Literature DB >> 23476486

Poly[[bis-{μ2-1,2-bis-[(1H-imidazol-1-yl)meth-yl]benzene}(μ4-9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carbox-yl-ato)dicobalt(II)] dihydrate].

Xiao-Li Sheng1, Duo-Hui Xu, Bin Cai, Jian-Lan Liu.   

Abstract

The title complex, {[Co2(C18H4O10)(C14H14N4)2]·2H2O} n was synthesized from CoCl2·6H2O, 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-lic acid (H4AQTC) and 1,2-bis-[(1H-imidazol-1-yl)meth-yl]benzene (o-bix) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Co(II) atom and one o-bix ligand, as well as half an AQTC(4-) ligand and an additional solvent water mol-ecule. The Co(II) ions are tetra-hedrally surrounded by two O atoms from two AQTC(4-) anions and by two N atoms from two o-bix ligands, forming a two-dimensional coordination polymer. The solvent water mol-ecules are connected to the carboxyl-ate groups by O-H⋯O hydrogen bonds. Additional weak C-H⋯O hydrogen bonds are observed in the crystal structure.

Entities:  

Year:  2013        PMID: 23476486      PMCID: PMC3588523          DOI: 10.1107/S160053681202716X

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For general background to metal organic frameworks, see: Li et al. (1999 ▶, 2012 ▶); Cheng et al. (2010 ▶); Hong et al. (2009 ▶); Miller & Gatteschi (2011 ▶); Liu et al. (2010 ▶).

Experimental

Crystal data

[Co2(C18H4O10)(C14H14N4)2]·2H2O M = 1010.68 Triclinic, a = 9.561 (4) Å b = 10.594 (5) Å c = 12.436 (5) Å α = 107.095 (7)° β = 102.454 (6)° γ = 106.551 (6)° V = 1090.7 (8) Å3 Z = 1 Mo Kα radiation μ = 0.83 mm−1 T = 296 K 0.43 × 0.36 × 0.28 mm

Data collection

Bruker SMART CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2000 ▶) T min = 0.717, T max = 0.801 10020 measured reflections 3787 independent reflections 3411 reflections with I > 2σ(I) R int = 0.045

