Literature DB >> 21588811

(+)-{1,2-Bis[(2R,5R)-2,5-diethyl-phospho-lan-1-yl]ethane-κP,P'}(η-cyclo-octa-1,5-diene)rhodium(I) tetra-fluoridoborate.

Stefan Schulz1, Christian Fischer, Hans-Joachim Drexler, Detlef Heller.   

Abstract

The title compound, [Rh(C(8)H(12))(C(18)H(36)P(2))]BF(4), exhibits a rhodium(I) complex cation with a bidentate bis-phosphine ligand and a bidentate η(2),η(2)-coordinated cyclo-octa-1,5-diene ligand. The ligands form a slightly distorted square-planar coordination environment for the Rh(I) atom. An intra-molecular P-Rh-P bite angle of 83.91 (2)° is observed. The dihedral angle between the P-Rh-P and the X-Rh-X planes (X is the centroid of a double bond) is 14.0 (1)°. The BF(4) anion is disordered over two positions in a 0.515 (7):0.485 (7) ratio.

Entities:  

Year:  2010        PMID: 21588811      PMCID: PMC3008980          DOI: 10.1107/S1600536810039577

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


Related literature

For general synthetic aspects and different related structures of cationic rhodium bis­phosphine diolefin complexes, see: Schulz et al. (2010 ▶) and references cited therein. For applications of the Et-BPE ligand {Et-BPE (1,2-bis[(2R,5R)-2,5-diethylphospholan-1-yl]ethane)} in catalytic reactions, see: Axtell et al. (2005 ▶); Jerphagnon et al. (2003 ▶); Burk et al. (1998 ▶). For related structures, see: Burk et al. (1990 ▶); Drexler et al. (2001 ▶, 2004 ▶).

Experimental

Crystal data

[Rh(C8H12)(C18H36P2)]BF4 M = 612.32 Orthorhombic, a = 8.8374 (18) Å b = 16.218 (3) Å c = 19.946 (4) Å V = 2858.7 (10) Å3 Z = 4 Mo Kα radiation μ = 0.75 mm−1 T = 200 K 0.50 × 0.43 × 0.40 mm

Data collection

STOE IPDS 2 diffractometer Absorption correction: numerical (X-SHAPE; Stoe & Cie, 2005) T min = 0.728, T max = 0.858 36650 measured reflections 6075 independent reflections 5779 reflections with I > 2σ(I) R int = 0.035

