Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 10, Pages 3240-3250Publisher
WILEY-BLACKWELL
DOI: 10.1002/chem.200902886
Keywords
block copolymers; metallopolymers; phosphanes; photolysis; self-assembly
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Funding
- EPSRC
- European Union for a Marie Curie Chair
- Royal Society for it Wolfson Research Merit Award
- Hong Kong Research Grants Council [HKBU202508]
- Hong Kong Baptist University [FRG/07-08/II-65]
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Phosphorus-bridged strained [1]ferrocenophanes [Fe{(eta-C(5)H(4))(2)P-(CH(2)CMe(3))}] (2) and [Fe{(eta-C(5)H(4))(2)P- (CH(2)SiMe(3))}] (3) with neopentyl and (trimethylsilyl)methyl substituents oil phosphorus, respectively, have been synthesized and characterized. Photocontrolled living anionic ring-opening polymerization (ROP) of the known phosphorus-bridged [1]ferrocenophane [Fe{(eta-C(5)H(4))(2)P(CMe(3))}] (1) and the new monomers 2 and 3, initiated by Na[C(5)H(5)] in THF at 5 degrees C, yielded well-defined polyferrocenylphosphines (PFPs), [Fe{(eta-C(5)H(4))(2)PR}](n) (R=CMe(3) (4), CH(2)CMe(3) (5), and CH(2)SiMe(3) (6)), with controlled molecular weights (up to ca. 60 x 10(3) Da) and narrow molecular weight distributions. The PFPs 4-6 were characterized by multinuclear NMR spectroscopy, DSC, and by GPC analysis of the corresponding poly(ferrocenylphosphine sulfides) obtained by sulfurization of the phosphorus(III) centers. The living nature of the photocontrolled anionic ROP allowed the synthesis of well-defined all-organometallic PFP-b-PFS(F) (7a and 7b) (PFS(F)=polyferrocenylmethyl(3,3,3,-trifluoropropyl)silane) diblock copolymers through sequential monomer addition. TEM studies of the thin films of the diblock copolymer 7b showed microphase separation to form cylindrical PFS(F) domains in a PFP matrix.
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