Banca de DEFESA: LUIS VINICIUS GONÇALVES DE MELO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUIS VINICIUS GONÇALVES DE MELO
DATE: 01/09/2023
TIME: 09:00
LOCAL: PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA DE MATERIAIS
TITLE:

Synthesis of Sulfonatobisperilenimides as Chromonic Mesogens for the Preparation of Lyotropic Liquid Crystals as Alignment Medium in NMR

KEY WORDS:

Chromonic phases, Lyotropic liquid crystals, Bisperilenimides, NMR.

PAGES: 73
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Lyotropic liquid crystals have been used, among other applications, as alignment media in Nuclear Magnetic Resonance spectroscopy (NMR) experiments to generate anisotropy in the sample. In this way, the anisotropic NMR observables, such as dipolar coupling, quadrupolar coupling and chemical shift anisotropy, can be partially recovered, providing new geometric information about the molecular structure. In this work, three bisperilenimides were synthesized with peripheral solubilizing agents, containing sulfonates, to form chromonic phases soluble in aqueous medium. The synthesis of these compounds was carried out from the conjugation of perylenetetracarboxylic dianhydride with: aminoethanesulfonic acid, sulphanilic acid and aminomethanesulfonic acid, forming di(ethanesulfonic) perylene-3,4,9,10- bis(dicarboximide) disodium (BPI-ES), di(p-benzenesulfonic) perylene-3,4,9,10-bis(dicarboximide) diimidazole (BPI- pBS) and di(methanesulfonic) perylene-3,4,9,10-bis(dicarboximide) disodium (BPIMS), respectively. The reaction yields were 74 % for BPI-ES, 86% for BPI-p-BS and 73 % for BPI-MS. The compounds were characterized by NMR, Infrared and Ultraviolet-visible spectroscopy. The formation of the mesophase was evaluated by splitting the 2 H NMR signal at different concentrations at 25o C and 50o C, as well as analysing the textures of Polarized Light Microscopy images obtained in this work. The studied conditions of temperature and concentrations studied, it was observed the formation of the mesophase in the BPI-ES system at 0.2 M aqueous solution, indicating that this mesogen could be used as an alignment medium for anisotropic NMR measurements.

COMMITTEE MEMBERS:
Presidente - 2215007 - FERNANDO HALLWASS
Externa à Instituição - JULIANA ECCHER - UFSC
Externo ao Programa - 2199064 - RICARDO OLIVEIRA DA SILVA - null