (14)	0.0731 (8)
H18	1.0436	0.1235	0.3081	0.088*
C19	0.9451 (2)	0.1753 (2)	0.37414 (14)	0.0765 (9)
H19	0.9820	0.1665	0.4136	0.092*
C20	0.8529 (2)	0.2136 (2)	0.37739 (13)	0.0683 (8)
H20	0.8262	0.2297	0.4195	0.082*
C21	0.79986 (17)	0.22837 (15)	0.31865 (11)	0.0482 (6)
Mn1	0.7500	0.2500	0.16384 (2)	0.05147 (19)
N1	0.83575 (14)	0.20438 (14)	0.25699 (9)	0.0528 (5)
O2	0.78417 (13)	0.12153 (14)	0.00966 (9)	0.0733 (6)
O3	0.84470 (13)	0.37396 (13)	0.15885 (8)	0.0639 (5)
O4	0.88686 (13)	0.39944 (15)	0.04991 (9)	0.0709 (5)
H4A	0.8276	0.3932	0.0442	0.106*
O5	0.85649 (12)	0.18654 (14)	0.10029 (8)	0.0678 (5)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0513 (17)	0.0700 (18)	0.0472 (14)	−0.0002 (14)	0.0052 (13)	0.0032 (12)
C2	0.0490 (16)	0.0645 (16)	0.0486 (13)	−0.0017 (13)	0.0049 (13)	−0.0004 (12)
C3	0.0604 (19)	0.0755 (19)	0.0600 (16)	−0.0043 (15)	0.0059 (14)	−0.0106 (13)
C4	0.0501 (18)	0.096 (2)	0.078 (2)	−0.0066 (16)	0.0084 (15)	−0.0094 (17)
C5	0.0552 (19)	0.085 (2)	0.0658 (17)	0.0056 (16)	0.0149 (15)	0.0032 (15)
C6	0.070 (2)	0.087 (2)	0.0592 (16)	0.0016 (17)	0.0170 (16)	−0.0097 (14)
C7	0.0585 (19)	0.085 (2)	0.0555 (15)	−0.0070 (15)	0.0102 (14)	−0.0086 (14)
C8	0.064 (2)	0.125 (3)	0.093 (2)	0.0086 (19)	0.0257 (18)	0.0028 (19)
C9	0.0590 (18)	0.0595 (16)	0.0503 (15)	−0.0025 (14)	−0.0041 (14)	0.0003 (12)
C10	0.0432 (16)	0.0671 (17)	0.0493 (14)	−0.0028 (13)	−0.0035 (12)	0.0007 (12)
C11	0.061 (2)	0.109 (2)	0.0553 (17)	−0.0080 (17)	−0.0025 (15)	0.0113 (15)
C12	0.069 (2)	0.158 (3)	0.0550 (17)	−0.010 (2)	−0.0133 (17)	0.0166 (19)
C13	0.0523 (19)	0.131 (3)	0.0671 (19)	−0.0014 (19)	−0.0081 (16)	0.0071 (17)
C14	0.0509 (18)	0.115 (2)	0.0611 (17)	−0.0078 (17)	0.0002 (15)	0.0089 (15)
C15	0.0491 (17)	0.089 (2)	0.0557 (15)	−0.0053 (15)	−0.0029 (14)	0.0112 (13)
C16	0.053 (2)	0.262 (5)	0.093 (3)	−0.020 (3)	−0.016 (2)	0.023 (3)
C17	0.0578 (18)	0.087 (2)	0.0556 (16)	0.0139 (16)	0.0053 (14)	−0.0018 (13)
C18	0.0575 (18)	0.093 (2)	0.0689 (18)	0.0218 (16)	−0.0041 (16)	0.0050 (15)
C19	0.066 (2)	0.106 (2)	0.0577 (17)	0.0165 (18)	−0.0163 (15)	0.0040 (15)
C20	0.068 (2)	0.091 (2)	0.0464 (15)	0.0106 (17)	−0.0047 (14)	−0.0017 (13)
C21	0.0472 (15)	0.0535 (15)	0.0438 (12)	−0.0031 (11)	−0.0006 (11)	−0.0001 (10)
Mn1	0.0442 (3)	0.0715 (4)	0.0387 (3)	−0.0011 (3)	0.000	0.000
N1	0.0456 (13)	0.0664 (13)	0.0463 (11)	0.0021 (11)	0.0025 (10)	0.0006 (9)
O2	0.0498 (12)	0.1187 (16)	0.0513 (10)	−0.0112 (11)	0.0035 (9)	−0.0116 (10)
O3	0.0559 (12)	0.0845 (13)	0.0513 (10)	−0.0149 (10)	0.0057 (9)	−0.0031 (9)
O4	0.0500 (12)	0.1085 (15)	0.0542 (11)	−0.0087 (11)	−0.0051 (9)	0.0123 (10)
O5	0.0533 (11)	0.0962 (14)	0.0540 (11)	0.0019 (10)	0.0080 (9)	−0.0174 (9)

