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:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
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通讯作者:
Herbert DE
Herbert DE
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文献类型:
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作者:
Herbert DE

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报道了各种取代的1,1‘-亚乙基二茂铁或二碳二茂铁的开环聚合(ROP)行为。[Fe(η5-C5H4)2(CHIPr)2](7)、[Fe(η5-C5H4)2(C(H)MeCH2)](8)、[Fe(η5-C5H4)2(CHPh)2](9)的电子吸收光谱和倾斜固相结构与环状应变相一致。通过光控ROP得到了定义良好的聚二茂铁乙烯[Fe(η5-C5H4)2(C(H)MeCH2)]n(12)和[Fe(η5-C5H4)2(CHPh)2]n(13)。聚合物的链长可由单体与引发剂的比例控制,最高可达50个重复单元,与聚合的“活性”性质一致,与二茂铁环的顺序嵌段共聚导致聚二茂铁乙烯-聚二茂铁基硅烷(PFE-b-PFS)嵌段共聚物(14和15)。PFE聚合物12和13出现了两个可逆的氧化波,表明沿聚合物主链有明显的Fe-⋅⋅⋅-Fe相互作用。用核磁共振波谱、凝胶渗透色谱(GPC)和循环伏安法对两嵌段共聚物进行了表征。
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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