Speaker
Description
Multifunctional molecular materials based on coordination polynuclear multi-site molecules lie at the heart of materials science in view of growing technological challenges dedicated to the progressive miniaturization process and required high operation speed in information processing, quantum computing, and spintronics. Invariably particular interest in research is focused on molecular materials combining several desirable physicochemical properties to conform switchability regime, and thus, to constituting the physical basis for recording, reading, and processing information. We have focused in our work on modular approach, which originally is based on combination of different metal ions or larger molecular fragments in molecular architecture. This is an acknowledged way to gain a variety of unique structural motives and material properties involving e.g. electronic conduction, charge transfer, spin crossover, noncentrosymmetry, luminescence, second-harmonic generation [1]. In this context, one of the perfect candidates for our consideration are molecular compounds with two or more inequivalent spin states, which could be switched by convenient external stimulus such as temperature, light, electric current, sorption/desorption or chemical activation.
The presentation will focus on the design strategies, synthesis and physicochemical properties of two families of large molecular clusters with switchable magnetic properties. In particular architectures of {M$_9$[M$^{\prime}$(CN)$_8$]$_6$(MeOH)$_{24}$}$\cdot$solv (M = Co$^{2+}$, Ni$^{2+}$, Fe$^{2+}$, Mn$^{2+}$, M$^{\prime}$ = W$^{\rm V}$, Re$^{\rm V}$) and {Fe[Fe(bzbpen)]$_6$[W$^{\rm V}$(CN)$_8$]$_2$[W$^{\rm IV}$(CN)$_8$]$_2$}$\cdot$solv clusters representing switchable magnetic properties realized via spin crossover (SCO) or electron transfer (ET) phenomena stimulated by temperature or sorption/desorption of solvents [2,3]. Moreover, the presentation will explore further concepts of reversible spin state switching implementation via light-driven cyclization or isomerization of photochromic organic ligands from the diarylethenes and azobenzenes group.
Acknowledgements
We gratefully acknowledge National Science Centre (Poland) project number 2019/35/B/ST5/01481
References
[1] J. Kobylarczyk et al., “Modular approach towards functional multimetallic coordination clusters,” Coordination Chemistry Reviews, vol. 419. Elsevier BV, p. 213394, Sep. 2020. https://doi.org/10.1016/j.ccr.2020.213394
[2] L. Shi et al., “Site Selectivity for the Spin States and Spin Crossover in Undecanuclear Heterometallic Cyanido-Bridged Clusters,” Inorganic Chemistry, vol. 62, no. 18. American Chemical Society (ACS), pp. 7032–7044, Apr. 25, 2023. https://doi.org/10.1021/acs.inorgchem.3c00325
[3] J. Kobylarczyk et al., “Tuning of the phase transition between site selective SCO and intermetallic ET in trimetallic magnetic cyanido-bridged clusters,” Dalton Transactions, vol. 49, no. 47. Royal Society of Chemistry (RSC), pp. 17321–17330, 2020. https://doi.org/10.1039/d0dt03340e
