Effects of NaCl upon TPPS4 triplet state characteristics and singlet oxygen formation

Aggarwal, Lucimara Perpetua Ferreira; Baptista, Maurı́cio S.; Borissevitch, Iouri

doi:10.1016/j.jphotochem.2006.08.003

Cited by 50 publications

(29 citation statements)

References 16 publications

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“…The interaction of porphyrin with environment and with natural or synthetic nano-organized structures, such as cell membranes, micelles and bio-and synthetic polymers greatly affects its electronic structure and, as a consequence, modifies its excited-state characteristics [10][11][12][13][14][15][16][17]. Although a large number of porphyrins with different side groups has been synthesized lately, further study of simple symmetric porphyrins continues to be of interest.…”

Section: Introductionmentioning

confidence: 99%

Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP)

Gonçalves

Franzen

Corrêa

et al. 2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Introductionmentioning

confidence: 99%

Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP)

Gonçalves

Franzen

Corrêa

et al. 2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…[28] The above findings are in a good agreement with the results obtained under similar experimental conditions earlier. [7,9,10,26] A special type of ionic associate formation was observed for CoTPPS in presence of PDDA. Unlike the bulk water CoTPPS solution, a freshly prepared PDDAcontaining system exhibited significant fluorescence at 609 nm, resulting from the possible heteroaggregate formation (Figure 6,a).…”

Section: Resultsmentioning

confidence: 89%

“…The presence of an inorganic salt increasing the ionic strength also leads to a significant broadening of the porphyrin Soret band due to H-aggregate formation, which is consistent with the known data. [26] For other transition metal complexes in the strongly acidic medium (pH<1) the dynamic equilibrium between the coexisting porphyrin species with a various degree of protonation is strongly dependent on the nature of the metal ion. [27] In the case of NiTPPS and CoTPPS the emergence of fluorescence in 662-664 nm region at low pH, which is not characteristic for transition metal porphyrin complexes with an incomplete d-sub-shell due to self-quenching, reveals the presence of metal-free protonated species H 4 TPPS 2-.…”

Section: Resultsmentioning

confidence: 99%

Photophysical Properties and Aggregation Behavior of Transition Metal Tetraphenylporphyrin Tetrasulfonate Complexes in Microheterogeneous Media

Gradova¹,

Лобанов²

2013

MHC

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This paper considers the influence of various surfactants and polyelectrolytes on the photophysical properties and the aggregation state of transition metal complexes of meso-5,10,15,20-tetrakis-(4-sulfonatophenyl) porphyrin (MeTPPS). Porphyrin transition metal complex aggregation stability in acidic medium is also compared for a number of metal cations. The mechanism of J-aggregate formation and the nature of porphyrin-surfactant interactions in microorganized systems are discussed in details.Keywords: Transition metal porphyrin complexes, ZnTPPS, J-aggregates, ionic associates. Фотофизические свойства и агрегационная устойчивость IntroductionPorphyrin based supramolecular assemblies in recent years have been considered as novel mesoscopic materials with tunable electronic and optical properties, useful as photosensitizers, optical switches, molecular sensors, artificial light-harvesting systems and photovoltaic device components. [1][2][3] Such smart materials can include either homoporphyrin aggregates (H-or J-type ones) or multiporphyrin assemblies, [4] as well as heteroaggregates [5] and ionic associates with various non-porphyrin compounds. [6] Since both photophysical and photochemical properties of various porphyrin derivatives strongly depend on the chromophore aggregation state determined predominantly by the medium acidity, ionic strength and the presence of template molecules, controlled reversible aggregation of porphyrin supramolecular assemblies is still of great research interest.To date among the known water-soluble porphyrin derivatives the most well-studied one is meso-5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin (TPPS). During the past decade much work has been done on TPPS interactions with surfactants, [7][8][9][10][11] polyelectrolytes [12][13][14][15] and especially biomacromolecules. [16][17][18] The increasing research interest in porphyrin behavior within microorganized systems is due to their possible application as photosensitizers in photodynamic therapy (PDT), [19] since the microheterogeneous medium is known to favor supramolecular ionic associate and 341 Макрогетероциклы / Macroheterocycles 2013 6(4) 340-344 M. A. Gradova, A. V. Lobanov heteroaggregate formation, especially at low pH abundant in cancer cells. [20][21][22] Despite the large amount of available experimental data, we still lack a unified detailed description of the mechanism of porphyrin aggregate formation in microorganized biomembrane-mimetic media.The main aim of this work was to compare the photophysical properties and the aggregation state of water soluble transition metal complexes of tetraphenylporphyrin tetrasulfonate in various microheterogeneous systems, such as surfactant (SDS, CTAB, TX-100) and polyelectrolyte (PDDA, PVP, PEG) solutions with different surface charge. We especially focused on influence of the cation nature on the porphyrin metal complex stability in acidic medium, J-type aggregate formation and their morphology. ExperimentalTransition metal complexes of cobalt, nickel and zinc with a...

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“…O rendimento quântico de fluorescência foi determinado usando como padrão a porfirina meso-tetrakis(4-N-metil-piridina) TMPyP base livre em solução aquosa com pH = 6, 9 (φ f l = 5, 0% [44]). O rendimento quântico de formação de oxigênio singleto foi determinado usando como padrão a porfirina (Tetrasulfonatofenil porfirina) T PPS 4 que possui rendimento de 62% em tampão fosfato 7, 5mM e pH = 6, 9 [36].…”

Section: Methodsunclassified

Efeitos do meio e da interação com DNA e Micelas nas características espectrais dos corantes ciânicos com dois cromóforos

Schaberle¹

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Effects of NaCl upon TPPS4 triplet state characteristics and singlet oxygen formation

Cited by 50 publications

References 16 publications

Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP)

Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP)

Photophysical Properties and Aggregation Behavior of Transition Metal Tetraphenylporphyrin Tetrasulfonate Complexes in Microheterogeneous Media

Efeitos do meio e da interação com DNA e Micelas nas características espectrais dos corantes ciânicos com dois cromóforos

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