Abstract
The title compound, [Cr2Cl2O(C18H18N4)2](PF6)2, is isostructural with the VIII analogue. Each CrIII atom is chelated by the tetradentate tris(2-pyridylmethyl)amine ligand via four N atoms, and further coordinated by one Cl atom and one bridging O atom, giving a slightly distorted octahedral coordination geometry. The dinuclear complex is centrosymmetric, with the bridging O atom lying on a centre of inversion.
Related literature
For the isostructural VIII analogue, see: Tajika et al. (2005 ▶). For more general related literature, see: Butler & Carrano (1991 ▶); Crans et al. (1989 ▶); Dey (1974 ▶); Chen & Zubieta (1990 ▶).
Experimental
Crystal data
[Cr2Cl2O(C18H18N4)2](PF6)2
M r = 1061.57
Triclinic,
a = 8.6107 (17) Å
b = 11.302 (2) Å
c = 12.798 (3) Å
α = 115.50 (3)°
β = 107.45 (3)°
γ = 91.50 (3)°
V = 1054.8 (4) Å3
Z = 1
Mo Kα radiation
μ = 0.81 mm−1
T = 293 (2) K
0.28 × 0.22 × 0.18 mm
Data collection
Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2001 ▶) T min = 0.804, T max = 0.867
8686 measured reflections
3877 independent reflections
3594 reflections with I > 2σ(I)
R int = 0.021
Refinement
R[F 2 > 2σ(F 2)] = 0.033
wR(F 2) = 0.089
S = 1.00
3877 reflections
287 parameters
H-atom parameters constrained
Δρmax = 0.51 e Å−3
Δρmin = −0.33 e Å−3
Data collection: APEX2 (Bruker, 2004 ▶); cell refinement: SAINT-Plus (Bruker, 2001 ▶); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997 ▶); molecular graphics: SHELXTL (Bruker, 2001 ▶); software used to prepare material for publication: SHELXTL.
Supplementary Material
Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536807061296/bi2257sup1.cif
Structure factors: contains datablocks I. DOI: 10.1107/S1600536807061296/bi2257Isup2.hkl
Additional supplementary materials: crystallographic information; 3D view; checkCIF report
Acknowledgments
The authors are grateful for financial support from Henan University (grant No.05YBGG013).
supplementary crystallographic information
Comment
A classical but nevertheless rapidly developing field of application for related metal-Schiff compounds is their use as catalysts in polymerization, oxidation reactions, and model examples for the interaction of metal ions within the active sites of enzymes (Butler & Carrano, 1991; Crans et al., 1989; Dey, 1974; Chen & Zubieta, 1990). In the dinuclear title compound (Fig. 1), each CrIII atom is chelated by the tetradentate ligand tris(2-pyridylmethyl)amine via four N atoms, and further coordinated by one Cl atom and one bridging O atom to give a slightly distorted octahedral coordination geometry.
Experimental
A mixture of chromium(III) trichloride (1 mmol) and tris(2-pyridylmethyl)amine (1 mmol) in 20 ml me thanol was refluxed for two hours. After cooling, the solution was filtered and the filtrate was evaporated naturally at room temperature. Blue blocks of the title compound were obtained after a few days with a yield of 31%. Elemental analysis calculated: C 40.39, H 3.35, N 10.44%; found: C 40.35, H 3.39, N 10.42%.
Refinement
All H atoms were placed in calculated positions with C—H = 0.93 or 0.97 Å and refined as riding with Uiso(H) = 1.2Ueq(C).
Figures
Fig. 1.
The molecular structure drawn with 30% probability displacement ellipsoids for the non-H atoms.
