Literature DB >> 22199500

Poly[[tetra-aqua-bis-(μ(3)-imidazole-4,5-dicarboxyl-ato)tetra-kis-(μ(2)-imidazole-4,5-dicarboxyl-ato)tricobalt(II)dilutetium(III)] dihydrate].

Li-Cai Zhu1.   

Abstract

In the title compound, {[Co(3)Lu(2)(C(5)H(2)N(2)O(4))(6)(H(2)O)(4)]·2H(2)O}(n), the Lu(III) ions are seven-coordinated in a monocapped trigonal prismatic coordination geometry by six O atoms from three imidazole-4,5-dicarboxyl-ate ligands and one water O atom. The Co(II) ions are six-coordinated in a slightly distorted octa-hedral geometry and exhibit two types of coordination environments. One Co(II) ion, located on an inversion center, is coordinated by two water O atoms as well as two O atoms and two N atoms from two imidazole-4,5-dicarboxyl-ate ligands. The other Co(II) ion is bonded to four O atoms and two N atoms from four imidazole-4,5-dicarboxyl-ate ligands. These metal coordination units are connected by bridging imidazole-4,5-dicarboxyl-ate ligands, generating a three-dimensional network. The crystal structure is further stabilized by N-H⋯O, O-H⋯O, and C-H⋯O hydrogen-bonding inter-actions between the water mol-ecules and the imidazole-4,5-dicarboxyl-ate ligands.

Entities:  

Year:  2011        PMID： 22199500      PMCID： PMC3238609          DOI： 10.1107/S1600536811045764

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


Related literature

For lanthanide–transition metal heterometallic complexes with bridging multifunctional organic ligands, see: Cheng et al. (2006 ▶); Kuang et al. (2007 ▶); Sun et al. (2006 ▶); Zhu et al. (2010 ▶).

Experimental

Crystal data

[Co3Lu2(C5H2N2O4)6(H2O)4]·2H2O M = 1559.34 Triclinic, a = 7.0332 (6) Å b = 8.3468 (7) Å c = 17.8510 (15) Å α = 95.515 (1)° β = 96.786 (1)° γ = 97.195 (1)° V = 1025.84 (15) Å3 Z = 1 Mo Kα radiation μ = 6.08 mm−1 T = 296 K 0.20 × 0.18 × 0.15 mm

Data collection

Bruker APEXII area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T min = 0.308, T max = 0.402 5351 measured reflections 3642 independent reflections 3280 reflections with I > 2σ(I) R int = 0.023

