Estudo, por efeito Mossbauer, dos quelatos sólidos: Tris N-Benzoil-N-Fenil-Hidroxilaminato de Fe e Tris 8-Hidroxiquinolinato de Fe

• Ano de defesa: 1971
• Autor(a) principal: Ewaldo Mello de Carvalho
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Física; Mossbauer, Efeito
• Link de acesso: http://hdl.handle.net/1843/BUOS-AHWEM7

The study of metallic chealates is justified by their wide application:tn.modern methods of chemical analysis. The preSent study , using the MoBssbauer effect , was made ont the chealates : tri-N-benzoil·N-pheni} hydroxylaminate of iron, or (BPHA) 3Fe; and tri 8-hydroxyquinolinate of iron, or (Ox) 3Fe.For both compounds there was found an asymetry of the peaks resulting from quadrupole splitting. This asymetry was explained by assuming electronic relaxation. phenomena. On the basis of this interpretation, measurements were made of ô ,Delta EQ , t1 and t 2 for both compounds. The va1ues found for (Ox) 3 F e at room temperature were: ô = (0,19+-0,01) mm/s and AEq=(0,92+-0,02) mm/s. The va1ues for (BPHA) 3Fe were : ô= (0,21+-0,02) mm/s and AEQ= (1,07+0,04) mm/s. Such parameters agreed with the va1ues expectedfor Fe 3+ in compounds of this nature: sma1l variations were observed in parameters measured at 1iquid-nitrogen temperature . The compounds were ansaled and irradiated in a reactor and by a Co60 source. No appreciable influence of radiation was observed, probab1y because of the small dosages to which the compounds were submitted.