Crystal data
| [Cr2Cl2O(C18H18N4)2](PF6)2 | Z = 1 |
| Mr = 1061.57 | F000 = 536 |
| Triclinic, P1 | Dx = 1.671 Mg m−3 |
| Hall symbol: -P 1 | Mo Kα radiation λ = 0.71073 Å |
| a = 8.6107 (17) Å | Cell parameters from 3877 reflections |
| b = 11.302 (2) Å | θ = 3.0–25.5º |
| c = 12.798 (3) Å | µ = 0.81 mm−1 |
| α = 115.50 (3)º | T = 293 (2) K |
| β = 107.45 (3)º | Block, blue |
| γ = 91.50 (3)º | 0.28 × 0.22 × 0.18 mm |
| V = 1054.8 (4) Å3 |
Data collection
| Bruker APEX II CCD diffractometer | 3877 independent reflections |
| Radiation source: fine-focus sealed tube | 3594 reflections with I > 2σ(I) |
| Monochromator: graphite | Rint = 0.021 |
| T = 293(2) K | θmax = 25.5º |
| φ and ω scans | θmin = 3.0º |
| Absorption correction: multi-scan(SADABS; Bruker, 2001) | h = −8→10 |
| Tmin = 0.804, Tmax = 0.867 | k = −13→13 |
| 8686 measured reflections | l = −15→15 |
Refinement
| Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
| Least-squares matrix: full | H-atom parameters constrained |
| R[F2 > 2σ(F2)] = 0.033 | w = 1/[σ2(Fo2) + (0.0565P)2 + 0.3428P] where P = (Fo2 + 2Fc2)/3 |
| wR(F2) = 0.089 | (Δ/σ)max < 0.001 |
| S = 1.00 | Δρmax = 0.51 e Å−3 |
| 3877 reflections | Δρmin = −0.33 e Å−3 |
| 287 parameters | Extinction correction: SHELXL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
| Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.042 (3) |
| Secondary atom site location: difference Fourier map |
Special details
| 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)
| x | y | z | Uiso*/Ueq | ||
| Cr1 | 1.03745 (3) | 0.34679 (3) | 0.39271 (2) | 0.0408 (4) | |
| C1 | 0.9871 (3) | 0.1897 (2) | 0.53070 (18) | 0.0447 (4) | |
| H1 | 1.1018 | 0.1984 | 0.5573 | 0.054* | |
| C2 | 0.8992 (3) | 0.1306 (2) | 0.5741 (2) | 0.0534 (5) | |
| H2 | 0.9533 | 0.0998 | 0.6296 | 0.064* | |
| C3 | 0.7284 (3) | 0.1173 (3) | 0.5340 (2) | 0.0605 (6) | |
| H3 | 0.6662 | 0.0779 | 0.5626 | 0.073* | |
| C4 | 0.6514 (3) | 0.1630 (2) | 0.4513 (2) | 0.0552 (5) | |
| H4 | 0.5367 | 0.1537 | 0.4226 | 0.066* | |
| C5 | 0.7464 (2) | 0.22306 (19) | 0.41135 (18) | 0.0425 (4) | |
| C6 | 0.6721 (2) | 0.2874 (2) | 0.3310 (2) | 0.0490 (5) | |
| H6A | 0.5643 | 0.2353 | 0.2730 | 0.059* | |
| H6B | 0.6563 | 0.3757 | 0.3822 | 0.059* | |
| C7 | 0.7467 (3) | 0.1753 (2) | 0.1450 (2) | 0.0573 (6) | |
