Journal
CHEMPLUSCHEM
Volume 84, Issue 8, Pages 1145-1148Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201900330
Keywords
azobenzene; London dispersions; thermal energy storage; molecular switches; noncovalent interactions
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Funding
- DFG [WE 5601/6-1, SPP 1807]
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The performance of molecular solar thermal energy storage systems (MOST) depends amongst others on the amount of energy stored. Azobenzenes have been investigated as high-potential materials for MOST applications. In the present study it could be shown that intermolecular attractive London dispersion interactions stabilize the (E)-isomer in bisazobenzene that is linked by different alkyl bridges. Differential scanning calorimetry (DSC) measurements revealed, that this interaction leads to an increased storage energy per azo-unit of more than 3 kcal/mol compared to the parent azobenzene. The origin of this effect has been supported by computation as well as X-ray analysis. In the solid state structure attractive London dispersion interactions between the C-H of the alkyl bridge and the pi-system of the azobenzene could be clearly assigned. This concept will be highly useful in designing more effective MOST systems in the future.
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