The 119Sn Mössbauer data and electronic reflectance spectra of the cubic caesium tin(II) halides CsSn Br3 –xClx(x= 0–3) and their behaviour on heating suggest that the non-bonding tin(II) electrons may be involved in a band structure rather than being located in non-bonding molecular orbitals in these materials.
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Barrett et al. (1971) studied this question.