The dehydropolymerization of BunnSnH2, catalysed by [Zr(C5H5)(C5Me5){Si(SiMe3)3}Me], produces cyclic (SnBun2), oligomers and long H(SnBun2),H polystannane chains (MJM, = 17 500/7800), which exhibit a long-wavelength electronic absorption (Amax = 382 nm) and emit green light (Amax = 505 nm; 337.1 nm excitation).The recent discovery and rapid development of polysilane high polymers can be attributed largely to the interesting electronic properties which these materials possess. 1 Polysilanes exhibit a strong near-UV absorption that results from o-conjugation along the silicon backbone. The radiation-sensitivity associated with excitation of this transition makes these polymers suitable for applications in microlithography .Also, owing to their delocalized electronic structure and relatively narrow band gap (ca. 4 eV), polysilanes provide a new class of photoconducting and charge-transporting poly-
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