Literature DB >> 21583356

trans-Di-μ-carbonyl-bis-{carbon-yl[η-2,3,4,5-tetra-methyl-1-(2-thien-yl)cyclo-penta-dien-yl]ruthenium(I)}(Ru-Ru).

Zhi-Hong Ma, Gui-Ying Dong, Xiao-Huan Liu, Jin Lin.   

Abstract

The title compound, [Ru(2)(C(13)H(15)S)(2)(CO)(4)], is a centrosymmetric binuclear metal-carbonyl complex containing an Ru-Ru single bond [2.7511 (8) Å]. Each Ru(I) atom is coordinated by two bridging carbonyl ligands, one terminal carbonyl ligand and one η(5)-cyclo-penta-dienyl group. The complex has a trans conformation and the two cyclo-penta-dienyl ring planes are parallel. The crystal structure involves weak C-H⋯O hydrogen bonds.

Entities:  

Year:  2009        PMID: 21583356      PMCID: PMC2977155          DOI: 10.1107/S1600536809026063

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


Related literature

For general background to substituted cyclo­penta­dien­yl–metal complexes, see: Arndt (2002 ▶); Bailey et al. (1978 ▶); King (1976 ▶); Möhring & Coville (2006 ▶). For the crystal structures of related ruthenium complexes, see: Schumann et al. (2002 ▶).

Experimental

Crystal data

[Ru2(C13H15S)2(CO)4] M = 720.82 Triclinic, a = 8.269 (2) Å b = 8.899 (3) Å c = 10.056 (3) Å α = 81.826 (4)° β = 76.083 (5)° γ = 82.876 (5)° V = 707.9 (4) Å3 Z = 1 Mo Kα radiation μ = 1.25 mm−1 T = 273 K 0.15 × 0.12 × 0.10 mm

Data collection

Bruker SMART APEX CCD diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T min = 0.835, T max = 0.885 3667 measured reflections 2493 independent reflections 2431 reflections with I > 2σ(I) R int = 0.016

