Palladium-containing polymers via a combination of RAFT and triazole chemistry?

Polymer Chemistry Pub Date: 2012-06-22 DOI: 10.1039/C2PY20242E

Abstract

Polystyrene based copolymers with palladium-ligating side groups were obtained by RAFT polymerization of chloromethyl styrene and styrene, subsequent azide transformation and quantitative copper-mediated 1,3-dipolar cycloaddition of ethynyl pyridine. Variable copolymer compositions were synthesized ranging from 10% to 50% with respect to the fraction of the palladium-ligating comonomer. The successful loading of the polymers with PdCl2 employing [Pd(COD)Cl2] (COD = 1,5-cyclooctadiene) as the metal source was confirmed by nuclear magnetic resonance spectroscopy (NMR) and elemental analysis. Absolute molecular weights of the Pd-containing polymers ranging from Mw = 16?000 g mol?1 to 20?000 g mol?1 were determined by employing static light scattering (SLS). In order to fully clarify the incorporation of palladium into the polymers, a PdCl2 complex of a chelating N donor ligand featuring the characteristic heterocyclic donor functions used to incorporate PdCl2 in the polymer was synthesized and characterized by single crystal X-ray diffraction and NMR analysis.

Graphical abstract: Palladium-containing polymers via a combination of RAFT and triazole chemistry
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