In randomly oriented polycrystalline samples, the probability of the two transitions for quadrupolar interactions of 119Sn is the same and therefore the two lines should have the same intensity, resulting in a symmetric doublet. Several cases taken from the divalent tin materials prepared in our laboratory depart from the expected symmetric doublet: (i) case of a non-stereoactive electron lone pair on tin: single line spectrum; (ii) case of a stereoactive lone pair resulting in highly preferred orientation: strongly asymmetric doublet, varying with the orientation of the sample in the γ-ray beam, similar to the case of a single crystal; (iii) case of a stereoactive lone pair resulting in high bonding anisotropy: asymmetric doublet, varying with temperature (Goldanskii-Karyagin effect); (iv) case of a mixture of the two kinds of tin(II), i.e., with a non-stereoactive lone pair and with a stereoactive lone pair, giving spectra varying from a very highly asymmetric doublet to a single line, without significant line broadening.
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