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Meyer-Ilse J.,Friedrich - Schiller University of Jena | Meyer-Ilse J.,Institute of Photonic Technology | Bauroth S.,Friedrich - Schiller University of Jena | Bauroth S.,Institute of Photonic Technology | And 14 more authors.
Dalton Transactions | Year: 2014

The photophysical properties of Ruthenium-bipyridine complexes bearing a bibenzimidazole ligand were investigated. The nitrogens on the bibenzimidazole-ligand were protected, by adding either a phenylene group or a 1,2-ethandiyl group, to remove the photophysical dependence of the complex on the protonation state of the bibenzimidazole ligand. This protection results in the bibenzimidazole ligand contributing to the MLCT transition, which is experimentally evidenced by (resonance) Raman scattering in concert with DFT calculations for a detailed mode assignment in the (resonance) Raman spectra. This journal is © The Royal Society of Chemistry. © The Royal Society of Chemistry 2014.


Larsen F.H.,Copenhagen University | Schobitz M.,Thuringisches Institute For Textil Und Kunststoff Forschung E V | Schobitz M.,Institute of Organic Chemistry and Macromolecular Chemical | Schaller J.,Thuringisches Institute For Textil Und Kunststoff Forschung E V
Carbohydrate Polymers | Year: 2012

The hydration properties of 2,3-O-hydroxypropylcellulose (HPC) and 2,3-O-hydroxyethylcellulose (HEC) were analyzed by multi-nuclear solid-state MAS NMR spectroscopy. By 13C single-pulse (SP) MAS and cross-polarization (CP) MAS NMR, differences between the immobile regions and all parts of the polysaccharides were detected as a function of hydration. Complementary information about the water environments was observed by 2H MAS NMR. By this approach it was demonstrated that side chains in 2,3-O-HPC and 2,3-O-HEC were easier to hydrate than the cellulose backbone. Furthermore the motion of water was more restricted (slower) in 2,3-O-HPC than in 2,3-O-HEC. For both polysaccharides the hydration could be explained by a two-step process: in step one increased ordering of the immobile regions occurs after which the entire polymer is hydrated in step two. © 2012 Elsevier Ltd. All rights reserved.

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