Refinement

R[F 2 > 2σ(F 2)] = 0.032 wR(F 2) = 0.091 S = 1.04 3787 reflections 315 parameters H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.39 e Å−3 Δρmin = −0.32 e Å−3 Data collection: SMART (Bruker, 2000 ▶); cell refinement: SAINT (Bruker, 2000 ▶); data reduction: SAINT; 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. Click here for additional data file. Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S160053681202716X/im2380sup1.cif Click here for additional data file. Structure factors: contains datablock(s) I. DOI: 10.1107/S160053681202716X/im2380Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
[Co2(C18H4O10)(C14H14N4)2]·H2OZ = 1
Mr = 1010.68F(000) = 518
Triclinic, P1Dx = 1.539 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 9.561 (4) ÅCell parameters from 5133 reflections
b = 10.594 (5) Åθ = 2.2–27.6°
c = 12.436 (5) ŵ = 0.83 mm1
α = 107.095 (7)°T = 296 K
β = 102.454 (6)°Block, red
γ = 106.551 (6)°0.43 × 0.36 × 0.28 mm
V = 1090.7 (8) Å3
Bruker SMART CCD area-detector diffractometer3787 independent reflections
Radiation source: sealed tube3411 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.045
phi and ω scansθmax = 25.0°, θmin = 1.8°
Absorption correction: multi-scan (SADABS; Bruker, 2000)h = −11→11
Tmin = 0.717, Tmax = 0.801k = −12→12
10020 measured reflectionsl = −14→14
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.032Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.091H atoms treated by a mixture of independent and constrained refinement
S = 1.04w = 1/[σ2(Fo2) + (0.0366P)2 + 0.4627P] where P = (Fo2 + 2Fc2)/3
3787 reflections(Δ/σ)max = 0.001
315 parametersΔρmax = 0.39 e Å3
0 restraintsΔρmin = −0.32 e Å3
Experimental. Anal. Calcd. for C23H18Co1N4O6: C, 54.66; H, 3.59; N, 11.09%. Found: C, 54.34; H, 3.37; N, 10.86%. FT—IR data (KBr pellets, cm-1): 3359(m), 3140(w), 3111(m), 15109(m), 1455(w), 1078(m), 754(m), 732(w), 685(m).
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.
xyzUiso*/Ueq
C10.3229 (3)0.2312 (2)−0.08418 (19)0.0307 (5)
C2−0.1263 (3)0.3036 (2)0.1570 (2)0.0329 (5)
C3−0.0113 (3)0.2767 (2)0.09487 (18)0.0301 (5)
C40.0924 (3)0.3922 (2)0.0854 (2)0.0377 (5)
H40.09020.48230.11820.045*
C50.1986 (3)0.3753 (2)0.0281 (2)0.0362 (5)
H50.26430.45330.02030.043*
C60.2080 (3)0.2425 (2)−0.01795 (18)0.0286 (5)
C70.1067 (2)0.1253 (2)−0.00744 (17)0.0258 (4)
C8−0.0065 (2)0.1415 (2)0.04555 (17)0.0262 (4)
C90.1271 (2)−0.0137 (2)−0.04162 (17)0.0263 (4)