Geometric parameters (Å, º) top

C1—O5	1.257 (3)	C13—C14	1.386 (4)
C1—O2	1.258 (3)	C13—C16	1.503 (4)
C1—C2	1.496 (3)	C14—C15	1.371 (3)
C2—C3	1.375 (3)	C14—H14	0.9300
C2—C7	1.383 (3)	C15—H15	0.9300
C3—C4	1.381 (3)	C16—H16A	0.9600
C3—H3	0.9300	C16—H16B	0.9600
C4—C5	1.388 (4)	C16—H16C	0.9600
C4—H4	0.9300	C17—N1	1.339 (3)
C5—C6	1.371 (4)	C17—C18	1.372 (3)
C5—C8	1.512 (4)	C17—H17	0.9300
C6—C7	1.380 (3)	C18—C19	1.364 (4)
C6—H6	0.9300	C18—H18	0.9300
C7—H7	0.9300	C19—C20	1.370 (3)
C8—H8A	0.9600	C19—H19	0.9300
C8—H8B	0.9600	C20—C21	1.374 (3)
C8—H8C	0.9600	C20—H20	0.9300
C9—O3	1.242 (3)	C21—N1	1.346 (3)
C9—O4	1.300 (3)	C21—C21ⁱ	1.491 (5)
C9—C10	1.472 (3)	Mn1—O5ⁱ	2.1139 (16)
C10—C11	1.382 (3)	Mn1—O5	2.1139 (16)
C10—C15	1.383 (3)	Mn1—O3ⁱ	2.1900 (18)
C11—C12	1.374 (4)	Mn1—O3	2.1900 (18)
C11—H11	0.9300	Mn1—N1	2.2607 (19)
C12—C13	1.388 (4)	Mn1—N1ⁱ	2.2607 (19)
C12—H12	0.9300	O4—H4A	0.8200

