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

Author(s)

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]}

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 398, JUL 1 2020.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 11/20606-5 - Studies of the interaction of semiconductor nanocrystals (Quantum Dots) with organic photosensitizers in the presence of nano-organized structures - models of biological systems
• Grantee: Gustavo Gimenez Parra
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/12707-0 - Cytotoxicity and photo-cytotoxicity of new ruthenium-phthalocyanines compounds as nitric oxide and oxygen singlet producers in cancer cell lines. an innovative purpose for metal based drug
• Grantee: Roberto Santana da Silva
• Support Opportunities: Regular Research Grants