G. Calleja et al., Synthesis of poly(ferrocenyldialkoxysilane) polymers and their introduction into oxide matrices, J ORGMET CH, 621(1-2), 2001, pp. 46-54
The synthesis of 1, 1'-ferrocenediyldialkoxysilanes Fe(eta -C5H4)(2)Si(OR)(
2) M2-M5 (R = i-Pr, t-Bu, PhCH2, Me), consisting of the reaction between 1.
1'-ferrocenediyldichlorosilane with the selected alcohols, is described. Th
e thermal ring opening polymerisation of M2-M5 yielded the corresponding po
ly(ferrocenylsilane) polymers P2-P5. These linear polymers were soluble in
polar solvents and exhibited high molecular weights. The monomers M2 and M4
were introduced into a silica matrix by a non-hydrolytic sol-gel process.
However, Si-C bond breaking was observed due to the electrophilic ipso subs
titution. Polymers P3 and P4 were easily condensed with SiBr4. When P3 was
condensed with TiCl4 and AlCl3, degradation of the polymer occurred. Intere
stingly, the hydrolytic sol-gel polycondensation of polymers P2, P4 and P5
yielded a completely polycondensed hybrid solid, without significant specif
ic surface area and with conservation of the electrochemical properties. (C
) 2001 Elsevier Science B.V. All rights reserved.