The hypercoordinated diorganotin(IV) chlorides [{2-(Me2NCH2)C6H4}-RSnCl2] [R = Ph, n-Bu, Me] were prepared from reported methods. These molecules feature 5-coordinate tin centres featuring strong Sn?N dative interactions. Similarly, a series of six coordinate organotin species [LR2SnCl2] where [L = Schiff base, R = Ph, n-Bu] were also synthesized and characterized by NMR (1H, 13C, 119Sn) spectroscopy.  These 5- or 6-coordinated tin dichlorides monomers can be polymerized via Wurtz coupling methods or further converted to their corresponding dihydrides and dehydropolymerized with suitable transition metal catalysts.  These hypercoordinated tin polymers are designed to protect the sensitive nature of the Sn-Sn bond in polystannanes by sterically hindering nucleophilic attack at Sn centers and acting as UV-Vis absorbers to ambient light sources.

Molecular cloaks for stable polystannanes

244th National Meeting (2012)

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