| H7A | 0.7443 | 0.2004 | 0.0811 | 0.069* | |
| H7B | 0.6381 | 0.1253 | 0.1216 | 0.069* | |
| C8 | 0.8712 (2) | 0.08565 (19) | 0.14924 (17) | 0.0414 (4) | |
| C9 | 0.8351 (3) | −0.0448 (2) | 0.0588 (2) | 0.0528 (5) | |
| H9 | 0.7315 | −0.0793 | −0.0028 | 0.063* | |
| C10 | 0.9546 (3) | −0.1237 (2) | 0.0606 (2) | 0.0617 (6) | |
| H10 | 0.9327 | −0.2119 | 0.0003 | 0.074* | |
| C11 | 1.1069 (3) | −0.0697 (2) | 0.1532 (2) | 0.0607 (6) | |
| H11 | 1.1894 | −0.1208 | 0.1564 | 0.073* | |
| C12 | 1.1346 (3) | 0.0605 (2) | 0.2404 (2) | 0.0526 (5) | |
| H12 | 1.2374 | 0.0964 | 0.3028 | 0.063* | |
| C13 | 0.7605 (3) | 0.4147 (2) | 0.23723 (19) | 0.0475 (5) | |
| H13A | 0.7430 | 0.4881 | 0.3059 | 0.057* | |
| H13B | 0.6651 | 0.3917 | 0.1639 | 0.057* | |
| C14 | 0.9146 (3) | 0.4574 (2) | 0.21891 (17) | 0.0471 (5) | |
| C15 | 0.9138 (4) | 0.5296 (2) | 0.1547 (2) | 0.0606 (6) | |
| H15 | 0.8154 | 0.5482 | 0.1149 | 0.073* | |
| C16 | 1.0629 (4) | 0.5734 (3) | 0.1512 (2) | 0.0728 (8) | |
| H16 | 1.0650 | 0.6237 | 0.1100 | 0.087* | |
| C17 | 1.2075 (4) | 0.5435 (3) | 0.2077 (3) | 0.0715 (7) | |
| H17 | 1.3076 | 0.5721 | 0.2047 | 0.086* | |
| C18 | 1.2007 (3) | 0.4704 (3) | 0.2686 (2) | 0.0610 (6) | |
| H18 | 1.2978 | 0.4490 | 0.3069 | 0.073* | |
| Cl1 | 1.31398 (6) | 0.35078 (6) | 0.48445 (5) | 0.05507 (17) | |
| F1 | 0.5115 (2) | 0.90789 (16) | 0.13882 (17) | 0.0825 (5) | |
| F2 | 0.4878 (2) | 0.8490 (2) | 0.27945 (15) | 0.0893 (5) | |
| F3 | 0.5830 (3) | 0.6607 (2) | 0.1912 (2) | 0.1078 (7) | |
| F4 | 0.7325 (2) | 0.8610 (2) | 0.24906 (17) | 0.0999 (6) | |
| F5 | 0.6040 (2) | 0.72005 (19) | 0.04870 (17) | 0.0929 (6) | |
| F6 | 0.36012 (19) | 0.71102 (16) | 0.08031 (14) | 0.0726 (4) | |
| N1 | 1.0192 (2) | 0.13917 (16) | 0.23969 (15) | 0.0436 (4) | |
| N2 | 1.0566 (2) | 0.42848 (18) | 0.27454 (16) | 0.0482 (4) | |
| N3 | 0.91312 (19) | 0.23567 (15) | 0.45104 (15) | 0.0406 (3) | |
| N4 | 0.7776 (2) | 0.29834 (16) | 0.26214 (15) | 0.0424 (4) | |
| O1 | 1.0000 | 0.5000 | 0.5000 | 0.0420 (4) | |
| P1 | 0.54870 (7) | 0.78424 (6) | 0.16549 (5) | 0.05276 (17) |
Atomic displacement parameters (Å2)
| U11 | U22 | U33 | U12 | U13 | U23 | |
| Cr1 | 0.0378 (11) | 0.0424 (10) | 0.0424 (10) | 0.0088 (8) | 0.0112 (8) | 0.0212 (8) |
| C1 | 0.0415 (10) | 0.0468 (10) | 0.0459 (10) | 0.0095 (8) | 0.0121 (8) | 0.0233 (8) |