Refinement

R[F 2 > 2σ(F 2)] = 0.027 wR(F 2) = 0.073 S = 1.06 6075 reflections 305 parameters 21 restraints H-atom parameters constrained Δρmax = 0.95 e Å−3 Δρmin = −0.34 e Å−3 Absolute structure: Flack (1983 ▶), 2621 Friedel pairs Flack parameter: −0.02 (2) Data collection: X-AREA (Stoe & Cie, 2005) ▶; cell refinement: X-AREA ▶; data reduction: X-RED32 (Stoe & Cie, 2005) ▶; 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/S1600536810039577/si2281sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536810039577/si2281Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
[Rh(C8H12)(C18H36P2)]BF4F(000) = 1280
Mr = 612.32Dx = 1.423 Mg m3
Orthorhombic, P212121Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2ac 2abCell parameters from 54003 reflections
a = 8.8374 (18) Åθ = 1.6–27.2°
b = 16.218 (3) ŵ = 0.75 mm1
c = 19.946 (4) ÅT = 200 K
V = 2858.7 (10) Å3Part of block, red
Z = 40.50 × 0.43 × 0.40 mm
STOE IPDS 2 diffractometer6075 independent reflections
Radiation source: fine-focus sealed tube5779 reflections with I > 2σ(I)
graphiteRint = 0.035
Detector resolution: 6.67 pixels mm-1θmax = 26.8°, θmin = 1.6°
rotation method scansh = −11→11
Absorption correction: numerical (X-SHAPE; Stoe & Cie, 2005)k = −20→20
Tmin = 0.728, Tmax = 0.858l = −25→25
36650 measured reflections
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) = 0.073w = 1/[σ2(Fo2) + (0.0545P)2 + 0.2291P] where P = (Fo2 + 2Fc2)/3
S = 1.06(Δ/σ)max = 0.002
6075 reflectionsΔρmax = 0.95 e Å3
305 parametersΔρmin = −0.34 e Å3
21 restraintsAbsolute structure: Flack (1983), 2621 Friedel pairs
Primary atom site location: structure-invariant direct methodsFlack parameter: −0.02 (2)
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*/UeqOcc. (<1)
Rh10.55265 (2)0.179334 (12)0.820495 (9)0.02703 (6)
P10.62151 (8)0.15079 (4)0.71305 (3)0.02599 (13)
P20.62220 (8)0.04667 (4)0.83972 (3)0.02676 (13)
C10.5242 (4)0.31550 (18)0.80272 (15)0.0417 (7)
H1A0.56630.33480.76000.050*
C20.3872 (4)0.2772 (2)0.79692 (15)0.0431 (7)
H2A0.35020.27490.75060.052*
C30.2629 (5)0.2709 (3)0.8481 (2)0.0656 (11)
H3A0.19690.22540.83620.079*
H3B0.20320.32110.84700.079*
C40.3214 (6)0.2576 (3)0.9195 (2)0.0721 (13)
H4A0.34890.31060.93840.087*
H4B0.24010.23510.94660.087*
C50.4564 (6)0.2006 (2)0.92417 (14)0.0550 (10)
H5A0.43800.15000.94990.066*
C60.6040 (6)0.2249 (2)0.92248 (16)0.0555 (11)
H6A0.67200.18880.94790.067*
C70.6635 (7)0.3112 (2)0.91348 (19)0.0689 (13)
H7A0.76850.30790.89950.083*
H7B0.66120.33890.95660.083*
C80.5783 (6)0.3636 (2)0.86315 (19)0.0667 (13)
