made by various known methods see e g t iwahara 23 macromolecules 1298 1301 1990 precursor 34 y 34 of fig1 the monomer 1 4 diethynylbenzene was synthesized via the debromination of 1 4 bis 1 2 dibromoethyl benzene as has been detailed previously see e g a hay 25 j organometallic chem 637 638 1960 the 1 4 diiodothiophene and p diiodobenzene shown in fig1 were purchased from aldrich chemical co and tci america chemical co respectively for other polymer variants within the claims the starting compounds would be correspondingly purchased or synthesized using standard techniques in this regard techniques for changing the number of silicons in 34 x 34 or the silicon substituents are well known as are techniques for changing the r 4 group in 34 y 34 various polymerization techniques have been reported for other compounds see generally j wildeman et al 1 j inorg amp organometall poly 567 580 1991 t barton et al u s pat 5 243 060 r corriu et al 28 j poly science part c poly lett 431 437 1990 h dieck et al 93 j organometall chem 259 263 1975 and l cassar 93 j organometall chem 253 257 1975 we modified these techniques to render them suitable for our starting materials a mixture of 1 2 diethynyl 1 1 2 2 tetrabutyldisilane 0 67 g 2 mmol 1 4 diiodobenzene 1 32 g 4 mmol 1 4 diethynylbenzene 0 25 g 2 mmol cui 0 04 mmol 7 6 mg and pph 3 2 pdcl 2 0 004 mmol 2 8.