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Mansfeld U.,Laboratory of Organic and Macromolecular Chemical IOMC | Mansfeld U.,Dutch Polymer Institute | Hoeppener S.,Laboratory of Organic and Macromolecular Chemical IOMC | Hoeppener S.,Jena Center for Soft Matter | And 3 more authors.
Advanced Materials | Year: 2013

The movement of individual block copolymer micelles in free-standing films of ionic liquids is investigated by transmission electron microscopy with the aim of providing an easily accessible high-resolution imaging tool for the in situ observation of particle movement in a liquid environment. A proof of concept and first studies on the behavior of individual particles in the fluid are demonstrated. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Schulze M.,Friedrich - Schiller University of Jena | Jager M.,Friedrich - Schiller University of Jena | Schubert U.S.,Friedrich - Schiller University of Jena | Schubert U.S.,Jena Center for Soft Matter
Macromolecular Rapid Communications | Year: 2012

The incorporation of room-temperature red-emissive [Ru II(dqp) (dqp-CH 2OH)] 2+ (dqp is 2,6-di(quinolin-8-yl)pyridine) in poly(ε-caprolactone) (PCL) is explored following two routes. First, the ring-opening polymerization of ε-caprolactone is investigated using the free ligand and the complex as initiators. Alternatively, the complexation strategy utilizing PCL-dqp as a macroligand is detailed. Both routes yield room-temperature emissive polymers centered at 400 nm (free ligand) and 680 nm (complex) in aerated solvent. DSC and TGA showed the typical properties of PCL, for example, the melting point (59 °C). © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Wachtler M.,Friedrich - Schiller University of Jena | Wachtler M.,Institute of Photonic Technology | Kupfer S.,Friedrich - Schiller University of Jena | Guthmuller J.,Technical University of Gdansk | And 5 more authors.
Journal of Physical Chemistry C | Year: 2012

The photoinduced dynamics of a series of terpyridine 4H-imidazole-ruthenium complexes, which constitute a new family of panchromatic dyes, is investigated. The dynamics involves two excited states localized within the 4H-imidazole sphere. Upon MLCT excitation, an excited state is populated, which is localized on the central part of the 4H-imidazole ligand caused by its nonplanar conformation. The population of the second excited state is connected to a planarization of the 4H-imidazole ligand as revealed by viscosity-dependent measurements, and the excess electronic charge on the ligand is shifted to the terminal rings. The impact on the photoinduced dynamics of the electronic character of the substituent at the terminal rings and the protonation state of the 4H-imidazole ligand is studied. Significant changes in the lifetime of the excitation and alterations of the decay mechanism are observed depending on the interplay of the electronic character of the substituent and ligand protonation. In a NMe2 substituted complex, the character of the substituent is changed from electron donating to electron withdrawing upon stepwise protonation, resulting in pH switchable decay mechanism. © 2012 American Chemical Society.

Trautwein R.,Friedrich - Schiller University of Jena | Almazahreh L.R.,Friedrich - Schiller University of Jena | Gorls H.,Friedrich - Schiller University of Jena | Weigand W.,Friedrich - Schiller University of Jena | Weigand W.,Jena Center for Soft Matter
Zeitschrift fur Anorganische und Allgemeine Chemie | Year: 2013

[FeFe] hydrogenase model complexes [Fe(CO)3]2[(μ- ECH2)2C(CH2OH)2] (E = S (1) or Se (2)) containing CH2OH bridgehead substituents were synthesized via reaction of equimolar amounts of 4, 4-bis(hydroxymethyl)-1, 2-dithiolane (A) or 4, 4-bis(hydroxymethyl)-1, 2-diselenolane (B) with Fe3(CO) 12 in toluene at 100°C. The presence of OH groups in complexes 1 and 2 is found to influence the cathodic processes and their potentials. The catalytic reduction of acetic acid (AcOH) occurs by the anions 1- and 2-, while the neutral complexes are procatalysts. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Friebe C.,Friedrich - Schiller University of Jena | Hager M.D.,Friedrich - Schiller University of Jena | Winter A.,Friedrich - Schiller University of Jena | Schubert U.S.,Friedrich - Schiller University of Jena | And 2 more authors.
Advanced Materials | Year: 2012

Electropolymerization represents a suitable and well-established approach for the assembly of polymer structures, in particular with regard to the formation of thin, insoluble films. Utilization of monomers that are functionalized with metal complex units allows the combination of structural and functional benefits of polymers and metal moieties. Since a broad range of both electropolymerizable monomers and metal complexes are available, various structures and, thus, applications are possible. Recent developments in the field of synthesis and potential applications of metal-functionalized polymers obtained via electropolymerization are presented, highlighting the significant advances in this field of research. Electropolymerization of metal-containing monomers allows the formation of hybrid materials that combine advantageous properties of polymers and metal complex units. Varying monomer assemblies can lead to different types of metallopolymers featuring differing metal-polymer backbone interactions. Recent progress and trends concerning the electrochemical incorporation of metal complexes into polymer structures and their potential application possibilities are presented. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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