C100.3621 (3)0.1884 (2)0.23544 (18)0.0307 (5)
H100.33230.26610.25520.037*
C110.2936 (3)0.0631 (2)0.24410 (18)0.0295 (5)
H110.20850.03800.26920.035*
C120.4870 (3)0.0555 (2)0.17763 (18)0.0302 (5)
H120.55760.02250.14950.036*
C130.3365 (3)−0.1710 (2)0.19313 (19)0.0345 (5)
H13A0.4237−0.19770.18480.041*
H13B0.2499−0.23020.12070.041*
C140.2956 (3)−0.1986 (2)0.29720 (19)0.0319 (5)
C150.1425 (3)−0.2315 (3)0.2937 (3)0.0468 (6)
H150.0691−0.23730.22790.056*
C160.0982 (4)−0.2559 (3)0.3875 (3)0.0635 (9)
H16−0.0041−0.27650.38470.076*
C170.2054 (4)−0.2496 (3)0.4845 (3)0.0601 (9)
H170.1758−0.26620.54710.072*
C180.3566 (3)−0.2188 (3)0.4884 (2)0.0442 (6)
H180.4283−0.21610.55360.053*
C190.4047 (3)−0.1913 (2)0.39615 (19)0.0305 (5)
C200.5728 (3)−0.1577 (2)0.4074 (2)0.0344 (5)
H20A0.5976−0.10980.35450.041*
H20B0.6361−0.09340.48820.041*
C210.6999 (3)−0.3245 (3)0.4543 (2)0.0467 (6)
H210.7494−0.27380.53560.056*
C220.5629 (3)0.6109 (2)0.26958 (19)0.0337 (5)
H220.50050.61170.20130.040*
C230.7029 (3)0.5502 (3)0.3882 (2)0.0494 (7)
H230.75570.49940.41720.059*
Co10.58835 (3)0.33412 (3)0.13769 (2)0.02845 (12)
N10.4836 (2)0.18355 (19)0.19274 (15)0.0304 (4)
N20.3755 (2)−0.02007 (18)0.20818 (15)0.0281 (4)
N30.6159 (2)0.50944 (18)0.27147 (16)0.0315 (4)
N40.6099 (2)−0.28740 (18)0.37783 (15)0.0299 (4)
O10.46596 (18)0.30258 (17)−0.02288 (13)0.0351 (4)
O20.2749 (2)0.16438 (19)−0.19247 (14)0.0458 (4)
O3−0.22850 (19)0.33483 (18)0.09643 (15)0.0395 (4)
O4−0.1135 (2)0.29987 (19)0.25620 (15)0.0463 (4)
O50.24715 (17)−0.02029 (16)−0.05752 (13)0.0331 (4)
O60.9984 (3)0.0915 (3)0.3137 (2)0.0614 (6)
H250.912 (6)−0.001 (6)0.285 (5)0.15 (2)*
H240.982 (5)0.161 (5)0.304 (4)0.108 (17)*
U11U22U33U12U13U23
C10.0325 (14)0.0336 (11)0.0336 (11)0.0138 (10)0.0166 (10)0.0177 (9)
C20.0306 (13)0.0294 (10)0.0355 (12)0.0101 (10)0.0150 (10)0.0060 (9)
C30.0253 (12)0.0362 (11)0.0287 (10)0.0134 (9)0.0093 (9)0.0100 (9)
C40.0377 (15)0.0327 (11)0.0452 (13)0.0163 (10)0.0185 (11)0.0115 (10)
C50.0343 (14)0.0347 (11)0.0417 (12)0.0115 (10)0.0169 (11)0.0156 (10)
C60.0246 (12)0.0375 (11)0.0260 (10)0.0129 (9)0.0095 (9)0.0131 (9)
C70.0227 (12)0.0346 (10)0.0226 (9)0.0123 (9)0.0096 (8)0.0109 (8)
C80.0236 (12)0.0342 (11)0.0235 (10)0.0129 (9)0.0097 (8)0.0111 (8)
C90.0239 (12)0.0368 (11)0.0198 (9)0.0123 (9)0.0098 (8)0.0099 (8)
C100.0369 (13)0.0357 (11)0.0288 (10)0.0204 (10)0.0158 (10)0.0147 (9)
C110.0325 (13)0.0379 (11)0.0277 (10)0.0183 (10)0.0164 (9)0.0157 (9)
