Tuning Molecular Solar Thermal Properties by Modification of a Promising Norbornadiene Photoswitch
Artikel i vetenskaplig tidskrift, 2019

Carefully targeted modifications to the norbornadiene-quadricyclane couple should give molecules with great potential for solar energy storage. Here we report the synthesis of derivatives of a well-studied compound, 2-cyano-3-anisyl norbornadiene (NBD5). The conjugation was extended by conversion of the nitrile into acrylonitrile and acrylate derivatives over two steps. Despite red-shifting the absorbance properties, the metastable quadricyclanes exhibited extremely short lifetimes. Meanwhile, treatment of NBD5 with acetyl halides in the presence of aluminum trihalides led to the formation of 7-acetyl norbornenes through a Wagner–Meerwein rearrangement. Subsequent transformations made it possible to synthesise norbornadienes with varying degrees of steric bulk at the 7-position of the molecular scaffold. It was found that the bulkier this group was, the more stable the quadricyclane form. This reaction sequence allows for the synthesis of norbornadiene derivatives which are more suited to molecular solar thermal applications in domestic heating despite providing a slightly lower energy density.



Strained molecules

Energy density

Wagner–Meerwein rearrangement


Martyn Jevric

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Zhihang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Anne Petersen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Mads Manso

Köpenhamns universitet

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Christopher Sumby

University of Adelaide

M. B. Nielsen

Köpenhamns universitet

Kasper Moth-Poulsen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

European Journal of Organic Chemistry

1434-193X (ISSN) 10990690 (eISSN)

Vol. 2019 13 2354-2361



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