Colóquios da Nano | Biochemistry Applied to Materials Science: The Role of Chiral Molecules – Profa. Dra Iseli L. N. Cardoso

  • Responsável: Pós-graduação em Nanociências e Materiais Avançados
  • Câmpus: Evento Virtual
  • Local: Online: https://nano.ufabc.edu.br/coloquios-e-seminarios-do-ppg-nma/
  • Data: 22/04/2021
  • Horário: 16:00 às 17:30
  • Descrição:

    A molecular structure is said chiral when its mirror image does not overlap the original structure, and these structures are non-superimposable, just like our left and right hands. In 1848 Pasteur observed that crystallization of tartaric produced two different crystals with non‐superimposable mirror‐images and constituted by isomers that in solution exhibited optical rotations of equal magnitude but opposite in directions. From that time on, many advances occurred, but the studies and applications of chiral molecules were restricted to the fields of Chemistry and Biochemistry for a long time. Recently, chiral molecules have gained enormous importance for materials science due to the discovery of the Chiral Induced Spin Selectivity (CISS) effect. The CISS effect could relate the spin orientation to the molecular frame and superstructures such as the protein alpha-helix secondary structure. After charge polarization, chiral molecules and moieties have a preferred orientation of the electron spin in the molecular structure. Thus, the CISS effect allows the manipulation of chemical reactions and, more recently, has been used for enantiomer separations and biorecognition processes. The CISS effect results that electron transport is spin-selective through chiral molecules and can be applied to develop spintronic devices. Materials with spin selectivity have been obtained through the association with chiral molecules, the growing of crystal with chiral distortion induced by the template of biomolecules, and chiral molecules in the crystal structure as recently described perovskites. In our group, these strategies are being applied by the association of cytochrome c with hierarchically structured nanowires of iron oxides, production of optically active Co3O4 templated by ferritin and histidine, and the modification of perovskite by D and L-histidine.

  • Necessita inscrição: Não
  • Link de divulgação: https://nano.ufabc.edu.br/coloquios-e-seminarios-do-ppg-nma/

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