Spin Crossover Metal-Organic Frameworks with Inserted Photoactive Guests: On the Quest to Control the Spin State by Photoisomerization

Barbora Brachňaková (1, 2) , Ján Moncoľ (2) , Ján Pavlik (2) , Ivan Šalitroš (2, 3, 4) , Sébastien Bonhommeau (5) , Francisco Javier Valverde-Muñoz (6) , L. Salmon (1) , Gábor Molnár (1) , Lucie Routaboul (1) , Azzedine Bousseksou (1)

1 LCC - Laboratoire de chimie de coordination
2 STU - Slovak University of Technology in Bratislava
3 Faculty of Science [Univ Palacký]
4 CEITEC MU - Central European Institute of Technology [Brno]
5 ISM - Institut des Sciences Moléculaires
6 ICMol - Instituto de Ciencia Molecular

Three Hofmann-like metal-organic frameworks {Fe(bpac)[Pt(CN)4]}•G (bpac=1,2-bis(4-pyridyl)acetylene) were synthesized with photoisomerizable guest molecules (G = trans-azobenzene, trans-stilbene or cis-stilbene) and were characterized by elemental analysis, thermogravimetry and powder X-ray diffraction. The insertion of guest molecules and their conformation were inferred from Raman and FTIR spectra and from single-crystal X-ray diffraction and confronted with computational simulation. The magnetic and photomagnetic behaviors of the framework are significantly altered by the different guest molecules and different conformations. On the other hand, photoisomerization of the guest molecules becomes strongly hindered by the framework.

Domaines: Chimie de coordination; Cristallographie

Barbora Brachňaková, Ján Moncoľ, Ján Pavlik, Ivan Šalitroš, Sébastien Bonhommeau, et al.. Spin Crossover Metal-Organic Frameworks with Inserted Photoactive Guests: On the Quest to Control the Spin State by Photoisomerization. Dalton Transactions, 2021, 50 (25), pp.8877-8888. ⟨10.1039/D1DT01057C⟩. ⟨hal-03285860⟩