Preparations, vibrational spectra, and Mössbauer spectra of tin(II) species of the types SnX3– and SnX2Y–(X, Y = Cl, Br, or I)

Abstract

A series of tin(II) salts of the types Et₄N[SnX₃] and Et₄N[SnX₂Y](X, Y = Cl, Br, or I) have been prepared, the latter for the first time. The salts are all sensitive to oxygen, their stability in this regard decreasing from SnCl₃^– to SnX₂Y^– to Snl₃^–. The i.r. and Raman spectra of the ions have been recorded both in the solid state and also where possible in nitromethane solution. There are signification differences between the data pertaining to the two states, and only in solution is it clear that discrete, pyramidal anions are present. The Mössbauer spectra of the salts yield isomer shifts in the range 3·47–3·95 mm./sec. relative to SnO₂; the shifts for the SnX₃^– ions increase as the sums of the electronegativites of the attached halogen atoms decrease.