Síntese e caracterização do complexo de ferro com o pesticida carbendazim, um ligante de importância ambiental.
Data
2022-12-21
Autores
Princhak, Thiago Chitiko 
Orientadores
Valle, Eliana Maira Agostini
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Pesticidas são moléculas orgânicas utilizadas no combate de pragas com objetivo de aumentar a produtividade de alimentos e plantações. Os pesticidas podem ser classificados em diferentes grupos químicos como o benzimidazol, dicarboximida, triazol e carbamatos e são classificados também quanto a sua finalidade, ou seja, qual praga será combatida. Desde 2010 o Brasil vive um crescimento do número de agrotóxicos liberados no país. O uso inadequado destas espécies tem tornado os pesticidas um poluente para o meio ambiente, sendo encontrado rotineiramente em amostras de água, solos e alimentos. No ambiente encontram-se íons metálicos disponíveis, podendo interagir com pesticidas formando complexos, apresentando propriedades diferentes das espécies isoladas. O carbendazim é um fungicida da classe dos benzimidazóis, que apresenta em sua estrutura grupos complexantes capazes de interagir com íons metálicos, formando complexos no ambiente. Entender como estas interações ocorrem, pode ajudar a compreender os efeitos destas novas espécies formadas. Neste trabalho, avaliou-se a interação entre o íon metálico ferro (II) e o fungicida carbendazim, a fim de compreender como estas interações ocorrem. Para caracterização do complexo isolado foi utilizado técnicas espectroscópicas de espectroscopia na região do ultravioleta-visível e infravermelho. Observou-se o desaparecimento da banda na faixa de 3057 cm-1, referente a vibração de alongamento do anel aromático entre as ligações C-H e deslocamento da banda para faixa de 3505 cm-1, relacionado ao grupo de aminas secundárias, evidenciando a formação do complexo. Com auxílio da técnica de espectrometria na região do UV-Vis foi observado duas bandas, em 275 nm e 300 nm, atribuído ao complexo formado. Medidas de RMN também foram realizadas e não mostraram dados significativos, devido à ausência de sinal, o que pode indicar que o ligante não tem afinidade pelo íon Fe (III).
Pesticides are organic products used to combat pests in order to increase the productivity of food and crops. Pesticides can be classified into different chemical groups such as benzimidazole, dicarboximide, triazole, and carbamates and are also based on their purpose, that is, which pest will be fought. Since 2010, Brazil has experienced an increase in the number of pesticides released in the country. The proper use of these species has made pesticides a pollutant for the environment, regularly found in water, soil and food samples. Metal ions are available in the background, which can interact with pesticides, becoming complex, with different properties from pediatric species. Carbendazim is a fungicide of the benzimidazole class, which has complex groups in its structure capable of interacting with metallic ions, forming complexes in the environment. Understanding how these species died can help to understand the effects of these new species formed. In this work, the interaction between the metallic ion iron (II) and the fungicide carbendazim is evaluated to understand how they occur. To characterize the isolated complex, spectroscopic spectroscopy techniques were used in the ultraviolet-visible and infrared regions. It is observed the disappearance of the band in the range of 3057 cm-1, referring to the vibration of elongation of the aromatic ring between the C-H bonds and displacement of the band to the range of 3505 cm-1, related to the group of secondary amines, evidencing the formation of the complex. With the aid of the spectrometry technique in the UV-Vis region, two bands were observed, at 275 nm and 300 nm, attributed to the formed complex. NMR measurements were also performed and there were no sound data, due to the absence of a signal, which may indicate that the ligand does not leak through the Fe (III) ion.
Pesticides are organic products used to combat pests in order to increase the productivity of food and crops. Pesticides can be classified into different chemical groups such as benzimidazole, dicarboximide, triazole, and carbamates and are also based on their purpose, that is, which pest will be fought. Since 2010, Brazil has experienced an increase in the number of pesticides released in the country. The proper use of these species has made pesticides a pollutant for the environment, regularly found in water, soil and food samples. Metal ions are available in the background, which can interact with pesticides, becoming complex, with different properties from pediatric species. Carbendazim is a fungicide of the benzimidazole class, which has complex groups in its structure capable of interacting with metallic ions, forming complexes in the environment. Understanding how these species died can help to understand the effects of these new species formed. In this work, the interaction between the metallic ion iron (II) and the fungicide carbendazim is evaluated to understand how they occur. To characterize the isolated complex, spectroscopic spectroscopy techniques were used in the ultraviolet-visible and infrared regions. It is observed the disappearance of the band in the range of 3057 cm-1, referring to the vibration of elongation of the aromatic ring between the C-H bonds and displacement of the band to the range of 3505 cm-1, related to the group of secondary amines, evidencing the formation of the complex. With the aid of the spectrometry technique in the UV-Vis region, two bands were observed, at 275 nm and 300 nm, attributed to the formed complex. NMR measurements were also performed and there were no sound data, due to the absence of a signal, which may indicate that the ligand does not leak through the Fe (III) ion.