Polystannanes, characterization

Polystannanes are routinely characterized by and spectroscopy, and (GPC) against polystyrene standards of different molecular weights in THF. However, it is often " Sn NMR in particular that is a valuable tool to determine the structure of the linear oligomeric and polymeric chains and provides useful information regarding purity of polymer chains and ratios and types of cyclic oligomers. 

Recently, Deacon, Price, and coworkers reported the synthesis and study of polymers containing triphenyl and tributyltin as side chains and of polystannanes produced using the Wurtz polymerization [59]. The polystannanes were characterized employing Mossbauer spectroscopy. The polystannane shown below exhibits some liquid-crystal behavior. The products have weight average molecular weights of 2.5 10. The coordination number for tin is 4 with the tin present as a distorted tetrahedral geometry (4). 

ABSTRACT. Several new classes of polycyclic polystannanes have been prepared and these compounds have been fully characterized by spectroscopic methods, including crystallographic analysis. The information obtained horn these investigations should prove useful in predicting the structure and properties of extended macroscopic materials containing tin, such as the currently unknown polystannynes, [RSn]n-... 

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