O5—C1—O2	125.0 (2)	C14—C15—C10	121.1 (2)
O5—C1—C2	117.4 (2)	C14—C15—H15	119.4
O2—C1—C2	117.6 (2)	C10—C15—H15	119.4
C3—C2—C7	117.9 (2)	C13—C16—H16A	109.5
C3—C2—C1	121.0 (2)	C13—C16—H16B	109.5
C7—C2—C1	121.1 (2)	H16A—C16—H16B	109.5
C2—C3—C4	121.3 (2)	C13—C16—H16C	109.5
C2—C3—H3	119.4	H16A—C16—H16C	109.5
C4—C3—H3	119.4	H16B—C16—H16C	109.5
C3—C4—C5	120.7 (3)	N1—C17—C18	123.3 (2)
C3—C4—H4	119.6	N1—C17—H17	118.4
C5—C4—H4	119.6	C18—C17—H17	118.4
C6—C5—C4	117.9 (3)	C19—C18—C17	118.8 (3)
C6—C5—C8	121.5 (3)	C19—C18—H18	120.6
C4—C5—C8	120.6 (3)	C17—C18—H18	120.6
C5—C6—C7	121.4 (3)	C18—C19—C20	118.6 (2)
C5—C6—H6	119.3	C18—C19—H19	120.7
C7—C6—H6	119.3	C20—C19—H19	120.7
C6—C7—C2	120.9 (3)	C19—C20—C21	120.3 (2)
C6—C7—H7	119.6	C19—C20—H20	119.9
C2—C7—H7	119.6	C21—C20—H20	119.9
C5—C8—H8A	109.5	N1—C21—C20	121.3 (2)
C5—C8—H8B	109.5	N1—C21—C21ⁱ	115.82 (13)
H8A—C8—H8B	109.5	C20—C21—C21ⁱ	122.83 (16)
C5—C8—H8C	109.5	O5ⁱ—Mn1—O5	107.91 (10)
H8A—C8—H8C	109.5	O5ⁱ—Mn1—O3ⁱ	85.14 (7)
H8B—C8—H8C	109.5	O5—Mn1—O3ⁱ	91.85 (7)
O3—C9—O4	123.4 (2)	O5ⁱ—Mn1—O3	91.85 (7)
O3—C9—C10	121.0 (2)	O5—Mn1—O3	85.14 (7)
O4—C9—C10	115.6 (2)	O3ⁱ—Mn1—O3	174.89 (9)
C11—C10—C15	118.4 (2)	O5ⁱ—Mn1—N1	162.18 (7)
C11—C10—C9	118.8 (2)	O5—Mn1—N1	89.84 (7)
C15—C10—C9	122.7 (2)	O3ⁱ—Mn1—N1	96.19 (7)
C12—C11—C10	120.1 (3)	O3—Mn1—N1	87.94 (7)
C12—C11—H11	120.0	O5ⁱ—Mn1—N1ⁱ	89.84 (7)
C10—C11—H11	120.0	O5—Mn1—N1ⁱ	162.18 (7)
C11—C12—C13	122.0 (3)	O3ⁱ—Mn1—N1ⁱ	87.94 (7)
C11—C12—H12	119.0	O3—Mn1—N1ⁱ	96.19 (7)
C13—C12—H12	119.0	N1—Mn1—N1ⁱ	72.48 (10)
C14—C13—C12	117.1 (3)	C17—N1—C21	117.6 (2)
C14—C13—C16	121.5 (3)	C17—N1—Mn1	124.29 (15)
C12—C13—C16	121.3 (3)	C21—N1—Mn1	117.55 (15)
C15—C14—C13	121.2 (3)	C9—O3—Mn1	127.24 (16)
C15—C14—H14	119.4	C9—O4—H4A	109.5
C13—C14—H14	119.4	C1—O5—Mn1	136.66 (17)

Symmetry code: (i) −x+3/2, −y+1/2, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O4—H4A···O2ⁱ	0.82	1.68	2.477 (2)	164

Symmetry code: (i) −x+3/2, −y+1/2, z.

Experimental details

Crystal data
Chemical formula	[Mn(C₈H₇O₂)₄(C₁₀H₈N₂)]
M_r	753.68
Crystal system, space group	Orthorhombic, Pccn
Temperature (K)	273
a, b, c (Å)	13.6159 (2), 14.2585 (2), 19.5732 (3)
V (Å³)	3799.99 (10)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	0.40
Crystal size (mm)	0.20 × 0.16 × 0.11

Data collection
Diffractometer	Bruker APEXII area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.93, 0.96
No. of measured, independent and observed [I > 2σ(I)] reflections	30915, 4378, 2297
R_int	0.071
(sin θ/λ)_max (Å⁻¹)	0.650

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.047, 0.131, 1.01
No. of reflections	4378
No. of parameters	243
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.22, −0.24

Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O4—H4A···O2ⁱ	0.82	1.68	2.477 (2)	164.0

Symmetry code: (i) −x+3/2, −y+1/2, z.

Acknowledgements

The authors thank Guang Dong Ocean University for supporting this study.

References

Bruker (2004). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Song, W.-D., Gu, C.-S., Hao, X.-M. & Liu, J.-W. (2007). Acta Cryst. E63, m1023–m1024. Web of Science CSD CrossRef CAS IUCr Journals Google Scholar

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 64| Part 5| May 2008| Page m677

doi:10.1107/S160053680800994X

Open

access