Refinement

R[F 2 > 2σ(F 2)] = 0.027 wR(F 2) = 0.100 S = 1.03 2493 reflections 173 parameters H-atom parameters constrained Δρmax = 0.53 e Å−3 Δρmin = −0.63 e Å−3 Data collection: SMART (Bruker, 2007 ▶); cell refinement: SAINT (Bruker, 2007 ▶); 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. Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809026063/hy2205sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536809026063/hy2205Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
[Ru2(C13H15S)2(CO)4]Z = 1
Mr = 720.82F(000) = 362
Triclinic, P1Dx = 1.691 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 8.269 (2) ÅCell parameters from 1002 reflections
b = 8.899 (3) Åθ = 4.5–22.2°
c = 10.056 (3) ŵ = 1.25 mm1
α = 81.826 (4)°T = 273 K
β = 76.083 (5)°Block, red
γ = 82.876 (5)°0.15 × 0.12 × 0.10 mm
V = 707.9 (4) Å3
Bruker SMART APEX CCD diffractometer2493 independent reflections
Radiation source: fine-focus sealed tube2431 reflections with I > 2σ(I)
graphiteRint = 0.016
φ and ω scansθmax = 25.1°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)h = −9→9
Tmin = 0.835, Tmax = 0.885k = −10→10
3667 measured reflectionsl = −11→9
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.027H-atom parameters constrained
wR(F2) = 0.100w = 1/[σ2(Fo2) + (0.09P)2 + 0.0001P] where P = (Fo2 + 2Fc2)/3
S = 1.03(Δ/σ)max < 0.001
2493 reflectionsΔρmax = 0.53 e Å3
173 parametersΔρmin = −0.63 e Å3
0 restraintsExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.026 (3)
xyzUiso*/Ueq
Ru1−0.01450 (2)0.40733 (2)0.623212 (18)0.02438 (17)
S10.40230 (13)0.12210 (13)0.86000 (11)0.0622 (3)
O1−0.1870 (5)0.1684 (4)0.5431 (3)0.0836 (10)
O20.2945 (3)0.3491 (3)0.4011 (3)0.0510 (6)
C10.1653 (3)0.4142 (3)0.4472 (3)0.0314 (6)
C2−0.1213 (4)0.2620 (4)0.5688 (3)0.0440 (8)
C30.1390 (3)0.2962 (3)0.7731 (3)0.0298 (6)
C40.1719 (3)0.4517 (3)0.7456 (3)0.0302 (6)
C50.0180 (4)0.5430 (3)0.7921 (3)0.0327 (6)
C6−0.1104 (4)0.4436 (3)0.8499 (3)0.0337 (6)
C7−0.0383 (4)0.2915 (4)0.8363 (3)0.0319 (6)
C80.2643 (4)0.1630 (3)0.7537 (3)0.0329 (6)
C90.2855 (4)0.0553 (4)0.6641 (4)0.0452 (8)
H90.22170.05500.59960.054*
C100.4219 (5)−0.0577 (4)0.6847 (5)0.0606 (10)
H100.4556−0.13930.63280.073*
C110.4936 (5)−0.0364 (5)0.7814 (5)0.0657 (11)
H110.5834−0.09920.80500.079*
C120.3402 (4)0.5088 (4)0.6853 (3)0.0423 (7)
