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Remarkably, the first preparation of oligo- or polystannanes was published by Löwig already in 1852 , only 2 years after Franklands report  on the isolation of organotin compounds (considered to be the first publication on such compounds). Löwig prepared oligo- or polystannanes by an exothermic reaction of iodoethane with a Sn/K or a Sn/Na alloy, in the presence of quartz sand which was used to control the reaction rate. After work-up of the reaction mixture, fractions of organotin compounds with elemental compositions close to those of oligo(diethylstannane)s or poly(diethylstannane) were obtained. Cahours [3, 4] obtained similar products and attributed the formation of the so-called stannic ethyl to a reaction of the Wurtz type. Interestingly, already in 1858, stannic ethyl was formulated as a polymeric compound denoted with the composition n(SnC4H5) . In 1917 Grüttner , who reinvestigated results on hexaethyl-distannanes(H5C2)3Sn-Sn(C2H5)3 reported by Ladenburg in 1870  confirmed the presence of Sn-Sn bonds and predicated for the first time that tin could form chain like compounds. In 1943, it was postulated that “diphenyltin” exists as a type of polymeric material because of its yellow color , and indeed a bathochromic shift of the wavelength at maximum absorption with increasing number of Sn atoms was found later in the case of oligo(dibutylstannane)s comprising up to 15 Sn atoms .
Synthesis and Characterization of Pure Linear Polystannanes
A facile dehydropolymerization of dialkytin dihydrides (R2SnH2) with Wilkinson’s catalyst, was found in 2005 , which provide polystannanes without detectable amounts of "cyclic"-byproducts. This convenient, rapid and high-yield synthesis was employed to produce a variety of polystannanes comprising different side groups. The polymers synthesized were of a yellow color, featured consistencies that ranged from soft to honey-like, number average molar masses of 10 to 70 kg/mol and a polydispersity of 2 – 3.
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Polystannane". A list of authors is available in Wikipedia.|