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You searched for +publisher:"Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas" +contributor:("Rezende, Michele Jakeline Cunha"). One record found.

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1. PEREIRA, Danilo Sousa. <em class="hilite"><em class="hilite">Sem>em>?ntese e avalia??<em class="hilite">oem> da atividade anticorrosiva <em class="hilite"><em class="hilite">deem>em> tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas.

Degree: 2014, Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas

Submitted by Jorge Silva ([email protected]) on 2019-12-27T17:03:29Z No. of bitstreams: 1 2014 - Danilo Sousa Pereira.pdf: 4194633 bytes, checksum: 42ac8e3592b6c39b6fceba67d42e2c5c (MD5)

Made available in DSpace on 2019-12-27T17:03:29Z (GMT). No. of bitstreams: 1 2014 - Danilo Sousa Pereira.pdf: 4194633 bytes, checksum: 42ac8e3592b6c39b6fceba67d42e2c5c (MD5) Previous issue date: 2014-02-25

Six (6) thiosemicarbazides and five (5) 1,3,4-thiadiazolium-2-phenylamine hydrochloride were synthesized for this dissertation; two (2) of them are being reported for the first time. Thiosemicarbazides were synthesized via three (3) different methodologies: stirring with temperature variation (Method A), microwave irradiation (Method B), and solid-solid reaction (Method C). Mesoionic salts were also synthesized by different methods; firstly, under reflux in the presence of 1,4-dioxane as solvent, from cinnamic acid chlorides and N1,N4-substituted thiosemicarbazides (Method A). And secondly, using microwave irradiation in the presence of thionyl chloride, from cinnamic aldehyde and N1,N4-substituted thiosemicarbazides (Method B). The compounds were obtained in high purity and satisfactory yields: between 65% and 92% for thiosemicarbazides, and between 54% and 99% for mesoionic salts. All compounds were characterized by spectroscopic techniques. In order to obtain information on the structural and electronic properties that could contribute to the prediction of corrosion inhibition efficiency, the structures of the synthesized compounds were investigated using SPARTAN-PRO program in semi-empirical method. Mesoionic salts showed the lowest values forthe difference between energy levels of the frontier orbitals (HOMO and LUMO), which indicates that these compounds could be more effective in inhibiting corrosion than di-ortho-tolylthiourea. All synthesized compounds were experimentally evaluated against the corrosion of AISI 1020 carbon steel in HCl 1 M. The results generally showed significant percentages of corrosion inhibition; specially, for the mesoionic salt that contains the methoxy group in the cinnamic portion of the molecule, which reached levels of 77% and 94% in the technical Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization, respectively. In general, the methodologies used for experimental evaluation of corrosion activity and the technique of molecular modeling gave correlated results.

Neste trabalho de pesquisa foram sintetizadas seis (6) tiossemicarbazidas e cinco (5) cloridratos mesoi?nicos pertencentes ? classe 1,3,4-tiadiazolio-2-fenilaminidas, dos quais dois (2) est?o sendo relatados pela primeira vez. As tiossemicarbazidas foram sintetizadas via tr?s (3) metodologias diferentes: agita??o com escala de temperatura (Metodologia A); irradia??o de micro-ondas (Metodologia B); e rea??o s?lido-l?quido (Metodologia C). Os sais mesoi?nicos tamb?m foram sintetizados via metodologias diferentes, sendo a primeira em refluxo na presen?a de 1,4-dioxano como solvente, a partir dos cloretos…

Advisors/Committee Members: Lima, Aurea Echevarria Aznar Neves, Lima, Aurea Echevarria Aznar Neves, Rezende, Michele Jakeline Cunha, Bauerfeldt, Glauco Favilla.

Subjects/Keywords: inibidores org?nicos de corros?o; tiossemicarbazidas; cloridratos mesoi?nicos; Modelagem molecular; Polariza??o potenciodin?mica; Espectroscopia de Imped?ncia Eletroqu?mica; Qu?mica

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APA (6th Edition):

PEREIRA, D. S. (2014). S?ntese e avalia??o da atividade anticorrosiva de tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas. (Masters Thesis). Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas. Retrieved from https://tede.ufrrj.br/jspui/handle/jspui/3203

Chicago Manual of Style (16th Edition):

PEREIRA, Danilo Sousa. “S?ntese e avalia??o da atividade anticorrosiva de tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas.” 2014. Masters Thesis, Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas. Accessed May 07, 2021. https://tede.ufrrj.br/jspui/handle/jspui/3203.

MLA Handbook (7th Edition):

PEREIRA, Danilo Sousa. “S?ntese e avalia??o da atividade anticorrosiva de tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas.” 2014. Web. 07 May 2021.

Vancouver:

PEREIRA DS. S?ntese e avalia??o da atividade anticorrosiva de tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas. [Internet] [Masters thesis]. Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas; 2014. [cited 2021 May 07]. Available from: https://tede.ufrrj.br/jspui/handle/jspui/3203.

Council of Science Editors:

PEREIRA DS. S?ntese e avalia??o da atividade anticorrosiva de tiossemicarbazidas e sais mesoi?nicos da classe 1,3,4-tiadiaz?lio-2-aminidas. [Masters Thesis]. Universidade Federal Rural do Rio de Janeiro; Programa de P?s-Gradua??o em Qu?mica; UFRRJ; Brasil; Instituto de Ci?ncias Exatas; 2014. Available from: https://tede.ufrrj.br/jspui/handle/jspui/3203

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