| C2 | 0.0597 (14) | 0.0546 (12) | 0.0513 (12) | 0.0109 (10) | 0.0179 (10) | 0.0300 (10) |
| C3 | 0.0606 (14) | 0.0666 (14) | 0.0669 (14) | 0.0057 (11) | 0.0281 (11) | 0.0381 (12) |
| C4 | 0.0395 (11) | 0.0606 (13) | 0.0695 (14) | 0.0063 (9) | 0.0206 (10) | 0.0324 (11) |
| C5 | 0.0351 (9) | 0.0412 (9) | 0.0456 (10) | 0.0057 (7) | 0.0117 (8) | 0.0166 (8) |
| C6 | 0.0302 (9) | 0.0572 (12) | 0.0614 (12) | 0.0093 (8) | 0.0107 (8) | 0.0322 (10) |
| C7 | 0.0517 (13) | 0.0499 (12) | 0.0462 (11) | 0.0099 (9) | −0.0011 (9) | 0.0127 (9) |
| C8 | 0.0424 (10) | 0.0438 (10) | 0.0403 (9) | 0.0052 (8) | 0.0153 (8) | 0.0207 (8) |
| C9 | 0.0562 (13) | 0.0484 (11) | 0.0497 (11) | 0.0027 (9) | 0.0185 (10) | 0.0189 (9) |
| C10 | 0.0769 (17) | 0.0441 (11) | 0.0634 (14) | 0.0138 (11) | 0.0334 (13) | 0.0178 (10) |
| C11 | 0.0653 (15) | 0.0551 (13) | 0.0714 (15) | 0.0256 (11) | 0.0342 (12) | 0.0297 (11) |
| C12 | 0.0460 (12) | 0.0572 (12) | 0.0570 (12) | 0.0167 (9) | 0.0199 (10) | 0.0265 (10) |
| C13 | 0.0504 (11) | 0.0490 (11) | 0.0410 (10) | 0.0162 (9) | 0.0097 (8) | 0.0224 (9) |
| C14 | 0.0599 (13) | 0.0426 (10) | 0.0358 (9) | 0.0112 (9) | 0.0152 (9) | 0.0162 (8) |
| C15 | 0.0864 (18) | 0.0503 (12) | 0.0451 (12) | 0.0140 (11) | 0.0197 (11) | 0.0237 (10) |
| C16 | 0.114 (2) | 0.0544 (13) | 0.0572 (14) | 0.0012 (14) | 0.0362 (15) | 0.0288 (12) |
| C17 | 0.084 (2) | 0.0710 (16) | 0.0683 (16) | −0.0005 (14) | 0.0357 (14) | 0.0343 (13) |
| C18 | 0.0612 (14) | 0.0666 (14) | 0.0615 (14) | 0.0042 (11) | 0.0280 (11) | 0.0307 (12) |
| Cl1 | 0.0334 (3) | 0.0609 (3) | 0.0596 (3) | 0.0131 (2) | 0.0101 (2) | 0.0215 (2) |
| F1 | 0.0810 (11) | 0.0724 (10) | 0.0988 (12) | 0.0060 (8) | 0.0208 (9) | 0.0507 (9) |
| F2 | 0.0836 (12) | 0.1141 (14) | 0.0632 (9) | 0.0059 (10) | 0.0336 (8) | 0.0300 (9) |
| F3 | 0.1008 (15) | 0.1236 (16) | 0.163 (2) | 0.0524 (12) | 0.0641 (14) | 0.1074 (16) |
| F4 | 0.0483 (9) | 0.1549 (19) | 0.0854 (12) | −0.0063 (10) | 0.0024 (8) | 0.0605 (12) |
| F5 | 0.0973 (13) | 0.0965 (12) | 0.0873 (12) | 0.0083 (10) | 0.0563 (10) | 0.0288 (10) |
| F6 | 0.0571 (9) | 0.0710 (9) | 0.0731 (9) | −0.0042 (7) | 0.0144 (7) | 0.0248 (7) |
| N1 | 0.0425 (9) | 0.0456 (9) | 0.0444 (9) | 0.0116 (7) | 0.0164 (7) | 0.0210 (7) |
| N2 | 0.0526 (10) | 0.0497 (9) | 0.0451 (9) | 0.0087 (8) | 0.0187 (8) | 0.0231 (8) |
