Banca de DEFESA: ANDRE HERCULANO DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANDRE HERCULANO DE OLIVEIRA
DATA : 20/07/2018
HORA: 08:30
LOCAL: Auditório do Química 3
TÍTULO:

SYNTHESIS OF NOVEL PI-EXTENDED AZA-HETEROCYLES FOR APPLICATIONS AS ADVANCED MATERIALS

PALAVRAS-CHAVES:

benzimdiazole; quinoxaline; phenazine; advanced materials; self-assenbly; liquid crystals

PÁGINAS: 68
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Orgânica
ESPECIALIDADE: Síntese Orgânica
RESUMO:

In recent years advanced molecular materials such as OLEDs and Liquid Crystals derived from heterocyclic compounds have propelled the branch of the Organic-Electronics for their applications as organic semiconductors. In this context, this work aims to synthesize, characterize and evaluate the potential of new organic materials for applications such as semiconductors, derived from the azaheterocyclic nuclei benzimidazole, quinoxaline and phenazine, functionalized with alkyl side chains. The benzimidazole, quinoxaline and phenazine nuclei acting as building blocks were: 4- (1H-benzo [d] imidazol-2-yl) -phenol, 1,4-dihydroquinoxaline-2,3-dione, phenazine-2,3 diol. The side chain insertions in these nuclei occurred via alkylation reactions (N, N, N, N, O and O, alkylations), the dodecyl bromide was used as the source of the alkyl units. As alkylated functionalized derivatives, 1-Dodecylquinoxaline-2,3 (1H) dione, 1-4-didodecylquinoxaline-2,3 (1H, 4H) -dione, 2- (4- (dodecyloxy) phenyl) -1H-benzo [ d] imidazole, 1-dodecyl-2- (4- (dodecyloxy) phenyl) 1H-benzo [d] imidazole, and 2,3-bis (dodecyloxy) -phenazine. All derivatives were suitably characterized by IV-ATR, 1 H and 13 C nuclear magnetic resonance. As expected, after addition of the alkyl chains the novel derivatives had lower melting points than the starting compounds. Regarding the synthetic step, the methodologies used were satisfactory and with good yields. Two of the synthesized compounds were selected for investigation of their thermal behavior by polarized optical microscopy and differential scanning calorimetry. Compound 2-(4- (dodecyloxy) phenyl)-1H-benzo[d]imidazole was found to present smectic-type liquid crystalline between 85 ^oC and 172 ^oC.

MEMBROS DA BANCA:
Presidente - 1803692 - FABRICIO GAVA MENEZES
Interno - 2140775 - LIVIA NUNES CAVALCANTI
Externo à Instituição - WELMAN CURI ELIAS - UFSC