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Synthesis and characterization of new photoswitchable azobenzene-containing poly( -caprolactones)Electronic supplementary information (ESI) available: Detailed NMR analysis of 4-azidobenzoic acid, 4-azidobezoylchloride, PCL-alkyne3, cpd. 1, cpd. 2 and cpd. 3; H/H-COSY of polymer-1b; TGA curves; FTIR experiments and ESI-TOF MS of polymer 1. See DOI: 10.1039/c5ra25216d

A novel and efficient strategy in obtaining series of mono- and bi-armed azobenzene-containing poly( -caprolactone)s is described, starting from a commercially available azobenzene dye via azide/alkyne-"click"-reactions. The attachment of alkyne-telechelic poly( -caprolactone)s (1 kDa and...

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Main Authors: Appiah, Clement, Siefermann, Katrin R, Jorewitz, Marcel, Barqawi, Haitham, Binder, Wolfgang H
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Summary:A novel and efficient strategy in obtaining series of mono- and bi-armed azobenzene-containing poly( -caprolactone)s is described, starting from a commercially available azobenzene dye via azide/alkyne-"click"-reactions. The attachment of alkyne-telechelic poly( -caprolactone)s (1 kDa and 3 kDa), followed by chromatographic separation, allowed the attachment of either one or two PCl-chains to either side of the azobenzene-dye. The resulting mono- and bi-armed photo-switchable polymers are fully characterized by 2D-NMR techniques and show a high thermal stability. Additionally liquid chromatography at critical conditions (LCCC) coupled to ESI-TOF allowed us to prove the presence of either one or two polymer chains affixed onto the central azobenzene dye. A novel and efficient strategy in obtaining mono- and bi-armed azobenzene-containing poly( -caprolactone)s is described, starting from a commercially available azobenzene dye.
ISSN:2046-2069
DOI:10.1039/c5ra25216d