H12A0.32760.60350.62800.063*
H12B0.41040.43520.63080.063*
H12C0.39050.52440.75830.063*
C13−0.0043 (5)0.7128 (4)0.7947 (4)0.0500 (8)
H13A−0.02940.73520.88850.075*
H13B−0.09460.75580.75230.075*
H13C0.09700.75580.74490.075*
C14−0.2858 (4)0.4923 (5)0.9167 (3)0.0504 (9)
H14A−0.35390.40980.92590.076*
H14B−0.32720.57830.86100.076*
H14C−0.29000.52021.00630.076*
C15−0.1239 (4)0.1515 (4)0.8928 (3)0.0439 (8)
H15A−0.12400.12820.98900.066*
H15B−0.06610.06810.84430.066*
H15C−0.23720.16770.88180.066*
U11U22U33U12U13U23
Ru10.0253 (2)0.0278 (2)0.0202 (2)−0.00256 (12)−0.00515 (12)−0.00352 (12)
S10.0550 (6)0.0681 (7)0.0699 (7)0.0124 (5)−0.0345 (5)−0.0105 (5)
O10.121 (3)0.074 (2)0.071 (2)−0.060 (2)−0.0269 (19)−0.0075 (16)
O20.0391 (13)0.0660 (17)0.0375 (13)0.0190 (12)−0.0024 (10)−0.0029 (11)
C10.0284 (14)0.0381 (15)0.0274 (14)0.0025 (11)−0.0075 (11)−0.0057 (12)
C20.056 (2)0.0469 (18)0.0334 (17)−0.0202 (16)−0.0128 (14)−0.0008 (14)
C30.0289 (14)0.0367 (14)0.0258 (14)−0.0035 (11)−0.0108 (11)−0.0023 (11)
C40.0323 (14)0.0360 (15)0.0242 (13)−0.0065 (11)−0.0093 (11)−0.0020 (11)
C50.0397 (15)0.0379 (16)0.0235 (14)0.0006 (12)−0.0123 (11)−0.0088 (12)
C60.0344 (15)0.0460 (17)0.0212 (13)−0.0002 (13)−0.0070 (11)−0.0070 (12)
C70.0310 (14)0.0416 (17)0.0211 (14)−0.0071 (12)−0.0033 (11)0.0017 (12)
C80.0322 (14)0.0367 (15)0.0290 (14)−0.0025 (11)−0.0091 (11)0.0013 (12)
C90.0489 (19)0.0351 (17)0.0497 (19)0.0096 (14)−0.0128 (15)−0.0076 (14)
C100.056 (2)0.045 (2)0.077 (3)0.0101 (17)−0.009 (2)−0.0149 (19)
C110.046 (2)0.058 (2)0.086 (3)0.0160 (18)−0.019 (2)0.005 (2)
C120.0353 (16)0.0540 (19)0.0393 (17)−0.0175 (14)−0.0081 (13)−0.0001 (14)
C130.068 (2)0.0416 (18)0.0459 (19)0.0010 (15)−0.0186 (16)−0.0176 (15)
C140.0393 (18)0.073 (2)0.0341 (17)0.0036 (16)0.0012 (14)−0.0136 (17)
C150.0439 (18)0.0474 (19)0.0400 (17)−0.0165 (15)−0.0109 (14)0.0095 (14)
Ru1—C12.018 (3)C6—C71.421 (4)
Ru1—C1i2.048 (3)C6—C141.484 (4)
Ru1—C21.862 (3)C7—C151.483 (4)
Ru1—C32.246 (3)C8—C91.374 (4)
Ru1—C42.291 (3)C9—C101.449 (5)
Ru1—C52.302 (3)C9—H90.9300
Ru1—C62.282 (3)C10—C111.300 (6)
Ru1—C72.217 (3)C10—H100.9300
Ru1—Ru1i2.7511 (8)C11—H110.9300
S1—C111.718 (4)C12—H12A0.9600
S1—C81.718 (3)C12—H12B0.9600
O1—C21.139 (4)C12—H12C0.9600
O2—C11.173 (3)C13—H13A0.9600
C1—Ru1i2.048 (3)C13—H13B0.9600
C3—C41.420 (4)C13—H13C0.9600