H8A0.49160.38830.88520.080*
H8B0.64370.40800.84810.080*
C90.6456 (3)0.03874 (18)0.70368 (13)0.0333 (6)
H9A0.54780.01220.69880.040*
H9B0.70570.02670.66420.040*
C100.7254 (3)0.00717 (18)0.76640 (13)0.0340 (6)
H10A0.82940.02640.76720.041*
H10B0.7259−0.05260.76680.041*
C110.5147 (3)0.18501 (18)0.63828 (12)0.0309 (5)
H11A0.48300.24210.64620.037*
C120.6369 (4)0.1865 (2)0.58392 (14)0.0435 (7)
H12A0.66050.13080.56960.052*
H12B0.60180.21740.54530.052*
C130.7764 (4)0.2272 (2)0.61365 (17)0.0484 (8)
H13A0.76100.28630.61610.058*
H13B0.86310.21680.58500.058*
C140.8070 (3)0.19301 (18)0.68390 (14)0.0364 (6)
H14A0.87730.14660.67930.044*
C150.3730 (4)0.1352 (2)0.62165 (15)0.0414 (7)
H15A0.30830.13280.66090.050*
H15B0.40200.07930.61020.050*
C160.2847 (4)0.1727 (3)0.56339 (17)0.0522 (8)
H16A0.19600.14020.55490.078*
H16B0.34730.17350.52410.078*
H16C0.25530.22800.57460.078*
C170.8803 (4)0.2564 (3)0.7303 (2)0.0556 (9)
H17A0.81190.30260.73620.067*
H17B0.89710.23160.77390.067*
C181.0305 (5)0.2877 (3)0.7027 (3)0.0729 (12)
H18A1.07300.32720.73330.109*
H18B1.01400.31350.66000.109*
H18C1.09910.24230.69750.109*
C190.7298 (3)0.01375 (18)0.91399 (14)0.0338 (6)
H19A0.69110.04510.95230.041*
C200.6821 (4)−0.07572 (19)0.92375 (17)0.0449 (7)
H20A0.7293−0.11080.89030.054*
H20B0.7111−0.09510.96790.054*
C210.5106 (4)−0.07681 (19)0.91604 (16)0.0428 (7)
H21A0.4637−0.04990.95420.051*
H21B0.4747−0.13330.91430.051*
C220.4677 (3)−0.03148 (17)0.85109 (14)0.0345 (6)
H22A0.4750−0.07110.81410.041*
C230.3065 (4)0.0006 (2)0.85289 (17)0.0448 (7)
H23A0.30000.04360.88650.054*
H23B0.2402−0.04390.86680.054*
C240.2487 (4)0.0349 (3)0.7865 (2)0.0622 (10)
H24A0.14660.05400.79200.093*
H24B0.2513−0.00760.75300.093*
H24C0.31180.08000.77270.093*
C250.9010 (4)0.0292 (2)0.91028 (17)0.0456 (7)
H25A0.9430−0.00310.87380.055*
H25B0.91860.08690.90030.055*
C260.9818 (5)0.0075 (4)0.9735 (2)0.0775 (13)
H26A1.08790.01840.96830.116*
H26B0.9669−0.04990.98320.116*
H26C0.94250.04011.00970.116*
B10.5008 (3)0.0287 (2)0.09541 (15)0.0521 (9)
F10.4824 (5)0.0657 (3)0.15617 (16)0.1419 (18)
F20.4003 (6)0.0460 (4)0.0449 (2)0.0663 (15)*0.515 (7)
F30.6464 (5)0.0467 (4)0.0748 (3)0.0791 (18)*0.515 (7)
F40.4794 (10)−0.0470 (4)0.1253 (4)0.125 (3)*0.515 (7)
F2'0.3620 (5)0.0229 (4)0.0636 (3)0.0655 (15)*0.485 (7)
F3'0.5818 (10)0.0895 (5)0.0629 (4)0.111 (3)*0.485 (7)
F4'0.5614 (7)−0.0489 (3)0.0851 (3)0.0781 (19)*0.485 (7)
U11U22U33U12U13U23
Rh10.03754 (10)0.02407 (10)0.01948 (9)0.00346 (8)−0.00143 (7)−0.00007 (7)
P10.0289 (3)0.0278 (3)0.0213 (3)0.0005 (2)0.0010 (2)0.0001 (2)