| N3 | 0.0348 (8) | 0.0421 (8) | 0.0447 (8) | 0.0082 (6) | 0.0125 (7) | 0.0205 (7) |
| N4 | 0.0376 (8) | 0.0442 (8) | 0.0411 (8) | 0.0101 (7) | 0.0077 (6) | 0.0195 (7) |
| O1 | 0.0384 (10) | 0.0430 (10) | 0.0424 (10) | 0.0081 (8) | 0.0119 (8) | 0.0190 (8) |
| P1 | 0.0429 (3) | 0.0665 (4) | 0.0529 (3) | 0.0075 (3) | 0.0151 (2) | 0.0321 (3) |
Geometric parameters (Å, °)
| Cr1—O1 | 1.7986 (7) | C9—H9 | 0.930 |
| Cr1—N3 | 2.1206 (18) | C10—C11 | 1.378 (4) |
| Cr1—N2 | 2.1238 (18) | C10—H10 | 0.930 |
| Cr1—N4 | 2.2370 (19) | C11—C12 | 1.370 (3) |
| Cr1—N1 | 2.2814 (19) | C11—H11 | 0.930 |
| Cr1—Cl1 | 2.3070 (9) | C12—N1 | 1.351 (3) |
| O1—Cr1i | 1.7986 (7) | C12—H12 | 0.930 |
| C1—N3 | 1.341 (3) | C13—N4 | 1.482 (3) |
| C1—C2 | 1.369 (3) | C13—C14 | 1.516 (3) |
| C1—H1 | 0.930 | C13—H13A | 0.970 |
| C2—C3 | 1.386 (4) | C13—H13B | 0.970 |
| C2—H2 | 0.930 | C14—N2 | 1.345 (3) |
| C3—C4 | 1.376 (4) | C14—C15 | 1.383 (3) |
| C3—H3 | 0.930 | C15—C16 | 1.384 (4) |
| C4—C5 | 1.382 (3) | C15—H15 | 0.930 |
| C4—H4 | 0.930 | C16—C17 | 1.371 (4) |
| C5—N3 | 1.352 (3) | C16—H16 | 0.930 |
| C5—C6 | 1.506 (3) | C17—C18 | 1.369 (4) |
| C6—N4 | 1.479 (3) | C17—H17 | 0.930 |
| C6—H6A | 0.970 | C18—N2 | 1.351 (3) |
| C6—H6B | 0.970 | C18—H18 | 0.930 |
| C7—N4 | 1.483 (3) | F1—P1 | 1.5939 (17) |
| C7—C8 | 1.499 (3) | F2—P1 | 1.5803 (18) |
| C7—H7A | 0.970 | F3—P1 | 1.582 (2) |
| C7—H7B | 0.970 | F4—P1 | 1.5859 (18) |
| C8—N1 | 1.342 (3) | F5—P1 | 1.5804 (18) |
| C8—C9 | 1.379 (3) | F6—P1 | 1.6129 (17) |
| C9—C10 | 1.380 (4) | ||
| O1—Cr1—N3 | 91.01 (5) | N1—C12—H12 | 118.5 |
| O1—Cr1—N2 | 92.46 (5) | C11—C12—H12 | 118.5 |
| N3—Cr1—N2 | 154.67 (7) | N4—C13—C14 | 110.48 (16) |
| O1—Cr1—N4 | 91.36 (6) | N4—C13—H13A | 109.6 |
| N3—Cr1—N4 | 78.03 (7) | C14—C13—H13A | 109.6 |
| N2—Cr1—N4 | 76.81 (7) | N4—C13—H13B | 109.6 |
| O1—Cr1—N1 | 166.58 (5) | C14—C13—H13B | 109.6 |
| N3—Cr1—N1 | 81.87 (7) | H13A—C13—H13B | 108.1 |
| N2—Cr1—N1 | 89.30 (7) | N2—C14—C15 | 120.7 (2) |
| N4—Cr1—N1 | 76.09 (7) | N2—C14—C13 | 116.67 (18) |
| O1—Cr1—Cl1 | 103.29 (5) | C15—C14—C13 | 122.5 (2) |
| N3—Cr1—Cl1 | 104.03 (5) | C14—C15—C16 | 118.4 (3) |
| N2—Cr1—Cl1 | 99.56 (6) | C14—C15—H15 | 120.8 |
| N4—Cr1—Cl1 | 165.11 (5) | C16—C15—H15 | 120.8 |
| N1—Cr1—Cl1 | 89.52 (6) | C17—C16—C15 | 120.8 (2) |