C3—C71.454 (4)C14—H14A0.9600
C3—C81.476 (4)C14—H14B0.9600
C4—C51.436 (4)C14—H14C0.9600
C4—C121.499 (4)C15—H15A0.9600
C5—C61.428 (4)C15—H15B0.9600
C5—C131.502 (4)C15—H15C0.9600
C2—Ru1—C192.57 (13)C6—C5—C13124.5 (3)
C2—Ru1—C1i93.27 (14)C4—C5—C13126.8 (3)
C1—Ru1—C1i94.85 (10)C6—C5—Ru171.09 (15)
C2—Ru1—C793.67 (13)C4—C5—Ru171.36 (15)
C1—Ru1—C7135.88 (11)C13—C5—Ru1128.18 (19)
C1i—Ru1—C7128.26 (11)C7—C6—C5107.8 (2)
C2—Ru1—C3110.26 (13)C7—C6—C14126.8 (3)
C1—Ru1—C399.57 (11)C5—C6—C14125.4 (3)
C1i—Ru1—C3151.61 (11)C7—C6—Ru169.11 (15)
C7—Ru1—C338.01 (10)C5—C6—Ru172.61 (15)
C2—Ru1—C6113.52 (13)C14—C6—Ru1125.5 (2)
C1—Ru1—C6151.57 (11)C6—C7—C3108.2 (3)
C1i—Ru1—C694.73 (11)C6—C7—C15125.8 (3)
C7—Ru1—C636.80 (10)C3—C7—C15125.7 (3)
C3—Ru1—C661.88 (10)C6—C7—Ru174.10 (16)
C2—Ru1—C4146.49 (13)C3—C7—Ru172.09 (15)
C1—Ru1—C491.03 (11)C15—C7—Ru1125.5 (2)
C1i—Ru1—C4119.61 (11)C9—C8—C3129.5 (3)
C7—Ru1—C461.83 (10)C9—C8—S1111.3 (2)
C3—Ru1—C436.45 (10)C3—C8—S1119.1 (2)
C6—Ru1—C461.06 (10)C8—C9—C10110.1 (3)
C2—Ru1—C5149.83 (12)C8—C9—H9125.0
C1—Ru1—C5116.93 (11)C10—C9—H9125.0
C1i—Ru1—C590.57 (11)C11—C10—C9114.9 (4)
C7—Ru1—C561.24 (11)C11—C10—H10122.6
C3—Ru1—C561.10 (10)C9—C10—H10122.6
C6—Ru1—C536.30 (11)C10—C11—S1111.7 (3)
C4—Ru1—C536.45 (10)C10—C11—H11124.1
C2—Ru1—Ru1i94.32 (10)S1—C11—H11124.1
C1—Ru1—Ru1i47.87 (8)C4—C12—H12A109.5
C1i—Ru1—Ru1i46.97 (8)C4—C12—H12B109.5
C7—Ru1—Ru1i170.96 (8)H12A—C12—H12B109.5
C3—Ru1—Ru1i140.96 (7)C4—C12—H12C109.5
C6—Ru1—Ru1i134.95 (8)H12A—C12—H12C109.5
C4—Ru1—Ru1i112.39 (7)H12B—C12—H12C109.5
C5—Ru1—Ru1i109.85 (8)C5—C13—H13A109.5
C11—S1—C891.94 (18)C5—C13—H13B109.5
O2—C1—Ru1139.3 (2)H13A—C13—H13B109.5
O2—C1—Ru1i135.5 (2)C5—C13—H13C109.5
Ru1—C1—Ru1i85.15 (10)H13A—C13—H13C109.5
O1—C2—Ru1175.9 (3)H13B—C13—H13C109.5
C4—C3—C7107.5 (2)C6—C14—H14A109.5
C4—C3—C8126.3 (2)C6—C14—H14B109.5
C7—C3—C8126.0 (3)H14A—C14—H14B109.5
C4—C3—Ru173.49 (15)C6—C14—H14C109.5
C7—C3—Ru169.90 (15)H14A—C14—H14C109.5
C8—C3—Ru1126.41 (19)H14B—C14—H14C109.5
C3—C4—C5108.1 (2)C7—C15—H15A109.5
C3—C4—C12125.5 (3)C7—C15—H15B109.5
C5—C4—C12126.3 (3)H15A—C15—H15B109.5
C3—C4—Ru170.06 (15)C7—C15—H15C109.5
C5—C4—Ru172.19 (16)H15A—C15—H15C109.5
C12—C4—Ru1125.7 (2)H15B—C15—H15C109.5
C6—C5—C4108.4 (3)
C2—Ru1—C1—O2−85.4 (4)Ru1i—Ru1—C5—C4−101.12 (15)
C1i—Ru1—C1—O2−178.9 (5)C2—Ru1—C5—C13−119.8 (4)
