Photocontrolled ring-opening polymerization of strained dicarba[2]ferrocenophanes: a route to well-defined polyferrocenylethylene homopolymers and block copolymers.
Photocontrolled ring-opening polymerization of strained dicarba[2]ferrocenophanes: a route to well-defined polyferrocenylethylene homopolymers and block copolymers.
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应变二碳[2]二茂铁的光控开环聚合:获得明确的聚二茂铁乙烯均聚物和嵌段共聚物的途径。
DOI:
10.1002/chem.200901311
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Herbert DE
中科院分区:
文献类型:
--
作者:
Herbert DE
The ring‐opening polymerization (ROP) behavior of a variety of substituted 1,1′‐ethylenylferrocenes, or dicarba[2]ferrocenophanes, is reported. The electronic absorption spectra and tilted solid‐state structures of the monomersrac‐[Fe(η5‐C5H4)2(CHiPr)2] (7), [Fe(η5‐C5H4)2(C(H)MeCH2)] (8), andrac‐[Fe(η5‐C5H4)2(CHPh)2] (9) are consistent with the presence of substantial ring strain, which was exploited to synthesize soluble, well‐defined polyferrocenylethylenes (PFEs) [Fe(η5‐C5H4)2(C(H)MeCH2)]n(12) and [Fe(η5‐C5H4)2(CHPh)2]n(13) through photocontrolled ROP. Polymer chain lengths could be controlled by the monomer‐to‐initiator ratio up to about 50 repeat units and, consistent with the “living” nature of the polymerizations, sequential block copolymerization with a sila[1]ferrocenophane led to polyferrocenylethylene–polyferrocenylsilane (PFE‐b‐PFS) block copolymers (14and15). PFE polymers12and13showed two reversible oxidation waves, indicative of appreciable Fe⋅⋅⋅Fe interactions along the polymer backbone. The diblock copolymers were characterized by NMR spectroscopy, GPC analysis, and cyclic voltammetry.
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