| N3—C1—C2 | 122.1 (2) | C17—C16—H16 | 119.6 |
| N3—C1—H1 | 118.9 | C15—C16—H16 | 119.6 |
| C2—C1—H1 | 119.0 | C16—C17—C18 | 118.2 (3) |
| C3—C2—C1 | 118.8 (2) | C16—C17—H17 | 120.9 |
| C3—C2—H2 | 120.6 | C18—C17—H17 | 120.9 |
| C1—C2—H2 | 120.6 | N2—C18—C17 | 121.8 (3) |
| C2—C3—C4 | 119.4 (2) | N2—C18—H18 | 119.1 |
| C2—C3—H3 | 120.3 | C17—C18—H18 | 119.1 |
| C4—C3—H3 | 120.3 | C12—N1—C8 | 117.79 (18) |
| C3—C4—C5 | 119.3 (2) | C12—N1—Cr1 | 126.02 (15) |
| C3—C4—H4 | 120.4 | C8—N1—Cr1 | 115.61 (13) |
| C5—C4—H4 | 120.4 | C14—N2—C18 | 120.1 (2) |
| N3—C5—C4 | 120.95 (19) | C14—N2—Cr1 | 114.45 (14) |
| N3—C5—C6 | 116.79 (18) | C18—N2—Cr1 | 124.62 (17) |
| C4—C5—C6 | 122.07 (19) | C1—N3—C5 | 119.42 (18) |
| N4—C6—C5 | 112.19 (16) | C1—N3—Cr1 | 125.22 (14) |
| N4—C6—H6A | 109.2 | C5—N3—Cr1 | 115.07 (13) |
| C5—C6—H6A | 109.2 | C6—N4—C7 | 112.30 (18) |
| N4—C6—H6B | 109.2 | C6—N4—C13 | 112.63 (16) |
| C5—C6—H6B | 109.2 | C7—N4—C13 | 109.74 (17) |
| H6A—C6—H6B | 107.9 | C6—N4—Cr1 | 105.11 (12) |
| N4—C7—C8 | 114.97 (17) | C7—N4—Cr1 | 112.78 (13) |
| N4—C7—H7A | 108.5 | C13—N4—Cr1 | 103.96 (12) |
| C8—C7—H7A | 108.5 | Cr1—O1—Cr1i | 180.0 |
| N4—C7—H7B | 108.5 | F5—P1—F3 | 90.59 (12) |
| C8—C7—H7B | 108.5 | F5—P1—F2 | 178.06 (11) |
| H7A—C7—H7B | 107.5 | F3—P1—F2 | 90.59 (13) |
| N1—C8—C9 | 122.2 (2) | F5—P1—F4 | 90.15 (11) |
| N1—C8—C7 | 117.57 (17) | F3—P1—F4 | 91.62 (13) |
| C9—C8—C7 | 120.13 (19) | F2—P1—F4 | 91.35 (11) |
| C10—C9—C8 | 119.3 (2) | F5—P1—F1 | 89.58 (11) |
| C10—C9—H9 | 120.4 | F3—P1—F1 | 179.22 (11) |
| C8—C9—H9 | 120.4 | F2—P1—F1 | 89.22 (11) |
| C11—C10—C9 | 118.9 (2) | F4—P1—F1 | 89.14 (11) |
| C11—C10—H10 | 120.5 | F5—P1—F6 | 90.19 (10) |
| C9—C10—H10 | 120.5 | F3—P1—F6 | 90.39 (12) |
| C10—C11—C12 | 118.9 (2) | F2—P1—F6 | 88.26 (10) |
| C10—C11—H11 | 120.6 | F4—P1—F6 | 177.95 (11) |
| C12—C11—H11 | 120.6 | F1—P1—F6 | 88.85 (10) |
| N1—C12—C11 | 122.9 (2) |
Symmetry codes: (i) −x+2, −y+1, −z+1.
Footnotes
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BI2257).
References
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536807061296/bi2257sup1.cif
Structure factors: contains datablocks I. DOI: 10.1107/S1600536807061296/bi2257Isup2.hkl
Additional supplementary materials: crystallographic information; 3D view; checkCIF report

