A thermal analytical study of some mono‐ and di‐organotin oxides and carboxylates

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Abstract
Simultaneous thermogravimetry and differential thermal analysis studies on a variety of mono‐ and di‐organotin oxides and carboxylates were performed; for the carboxylates, these studies followed 119Sn NMR spectroscopic investigation. All the organotin compounds thermally degrade to tin (;IV) oxide (;SnO2) in either air or oxygen, as was confirmed by Mössbauer spectroscopy in the cases of RSn(;O)OH (;R=butyl, octyl) and Bu2SnO.The organotins are less stable than previously believed since evidence for degradation was obtained in many cases at approximately 160–170 °C.In addition it was found that oxygen influences the thermal stability of the organotins, since Bu2SnO did not degrade when heated for 1 h at 280 °C under nitrogen, yet readily broke down at 170 °C in air. Furthermore, pure oxygen had the effect of lowering reaction temperatures by approximately 10–12°C compared with those in air.