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Previous issue date: 2015-01-13 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O objetivo estabelecido para este trabalho foi sintetizar e caracterizar novos
complexos de ferro e de cobre com a base de Schiff 3-MeOsalen e ligantes de relev?ncia
biol?gica, cujas f?rmulas s?o [Fe(3-MeOsalen)NO2], [Fe(3-MeOsalen)(etil2-dtc)],
[Fe(3-MeOsalen)NO] e Na[Cu(3-MeOsalen)NO2]. Os compostos foram caracterizados
atrav?s da espectroscopia vibracional na regi?o do infravermelho (IV) e da espectroscopia
eletr?nica na regi?o do ultravioleta e vis?vel (Uv-Vis). A partir das an?lises dos espectros de
infravermelho, comprovou-se a forma??o dos complexos precursores, evidenciada pelas
altera??es nas frequ?ncias de vibra??o ?(C=N) e ?(C-O) e pelo surgimento de modos
vibracionais metal-oxig?nio e metal-nitrog?nio. Para os nitro complexos de ferro e cobre
observaram-se ?(NO2)ass em torno de 1300 cm-1
e ?(NO2)sim em 1271 cm-1
, indicando que a
coordena??o se faz via ?tomo de nitrog?nio. O espectro do complexo
[Fe(3-MeOsalen)(etil2-dtc)] exibiu duas bandas, o ?(C-NR2) em 1508 cm-1
e ?(C-S) em
997 cm-1
, pertinentes a modos vibracionais de coordena??o do ligante na forma bidentada.
Para o complexo [Fe(3-MeOsalen)NO] foi observado uma nova banda intensa em 1670 cm-1
referente ao ?(NO). Com os espectros eletr?nicos, a forma??o dos complexos foi evidenciada
pelos deslocamentos das bandas de transi??es intraligantes e pelo surgimento de novas
bandas, como a LMCT (p? Cl- ? d?* Fe3+) no [Fe(3-MeOsalen)Cl] e a d-d no
[Cu(3-MeOsalen)H2O]. J? para o [Fe(3-MeOsalen)NO2], destacou-se a aus?ncia da banda
LMCT presente no complexo precursor enquanto para o Na[Cu(3-MeOsalen)NO2]
constatou-se o deslocamento hipsocr?mico da banda d-d em 28 nm. O espectro eletr?nico do
[Fe(3-MeOsalen)(etil2-dtc)] apresentou deslocamentos da banda LMCT e altera??es nas
transi??es intraligantes. No que se refere ao [Fe(3-MeOsalen)NO], evidenciou-se transi??es
intraligantes em regi?es mais energ?ticas, proveniente do forte car?ter ? receptor do NO e
uma banda MLCT, da transi??o d?Fe(II)??*(NO). / The goal set for this work was to synthesize and to characterize new iron and copper
complexes with the Schiff base 3-MeOsalen and ligands of biological relevance, whose
formulas are [Fe(3-MeOsalen)NO2], [Fe(3-MeOsalen)(etil2-dtc)], [Fe(3-MeOsalen)NO] and
Na[Cu(3-MeOsalen)NO2]. The compounds were characterized by vibrational spectroscopy
in the infrared region (IV) and Electronic spectroscopy in the ultraviolet and visible
region (Uv-Vis). From the analysis of infrared spectra, they proved to formation of precursor
complexes, as evidenced by changes in the vibrationals frequencies ?(C=N) e ?(C-O) and the
emergence of vibrationals modes metal-oxygen and metal-nitrogen. For nitro complexes of
iron and copper were observed ?(NO2)ass around 1300 cm-1
e ?(NO2)sim in 1271 cm-1
,
indicating that the coordination is done via the nitrogen atom. The complex spectrum
[Fe(3-MeOsalen)(etil2-dtc)] exhibited two bands, the ?(C-NR2) in 1508 cm-1
e ?(C-S) in
997 cm-1
, the relevant vibrational modes of coordinating ligand in the bidentate form. For the
complex [Fe(3-MeOsalen)NO] was observed a new intense band in 1670 cm-1
related to the
?(NO). With the electronic spectra, the formation of complexes was evidenced by shifts of
bands intraligands transitions and the emergence of new bands such as LMCT
(p? Cl- ? d?* Fe3+) in [Fe(3-MeOsalen)Cl] and the d-d in [Cu(3-MeOsalen)H2O]. As for the
[Fe(3-MeOsalen)NO2] has highlighted the absence of LMCT band present in the precursor
complex as for the [Cu(3-MeOsalen)NO2] found that the displacement of the band
hipsocr?mico d-d on 28 nm. The electronic spectrum of [Fe(3-MeOsalen)(etil2-dtc)] presented
LMCT band shifts and changes in intraligantes transitions. With regard to
[Fe(3-MeOsalen)NO], revealed a more energetic transitions intraligands regions from the
strong character ? receiver NO and MLCT band of transition d?Fe(II)??*(NO).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19772 |
| Date | 13 January 2015 |
| Creators | Paiva, Anallicy Santos de |
| Contributors | 42396441353, Silva, Ana L?cia Rodrigues da, 51101173300, http://lattes.cnpq.br/3799043971887247, Oliveira, ?tom Anselmo de, 03936872449, http://lattes.cnpq.br/7903084274135177, Pontes, Daniel de Lima, Pontes, Ana Cristina Facundo de Brito |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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