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Khayyami A, Philip A, Multia J, et al. Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD. Dalton Trans. 2020;49(32):11310-11316doi: 10.1039/d0dt02062a.
Khayyami, A., Philip, A., Multia, J., & Karppinen, M. (2020). Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD. Dalton transactions (Cambridge, England : 2003), 49(32), 11310-11316. https://doi.org/10.1039/d0dt02062a
Khayyami, Aida, et al. "Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD." Dalton transactions (Cambridge, England : 2003) vol. 49,32 (2020): 11310-11316. doi: https://doi.org/10.1039/d0dt02062a
Khayyami A, Philip A, Multia J, Karppinen M. Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD. Dalton Trans. 2020 Aug 18;49(32):11310-11316. doi: 10.1039/d0dt02062a. PMID: 32760999.
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Dalton Trans. 2020 Aug 18;49(32):11310-11316. doi: 10.1039/d0dt02062a.

Composition-tuned metal-organic thin-film structures based on photoswitchable azobenzene by ALD/MLD.

Dalton transactions (Cambridge, England : 2003)

Aida Khayyami, Anish Philip, Jenna Multia, Maarit Karppinen

Affiliations

  1. Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland. [email protected].

PMID: 32760999 DOI: 10.1039/d0dt02062a

Abstract

We demonstrate the fabrication of in-situ crystalline thin films of various azobenzene (AZO) based metal-organic structures using the atomic/molecular layer deposition (ALD/MLD) technique; these are highly intriguing materials as azobenzene is one of the prototype organic molecules experiencing photoisomerization. Our Li-, Ca and Fe-AZO thin films deposited from Li(thd) (thd = 2,2,6,6-tetramethyl-3,5-heptanedione), Ca(thd)2, FeCl3 and azobenzene-4,4'-dicarboxylic acid precursors in the temperature range of 250-360 °C exhibit metal-AZO structures not known from bulk samples. In all these structures, the AZO linker molecules are free to undergo the characteristic trans-cis photoisomerization reaction upon UV (360 nm) irradiation. However, this lowers the degree of crystallinity. To address the issue, we investigate hetero-organic structures where TPA (terephthalic acid) is used as another linker component together with AZO. This allows the trans-cis reaction of the AZO moieties to occur without compromising the film crystallinity. Finally, we demonstrate the growth of MOF-on-MOF type Ca-ADA@Ca-TPA thin films also showing the efficient photoisomerization reaction.

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