P20.0317 (3)0.0240 (3)0.0246 (3)0.0016 (3)−0.0005 (2)0.0006 (2)
C10.0641 (19)0.0273 (13)0.0336 (13)0.0106 (14)−0.0043 (12)0.0059 (11)
C20.0526 (17)0.0443 (17)0.0324 (13)0.0261 (15)0.0063 (13)0.0056 (12)
C30.062 (2)0.076 (3)0.059 (2)0.030 (2)0.0252 (19)0.006 (2)
C40.107 (4)0.065 (3)0.044 (2)0.028 (2)0.037 (2)0.0032 (18)
C50.104 (3)0.0408 (18)0.0198 (12)0.0109 (19)0.0115 (17)0.0005 (11)
C60.111 (3)0.0291 (16)0.0265 (14)0.0103 (18)−0.0235 (17)−0.0037 (12)
C70.126 (4)0.0322 (18)0.0481 (19)−0.002 (2)−0.034 (2)−0.0029 (15)
C80.124 (4)0.0303 (17)0.0455 (18)0.002 (2)−0.015 (2)0.0045 (14)
C90.0405 (15)0.0334 (14)0.0260 (12)0.0011 (11)0.0036 (10)−0.0019 (11)
C100.0411 (15)0.0310 (14)0.0299 (13)0.0040 (11)0.0038 (11)−0.0001 (11)
C110.0391 (14)0.0326 (13)0.0210 (10)0.0000 (11)−0.0007 (9)0.0014 (10)
C120.0479 (17)0.057 (2)0.0253 (12)0.0031 (16)0.0055 (11)0.0059 (13)
C130.0458 (17)0.061 (2)0.0386 (16)−0.0046 (15)0.0080 (13)0.0160 (15)
C140.0327 (13)0.0392 (15)0.0371 (14)0.0000 (10)0.0009 (11)0.0051 (12)
C150.0480 (17)0.0448 (17)0.0314 (14)−0.0022 (14)−0.0072 (12)0.0045 (12)
C160.0573 (19)0.057 (2)0.0426 (16)−0.0054 (18)−0.0188 (14)0.0081 (17)
C170.0420 (17)0.063 (2)0.062 (2)−0.0173 (17)0.0009 (16)−0.0054 (18)
C180.047 (2)0.085 (3)0.087 (3)−0.024 (2)−0.0018 (19)0.002 (2)
C190.0390 (15)0.0329 (15)0.0294 (13)0.0031 (11)−0.0023 (11)0.0043 (11)
C200.060 (2)0.0308 (15)0.0440 (17)0.0067 (14)−0.0009 (15)0.0087 (13)
C210.0573 (19)0.0299 (14)0.0412 (15)−0.0087 (13)0.0024 (13)0.0082 (12)
C220.0418 (16)0.0282 (13)0.0335 (12)−0.0061 (12)0.0032 (11)−0.0025 (10)
C230.0369 (16)0.0483 (18)0.0491 (18)−0.0052 (13)0.0065 (13)0.0055 (15)
C240.0378 (18)0.083 (3)0.066 (2)−0.0052 (18)−0.0062 (16)0.014 (2)
C250.0435 (17)0.0484 (19)0.0450 (17)0.0009 (13)−0.0045 (13)0.0088 (14)
C260.066 (3)0.106 (4)0.061 (3)−0.001 (2)−0.012 (2)0.010 (2)
B10.061 (2)0.045 (2)0.050 (2)−0.0017 (17)−0.0056 (17)0.0075 (17)
F10.118 (3)0.241 (5)0.0664 (18)−0.026 (3)0.0212 (19)−0.049 (3)
Rh1—C22.209 (3)C13—H13B0.9700
Rh1—C62.211 (3)C14—C171.528 (5)
Rh1—C12.251 (3)C14—H14A0.9800
Rh1—C52.262 (3)C15—C161.526 (4)
Rh1—P22.2702 (8)C15—H15A0.9700
Rh1—P12.2754 (8)C15—H15B0.9700
P1—C91.839 (3)C16—H16A0.9600
P1—C111.850 (3)C16—H16B0.9600
P1—C141.869 (3)C16—H16C0.9600
P2—C101.839 (3)C17—C181.524 (5)
P2—C191.840 (3)C17—H17A0.9700
P2—C221.877 (3)C17—H17B0.9700
C1—C21.366 (5)C18—H18A0.9600
C1—C81.514 (5)C18—H18B0.9600
C1—H1A0.9800C18—H18C0.9600
C2—C31.503 (5)C19—C201.523 (4)
C2—H2A0.9800C19—C251.536 (5)
C3—C41.531 (6)C19—H19A0.9800
C3—H3A0.9700C20—C211.524 (5)
C3—H3B0.9700C20—H20A0.9700
