Adsorption of Aromatic Molecules in a Microporous Spin Crossover Material, Fe(pyrazine)[Fe(CN)5NO]. Tuning of Its Physical Properties

• Published in: Journal of physical chemistry. C Vol. 127; no. 44; pp. 21777 - 21787
• Main Authors: Scanda, Karla, Avila, Yosuan, Sánchez, Laritza, Mojica, Rodrigo, Portales-Martínez, Benjamín, González, Marlene, Ávila, Manuel, Reguera, Edilso
• Format: Journal Article
• Language: English
• Published: American Chemical Society 09.11.2023
• Subjects: C: Physical Properties of Materials and Interfaces
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.3c05240

In microporous materials, the guest species interacts with the host framework and can modify the electronic structure of that last one and the related physical and functional properties. For instance, this possibility is relevant regarding their potential applications in sensor and actuator device construction. In this contribution, we are reporting the effect of tiny aromatic molecules (benzene, toluene, furan, and thiophene) adsorption in Fe­(pyrazine)­[Fe­(CN)5NO]. This material has a porous framework appropriate for the adsorption of small molecules, and at the same time, it shows spin crossover properties. TG mass spectrometry and IR spectroscopy followed the presence of these molecules as adsorbed species in the host framework. The results from XRD structural studies, IR and Mössbauer spectra, and magnetic (SQUID) measurements illustrate the modification of the spin crossover properties of that solid through the adsorption process of these tiny molecules. The recorded experimental data shed light on the framework adsorption sites for these guest molecules and the nature of the guest–host interactions. The effects of the guest molecule on the spin crossover properties of the microporous solid under study are particularly pronounced.