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Master's Dissertation
DOI
https://doi.org/10.11606/D.59.2007.tde-22092007-212016
Document
Author
Full name
Emmanuel Zimmermann Moreira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2007
Supervisor
Committee
Iamamoto, Yassuko (President)
Ferreira, Ana Maria da Costa
Oliveira, Herenilton Paulino
Title in Portuguese
Síntese e caracterização de pentafluorofenil-piridil-porfirinas substituídas com complexos de rutênio
Keywords in Portuguese
complexo de rutênio
luminescência
porfirina
Abstract in Portuguese
Esta dissertação apresenta a síntese, a caracterização de pentafluorofenil-piridilporfirinas base livre e substituídas com complexos de rutênio. Foi feita a investigação de como a inserção de grupos pentafluorofenil (grupos retiradores de elétrons) interfere nas das propriedades eletroquímicas, espectroscópicas e fotofísicas das porfirinas. A partir da coordenação do complexo [Ru(bpy)2Cl]+ e do cluster trinuclear de rutênio [Ru3O(Ac)6(py)2]+ à porfirina M(4-N-Py)TFPPH2 foram construídas as díades modelo [M(4-N-Py)TFFPH2{Ru3O(Ac)6(py)2}]PF6 e [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}] PF6, que foram caracterizadas pelas mesmas técnicas que as porfirinas. Também foram sintetizadas as tríades assimétricas cis- e trans-[B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2} {Ru(bpy)2Cl}](PF6)2, onde há a coordenação do complexo [Ru(bpy)2Cl]+ e do cluster trinuclear de rutênio [Ru3O(Ac)6(py)2]+ aos isômeros das porfirinas cis- e trans-B(4-N-Py)BFFPH2. Estas moléculas foram caracterizadas por análise de massa ESI MS e ESI MSMS e por espectroscopia UV-Vísivel. Pelos espectros UV-Vísivel pode-se notar que os espectros são apenas uma somatória do perfil espectral dos componentes, sugerindo ausên-cia de comunicação eletrônica. No entanto estudos eletroquímicos das díades [M(4-N-Py)TFFPH2{Ru3O(Ac)6(py)2}]PF6 e [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}]PF6 indicam que esta comunicação existe, embora pequena, não é negligenciável. Os estudos por análise de massa ESI MS e ESI MSMS foram realizados com as porfirinas, com o complexos [Ru(bpy)2Cl]+, com o cluster trinuclear de rutênio [Ru3O(Ac)6(py)2]+, com as díades modelos [M(4-N-Py)TFFPH2 {Ru3O(Ac)6(py)2}]PF6 e [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}]PF6 e com as tríades assimétricas cis- e trans-[B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2}{Ru(bpy)2Cl}](PF6)2. As estruturas dos compostos foram confirmados por ESI MS. Para as tríades cis- e trans-[B(4-N-Py)BFFPH2 {Ru3O(Ac)6(py)2}{Ru(bpy)2Cl}](PF6)2 os experimentos ESI MSMS permitiram verificar que a fragmentação dos compostos, levam às unidades monossubstituidas [B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2}]+ e [B(4-N-Py)BPFPH2{Ru(bpy)2Cl}]+ e os fragmentos substituintes [Ru(bpy)2Cl]+ e [Ru3O(Ac)6(py)2]+. Não foi possível verificar nenhuma diferença na fragmentação dos isômeros cis- e trans- das supermoléculas. Os ensaios de luminescência mostraram que a introdução de grupos modificadores [Ru(bpy)2Cl]+ e [Ru3O(Ac)6(py)2]+ suprimem a emissão da porfirina. Os dados fotofísicos preliminares mostram que as duas unidades ligadas às porfirinas M(4-N-Py)TFPPH2, cis- e trans- B(4-N-Py)BFPPH2 estão atuando como aceptor final de carga.
Title in English
Synthesis and characterization of pentafluorophenil-pyridil-porphyrins substituted with ruthenium complex.
Keywords in English
luminescence
porphyrin
ruthenium complex
Abstract in English
This work reports the synthesis and characterization of free base pentafluorophenylpyridilporphyrins as well as the synthesis and characterization of these compounds coordinated with ruthenium complexes. We have investigated how the insertion of pentafluorophenyl groups (electronwithdrawing groups) interferes with the eletrochemical, spectroscopic and photophysical properties of the compounds. The dyads models [M(4-N-Py)TFFPH2{Ru3O(Ac)6(py)2}]PF6 and [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}] PF6 were constructed using the [Ru(bpy)2Cl]+ complex, the trinuclear ruthenium cluster [Ru3O(Ac)6(py)2]+, and the free base porphyrin M(4-N-Py)TFPPH2. These dyads were characterized by the same techniques used to characterize the isolated porphyrins. The assimetric triads cis- and trans-[B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2} {Ru(bpy)2Cl}](PF6)2 were also synthesized, through coordination of the [Ru(bpy)2Cl]+ complex with the [Ru3O(Ac)6(py)2]+ trinuclear ruthenium complex and the cis- and trans isomers of the B(4-N-Py)BFFPH2 porphyrin. These molecules were characterized by ESI MS and ESI MSMS mass analyses and UV-Visible spectroscopy. The UV-Visible spectra were a sum of the spectral profile of the isolated components, suggesting a lack of eletronic communication between the units. However, electrochemical studies of the [M(4-N-Py)TFFPH2{Ru3O(Ac)6(py)2}]PF6 and [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}]PF6 dyads denoted this communication exists. So, despite being low, it must not be disregarded. ESI MS and ESI MSMS mass analyses of the porphyrins, the complex [Ru(bpy)2Cl]+, the trinuclear ruthenium cluster [Ru3O(Ac)6(py)2]+, the dyads model [M(4-N-Py)TFFPH2 {Ru3O(Ac)6(py)2}]PF6, and [M(4-N-Py)TFFPH2{Ru(bpy)2Cl}]PF6 and the assimetric triads cis- and trans-[B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2}{Ru(bpy)2Cl}](PF6)2 were carried out. The structures of the compounds were confirmed by ESI MS. The ESI MSMS experiments for the cis- and trans-[B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2} {Ru(bpy)2Cl}](PF6)2 triads allow us to verify that the fragmentation of the compounds results in the monosubstituted units [B(4-N-Py)BFFPH2{Ru3O(Ac)6(py)2}]+ and [B(4-N-Py)BPFPH2{Ru(bpy)2Cl}]+, and the substituents units [Ru(bpy)2Cl]+ and [Ru3O(Ac)6(py)2]+. No difference in the fragmentation of the cis- and trans-isomers of the supermolecules was detected. The luminescence experiments showed that the porphyrin emission is almost totally quenched because of the binding of the groups [Ru(bpy)2Cl]+ and [Ru3O(Ac)6(py)2]+. Photophysics results shows that these two units bounded to porhyrins M(4-N-Py)TFPPH2, cis- and trans- B(4-N-Py)BFPPH2 act as charge receptors.
 
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Publishing Date
2007-09-27
 
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