C4—C51.511 (6)C20—H20B0.9700
C4—H4A0.9700C21—C221.537 (4)
C4—H4B0.9700C21—H21A0.9700
C5—C61.363 (7)C21—H21B0.9700
C5—H5A0.9800C22—C231.517 (4)
C6—C71.506 (5)C22—H22A0.9800
C6—H6A0.9800C23—C241.524 (5)
C7—C81.516 (5)C23—H23A0.9700
C7—H7A0.9700C23—H23B0.9700
C7—H7B0.9700C24—H24A0.9600
C8—H8A0.9700C24—H24B0.9600
C8—H8B0.9700C24—H24C0.9600
C9—C101.525 (4)C25—C261.491 (5)
C9—H9A0.9700C25—H25A0.9700
C9—H9B0.9700C25—H25B0.9700
C10—H10A0.9700C26—H26A0.9600
C10—H10B0.9700C26—H26B0.9600
C11—C151.526 (4)C26—H26C0.9600
C11—C121.531 (4)B1—F11.362 (3)
C11—H11A0.9800B1—F21.372 (4)
C12—C131.518 (5)B1—F41.377 (4)
C12—H12A0.9700B1—F3'1.381 (4)
C12—H12B0.9700B1—F31.382 (4)
C13—C141.531 (4)B1—F4'1.383 (4)
C13—H13A0.9700B1—F2'1.384 (4)
C2—Rh1—C695.24 (13)C14—C13—H13A109.6
C2—Rh1—C135.65 (13)C12—C13—H13B109.6
C6—Rh1—C180.79 (11)C14—C13—H13B109.6
C2—Rh1—C580.57 (12)H13A—C13—H13B108.2
C6—Rh1—C535.46 (17)C17—C14—C13112.7 (3)
C1—Rh1—C587.29 (11)C17—C14—P1115.5 (2)
C2—Rh1—P2153.68 (10)C13—C14—P1105.2 (2)
C6—Rh1—P296.08 (9)C17—C14—H14A107.7
C1—Rh1—P2170.65 (9)C13—C14—H14A107.7
C5—Rh1—P295.26 (9)P1—C14—H14A107.7
C2—Rh1—P197.05 (8)C11—C15—C16112.0 (3)
C6—Rh1—P1151.59 (13)C11—C15—H15A109.2
C1—Rh1—P194.65 (8)C16—C15—H15A109.2
C5—Rh1—P1172.93 (13)C11—C15—H15B109.2
P2—Rh1—P183.91 (2)C16—C15—H15B109.2
C9—P1—C11105.88 (13)H15A—C15—H15B107.9
C9—P1—C14103.23 (13)C15—C16—H16A109.5
C11—P1—C1494.99 (12)C15—C16—H16B109.5
C9—P1—Rh1109.13 (9)H16A—C16—H16B109.5
C11—P1—Rh1124.17 (9)C15—C16—H16C109.5
C14—P1—Rh1116.93 (10)H16A—C16—H16C109.5
C10—P2—C19106.43 (13)H16B—C16—H16C109.5
C10—P2—C22102.82 (13)C18—C17—C14112.0 (3)
C19—P2—C2294.75 (13)C18—C17—H17A109.2
C10—P2—Rh1109.28 (9)C14—C17—H17A109.2
C19—P2—Rh1123.44 (10)C18—C17—H17B109.2
C22—P2—Rh1117.61 (10)C14—C17—H17B109.2
C2—C1—C8125.6 (3)H17A—C17—H17B107.9
C2—C1—Rh170.51 (16)C17—C18—H18A109.5
C8—C1—Rh1110.2 (2)C17—C18—H18B109.5
C2—C1—H1A114.1H18A—C18—H18B109.5
C8—C1—H1A114.1C17—C18—H18C109.5
Rh1—C1—H1A114.1H18A—C18—H18C109.5
C1—C2—C3128.4 (3)H18B—C18—H18C109.5
C1—C2—Rh173.84 (17)C20—C19—C25115.7 (3)
C3—C2—Rh1106.9 (2)C20—C19—P2103.7 (2)
C1—C2—H2A113.2C25—C19—P2115.0 (2)
C3—C2—H2A113.2C20—C19—H19A107.3
Rh1—C2—H2A113.2C25—C19—H19A107.3
C2—C3—C4113.2 (4)P2—C19—H19A107.3
C2—C3—H3A108.9C21—C20—C19105.9 (3)
C4—C3—H3A108.9C21—C20—H20A110.6
C2—C3—H3B108.9C19—C20—H20A110.6
C4—C3—H3B108.9C21—C20—H20B110.6
H3A—C3—H3B107.7C19—C20—H20B110.6
C5—C4—C3114.2 (3)H20A—C20—H20B108.7
C5—C4—H4A108.7C20—C21—C22109.0 (3)
C3—C4—H4A108.7C20—C21—H21A109.9
C5—C4—H4B108.7C22—C21—H21A109.9
C3—C4—H4B108.7C20—C21—H21B109.9