C120.0330 (13)0.0370 (11)0.0299 (11)0.0175 (10)0.0166 (10)0.0164 (9)
C130.0487 (15)0.0312 (11)0.0289 (11)0.0174 (10)0.0166 (10)0.0135 (9)
C140.0412 (14)0.0271 (10)0.0342 (11)0.0156 (10)0.0180 (10)0.0144 (9)
C150.0380 (16)0.0479 (14)0.0630 (16)0.0172 (12)0.0190 (13)0.0297 (13)
C160.052 (2)0.074 (2)0.100 (2)0.0316 (16)0.0545 (19)0.0523 (19)
C170.082 (2)0.0705 (19)0.0719 (19)0.0419 (18)0.0586 (19)0.0506 (16)
C180.0666 (19)0.0486 (14)0.0380 (13)0.0318 (13)0.0300 (13)0.0252 (11)
C190.0419 (14)0.0270 (10)0.0304 (11)0.0170 (10)0.0189 (10)0.0125 (8)
C200.0415 (15)0.0262 (10)0.0347 (11)0.0146 (10)0.0132 (10)0.0081 (9)
C210.0584 (18)0.0495 (14)0.0289 (12)0.0294 (14)0.0056 (11)0.0077 (10)
C220.0423 (15)0.0307 (11)0.0283 (11)0.0150 (10)0.0114 (10)0.0105 (9)
C230.0604 (19)0.0484 (15)0.0432 (14)0.0346 (14)0.0079 (13)0.0150 (12)
Co10.0323 (2)0.02908 (17)0.03102 (17)0.01470 (14)0.01786 (14)0.01245 (13)
N10.0347 (11)0.0334 (9)0.0308 (9)0.0162 (8)0.0165 (8)0.0152 (8)
N20.0346 (11)0.0326 (9)0.0261 (8)0.0169 (8)0.0153 (8)0.0150 (7)
N30.0356 (11)0.0304 (9)0.0335 (9)0.0159 (8)0.0167 (8)0.0119 (8)
N40.0353 (11)0.0284 (9)0.0274 (9)0.0147 (8)0.0118 (8)0.0088 (7)
O10.0277 (10)0.0480 (9)0.0394 (8)0.0151 (8)0.0176 (7)0.0243 (7)
O20.0449 (11)0.0543 (10)0.0340 (9)0.0097 (9)0.0214 (8)0.0136 (8)
O30.0338 (10)0.0504 (10)0.0462 (9)0.0245 (8)0.0216 (8)0.0201 (8)
O40.0502 (12)0.0581 (11)0.0356 (9)0.0248 (9)0.0224 (8)0.0143 (8)
O50.0267 (9)0.0384 (8)0.0385 (8)0.0149 (7)0.0185 (7)0.0122 (7)
O60.0451 (14)0.0713 (15)0.0586 (13)0.0237 (12)0.0117 (10)0.0142 (11)
C1—O21.230 (3)C14—C191.398 (3)
C1—O11.283 (3)C15—C161.392 (4)
C1—C61.519 (3)C15—H150.9300
C2—O41.226 (3)C16—C171.374 (5)
C2—O31.283 (3)C16—H160.9300
C2—C31.517 (3)C17—C181.374 (4)
C3—C41.392 (3)C17—H170.9300
C3—C81.401 (3)C18—C191.400 (3)
C4—C51.382 (3)C18—H180.9300
C4—H40.9300C19—C201.509 (3)
C5—C61.391 (3)C20—N41.478 (3)
C5—H50.9300C20—H20A0.9700
C6—C71.401 (3)C20—H20B0.9700
C7—C81.408 (3)C21—C23ii1.352 (3)
C7—C91.489 (3)C21—N41.364 (3)
C8—C9i1.488 (3)C21—H210.9300
C9—O51.223 (3)C22—N31.316 (3)
C9—C8i1.488 (3)C22—N4iii1.336 (3)
C10—C111.349 (3)C22—H220.9300
C10—N11.384 (3)C23—C21iii1.352 (3)
C10—H100.9300C23—N31.376 (3)
C11—N21.380 (3)C23—H230.9300
C11—H110.9300Co1—O3iv1.9267 (17)
C12—N11.325 (3)Co1—O11.9610 (17)
C12—N21.337 (3)Co1—N32.0008 (18)
C12—H120.9300Co1—N12.0110 (18)
C13—N21.479 (3)N4—C22ii1.336 (3)
C13—C141.513 (3)O3—Co1v1.9267 (17)
C13—H13A0.9700O6—H250.99 (6)
C13—H13B0.9700O6—H240.83 (5)
C14—C151.392 (4)
