Abstract
A series of high molecular weight poly(ferrocenylgermanes) [Fe(η-C5H3X)2GeR2]n 5a−d (X = H; a, R = Me; b, R = Et; c, R = n-Bu; d, R = Ph) and 7 (X = SiMe3, R = Me) were synthesized via the thermal ring-opening polymerization of the corresponding germanium-bridged [1]ferrocenophanes 4a−d and 6. Poly(ferrocenyldimethylsilane)−poly(ferrocenyldimethylgermane) random copolymer 8 was obtained by the thermal and transition metal-catalyzed ring-opening polymerization of a mixture of the [1]germaferrocenophane [Fe(η-C5H4)2GeMe2] (4a) and the corresponding [1]silaferrocenophane [Fe(η-C5H4)2SiMe2] (2a). The molecular weights for the homo- and copolymers were estimated by gel permeation chromatography in THF versus polystyrene standards and were found to be in the range of Mw = 5.0 × 104−2.0 × 106 and with polydispersities in the range of Mw/Mn = 1.2−2.4. A low-angle laser light scattering study of 5a in THF gave an absolute value of Mw of 3.3 × 106, which was significantly greater than the GPC estimate (Mw = 8.2 × 1...
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