H4A—C4—H4B107.6C22—C21—H21B109.9
C6—C5—C4125.2 (4)H21A—C21—H21B108.3
C6—C5—Rh170.2 (2)C23—C22—C21112.1 (3)
C4—C5—Rh1109.5 (2)C23—C22—P2117.0 (2)
C6—C5—H5A114.4C21—C22—P2104.2 (2)
C4—C5—H5A114.4C23—C22—H22A107.7
Rh1—C5—H5A114.4C21—C22—H22A107.7
C5—C6—C7127.3 (4)P2—C22—H22A107.7
C5—C6—Rh174.32 (19)C22—C23—C24114.8 (3)
C7—C6—Rh1105.8 (2)C22—C23—H23A108.6
C5—C6—H6A113.7C24—C23—H23A108.6
C7—C6—H6A113.7C22—C23—H23B108.6
Rh1—C6—H6A113.7C24—C23—H23B108.6
C6—C7—C8115.2 (4)H23A—C23—H23B107.5
C6—C7—H7A108.5C23—C24—H24A109.5
C8—C7—H7A108.5C23—C24—H24B109.5
C6—C7—H7B108.5H24A—C24—H24B109.5
C8—C7—H7B108.5C23—C24—H24C109.5
H7A—C7—H7B107.5H24A—C24—H24C109.5
C1—C8—C7113.3 (3)H24B—C24—H24C109.5
C1—C8—H8A108.9C26—C25—C19113.1 (3)
C7—C8—H8A108.9C26—C25—H25A109.0
C1—C8—H8B108.9C19—C25—H25A109.0
C7—C8—H8B108.9C26—C25—H25B109.0
H8A—C8—H8B107.7C19—C25—H25B109.0
C10—C9—P1107.57 (19)H25A—C25—H25B107.8
C10—C9—H9A110.2C25—C26—H26A109.5
P1—C9—H9A110.2C25—C26—H26B109.5
C10—C9—H9B110.2H26A—C26—H26B109.5
P1—C9—H9B110.2C25—C26—H26C109.5
H9A—C9—H9B108.5H26A—C26—H26C109.5
C9—C10—P2107.82 (19)H26B—C26—H26C109.5
C9—C10—H10A110.1F1—B1—F2119.1 (4)
P2—C10—H10A110.1F1—B1—F489.5 (5)
C9—C10—H10B110.1F2—B1—F4114.3 (5)
P2—C10—H10B110.1F1—B1—F3'99.5 (4)
H10A—C10—H10B108.5F2—B1—F3'81.1 (5)
C15—C11—C12115.7 (2)F4—B1—F3'155.6 (6)
C15—C11—P1115.8 (2)F1—B1—F3106.4 (4)
C12—C11—P1102.44 (19)F2—B1—F3109.9 (4)
C15—C11—H11A107.5F4—B1—F3116.4 (5)
C12—C11—H11A107.5F1—B1—F4'125.4 (4)
P1—C11—H11A107.5F2—B1—F4'109.1 (4)
C13—C12—C11107.6 (2)F4—B1—F4'46.1 (4)
C13—C12—H12A110.2F3'—B1—F4'112.3 (5)
C11—C12—H12A110.2F3—B1—F4'77.7 (4)
C13—C12—H12B110.2F1—B1—F2'109.4 (4)
C11—C12—H12B110.2F4—B1—F2'90.9 (5)
H12A—C12—H12B108.5F3'—B1—F2'107.0 (5)
C12—C13—C14110.1 (3)F3—B1—F2'134.7 (4)
C12—C13—H13A109.6F4'—B1—F2'102.3 (4)
  3 in total

1.  Highly regio- and enantioselective asymmetric hydroformylation of olefins mediated by 2,5-disubstituted phospholane ligands.

Authors:  Alex T Axtell; Christopher J Cobley; Jerzy Klosin; Gregory T Whiteker; Antonio Zanotti-Gerosa; Khalil A Abboud
Journal:  Angew Chem Int Ed Engl       Date:  2005-09-12       Impact factor: 15.336

2.  A short history of SHELX.

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

3.  (+)-{1,2-Bis[(2R,5R)-2,5-dimethyl-phospho-lan-1-yl]ethane-κP,P'}(η-cyclo-octa-1,5-diene)rhodium(I) tetra-fluorido-borate.

Authors:  Stefan Schulz; Hans-Joachim Drexler; Detlef Heller
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-05-29
  3 in total

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