Mussel glue: Bioinspired underwater chemical bonding with the possibility of phototriggered debonding is reported. A four-arm star-poly(ethyleneglycol) endfunctionalized by nitrodopamine was synthesized. The nitrodopamine offered the reactivity of catechol and the chemistry of the photocleavable o-nitrophenyl ethyl group (see picture).

The intrinsic photoluminescence properties of hyperbranched polyethylenimines (PEIs) and their linear counterpart (LPEIs) have been studied in absence of any classical fluorescent probes. The comparison of the inherent fluorescence emission between hyperbranched polyethylenimines and their linear analogues demonstrates that linear polyamines are capable of producing strong intrinsic photoluminescence species having long excited lifetimes without need of having a tridimensional‐branched structure. The creation of inherently fluorescent polymeric centers from hyperbranched and linear polyethyleimines can be modulated by specific chemical modification and oxidation of amine groups as well as by adjusting the acidity of the polymer.magnified image

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Der Klebstoff von Muscheln: Eine bioinspirierte chemische Verklebung wird vorgestellt, die unter Wasser geknüpft und durch Bestrahlung mit Licht wieder gelöst werden kann. Zu diesem Zweck wurde ein vierarmiges Polyethylenglycol‐Sternpolymer mit Nitrodopamin‐Endgruppen bestückt, die zum einen als 1,2‐Dihydroxybenzol reagieren und zum anderen als photospaltbare o‐Nitrophenylethyl‐Gruppe wirken (siehe Bild).