Collect. Czech. Chem. Commun. 2005, 70, 430-440
https://doi.org/10.1135/cccc20050430

Macropolyhedral Boron-Containing Cluster Chemistry. A Metallathiaborane from S2B17H17: Isolation and Characterisation of [(PMe2Ph)2PtS2B16H16]; A neo-arachno Ten-Vertex Cluster Shape, and the Constitution of the [arachno-B10H15]- Anion

Michael J. Carra,b, Michael G. S. Londesborougha, Jonathan Bouldb, Ivana Císařovác, Bohumil Štíbra and John D. Kennedyb,*

a Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež near Prague, Czech Republic
b The School of Chemistry of the University of Leeds, Leeds, UK LS2 9JT, England
c Faculty of Science, Charles University, Hlavova 2030, 128 42 Prague 2, Czech Republic

References

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4. Jelínek T., Štíbr B., Kennedy J. D., Thornton-Pett M. in: Advances in Boron Chemistry (W. Siebert, Ed.), p. 426. Royal Society of Chemistry, Cambridge 1997.
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12. Kaur P., Brownless A., Perera S. D., Cooke P. A., Jelínek T., Kennedy J. D., Thornton-Pett M., Štíbr B.: J. Organomet. Chem. 1998, 557, 181. <https://doi.org/10.1016/S0022-328X(97)00666-9>
13. X-ray diffraction analysis: Crystallographic data for the previously unreported species [(PMe2Ph)2PtS2B16H16] (2) are as follows: C16H38B16P2PtS2: M = 724.57, triclinic (yellow prisms from CH2Cl2/hexane), space group P1, a = 10.3890(1) Å, b = 10.6560(1) Å, c = 14.3730(2) Å, α = 108.7010(7)°, β = 100.9300(7)°, γ = 94.8330(8)°, U = 1461.71(3) Å3, Dcalc = 1.646 Mg m–3, Z = 2, λ = 0.71073 Å (MoKα), μ = 5.062 mm–1, T = 150(2) K, R1 = 0.018 for 6478 reflections with I >> 2σ(I), and wR2 = 0.0439 for all 6729 unique reflections; CCDC 254726. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44-1223/336-033; e-mail: [email protected]).
14. NMR spectroscopy: NMR data for [(PMe2Ph)2PtS2B16H16] (2), CD2Cl2, 298 K, δ in ppm, δ(11B) rel. Ξ 32.083972 MHz (nominally BF3(OEt2) in CDCl3), δ(31P) rel. Ξ 40.480730 MHz (nominally 85% aqueous H3PO4) and δ(1H) rel. Ξ 100 MHz (nominally internal SiMe4). 11B spectrum: sixteen resonance positions have been identified with chemical shifts δ(11B) as follows (with δ(1H) of directly attached exo hydrogen atom in square brackets): +11.2 [+3.85], +10.0 [+4.57], +6.3 [no H(exo)], +5.6 [+2.97], –0.5 [+2.79], –3.6 [no H(exo)], –4.9 [+3.20], –7.5 [+2.76], –11.1 [+3.68], –11.6 [+2.16], –15.4 [+2.34], –22.0 [+0.07], –27.9 [+0.91], 2 × –29.2 [2 × +1.08] (resonances in both 11B and 1H spectra accidentally coincident), and –36.4 [+0.87] ppm. The 1H spectrum also shows δ(1H)(PMe2): +2.00 (3 H, d, 2J(31P-1H) = 11 Hz), +1.90 (3 H, d, 2J(31P-1H) = 11 Hz), +1.79 (3 H, d, 2J(31P-1H) = 10 Hz), +1.67 (3 H, d, 2J(31P-1H) = 10 Hz), with all exhibiting partially resolved 195Pt satellite lines, 3J(195Pt-1H) ≈ 25–30 Hz; additionally δ(1H)(PPh) +7.15 to +7.55 (10 H, complex multiplets). 31P spectrum shows: δ(31P) –9.1 (P(12), broader, 1J(195Pt-31P) ≈ 3100 Hz) and –9.6 (P(11), sharper, 1J(195Pt-31P) = 3818 Hz, 2J(31P-31P) = 29 Hz): a similarly marked differential in magnitudes of coupling constants is general for Pt–P linkages trans to S (larger value) versus Pt–P linkages trans to cage boron atoms (smaller value) in platinathiaboranes12,37,38.
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33. Calculational work: For the density-functional theory (DFT) calculations, the structure of the [B10H15]– monoanion 5 was initially optimised with the STO-3G* basis set, without symmetry constraints, using standard ab initio methods, and starting from an approximate geometry as represented in schematic XII. The final optimisations, including a frequency analysis to confirm a true minimum, followed by GIAO NMR nuclear shielding predictions, were performed using B3LYP methodology as incorporated in the Gaussian 98 package39, and using the 6-31G* basis set. The minimum is represented in Fig. 2 as a molecular structure, and is represented schematically in structure XIII.
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38. Murphy M. P., Spalding T. R., Cowey C., Kennedy J. D., Thornton-Pett M., Holub J.: J. Organomet. Chem. 1998, 550, 151. <https://doi.org/10.1016/S0022-328X(97)00537-8>
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