Interaction of CdTe-MPA quantum dots with meso-tetra methyl pyridyl porphyrin. Charge transfer complex formation

Autor(es)

Parra, Gustavo G. ^[1] ; Pavanelli, Andre L. S. ^{[1, 2]} ; Franco, Lilian P. ^[3] ; Maximo, Leandro N. C. ^[4] ; da Silva, Roberto S. ^[5] ; Borissevitch, Iouri ^{[6, 1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Fis, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Borissevitch, Iouri, Univ Fed Goias, Inst Fis, Goiania, Go, Brazil.Parra, Gustavo G., Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Fis, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

^[3] Ctr Univ Itajuba, FEPI, Av Dr Antonio Braga Filho 687, Itajuba, MG - Brazil

^[4] Inst Fed Educ Ciencia & Tecnol Goiano, BR-75790000 Urutai, Go - Brazil

^[5] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Fis & Quim, Av Bandeirantes 3900, Ribeirao Preto, SP - Brazil

^[6] Univ Fed Goias, Inst Fis, Goiania, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 398, JUL 1 2020.
• Citações Web of Science: 0

Resumo

The unique characteristics of quantum dots (QD), such as an intensive and narrow luminescence spectrum, broad and intense absorption spectrum and high chemical and photostability, make them promising for applications in various fields, including in medicine as probes in the cancer luminescence diagnostics. The effective light absorption by QD in a wide spectral region allows their use as an antenna to accumulate light energy and transfer this energy to other photoactive compounds (photosensitizers, PS). A charge transfer complex between QD and PS can be formed as well. This can change spectral and energetic characteristics of the complex components, thus affecting their efficiency in applications. In this work we demonstrate the formation of a charge transfer complex between CdTe QD functionalized by 3-Mercaptopropionic Acid (3-MPA) and meso-tetra methyl pyridyl porphyrin (TMPyP) in water solutions and present its excited state spectral and temporal characteristics. The complexation constant was K-b = 5.5 +/- 0.5 M-1. On the base of the QD luminescence quenching at complexation we propose the network structure of the TMPyP-QD complex. (AU)

• Processo FAPESP: 11/20606-5 - Estudos da interação dos nanocristais semicondutores (Pontos Quânticos) com fotossensibilizadores orgânicos na presença de estruturas nanoorganizadas - modelos de sistemas biológicos
• Beneficiário: Gustavo Gimenez Parra
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/12707-0 - Citotoxicidade e foto-citotoxicidade de compostos rutênio-ftalocianinas como produtores de óxido nítrico e oxigênio singleto em linhagens de células cancerígenas. Proposta para uma nova classe de metalo-drogas
• Beneficiário: Roberto Santana da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular