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Synthesis Of Pyrene End‐capped A6 Dendrimer And Star Polymer With Phosphazene Core Via “click Chemistry”

Mesut Gorur, F. Yilmaz, A. Kılıç, Zeynep Munteha Sahin, A. Demirci
Published 2011 · Chemistry

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Novel hexa-armed and pyrene (Pyr) end-capped phosphazene dendrimer [N 3 P 3 -(Pyr) 6 ] and star polymer with poly(e-caprolactone) (PCL) arms [N 3 P 3 -(PCL-Pyr) 6 ] were prepared via two series of reactions. In these series, core-first approach was used starting from a hexa-hydroxy functional phosphazene derivative (N 3 P 3 -(OH) 6 ). It was used as an initiator in the ring-opening polymerization of e-caprolactone to prepare a hexa-armed PCL star polymer (N 3 P 3 -(PCL-OH) 6 ). Hydroxyl functionalities of N 3 P 3 -(OH) 6 and N 3 P 3 -(PCL-OH) 6 were then successfully converted into bromide and azide, in turn. Further end-group modifications of azide functional dendrimer precursor (N 3 P 3 -(N 3 ) 6 ) and star polymer (N 3 P 3 -(PCL-N 3 ) 6 ) were achieved quantitatively via the Cu(I) catalyzed click reaction between azide functional groups and 1-ethynyl pyrene in the final step. Moreover, the pyrene end-capped phosphazene dendrimer and star polymer were used in noncovalent functionalization of multiwalled carbon nanotubes.
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