Refinement

R[F 2 > 2σ(F 2)] = 0.031 wR(F 2) = 0.069 S = 1.02 3642 reflections 376 parameters 12 restraints H atoms treated by a mixture of independent and constrained refinement Δρmax = 1.38 e Å−3 Δρmin = −1.34 e Å−3 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: SHELXL97. Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811045764/pv2457sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811045764/pv2457Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
[Co3Lu2(C5H2N2O4)6(H2O)4]·2H2OZ = 1
Mr = 1559.34F(000) = 751
Triclinic, P1Dx = 2.524 Mg m−3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 7.0332 (6) ÅCell parameters from 2416 reflections
b = 8.3468 (7) Åθ = 2.3–27.1°
c = 17.8510 (15) ŵ = 6.08 mm−1
α = 95.515 (1)°T = 296 K
β = 96.786 (1)°Block, red
γ = 97.195 (1)°0.20 × 0.18 × 0.15 mm
V = 1025.84 (15) Å3
Bruker APEXII area-detector diffractometer3642 independent reflections
Radiation source: fine-focus sealed tube3280 reflections with I > 2σ(I)
graphiteRint = 0.023
φ and ω scanθmax = 25.2°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)h = −5→8
Tmin = 0.308, Tmax = 0.402k = −10→8
5351 measured reflectionsl = −19→21
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) = 0.069H atoms treated by a mixture of independent and constrained refinement
S = 1.02w = 1/[σ2(Fo2) + (0.0315P)2 + 1.6377P] where P = (Fo2 + 2Fc2)/3
3642 reflections(Δ/σ)max = 0.001
376 parametersΔρmax = 1.38 e Å−3
12 restraintsΔρmin = −1.34 e Å−3
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
Lu10.70112 (4)0.58976 (3)0.256536 (13)0.01212 (9)
Co10.38269 (11)0.06475 (9)0.42418 (4)0.01307 (17)
Co20.50001.00000.00000.0142 (2)
C10.6258 (8)0.7760 (7)0.4223 (3)0.0133 (12)
C20.7053 (8)0.6660 (7)0.4742 (3)0.0133 (12)
C30.8108 (9)0.6042 (7)0.5848 (4)0.0220 (14)
H30.85610.61150.63620.026*
C40.7216 (8)0.5032 (6)0.4657 (3)0.0103 (11)
C50.6582 (8)0.3717 (7)0.4028 (3)0.0143 (12)
C60.1022 (8)−0.2023 (7)0.3429 (3)0.0132 (12)
C70.1583 (8)−0.1024 (6)0.2827 (3)0.0134 (12)
C80.3107 (9)0.1157 (7)0.2497 (3)0.0195 (13)
H80.38980.21410.25080.023*
C90.1057 (8)−0.1066 (7)0.2054 (3)0.0138 (12)
C10−0.0137 (8)−0.2248 (7)0.1460 (3)0.0149 (12)
C110.2968 (9)0.4493 (7)0.1376 (3)0.0172 (13)
C120.3326 (8)0.5562 (7)0.0773 (3)0.0138 (12)
C130.2892 (9)0.6358 (7)−0.0373 (3)0.0189 (13)
H130.24740.6347−0.08870.023*
C140.4316 (8)0.7088 (7)0.0769 (3)0.0135 (12)
