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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A Silsesquioxane Organically Modified with 4-Amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol: Thermal Behavior and Its Electrochemical Detection of Sulfhydryl Compounds

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Do Carmo, D. R. [1] ; Silvestrini, D. R. [1] ; Barud, H. S. [2] ; Filho, N. L. Dias [1] ; Bicalho, U. O. [1] ; Soares, L. A. [1]
Total Authors: 6
[1] Univ Estadual Paulista UNESP, Fac Engn Ilha Solteira, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil
[2] Univ Estadual Paulista UNESP, Inst Quim Araraquara, Dept Fis Quim, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Nanomaterials; 2014.
Web of Science Citations: 5

The octakis(3-chloropropyl)silsesquioxane (SS) was organofunctionalized with 4-amino-5- 4(pyridyl)-4H-1,2,4-triazole-3-thiol. The product formed (SA) was undergo another reactions in two steps, first with copper and so hexacyanoferrate (III) to form CuHSA. The organofunctionalized silsesquioxane was characterized by the following techniques: scanning electron microscopy (SEM), Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) in solid state, and thermogravimetric analysis in air and nitrogen atmosphere. The composite CuHSA was incorporated into a graphite paste electrode and the electrochemical behavior studies were conducted with cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with CuHSA showed one redox couple with formal potential E-theta' = 0.75V versus Ag/AgCl(sat) (KCl 1.0 mol L-1; v = 20 mV s(-1)) attributed to the redox process Fe-(II) (CN)(6)/Fe-(III)(CN)(6) of the binuclear complex formed. The redox couple presents an electrocatalytic response of sulfhydryl compounds such as n-acetylcysteine and l-cysteine. For determination of n-acetylcysteine and l-cysteine the modified graphite paste electrode showed a linear region in the concentration range of 2 to 20 m mol L-1. The modified electrode was chemically and electrochemically stable and showed good reproducibility. (AU)

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 type: Scholarships in Brazil - Doctorate
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 type: Regular Research Grants