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- Title
Cyclic and Linear Polyferrocenes with Silicon and Tin as Alternating Bridges.
- Authors
Bagh, Bidraha; Breit, Nora C.; Dey, Subhayan; Gilroy, Joe B.; Schatte, Gabriele; Harms, Klaus; Müller, Jens
- Abstract
The synthesis and characterization of ferrocene-based oligomers that contained two different elements (Si and Sn) as alternating bridges is described for the first time. The salt-metathesis reaction of R2Si[(C5H4)Fe(C5H4Li)]2 (R=Me, Et) with R′2SnCl2 (R′=Me, nBu, tBu) afforded a mixture of oligomers ( 6MeSnMe2, 6EtSnMe2, 6MeSn nBu2, 6EtSn nBu2, 6MeSn tBu2, and 6EtSn tBu2). These oligomers were characterized by 1H, 13C, 29Si, and 119Sn NMR spectroscopy and by mass spectrometry. MS (MALDI-TOF) studies of 6EtSnMe2 revealed the presence of linear ( l) and cyclic ( c) species that contained up to 20 ferrocene moieties. The molecular weights of the polymers were determined by gel-permeation chromatography (GPC) and by dynamic-light scattering (DLS). GPC analysis revealed average molecular weights of 2100-6300 Da with respect to polystyrene as a standard. DLS analysis yielded very similar results. Some compounds, c -(6MeSnMe2)1, c -(6MeSn tBu2)2, c -(6EtSnMe2)1, c -(6EtSn tBu2)2, l -(6MeSn nBu2)2, and l -(6MeSn nBu2)3, which contained up to six ferrocene moieties, were isolated in their pure form either by column chromatography or by crystallization. The Si- and Sn-bridged macrocycles that contained four ferrocene units ( c-( 6MeSn tBu2)2 and c -(6EtSn tBu2)2) were structurally characterized by single-crystal X-ray analysis.
- Publication
Chemistry - A European Journal, 2012, Vol 18, Issue 31, p9722
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201200953