Licenciatura em Química (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/26
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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3 resultados
Resultados da Pesquisa
Item Uso de modelos na abordagem de geometria de sólidos cristalinos: experiência vivenciada na monitoria de Química Inorgânica L1(2021-07-12) Aciole, Rayane Cristine Gomes; Barros, Ivoneide de Carvalho Lopes; http://lattes.cnpq.br/5272867419216787; http://lattes.cnpq.br/2384434357313163The objective of this work is to study crystalline solid structures using low-cost molecular models from a sequential didactic intervention. This research was executed out during the academic monitoring period in order to improve the understanding of students about inorganic chemistry subject in the chemistry course. This work followed a pretest-posttest design on chemical bonds and solid structures, before and after the didactic intervention. The participants were 19 undergraduate students from a 4th period college chemistry course. The results obtained previously indicated that the students' understanding of chemical bonds was regular. Regarding questions about solid 90% of the students' answers were categorized as unsatisfactory. In the didactic intervention, the concrete models was built with Styrofoam balls and wooden sticks by the students. Then, non-tradicional classes and oral activities were applied. With the results of the post-test it was observed the students were able to use and visualize the built models as a tool to learn concepts of crystalline solids. At the end of the process, all students evaluated the methodology used as positive. Therefore, this study showed that the use of concrete models is an effective strategy for teaching solid structures. Finally, this research indicated that it is necessary to devote more time to teach the concept about chemical bonds within this theme and also others in Chemistry for a better understanding of this content.Item Síntese e caracterização de novos compostos de coordenação de oxidovanádio (IV) contendo ligantes podantes(2021-07-15) Silva Neto, José Paulino da; Belian, Mônica Freire; Silva, Wagner Eduardo da; http://lattes.cnpq.br/8612340815622413; http://lattes.cnpq.br/2626644337183959; http://lattes.cnpq.br/3123733088755951Since the 70’, inorganic compounds have been studied and applied as alternatives in the treatment of several diseases such as cancers, rheumatoid arthritis, and diabetes mellitus (DM). The latter is a disease that, due to its high incidence, has worrying epidemiological numbers. DM can be caused by genetic or external factors and causes serious disturbances in the metabolism of proteins, carbohydrates, and lipids, and can be classified into two subtypes. Type 1 (DM1) is caused by the non-secretion of insulin due to the autoimmune destruction of pancreatic β-cells; type 2 (DM2) occurs when cells in peripheral tissues become resistant to the chemical stimulation of the insulin. In both cases, the patients have the general picture of high blood glucose (hyperglycemia). to improve or provide alternatives to the current treatments against diabetes, compounds based on metals such as vanadium have been studied and developed, due to their already recognized antidiabetic activity. Thus, in this work, vanadium compounds were synthesized using organic ligands to providing greater absorption and fewer side effects in future applications of the compounds obtained. Furthermore, the synthesized compounds were also characterized, as well as the ligands, which underwent chemical modifications. And based on the results of spectroscopy in the infrared region, as the displacements, the lower wavenumber of the sulfone group of taurine, or the intense peak referring to the stretching of the C=O bond (1668 cm-1) in the ligand T2DO (in addition to NMR data of 1H and 13C, for this ligand) corroborate with the proposed structures and with the operation of the methodologies used. The mass spectra show strong evidence for obtaining oxovanadium complexes (IV) with the suggested structures since besides being possible to verify the peak referring to the molecular ion it is also possible to predict fragmentations in the structures of the chemical species.Item Estudo sobre a influência das ligações [pi] na luminescência de novos complexos contendo íons lantanídeos(2019-07-17) Cavalcante, Caroliny Oliveira; Belian, Mônica Freire; http://lattes.cnpq.br/2626644337183959; http://lattes.cnpq.br/2665095680217539Researches about lanthanides ions have a growing interest in consequence of its photophysic properties, through several applications, among them; lasers, contrast agents, etc. These properties elapse from energy absorption of binder and emission in visible region because of metal type as example Eu3+ complexes which emit in red region. This process of energy transfer is called Antenna Effect. The carboxilate groups bond skillfully with these trivalent cations, for being Pearson’s hard bases and usually present high absorption and energy transfer. Some energy binder-metal transfer mechanisms are known, in which its study is necessary to creation of much more luminescence complexes, thus as spectroscopic studies and knowledge about binder’s triplet states, wherein such states are obtained from Gd3+ complexes’ phosphorescence. Because of that were synthetize complexes of trans-3(3-tienil)-acrylic acid and 4(2-tienil)-butyric acid with Eu3+ and Gd3+, mixing proportions; 3:1 and 4:1. The acids, carboxilates and all complexes were characterized by Infrared Spectroscopy, and done a spectroscopic study through Eletronic Luminescense Spectroscopy. In which were noticed the symmetric and asymmetric bands of group OCO-, besides maximum of excitation and emission of each Eu3+ complex. The emissions intensity on 5D0 -7F2 hypersensible transitions from ion were higher in Eu-ATA-3:1 and Eu-ATB-4:1, with diference between state T1 of binder and state D2 of ion near 440 cm-1 e 550 cm-1, respectively.