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A Stable Manganese Pincer Catalyst for the Selective Dehydrogenation of Methanol
2016-12-2, Andérez-Fernández, María, Vogt, Lydia K., Fischer, Steffen, Zhou, Wei, Jiao, Haijun, Garbe, Marcel, Elangovan, Saravanakumar, Junge, Kathrin, Junge, Henrik, Ludwig, Ralf, Beller, Matthias
For the first time, structurally defined manganese pincer complexes catalyze the dehydrogenation of aqueous methanol to hydrogen and carbon dioxide, which is a transformation of interest with regard to the implementation of a hydrogen and methanol economy. Excellent long-term stability was demonstrated for the Mn-PNPiPr catalyst, as a turnover of more than 20 000 was reached. In addition to methanol, other important hydrogen carriers were also successfully dehydrogenated.
Spectroscopic Evidence for Clusters of Like-Charged Ions in Ionic Liquids Stabilized by Cooperative Hydrogen Bonding
2016, Knorr, Anne, Stange, Peter, Fumino, Koichi, Weinhold, Frank, Ludwig, Ralf
Infrared spectroscopy and density functional theory calculations provide strong evidence for the formation of clusters of like-charged ions in ionic liquids. With decreasing temperature, cooperative hydrogen bonding overcomes repulsive electrostatic interaction. The resulting cyclic tetramers nicely resemble well-known molecular clusters of alcohols.