Abstract The application of Pd–polydopamine and magnetic Fe 3 O 4 @Pd–polydopamine catalysts in catalytic transfer hydrogenation reactions the Heck arylation is reported. reduction a wide range aromatic nitro‐compounds bearing both electron‐donating ‐withdrawing substituents to corresponding anilines could be efficiently performed, although carbonyl compounds was found less general. In latter case, only ketones reduced alcohols, whereas aldehyde substrates were unaffected, which may owing...

A novel water-soluble stilbene-type molecular photoswitch (CP) has been synthesized by attaching an N-methylpyridinium unit to 7-diethylamino-4-methylcoumarin (coumarin 1) via ethylene bridge. The photoisomerization cycle of CP and the spectroscopic properties two isomers were studied in acetonitrile water. In both solvents, illumination trans-CP with green light leads a photostationary state (PSS) 90% cis isomer irradiating then this PSS mixture near UV light, trans is almost fully...

A hybrid molecular switch comprising salicylideneaniline (SA) and dithienylethene (DTE) moieties around a single benzene ring is reported. Due to an interplay between solvent-assisted enol–keto tautomerization in the former moiety photochromic electrocyclization latter, this dithienylbenzene derivative was found be photoresponsive at room temperature with thermally stable closed form. The main photoproduct featuring ring-closed DTE keto-enamine SA structures could isolated converted back...

The construction of a donor-acceptor Stenhouse adduct molecular layer on gold surface is presented. To avoid the incompatibility thiol surface-binding group with polyene structure switch, an interfacial reaction approach was followed. Poly(dopamine)-supported nanoparticles quartz slides were chosen as substrates, which expected to facilitate both and switching process by providing favorable steric conditions due curved particle surface. between surface-bound donor half CF

Herein, the design and synthesis of a click-derived Pd-complex merged with photoswitchable azobenzene unit is presented. While in trans-form switch complex showed limited solubility, photogenerated cis-form rendered molecule soluble polar solvents. This light-controllable solubility was exploited to affect catalytic activity Suzuki coupling reaction. The effect substrate catalyst concentration light intensity on proceeding outcome reaction studied. Dehalogenation aryl iodide starting...

Stable azaheterocyclic derivatives of pentalene have been reported by the group Hafner in 1970s, however, these structures remained low interest until recently. Herein, we revisit synthesis stable azapentalene derivative 1,3-bis(dimethylamino)-2-azapentalene and further explore its properties both computationally experimentally. Beyond reproduction optimiza-tion some previously transformations, such as formylation amine substitution, available scope reactions was expanded with azo-coupling,...

Abstract The facile preparation of dynamic interfaces is presented based on the combination photoisomerizable azobenzenes and polydopamine (PDA)/Au nanoparticle composite materials. Azobenzenes with different spacer lengths (C 3 , C 6 ) surface‐binding groups (SH, NH 2 were synthesized. polymer layer macroscopic quartz surface was prepared by aerobic autopolymerisation dopamine hydrochloride under basic conditions. presence redox‐active catechol moieties meant that gold nanoparticles formed...

Polydopamine, a ‘mussel-inspired’ polymer, has been explored extensively in materials science as universal coating. However, an easily available, stable and environmentally benign material, it recently discovered to demonstrate catalytic applications. In this short review, we briefly discuss the main approaches employing polydopamine catalysis of organic transformations. These include metal/polydopamine-type systems metal-free that exploit acid/base properties versatile polymer. 1...

The effect of catalyst restructuring on the polydopamine-supported Pd catalyzed transfer hydrogenation ethyl 4-nitrobenzoate and catalytic (E)-2-methyl-2-butenoic acid is reported. Transmission electron microscopy investigation different pre-treatment reaction conditions revealed high activity in both reactions unless drastic aggregation active metal occurred. In was primarily dependent H-source used, while additives combination with reductive environment led to extensive thus decreased...

Abstract The investigation of the biphenylene (BP)‐tetracyanoethylene (TCNE) π‐molecular complex is reported. first study on this appeared in 1961 and was considered as a charge transfer with symmetric, co‐planar arrangement components. Moreover, it assumed that not only dictated by formation Mulliken‐type donor‐acceptor complex, but also electronic stabilization ‘cyclobutadieneoid’ central ring through formation. Yet, crystal structure associated computational analysis have verified these...

Morphologically different gold nanoparticle (AuNP) aggregates were prepared on macroscopic surfaces covered with a layer of polydopamine (PDA). The extent particle aggregation and the size distribution could be controlled by Au(III) reduction times, while process was triggered solely redox active polymer. Shorter reaction times led to smaller particles along lower levels aggregation, longer reductions resulted in larger average diameter heavier aggregation. characterized UV-Vis, AFM KPFM...

Stable azaheterocyclic derivatives of pentalene have been reported by the group Hafner in 1970s. However, these structures remained low interest until recently, when they started to be investigated context organic light-emitting diodes' (OLEDs') development. Herein, we revisit synthesis stable azapentalene derivative 1,3-bis(dimethylamino)-2-azapentalene and further explore its properties both computationally experimentally. Beyond reproduction optimization some previously transformations,...

Abstract Molecular complexes based on donor-acceptor interactions that involve π-systems with antiaromatic character are rarely studied. Herein, we report the synthesis of biphenylene derivatives as potential electron donor components in π-complexes. Molecules two connected units suitable to probe formation differently folded solution, while a pendant triethoxysilane group can be used functionalize solid surfaces and interfacial complex formation. Our results show clear indication solution;...

The Cover Feature shows the ligand-exchange-based molecular restructuring process of an azobenzene-functionalized macroscopic solid surface. Polydopamine-supported gold nanoparticles not only provide sufficient free volume for reversible azobenzene photoisomerization, but also facilitate ligand-exchange between differently substituted switches. More information can be found in Full Paper by G. London and co-workers (DOI: 10.1002/cplu.201900674).