Defesa de Tese de Doutorado #384 – Ludmila Maria Diniz Leroy – 15/07/2021

Bistability in the form of valence tautomerism (VT), that is, the combination of mixed valence and spin crossover processes, brings about versatile compounds that combine electronic and magnetic switchers. For cobalt metallic complexes in which a redox-active ligand participates in the electron transfer, the cobalt atom alternates between the low-spin (d⁶ Co^III) and high-spin (d⁷ Co^II) states as a function of external stimuli in a reversible fashion. There has been an effort to understand, stimulate and control the VT in solid state and even to design molecules that candidate to be engineered as devices. In this work, two cobalt complexes and their VT are investigated. The controlled light-induced VT in single crystals of Co(dioxolene)₂(cyan-pyridine)₂ is demonstrated, for the first time, with an 80% interconversion yield of metastable states induced by visible light irradiation. Additionally, Co(dioxolene)₂(pyridine)₂ was investigated for three different crystal forms and in solution, benchmarking key environmental conditions that modulate the VT for such a complex. The results presented in this thesis for solid state and solutions illustrate the robustness and versatility of cobalt metal complexes as electronic labile materials.

Tópico: Defesa de Tese – Ludmila Maria Diniz Leroy
Hora: 15 jul. 2021 01:00 da tarde São Paulo

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