O2—C1—O1124.1 (2)C17—C16—C15120.1 (3)
O2—C1—C6119.3 (2)C17—C16—H16119.9
O1—C1—C6116.41 (18)C15—C16—H16119.9
O4—C2—O3126.4 (2)C16—C17—C18119.7 (2)
O4—C2—C3121.2 (2)C16—C17—H17120.2
O3—C2—C3112.36 (19)C18—C17—H17120.2
C4—C3—C8118.88 (19)C17—C18—C19121.3 (3)
C4—C3—C2118.03 (19)C17—C18—H18119.3
C8—C3—C2123.08 (19)C19—C18—H18119.3
C5—C4—C3121.2 (2)C14—C19—C18119.0 (2)
C5—C4—H4119.4C14—C19—C20122.88 (19)
C3—C4—H4119.4C18—C19—C20118.1 (2)
C4—C5—C6120.5 (2)N4—C20—C19111.96 (18)
C4—C5—H5119.8N4—C20—H20A109.2
C6—C5—H5119.8C19—C20—H20A109.2
C5—C6—C7119.27 (19)N4—C20—H20B109.2
C5—C6—C1117.40 (19)C19—C20—H20B109.2
C7—C6—C1123.23 (19)H20A—C20—H20B107.9
C6—C7—C8120.01 (19)C23ii—C21—N4106.3 (2)
C6—C7—C9120.37 (18)C23ii—C21—H21126.9
C8—C7—C9119.38 (18)N4—C21—H21126.9
C3—C8—C7119.98 (19)N3—C22—N4iii111.6 (2)
C3—C8—C9i120.16 (18)N3—C22—H22124.2
C7—C8—C9i119.73 (18)N4iii—C22—H22124.2
O5—C9—C8i120.24 (19)C21iii—C23—N3109.5 (2)
O5—C9—C7120.15 (19)C21iii—C23—H23125.2
C8i—C9—C7119.39 (18)N3—C23—H23125.2
C11—C10—N1109.68 (19)O3iv—Co1—O194.24 (7)
C11—C10—H10125.2O3iv—Co1—N3115.00 (8)
N1—C10—H10125.2O1—Co1—N3117.63 (8)
C10—C11—N2105.96 (19)O3iv—Co1—N1119.89 (8)
C10—C11—H11127.0O1—Co1—N1111.05 (7)
N2—C11—H11127.0N3—Co1—N1100.17 (8)
N1—C12—N2111.04 (19)C12—N1—C10105.58 (17)
N1—C12—H12124.5C12—N1—Co1131.62 (14)
N2—C12—H12124.5C10—N1—Co1121.56 (14)
N2—C13—C14112.12 (16)C12—N2—C11107.74 (18)
N2—C13—H13A109.2C12—N2—C13125.85 (18)
C14—C13—H13A109.2C11—N2—C13126.09 (18)
N2—C13—H13B109.2C22—N3—C23105.27 (18)
C14—C13—H13B109.2C22—N3—Co1129.70 (16)
H13A—C13—H13B107.9C23—N3—Co1125.00 (16)
C15—C14—C19119.1 (2)C22ii—N4—C21107.31 (18)
C15—C14—C13118.1 (2)C22ii—N4—C20125.81 (19)
C19—C14—C13122.8 (2)C21—N4—C20126.87 (18)
C14—C15—C16120.7 (3)C1—O1—Co1132.29 (13)
C14—C15—H15119.6C2—O3—Co1v120.57 (14)
C16—C15—H15119.6H25—O6—H24120 (4)
O4—C2—C3—C4−107.8 (3)C17—C18—C19—C14−1.4 (4)
O3—C2—C3—C469.5 (3)C17—C18—C19—C20179.8 (2)
O4—C2—C3—C873.1 (3)C14—C19—C20—N4−100.3 (2)
O3—C2—C3—C8−109.6 (2)C18—C19—C20—N478.5 (2)
C8—C3—C4—C50.3 (4)N2—C12—N1—C100.0 (2)
C2—C3—C4—C5−178.9 (2)N2—C12—N1—Co1−167.10 (15)
C3—C4—C5—C6−2.3 (4)C11—C10—N1—C12−0.7 (2)
C4—C5—C6—C71.1 (3)C11—C10—N1—Co1168.03 (15)
C4—C5—C6—C1177.5 (2)O3iv—Co1—N1—C12−21.8 (2)
O2—C1—C6—C5−110.7 (2)O1—Co1—N1—C1286.4 (2)
O1—C1—C6—C564.2 (3)N3—Co1—N1—C12−148.5 (2)
O2—C1—C6—C765.6 (3)O3iv—Co1—N1—C10172.85 (15)
O1—C1—C6—C7−119.5 (2)O1—Co1—N1—C10−78.94 (17)
C5—C6—C7—C82.2 (3)N3—Co1—N1—C1046.09 (18)