C7—Ru1—C1—O212.6 (5)C1—Ru1—C5—C1373.4 (3)
C3—Ru1—C1—O225.7 (4)C1i—Ru1—C5—C13−22.3 (3)
C6—Ru1—C1—O271.9 (5)C7—Ru1—C5—C13−156.8 (3)
C4—Ru1—C1—O261.3 (4)C3—Ru1—C5—C13159.6 (3)
C5—Ru1—C1—O288.0 (4)C6—Ru1—C5—C13−119.5 (4)
Ru1i—Ru1—C1—O2−178.9 (5)C4—Ru1—C5—C13122.6 (4)
C2—Ru1—C1—Ru1i93.50 (13)Ru1i—Ru1—C5—C1321.5 (3)
C1i—Ru1—C1—Ru1i0.0C4—C5—C6—C7−1.5 (3)
C7—Ru1—C1—Ru1i−168.55 (12)C13—C5—C6—C7−175.7 (3)
C3—Ru1—C1—Ru1i−155.46 (10)Ru1—C5—C6—C760.44 (19)
C6—Ru1—C1—Ru1i−109.3 (2)C4—C5—C6—C14176.4 (3)
C4—Ru1—C1—Ru1i−119.83 (10)C13—C5—C6—C142.2 (5)
C5—Ru1—C1—Ru1i−93.11 (11)Ru1—C5—C6—C14−121.6 (3)
C2—Ru1—C3—C4174.96 (17)C4—C5—C6—Ru1−61.97 (18)
C1—Ru1—C3—C478.61 (17)C13—C5—C6—Ru1123.9 (3)
C1i—Ru1—C3—C4−40.9 (3)C2—Ru1—C6—C762.3 (2)
C7—Ru1—C3—C4−116.2 (2)C1—Ru1—C6—C7−92.8 (3)
C6—Ru1—C3—C4−78.47 (17)C1i—Ru1—C6—C7157.92 (18)
C5—Ru1—C3—C4−36.95 (16)C3—Ru1—C6—C7−39.01 (17)
Ru1i—Ru1—C3—C449.3 (2)C4—Ru1—C6—C7−80.71 (18)
C2—Ru1—C3—C7−68.8 (2)C5—Ru1—C6—C7−117.6 (2)
C1—Ru1—C3—C7−165.16 (18)Ru1i—Ru1—C6—C7−174.32 (13)
C1i—Ru1—C3—C775.4 (3)C2—Ru1—C6—C5179.85 (18)
C6—Ru1—C3—C737.75 (17)C1—Ru1—C6—C524.8 (3)
C4—Ru1—C3—C7116.2 (2)C1i—Ru1—C6—C5−84.50 (18)
C5—Ru1—C3—C779.27 (18)C7—Ru1—C6—C5117.6 (2)
Ru1i—Ru1—C3—C7165.55 (13)C3—Ru1—C6—C578.57 (18)
C2—Ru1—C3—C851.7 (3)C4—Ru1—C6—C536.87 (16)
C1—Ru1—C3—C8−44.6 (3)Ru1i—Ru1—C6—C5−56.74 (19)
C1i—Ru1—C3—C8−164.1 (2)C2—Ru1—C6—C14−58.7 (3)
C7—Ru1—C3—C8120.5 (3)C1—Ru1—C6—C14146.3 (3)
C6—Ru1—C3—C8158.3 (3)C1i—Ru1—C6—C1436.9 (3)
C4—Ru1—C3—C8−123.2 (3)C7—Ru1—C6—C14−121.0 (4)
C5—Ru1—C3—C8−160.2 (3)C3—Ru1—C6—C14−160.0 (3)
Ru1i—Ru1—C3—C8−73.9 (3)C4—Ru1—C6—C14158.3 (3)
C7—C3—C4—C50.5 (3)C5—Ru1—C6—C14121.4 (4)
C8—C3—C4—C5−174.1 (3)Ru1i—Ru1—C6—C1464.7 (3)
Ru1—C3—C4—C562.55 (18)C5—C6—C7—C31.8 (3)
C7—C3—C4—C12177.7 (3)C14—C6—C7—C3−176.0 (3)
C8—C3—C4—C123.1 (4)Ru1—C6—C7—C364.53 (19)
Ru1—C3—C4—C12−120.3 (3)C5—C6—C7—C15174.8 (3)
C7—C3—C4—Ru1−62.02 (18)C14—C6—C7—C15−3.1 (5)
C8—C3—C4—Ru1123.4 (3)Ru1—C6—C7—C15−122.6 (3)
C2—Ru1—C4—C3−8.6 (3)C5—C6—C7—Ru1−62.68 (19)
C1—Ru1—C4—C3−104.80 (17)C14—C6—C7—Ru1119.4 (3)
C1i—Ru1—C4—C3159.04 (16)C4—C3—C7—C6−1.5 (3)
C7—Ru1—C4—C338.80 (16)C8—C3—C7—C6173.1 (3)
C6—Ru1—C4—C380.91 (17)Ru1—C3—C7—C6−65.85 (19)
C5—Ru1—C4—C3117.6 (2)C4—C3—C7—C15−174.4 (3)
Ru1i—Ru1—C4—C3−148.89 (13)C8—C3—C7—C150.2 (5)
C2—Ru1—C4—C5−126.2 (2)Ru1—C3—C7—C15121.2 (3)