C150.5438 (8)0.8341 (7)0.1358 (3)0.0140 (12)
O10.5982 (6)0.7412 (5)0.3519 (2)0.0215 (10)
O20.5862 (6)0.9071 (4)0.4555 (2)0.0147 (8)
O30.6263 (6)0.4072 (5)0.3362 (2)0.0195 (9)
O40.6378 (6)0.2288 (4)0.4209 (2)0.0192 (9)
O50.1840 (6)−0.1529 (5)0.4094 (2)0.0200 (9)
O6−0.0193 (6)−0.3287 (5)0.3281 (2)0.0221 (10)
O7−0.1116 (6)−0.3469 (5)0.1661 (2)0.0194 (9)
O8−0.0117 (6)−0.2004 (5)0.0777 (2)0.0191 (9)
O90.4324 (6)0.4605 (5)0.1932 (2)0.0264 (10)
O100.1470 (6)0.3533 (5)0.1285 (2)0.0256 (10)
O110.5857 (6)0.8010 (5)0.2037 (2)0.0184 (9)
O120.5894 (6)0.9710 (5)0.1153 (2)0.0178 (9)
N10.7588 (7)0.7273 (6)0.5495 (3)0.0176 (11)
N20.7899 (7)0.4672 (6)0.5366 (3)0.0164 (11)
N30.2873 (7)0.0359 (5)0.3091 (3)0.0158 (11)
N40.2033 (8)0.0336 (6)0.1876 (3)0.0204 (11)
N50.2432 (7)0.5151 (6)0.0041 (3)0.0173 (11)
N60.4021 (7)0.7565 (5)0.0052 (3)0.0139 (10)
H10.801 (9)0.372 (4)0.550 (3)0.021*
H20.209 (9)0.060 (7)0.1428 (17)0.021*
H40.181 (8)0.420 (4)−0.008 (3)0.021*
O1W0.2273 (6)1.0469 (5)0.0245 (2)0.0223 (10)
H1W0.160 (8)0.965 (5)0.030 (4)0.033*
H2W0.168 (8)1.090 (7)−0.008 (3)0.033*
O2W0.8496 (7)0.3654 (5)0.2236 (3)0.0252 (10)
H3W0.826 (10)0.284 (5)0.244 (4)0.038*
H4W0.931 (8)0.351 (7)0.197 (3)0.038*
O3W0.8053 (7)0.0904 (5)0.2910 (3)0.0314 (11)
H5W0.734 (8)0.016 (7)0.260 (3)0.047*
H6W0.741 (9)0.111 (8)0.328 (3)0.047*
U11U22U33U12U13U23
Lu10.01755 (14)0.00981 (13)0.00769 (13)−0.00126 (9)−0.00124 (9)0.00199 (9)
Co10.0202 (4)0.0086 (4)0.0091 (4)0.0011 (3)−0.0020 (3)0.0002 (3)
Co20.0174 (6)0.0130 (5)0.0121 (6)0.0005 (4)0.0001 (5)0.0060 (4)
C10.016 (3)0.014 (3)0.010 (3)−0.001 (2)0.003 (2)0.006 (2)
C20.015 (3)0.015 (3)0.011 (3)0.005 (2)0.006 (2)−0.001 (2)
C30.030 (4)0.018 (3)0.017 (3)0.007 (3)−0.004 (3)−0.001 (3)
C40.011 (3)0.010 (3)0.010 (3)0.003 (2)−0.002 (2)0.004 (2)
C50.015 (3)0.013 (3)0.016 (3)0.002 (2)0.004 (2)0.003 (2)
C60.015 (3)0.014 (3)0.011 (3)0.003 (2)0.002 (2)0.003 (2)
C70.014 (3)0.010 (3)0.016 (3)0.000 (2)0.000 (2)0.003 (2)
C80.029 (4)0.013 (3)0.014 (3)−0.003 (3)−0.004 (3)0.004 (2)
C90.017 (3)0.015 (3)0.009 (3)0.002 (2)0.000 (2)0.004 (2)
C100.013 (3)0.018 (3)0.015 (3)0.006 (2)0.001 (2)0.003 (2)
C110.022 (3)0.010 (3)0.020 (3)0.003 (2)0.002 (3)0.005 (2)
C120.012 (3)0.015 (3)0.013 (3)0.001 (2)−0.002 (2)0.001 (2)
C130.022 (3)0.021 (3)0.012 (3)0.003 (3)−0.007 (3)0.002 (2)
C140.011 (3)0.015 (3)0.014 (3)0.003 (2)−0.001 (2)0.001 (2)
