By F. G. A. (Editor); West, Robert (Editor) Stone
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Extra resources for Advances in organometallic chemistry. / Volume 9
Other, more commonplace applications in tin chemistry and technology are sure to be developed. 5 . Cryostats (372) Most Mossbauer measurements on organotin compounds must be carried out at cryoscopic temperatures because of low recoil-free fractions at room temperature. Cooling with liquid nitrogen is always sufficient to produce a spectrum in reasonable time. The cryostat employed must incorporate thin transmission windows to avoid the absorption of lowenergy 'lgrnSny-rays. Glass dewars are thus of limited usefulness.
The product eQV,, is the quadrupole coupling constant. , even though in the case of tin-119 the nucleus has a quadrupole moment only in the excited state. Nuclear quadrupole resonance allows the determination of quadrupole interaction constants for nuclei which are quadrupolar in the ground state. Thus the two techniques complement one another. The sign of AEQ can be established by studying the relative intensities of the two lines of the doublet produced by a single-crystal absorber as a function of the angle of observation relative to known crystallographic axes or by the study of the relative intensities of the six lines of the spectrum produced in an applied magnetic field as discussed in Section III,C,3.
Change indicates a decrease in I#ns(0)12and it may be assumed that this represents an isotropic view of changes in selectron density at the tin-119 nucleus. The NMR coupling constant, J("9Sn-C--'H), however, based upon a predominant Fermi contact interaction mechanism, presumably represents a highly anisotropic view of s-electron density-namely, that directed along the axis of the tin bonding orbitals to carbon. J ( 119Sn-C--'H) increases continuously with coordination numbers (385) and this can be interpreted as arising from increasing concentration of s character in the tin-carbon bond.
Advances in organometallic chemistry. / Volume 9 by F. G. A. (Editor); West, Robert (Editor) Stone