By R.R. Gupta, M.D. Lechner, H.C. Marsmann (auth.), R.R. Gupta, M.D. Lechner (eds.)

Nuclear Magnetic Resonance (NMR) relies at the undeniable fact that definite nuclei express a magnetic second, orientated through a magnetic box, and take up attribute frequencies within the radiofrequency a part of the spectrum. The spectral traces of the nuclei are hugely prompted by way of the chemical surroundings, i.e. the constitution and interplay of the molecules. NMR is now the prime method and a strong device for the research of the constitution and interplay of molecules. the current Landolt-Börnstein quantity III/35 "Nuclear Magnetic Resonance (NMR) facts" is as a result of significant curiosity to all scientists and engineers who intend to exploit NMR to check the constitution and the binding of molecules. quantity III/35 ''NMR-Data'' is split into a number of subvolumes and components. Subvolume III/35A comprises the nuclei B-11 and P-31, subvolume III/35B includes the nuclei F-19 and N-15, subvolume III/35C includes the nucleus H-1, subvolume III/35D comprises the nucleus C-13, subvolume III/35E includes the nucleus O-17, subvolume III/35F includes the nucleus Si-29, and subvolume III/35G includes the nucleus Se-77. extra nuclei can be offered later.

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F b a Transition metal complexes of silylenes displaying at least a coordination number of five around the silicon atom (see Fig. 38) are quite ununsual [00S1]. H7C3 H7C3 H7C3 C6H13 H7C3 C3H7 H13C6 Si P Pt P H7C3 Landolt-Börnstein New Series III/35F P Pt P Si C3H7 H13C6 C3H7 C6H13 H7C3 C3H7 C3H7 C3H7 Fig. 38. Compound with δ = –93 ppm. : J. Am Chem. Soc. 68 (1946) 171. : Phys. Rev. 78 (1950) 699. : Disc. Faraday Soc. 34 (1962) 7. : J. Chem. Phys. 40 (1964) 1714. : J. Chem. Phys. 40 (1964) 2285. : Inorg.

A short overview about literature for disilenes was recently reported by Kira [03K1]. From the NMR point of view, three classes of chemical shifts can be distinguished. The first involves compounds with (except the doubly bonded silicon) aromatic substituents such as 2,4,6-(Me3Si)3C6H2 (Tp), 2,4,6-i-Pr3C6H2 (Tip, or isityl), 2,4,6-Me3C6H2 (Mes), or 2,6-Me2C6H3 (Xyl), see Fig. 26. Here, comparatively small shifts to lower field (50 to 66 ppm) are observed. Si Si Si Si Si Si Si a Tp b Tip c Mes d Xyl Fig.

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