C150.019 (3)0.013 (3)0.009 (3)0.000 (2)0.000 (2)0.002 (2)
O10.035 (3)0.021 (2)0.009 (2)0.011 (2)−0.0023 (18)0.0024 (17)
O20.025 (2)0.0101 (19)0.0083 (19)0.0051 (17)−0.0017 (17)−0.0002 (16)
O30.031 (2)0.015 (2)0.011 (2)−0.0016 (18)−0.0005 (18)0.0032 (17)
O40.023 (2)0.011 (2)0.022 (2)−0.0015 (17)−0.0008 (19)0.0044 (17)
O50.028 (2)0.018 (2)0.011 (2)−0.0003 (18)−0.0064 (18)0.0051 (17)
O60.027 (2)0.018 (2)0.017 (2)−0.0079 (19)−0.0043 (19)0.0075 (18)
O70.025 (2)0.015 (2)0.015 (2)−0.0040 (18)0.0003 (18)−0.0023 (17)
O80.024 (2)0.022 (2)0.009 (2)−0.0009 (18)−0.0021 (18)0.0035 (17)
O90.031 (3)0.020 (2)0.023 (2)−0.0083 (19)−0.012 (2)0.0112 (19)
O100.021 (2)0.027 (2)0.026 (2)−0.006 (2)−0.003 (2)0.011 (2)
O110.033 (2)0.013 (2)0.009 (2)0.0025 (18)−0.0006 (18)0.0029 (16)
O120.025 (2)0.013 (2)0.015 (2)−0.0015 (17)−0.0017 (18)0.0090 (17)
N10.025 (3)0.017 (3)0.011 (2)0.003 (2)−0.001 (2)0.002 (2)
N20.024 (3)0.012 (2)0.014 (3)0.008 (2)−0.002 (2)0.007 (2)
N30.021 (3)0.012 (2)0.012 (2)−0.003 (2)−0.001 (2)0.000 (2)
N40.026 (3)0.024 (3)0.013 (3)0.001 (2)0.005 (2)0.011 (2)
N50.022 (3)0.013 (2)0.012 (3)−0.004 (2)−0.005 (2)−0.004 (2)
N60.017 (3)0.016 (3)0.008 (2)0.001 (2)0.002 (2)0.003 (2)
O1W0.020 (2)0.027 (3)0.023 (2)0.0045 (19)0.0031 (19)0.014 (2)
O2W0.035 (3)0.018 (2)0.026 (3)0.007 (2)0.013 (2)0.006 (2)
O3W0.042 (3)0.020 (2)0.032 (3)0.001 (2)0.014 (2)−0.001 (2)
Lu1—O92.183 (4)C7—N31.382 (7)
Lu1—O6i2.206 (4)C8—N31.320 (7)
Lu1—O32.238 (4)C8—N41.340 (8)
Lu1—O7i2.261 (4)C8—H80.9300
Lu1—O12.264 (4)C9—N41.366 (7)
Lu1—O112.270 (4)C9—C101.477 (8)
Lu1—O2W2.317 (4)C10—O81.257 (7)
Co1—N32.066 (5)C10—O71.263 (7)
Co1—O2ii2.121 (4)C11—O101.226 (7)
Co1—O52.123 (4)C11—O91.281 (7)
Co1—O2iii2.125 (4)C11—C121.486 (8)
Co1—O42.126 (4)C12—C141.374 (8)
Co1—N1ii2.147 (5)C12—N51.374 (7)
Co2—N62.077 (4)C13—N61.316 (7)
Co2—N6iv2.077 (4)C13—N51.335 (8)
Co2—O1Wiv2.092 (4)C13—H130.9300
Co2—O1W2.092 (4)C14—N61.377 (7)
Co2—O12iv2.126 (4)C14—C151.486 (7)
Co2—O122.126 (4)C15—O121.249 (6)
C1—O11.249 (6)C15—O111.278 (6)
C1—O21.272 (6)O2—Co1ii2.121 (4)
C1—C21.478 (8)O2—Co1v2.125 (4)
C2—C41.374 (7)O6—Lu1vi2.206 (4)
C2—N11.383 (7)O7—Lu1vi2.261 (4)
C3—N11.323 (8)N1—Co1ii2.147 (5)
C3—N21.344 (7)N2—H10.87 (2)
C3—H30.9300N4—H20.85 (2)
C4—N21.374 (7)N5—H40.85 (2)
C4—C51.479 (7)O1W—H1W0.80 (5)
C5—O31.256 (7)O1W—H2W0.81 (5)
C5—O41.260 (7)O2W—H3W0.81 (5)
C6—O61.258 (7)O2W—H4W0.80 (6)