C1—Ru1—C4—C5137.56 (18)C4—C3—C7—Ru164.38 (18)
C1i—Ru1—C4—C541.4 (2)C8—C3—C7—Ru1−121.0 (3)
C7—Ru1—C4—C5−78.84 (18)C2—Ru1—C7—C6−125.6 (2)
C3—Ru1—C4—C5−117.6 (2)C1—Ru1—C7—C6136.91 (19)
C6—Ru1—C4—C5−36.73 (17)C1i—Ru1—C7—C6−28.5 (2)
Ru1i—Ru1—C4—C593.47 (16)C3—Ru1—C7—C6115.6 (2)
C2—Ru1—C4—C12111.4 (3)C4—Ru1—C7—C678.44 (18)
C1—Ru1—C4—C1215.2 (3)C5—Ru1—C7—C636.77 (16)
C1i—Ru1—C4—C12−81.0 (3)C2—Ru1—C7—C3118.77 (19)
C7—Ru1—C4—C12158.8 (3)C1—Ru1—C7—C321.3 (3)
C3—Ru1—C4—C12120.0 (3)C1i—Ru1—C7—C3−144.14 (17)
C6—Ru1—C4—C12−159.1 (3)C6—Ru1—C7—C3−115.6 (2)
C5—Ru1—C4—C12−122.4 (3)C4—Ru1—C7—C3−37.20 (16)
Ru1i—Ru1—C4—C12−28.9 (3)C5—Ru1—C7—C3−78.87 (18)
C3—C4—C5—C60.6 (3)C2—Ru1—C7—C15−2.7 (3)
C12—C4—C5—C6−176.5 (3)C1—Ru1—C7—C15−100.2 (3)
Ru1—C4—C5—C661.80 (18)C1i—Ru1—C7—C1594.4 (3)
C3—C4—C5—C13174.6 (3)C3—Ru1—C7—C15−121.5 (3)
C12—C4—C5—C13−2.5 (4)C6—Ru1—C7—C15122.9 (3)
Ru1—C4—C5—C13−124.2 (3)C4—Ru1—C7—C15−158.7 (3)
C3—C4—C5—Ru1−61.19 (18)C5—Ru1—C7—C15159.7 (3)
C12—C4—C5—Ru1121.7 (3)C4—C3—C8—C9−114.8 (4)
C2—Ru1—C5—C6−0.3 (3)C7—C3—C8—C971.6 (5)
C1—Ru1—C5—C6−167.05 (16)Ru1—C3—C8—C9−18.8 (5)
C1i—Ru1—C5—C697.23 (18)C4—C3—C8—S169.0 (3)
C7—Ru1—C5—C6−37.27 (17)C7—C3—C8—S1−104.6 (3)
C3—Ru1—C5—C6−80.92 (18)Ru1—C3—C8—S1164.94 (16)
C4—Ru1—C5—C6−117.9 (2)C11—S1—C8—C91.7 (3)
Ru1i—Ru1—C5—C6141.01 (15)C11—S1—C8—C3178.6 (3)
C2—Ru1—C5—C4117.6 (3)C3—C8—C9—C10−178.1 (3)
C1—Ru1—C5—C4−49.17 (19)S1—C8—C9—C10−1.6 (4)
C1i—Ru1—C5—C4−144.90 (17)C8—C9—C10—C110.6 (5)
C7—Ru1—C5—C480.60 (18)C9—C10—C11—S10.7 (5)
C3—Ru1—C5—C436.96 (16)C8—S1—C11—C10−1.4 (4)
C6—Ru1—C5—C4117.9 (2)
D—H···AD—HH···AD···AD—H···A
C10—H10···O2ii0.932.603.335 (5)136
C14—H14B···O2i0.962.583.319 (4)134
Table 1

Selected bond lengths (Å)

Ru1—C12.018 (3)
Ru1—C1i2.048 (3)
Ru1—C21.862 (3)
Ru1—C32.246 (3)
Ru1—C42.291 (3)
Ru1—C52.302 (3)
Ru1—C62.282 (3)
Ru1—C72.217 (3)

Symmetry code: (i) .

Table 2

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C10—H10⋯O2ii0.932.603.335 (5)136
C14—H14B⋯O2i0.962.583.319 (4)134

Symmetry codes: (i) ; (ii) .

  2 in total

1.  Mono(cyclopentadienyl) complexes of the rare-earth metals.

Authors:  Stefan Arndt; Jun Okuda
Journal:  Chem Rev       Date:  2002-06       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

  2 in total

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