Effiziente Umwandlung von Licht in chemische Energie: Gerichtete, chirale Photoschalter mit sehr hohen Quantenausbeuten

Spin Switching with Triazolate-Strapped Ferrous Porphyrins

Fe(III) porphyrins bridged with 1,2,3-triazole ligands were synthesized. Upon deprotonation, the triazolate ion coordinates to the Fe(III) ion, forming an overall neutral high-spin Fe(III) porphyrin in which the triazolate serves both as an axial ligand and as the counterion. The second axial coordination site is activated for coordination and binds p-methoxypyridine, forming a six-coordinate low-spin complex. Upon addition of a phenylazopyridine as a photodissociable ligand, the spin state of the complex can be reversibly switched with ultraviolet and visible light. The system provides the basis for the development of switchable catalase- and peroxidase-type catalysts and molecular spin sw…

Efficient Conversion of Light to Chemical Energy : Directional, Chiral Photoswitches with Very High Quantum Yields

Abstract Photochromic systems have been used to achieve a number of engineering functions such as light energy conversion, molecular motors, pumps, actuators, and sensors. Key to practical applications is a high efficiency in the conversion of light to chemical energy, a rigid structure for the transmission of force to the environment, and directed motion during isomerization. We present a novel type of photochromic system (diindane diazocines) that converts visible light with an efficiency of 18 % to chemical energy. Quantum yields are exceptionally high with >70 % for the cis–trans isomerization and 90 % for the back‐reaction and thus higher than the biochemical system rhodopsin (64 %). T…

CCDC 1885475: Experimental Crystal Structure Determination

Related Article: Morten K. Peters, Sebastian Hamer, Torben Jäkel, Fynn Röhricht, Frank D. Sönnichsen, Carolina von Essen, Manu Lahtinen, Christian Naether, Kari Rissanen, Rainer Herges|2019|Inorg.Chem.|58|5265|doi:10.1021/acs.inorgchem.9b00349

CCDC 1884544: Experimental Crystal Structure Determination

Related Article: Morten K. Peters, Sebastian Hamer, Torben Jäkel, Fynn Röhricht, Frank D. Sönnichsen, Carolina von Essen, Manu Lahtinen, Christian Naether, Kari Rissanen, Rainer Herges|2019|Inorg.Chem.|58|5265|doi:10.1021/acs.inorgchem.9b00349