C6—O51.262 (6)O3W—H5W0.86 (5)
C6—C71.481 (7)O3W—H6W0.86 (6)
C7—C91.382 (8)
O9—Lu1—O6i168.24 (15)O6—C6—C7121.6 (5)
O9—Lu1—O380.23 (15)O5—C6—C7116.0 (5)
O6i—Lu1—O389.91 (15)C9—C7—N3109.7 (5)
O9—Lu1—O7i104.39 (15)C9—C7—C6136.0 (5)
O6i—Lu1—O7i80.05 (14)N3—C7—C6114.2 (5)
O3—Lu1—O7i144.82 (15)N3—C8—N4109.9 (5)
O9—Lu1—O1103.10 (16)N3—C8—H8125.1
O6i—Lu1—O180.68 (15)N4—C8—H8125.1
O3—Lu1—O177.20 (14)N4—C9—C7103.9 (5)
O7i—Lu1—O1132.94 (14)N4—C9—C10121.1 (5)
O9—Lu1—O1180.95 (15)C7—C9—C10134.9 (5)
O6i—Lu1—O11110.81 (14)O8—C10—O7122.9 (5)
O3—Lu1—O11140.82 (15)O8—C10—C9118.6 (5)
O7i—Lu1—O1173.48 (15)O7—C10—C9118.5 (5)
O1—Lu1—O1174.08 (14)O10—C11—O9125.5 (5)
O9—Lu1—O2W88.27 (17)O10—C11—C12118.2 (5)
O6i—Lu1—O2W82.72 (17)O9—C11—C12116.1 (5)
O3—Lu1—O2W73.16 (15)C14—C12—N5104.4 (5)
O7i—Lu1—O2W72.16 (15)C14—C12—C11134.2 (5)
O1—Lu1—O2W145.87 (15)N5—C12—C11121.2 (5)
O11—Lu1—O2W139.98 (15)N6—C13—N5110.3 (5)
N3—Co1—O2ii167.15 (17)N6—C13—H13124.8
N3—Co1—O576.85 (16)N5—C13—H13124.8
O2ii—Co1—O595.95 (15)C12—C14—N6109.5 (5)
N3—Co1—O2iii112.98 (17)C12—C14—C15135.0 (5)
O2ii—Co1—O2iii76.14 (16)N6—C14—C15115.2 (5)
O5—Co1—O2iii83.14 (15)O12—C15—O11123.1 (5)
N3—Co1—O497.10 (17)O12—C15—C14116.4 (5)
O2ii—Co1—O493.03 (15)O11—C15—C14120.5 (5)
O5—Co1—O4160.66 (16)C1—O1—Lu1142.1 (4)
O2iii—Co1—O482.44 (15)C1—O2—Co1ii117.9 (3)
N3—Co1—N1ii95.80 (18)C1—O2—Co1v132.2 (4)
O2ii—Co1—N1ii76.66 (16)Co1ii—O2—Co1v103.86 (16)
O5—Co1—N1ii111.04 (17)C5—O3—Lu1144.9 (4)
O2iii—Co1—N1ii150.45 (16)C5—O4—Co1130.4 (4)
O4—Co1—N1ii87.67 (17)C6—O5—Co1117.4 (4)
N6—Co2—N6iv180.0 (2)C6—O6—Lu1vi138.2 (4)
N6—Co2—O1Wiv93.28 (18)C10—O7—Lu1vi139.6 (4)
N6iv—Co2—O1Wiv86.72 (18)C11—O9—Lu1149.6 (4)
N6—Co2—O1W86.72 (18)C15—O11—Lu1134.8 (4)
N6iv—Co2—O1W93.28 (18)C15—O12—Co2116.7 (4)
O1Wiv—Co2—O1W180.0C3—N1—C2105.8 (5)
N6—Co2—O12iv102.48 (16)C3—N1—Co1ii136.7 (4)
N6iv—Co2—O12iv77.52 (16)C2—N1—Co1ii110.0 (4)
O1Wiv—Co2—O12iv91.60 (16)C3—N2—C4107.8 (5)
O1W—Co2—O12iv88.40 (16)C3—N2—H1124 (4)
N6—Co2—O1277.52 (16)C4—N2—H1127 (4)
N6iv—Co2—O12102.48 (16)C8—N3—C7106.3 (5)
O1Wiv—Co2—O1288.40 (16)C8—N3—Co1138.1 (4)
O1W—Co2—O1291.60 (16)C7—N3—Co1115.6 (4)
O12iv—Co2—O12180.0 (2)C8—N4—C9110.2 (5)
O1—C1—O2123.3 (5)C8—N4—H2124 (4)
O1—C1—C2122.4 (5)C9—N4—H2126 (4)
O2—C1—C2114.3 (5)C13—N5—C12109.3 (5)
C4—C2—N1109.3 (5)C13—N5—H4133 (4)
C4—C2—C1133.0 (5)C12—N5—H4118 (4)
N1—C2—C1117.3 (5)C13—N6—C14106.5 (5)
