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53649097607
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X-ray data were collected on a Nonius Kappa CCD diffractometer with rotating anode (graphite monochromator, λ, 0.71073 Å) up to a resolution of (sin θ/λ)max, 0.65 Å-1 at a temperature of 150 K. The structures were solved by direct methods (SHELXS-97)[20] and refined with SHELXL-97[20] against F2 of all reflections. Non-hydrogen atoms were refined with anisotropic displacement parameters. Hydrogen atoms were introduced in calculated positions and refined with a riding model. Geometry calculations and checking for higher symmetry was performed with the PLATON program, 21] 1: [C20H40KO8](C 20H36CoP4, Mw, 906.92, red block, 0.48 x 0.30 x 0.21 mm3, monoclinic, P2 1/c (no. 14, a, 10.2813(9, b, 23.7637(2, c, 19.9146(9) Å, β
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3. CCDC-676286 (1), -676287 (2), -676288 (3), and -676289 (4) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
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53649088035
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2D](D- 2) was prepared for comparison and found to display spectroscopic properties identical to those of H-2; see the Supporting Information for details.
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2D](D- 2) was prepared for comparison and found to display spectroscopic properties identical to those of H-2; see the Supporting Information for details.
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33
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53649089651
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Geometry optimizations and frequency calculations were performed with the Gaussian 03 suite of programs (Gaussian 03, Revision C.02, M. J. Frisch et al., Gaussian, Inc., Wallingford CT, 2004),
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Geometry optimizations and frequency calculations were performed with the Gaussian 03 suite of programs (Gaussian 03, Revision C.02, M. J. Frisch et al., Gaussian, Inc., Wallingford CT, 2004),
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34
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4243943295
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using the exchange-correlation potential PBE (J. P. Perdew, K. Burke, M. Ernzerhof, Phys. Rev. Lett. 1996, 77, 3865),
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using the exchange-correlation potential PBE (J. P. Perdew, K. Burke, M. Ernzerhof, Phys. Rev. Lett. 1996, 77, 3865),
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35
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49049133260
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the SDD basis set for cobalt (P. Fuentealba, H. Preuss, H. Stoll, L. von Szentpaly, Chem. Phys. Lett. 1982, 89, 418), and the 6-311G(d,p) basis set for all other atoms; see the Supporting Information for details.
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the SDD basis set for cobalt (P. Fuentealba, H. Preuss, H. Stoll, L. von Szentpaly, Chem. Phys. Lett. 1982, 89, 418), and the 6-311G(d,p) basis set for all other atoms; see the Supporting Information for details.
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36
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53649085001
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This assumption is supported by the calculated 1H and 31P NMR chemical shifts of 2a: δ(1H, 2.4 (CoH, 0.9 (tBu, 1.4 ppm (tBu, δ31P, 179, 32, and 123 ppm. These values are in good agreement with those observed experimentally at -80 °C. The hydrogen atom interacting with cobalt displays a characteristic high-field shift while the most shielded signal in the 31P NMR spectrum is assigned to the protonated phosphorus atom
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31P NMR spectrum is assigned to the protonated phosphorus atom.
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37
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53349137598
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41
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51149214048
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For related triphosphacyclopentadiene complexes, see: a
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For related triphosphacyclopentadiene complexes, see: a) V. Caliman, P. B. Hitchcock, J. F. Nixon, J. Chem. Soc. Chem. Commun. 1995, 1661;
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0002593631
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45
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53649086253
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Our assignment is supported by the calculated 31P NMR chemical shifts of 4: δ(31P, 61 (P3, 45 (P1, 51 (P4, 54 (P2, 67 ppm P5, see the Supporting Information for details
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31P) = -61 (P3), +45 (P1), +51 (P4), +54 (P2), +67 ppm (P5); see the Supporting Information for details.
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48
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0037393379
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0344214714
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University of Göttingen, Germany
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G. M. Sheldrick, Twinabs-V1.05. University of Göttingen, Germany, 2005.
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Twinabs-V1.05
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Sheldrick, G.M.1
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