C1—C6—C7—C8−174.02 (19)N1—C12—N2—C110.7 (2)
C5—C6—C7—C9−172.1 (2)N1—C12—N2—C13174.39 (19)
C1—C6—C7—C911.7 (3)C10—C11—N2—C12−1.0 (2)
C4—C3—C8—C73.0 (3)C10—C11—N2—C13−174.75 (19)
C2—C3—C8—C7−177.9 (2)C14—C13—N2—C12141.3 (2)
C4—C3—C8—C9i−172.8 (2)C14—C13—N2—C11−46.2 (3)
C2—C3—C8—C9i6.2 (3)N4iii—C22—N3—C23−0.5 (3)
C6—C7—C8—C3−4.3 (3)N4iii—C22—N3—Co1−178.48 (14)
C9—C7—C8—C3170.09 (19)C21iii—C23—N3—C220.2 (3)
C6—C7—C8—C9i171.61 (19)C21iii—C23—N3—Co1178.31 (18)
C9—C7—C8—C9i−14.0 (3)O3iv—Co1—N3—C22109.9 (2)
C6—C7—C9—O513.8 (3)O1—Co1—N3—C220.3 (2)
C8—C7—C9—O5−160.54 (19)N1—Co1—N3—C22−120.1 (2)
C6—C7—C9—C8i−171.68 (18)O3iv—Co1—N3—C23−67.7 (2)
C8—C7—C9—C8i14.0 (3)O1—Co1—N3—C23−177.34 (19)
N1—C10—C11—N21.1 (2)N1—Co1—N3—C2362.3 (2)
N2—C13—C14—C1588.0 (3)C23ii—C21—N4—C22ii−0.4 (3)
N2—C13—C14—C19−91.5 (3)C23ii—C21—N4—C20−179.3 (2)
C19—C14—C15—C160.5 (4)C19—C20—N4—C22ii69.5 (3)
C13—C14—C15—C16−179.1 (2)C19—C20—N4—C21−111.9 (3)
C14—C15—C16—C17−0.9 (4)O2—C1—O1—Co1−143.51 (19)
C15—C16—C17—C180.2 (5)C6—C1—O1—Co141.9 (3)
C16—C17—C18—C191.0 (4)O3iv—Co1—O1—C1144.39 (19)
C15—C14—C19—C180.6 (3)N3—Co1—O1—C1−94.5 (2)
C13—C14—C19—C18−179.8 (2)N1—Co1—O1—C120.1 (2)
C15—C14—C19—C20179.4 (2)O4—C2—O3—Co1v−16.1 (3)
C13—C14—C19—C20−1.1 (3)C3—C2—O3—Co1v166.74 (14)
D—H···AD—HH···AD···AD—H···A
O6—H24···O4iv0.83 (5)2.10 (5)2.911 (4)166 (5)
O6—H25···O2vi0.99 (6)1.92 (6)2.883 (4)164 (5)
C11—H11···O6v0.932.373.192 (4)148
C12—H12···O5vi0.932.393.268 (4)157
C13—H13A···O1vi0.972.583.389 (4)141
C13—H13B···O3i0.972.543.278 (3)133
C20—H20A···O2vi0.972.583.301 (3)131
C21—H21···O6vii0.932.523.302 (4)143
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
O6—H24⋯O4i 0.83 (5)2.10 (5)2.911 (4)166 (5)
O6—H25⋯O2ii 0.99 (6)1.92 (6)2.883 (4)164 (5)
C11—H11⋯O6iii 0.932.373.192 (4)148
C12—H12⋯O5ii 0.932.393.268 (4)157
C13—H13A⋯O1ii 0.972.583.389 (4)141
C13—H13B⋯O3iv 0.972.543.278 (3)133
C20—H20A⋯O2ii 0.972.583.301 (3)131
C21—H21⋯O6v 0.932.523.302 (4)143

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) .

  3 in total

Review 1.  Metal-organic frameworks for separations.

Authors:  Jian-Rong Li; Julian Sculley; Hong-Cai Zhou
Journal:  Chem Rev       Date:  2011-10-06       Impact factor: 60.622

2.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

3.  Molecule-based magnets.

Authors:  Joel S Miller; Dante Gatteschi
Journal:  Chem Soc Rev       Date:  2011-05-09       Impact factor: 54.564

  3 in total

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