N1—C3—N2111.4 (5)C13—N6—Co2138.4 (4)
N1—C3—H3124.3C14—N6—Co2113.9 (3)
N2—C3—H3124.3Co2—O1W—H1W111 (5)
C2—C4—N2105.7 (5)Co2—O1W—H2W114 (5)
C2—C4—C5133.4 (5)H1W—O1W—H2W107 (3)
N2—C4—C5120.3 (5)Lu1—O2W—H3W119 (4)
O3—C5—O4124.3 (5)Lu1—O2W—H4W133 (4)
O3—C5—C4119.3 (5)H3W—O2W—H4W108 (3)
O4—C5—C4116.4 (5)H5W—O3W—H6W107 (3)
O6—C6—O5122.4 (5)
D—H···AD—HH···AD···AD—H···A
N2—H1···O5vii0.86 (4)2.04 (4)2.900 (6)175 (5)
N2—H1···O6vii0.86 (4)2.59 (5)3.139 (6)122 (4)
O1W—H1W···O8v0.80 (5)2.04 (5)2.806 (6)161 (6)
N4—H2···O1Wiii0.85 (4)2.12 (3)2.948 (6)162 (5)
N4—H2···O100.85 (4)2.57 (6)3.016 (7)114 (4)
O1W—H2W···O8viii0.81 (5)1.94 (6)2.748 (6)174 (6)
O2W—H3W···O3W0.81 (5)1.89 (5)2.693 (6)172 (7)
N5—H4···O8ix0.85 (4)2.23 (4)3.052 (6)161 (5)
O2W—H4W···O10x0.80 (6)2.06 (6)2.851 (7)171 (6)
O3W—H5W···O11iii0.86 (5)2.06 (6)2.902 (6)166 (5)
O3W—H6W···O40.86 (6)2.10 (6)2.928 (6)163 (6)
C8—H8···O30.932.443.217 (7)141.
C8—H8···O90.932.393.190 (7)144.
C13—H13···O2Wxi0.932.423.352 (7)178.
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯AD⋯AD—H⋯A
N2—H1⋯O5i0.86 (4)2.04 (4)2.900 (6)175 (5)
N2—H1⋯O6i0.86 (4)2.59 (5)3.139 (6)122 (4)
O1W—H1W⋯O8ii0.80 (5)2.04 (5)2.806 (6)161 (6)
N4—H2⋯O1Wiii0.85 (4)2.12 (3)2.948 (6)162 (5)
N4—H2⋯O100.85 (4)2.57 (6)3.016 (7)114 (4)
O1W—H2W⋯O8iv0.81 (5)1.94 (6)2.748 (6)174 (6)
O2W—H3W⋯O3W0.81 (5)1.89 (5)2.693 (6)172 (7)
N5—H4⋯O8v0.85 (4)2.23 (4)3.052 (6)161 (5)
O2W—H4W⋯O10vi0.80 (6)2.06 (6)2.851 (7)171 (6)
O3W—H5W⋯O11iii0.86 (5)2.06 (6)2.902 (6)166 (5)
O3W—H6W⋯O40.86 (6)2.10 (6)2.928 (6)163 (6)
C8—H8⋯O30.932.443.217 (7)141
C8—H8⋯O90.932.393.190 (7)144
C13—H13⋯O2Wvii0.932.423.352 (7)178

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

  3 in total

1.  Lanthanide-transition-metal sandwich framework comprising {Cu3} cluster pillars and layered networks of {Er36} wheels.

Authors:  Jian-Wen Cheng; Jie Zhang; Shou-Tian Zheng; Man-Bo Zhang; Guo-Yu Yang
Journal:  Angew Chem Int Ed Engl       Date:  2005-12-16       Impact factor: 15.336

2.  A series of luminescent lanthanide-cadmium-organic frameworks with helical channels and tubes.

Authors:  Yan-Qiong Sun; Jie Zhang; Guo-Yu Yang
Journal:  Chem Commun (Camb)       Date:  2006-10-03       Impact factor: 6.222

3.  A short history of SHELX.

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

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