New organic photosensitizers based on triphenylamine and hydantoin as anchoring group onto TiO2 Surface

Autor(es)

Caicedo-Reina, Mauricio ^[1] ; Guimaraes, Robson R. ^[2] ; Ortiz, Alejandro ^{[1, 3]} ; Araki, Koiti ^[2] ; Insuasty, Braulio ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Valle, Dept Chem, Heterocycl Cpds Res Grp, Cali 25360 - Colombia

^[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Lab Supramol Chem & Nanotechnol, Av Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[3] Ctr Bioinformat & Photon CIBioFI, Calle 13 100-00, Edificio E-20, 1069, Cali 25360 - Colombia

• Tipo de documento: Artigo Científico
• Fonte: Journal of Molecular Structure; v. 1251, MAR 5 2022.
• Citações Web of Science: 0

Resumo

In this work, we present the synthesis of novel D-pi-A compounds based on the structure of 2-(3-hexyl-2-oxoimidazolin-4-ylidene) malononitrile, which can function as an acceptor group and anchoring group to the TiO2 surface. The synthetic route of the dyes involving a Knoevenagel condensation under microwave irradiation with donors based on triphenylamine (TPA) and thiophene moiety as a conjugated wire. Additionally, absorption, emission and electrochemical experiments were carried out to demonstrate a push-pull behavior in all the dyes. Finally, DCH 1-6 dyes were tested as photosensitizers in Gratzel type solar cells showing a low PCE values (between 0.10% and 0.60%), due to the poor electron injection on TiO2 surface for the low LUMO energy levels of the prepared dyes. (C) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/24725-4 - Química supramolecular e nanotecnologia
• Beneficiário: Henrique Eisi Toma
• Modalidade de apoio: Auxílio à Pesquisa - Temático