Vorträge-Koll

Tom Bergmann: Cooperative Light-Driven Hydrodefluorination by a Ce(III)–Rh(−I) Heterobimetallic Complex In recent years, the use of Lewis acidic metals as Z-type ligands to modulate the electronic properties of transition metal (TM) complexes has gained significant interest. However, examples for incorporation of lanthanides and especially cerium into bimetallic complexes remain scarce. Julia Schwärecke: Ligand field analysis for lanthanoids: Why?" To a zeroth approximation the electronic structure of lanthanoid ions in a chemical environment can be regarded as being very similar to that of the free ions. This led, falsely so, to the simplification that ligand field effects do not exist or are irrelevantly small for lanthanoids.

Sadeep Kumar: Low-Valent Heavier Tetrel Compounds Supported by N-heterocyclic Carbenes: A Comprehensive Experimental and Theoretical Perusal 2-tetrelavinylidenes (C=EH2; E = Si, Ge) are according to quantum chemical studies the least stable isomers on the [E,C,2H] potential energy hypersurface isomerizing easily via the trans-bent tetrelaacetylenes HE≡CH to the thermodynamically most stable 1-tetrelavinylidenes (E=CH2). Giacomo Puglise: Homogeneous catalysis is an essential tool for organic synthesis, which allows synthetic chemists to draw new and efficient disconnections for the manufacture of drugs and agrochemicals.

Metal-Free Molecules as Electrocatalysts and Co-electrocatalysts There is continuously expanding interest in developing new electrocatalytic processes as an approach to harness intermittent electricity from renewable sources. Molecular systems are useful to understand and develop fundamental principles of these reactions through mechanistic study, as well as offer the possibility for testing structure-function relationships through iterative synthetic design. Broadly, the fundamental understanding of molecular species as electrocatalysts has relevance to the interconversion of electricity and chemical energy, as well as commodity chemical production. However, in order for homogeneous systems to eventually be scalable, their activity and stability must be improved. In naturally occurring enzymes, redox equivalents (electrons, often in a concerted manner with protons) are delivered to enzyme active sites by small molecules known as redox mediators (RMs).

Prof. Dr. Douglas Philp, University of St Andrews, UK: Title to be announced .........................

Prof. Dr. Yang Yang, UC Santa Barbara, USA Titel wird noch bekannt gegeben ...................................

From molecules to materials: structure-property correlation in functional materials Functional molecular materials are at the heart of emerging technologies in sensing, optoelectronics, and smart materials. Their macroscopic properties often result from collective phenomena in the solid state, making their rational design both complex and rewarding. This seminar will focus on the development and understanding of such materials through a multidisciplinary approach combining synthesis, quantum crystallography, and theoretical modeling. A central theme will be the exploration of structure–property relationships in the crystalline phase, with emphasis on how non-covalent interactions drive self-assembly and control photophysical properties. Luminescent materials exhibiting aggregation-induced emission (AIE) will be presented as model systems, alongside pressure-responsive systems showing pressure-induced emission enhancement (PIEE).

Prof. Dr. Giovanni Appendino, Università del Piemonte Orientale, Novara, Italy: The lab is a curious place. Things that shaped chemistry and you would not believe could have happened there

Crossing the Border - Structural Chemistry around the Zintl Line Alkali metal Zintl phases can be traced back to the investigative works of Eduard Zintl himself, who reported on the structural characterization of textbook-known sodium thallide (NaTl) already in 1932. Interestingly, thallium, as a group 13 element, is located to the left of the so-called Zintl line, which separates the p-block elements concerning the formation of either salt(-like) or metallic compounds in intermetallic materials of the alkali or alkaline earth metals. In my talk, we will cross the Zintl-line. Solution and crystallization studies of group 14 element Zintl salts in liquid ammonia will be introduced.