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|Title:||Norbornadiene-based photoswitches with exceptional combination of solar spectrum match and long-term energy storage|
|Citation:||Chemistry - A European Journal, 2018; 24(49):12767-12772|
|Martyn Jevric, Anne U. Petersen, Mads Mansø, Sandeep Kumar Singh, Zhihang Wang, Ambra Dreos, Christopher Sumby, Mogens Brønds Nielsen, Karl Börjesson, Paul Erhart and Kasper Moth-Poulsen|
|Abstract:||Norbornadiene-quadricyclane (NBD-QC) photoswitches are candidates for applications in solar thermal energy storage. Functionally, they rely on an intramolecular [2+2] cycloaddition reaction, which couples the S0 landscape on the NBD side to the S1 landscape on the QC side of the reaction and vice-versa. This commonly results in an unfavourable correlation between the first absorption maximum and the barrier for thermal back-conversion. This work demonstrates that this correlation can be counteracted by using steric repulsion to hamper the rotational motion of the side groups along the back-conversion path. It is shown that this modification reduces the correlation between the effective back-conversion barrier and the first absorption maximum and also increases the back-conversion entropy. The resulting molecules exhibit exceptionally long half-lives for their metastable forms without significantly affecting other properties, most notably solar spectrum match and storage density.|
|Keywords:||Energy storage; molecular photoswitches; norbornadienes; quadricyclane; solar energy|
|Rights:||© 2018 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim.|
|Appears in Collections:||Chemistry and Physics publications|
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