Photoswitching chiroptical response in camphorate-based chiral metal–organic frameworks
Photoswitchable chiral materials are highly sought for various applications, including sensing, nonlinear optics, and liquid-crystalline devices. However, the origin and control of switching have not been well studied. Here, we report two chiral naphthalene diimide (NDI)-based Metal Organic Framework (MOF) materials, [Zn<sub>4</sub>(cam)<sub>4</sub>(DPNDI)<sub>2</sub>]·3DMF (Zn-MOF) (cam<sup>2-</sup> = camphorate, DPNDI = <i>N</i>,<i>N</i>'-di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide) and [Cd<sub>4</sub>(cam)<sub>4</sub>(DPNDI)<sub>4</sub>]·3EtOH·5DMF (Cd-MOF) that undergo a photoinduced reduction of the NDI cores. Delocalisation of the generated mixed-valence state in Cd-MOF stabilises the radical state and alters its response in comparison to Zn-MOF. The photoinduced reduction reveals a reversible change in the sign of the circular dichroism spectrum of Cd-MOF. These materials show promise in understanding and controlling chiroptical materials for next-generation devices.
Authors
- Deanna M. D’Alessandro (ORCID: https://orcid.org/0000-0002-1497-2543)
- Hunter J. Windsor (ORCID: https://orcid.org/0000-0002-7319-1464)
- Katelyn M. Clutterbuck (ORCID: https://orcid.org/0000-0002-5406-9914)
- Girish Lakhwani (ORCID: https://orcid.org/0000-0003-1070-5859)
Institutions
- The University of Sydney (AU)
- UNSW Sydney (AU)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5dt00814j
- Citations
- 2
- Primary Topic
- Metal-Organic Frameworks: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.07
Funders
- University of Sydney
- Australian Research Council