A supramolecular miktoarm star polymer based on porphyrin metal complexation in water

Zhanyao Hou; Wim Dehaen; Joël Lyskawa; Patrice Woisel; Richard Hoogenboom

doi:10.1039/c7cc03128a

A supramolecular miktoarm star polymer based on porphyrin metal complexation in water

Chem Commun (Camb). 2017 Jul 25;53(60):8423-8426. doi: 10.1039/c7cc03128a.

Authors

Zhanyao Hou¹, Wim Dehaen², Joël Lyskawa³, Patrice Woisel³, Richard Hoogenboom¹

Affiliations

¹ Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B9000 Ghent, Belgium. [email protected].
² Department of Chemistry, KU Leuven, Celestijnenlaan 200f-bus 02404, 3001 Leuven, Belgium.
³ University of Lille, Unité des Matériaux et Transformations (UMET), CNRS UMR 8207, ENSCL 59655 Villeneuve d'Ascq Cedex, France.

PMID: 28702532
DOI: 10.1039/c7cc03128a

Abstract

A novel supramolecular miktoarm star polymer was successfully constructed in water from a pyridine end-decorated polymer (Py-PmDEGA) and a metalloporphyrin based star polymer (ZnTPP-(PEG)₄) via metal-ligand coordination. The Py-PmDEGA moiety was prepared via a combination of reversible addition-fragmentation chain transfer polymerization (RAFT) and subsequent aminolysis and Michael addition reactions to introduce the pyridine end-group. The ZnTPP(PEG)₄ star-polymer was synthesized by the reaction between tetrakis(p-hydroxyphenyl)porphyrin and toluenesulfonyl-PEG, followed by insertion of a zinc ion into the porphyrin core. The formation of a well-defined supramolecular AB₄-type miktoarm star polymer was unambiguously demonstrated via UV-Vis spectroscopic titration, isothermal titration calorimetry (ITC) and diffusion ordered NMR spectroscopy (DOSY).