Reactivity of a Silsesquioxane Organofunctionalized with 4-Amino-5-Phenyl-4H-[1,2,4]-Triazole-3-thiol: Complementary Characterization and an Application to Chronoamperometric Detection of L-Dopamine

Author(s)

Fernandes, Daniela Silvestrini ^[1] ; Maraldi, Vitor Alexandre ^[1] ; Dias Filho, Newton Luiz ^[2] ; do Carmo, Devaney R. ^[1]

Affiliation

^[1] Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Quim & Fis, Ave Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Engn Mecan, Ave Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

• Document type: Journal article
• Source: SILICON; v. 11, n. 2, p. 1131-1142, APR 2019.
• Web of Science Citations: 0

Abstract

This work describes the organofunctionalization and a complementary characterization and application of an octakis(3-chloropropyl)octasilsesquioxane (1) with 4-Amino-5-Phenyl-4H-{[}1,2,4]-Triazole-3-Thiol (2). The functionalized silsesquioxane (3) was characterized by nuclear magnetic resonance, X-ray diffraction, transmission electron microscopy and thermogravimetric analysis. After functionalized, the silsesquioxane can interact with copper chloride and subsequently with potassium hexacyanoferrate (III) (4). The hybrid composite formed (4) was characterized by FT-IR and diffuse reflectance. The compound 4 included into a work graphite paste electrode (20% w/w) was examined for chronoamperometric determination of L-Dopamine. The modified graphite paste electrode with compound 4 showed a linear response from 2.5 x 10(-5) at 4.0 x 10(-4) mol L-1. The modified graphite paste electrode with 4 showed a detection limit of 2.08 x 10(-4) mol L-1 with a relative standard deviation of +/- 2% (n = 3) and amperometric sensitivity of 0.136 A mol L-1. (AU)

• FAPESP's process: 12/05438-1 - Development of novel nanostructured organically functionalized hybrid silsesquioxanes: preparation, characterization and its application as a sensor of compounds and ions of environmental and biological interest
• Grantee: Devaney Ribeiro Do Carmo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/11306-0 - Electrochemical quantification of analytes of environmental and biological interest, using new materials prepared from functionalized silsesquioxanes.
• Grantee: Daniela Silvestrini Fernandes
• Support Opportunities: Scholarships in Brazil - Doctorate