Spectroscopic and photoelectric investigations of resonance effects in selected sulfonated phthalocyanines

Siejak, Aleksandra; Wróbel, Danuta; Siejak, Przemysław; Olejarz, B.; Ion, Rodica‐Mariana

doi:10.1016/j.dyepig.2009.05.013

Cited by 24 publications

(13 citation statements)

References 59 publications

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“…The aggregation behavior of GalPcs affects also the magnitude of singlet oxygen quantum yield (Φ ∆ ) which was calculated with values of 0.38±0.02 (nGalPc), 0.21±0.02 (pGalPc) by using ZnPc as a referent standard (0.56). 16 The wide range of Φ ∆ values can be explained by the position of D-galactose groups. The results suggest that the nature and the position of substituents influence the parameters of the triplet state of the photosensitizer and further the quantum yield of singlet oxygen formation.…”

Section: Singlet Oxygen Formationmentioning

confidence: 99%

“…The fluorescence quantum yields (Φ F ) were determined on the basis of absorption and fluorescence spectra according to the comparative method using ZnPc as referent standard, Φ F(R) =0.18 in DMSO. 16 The absorbance values of the sample and the reference standard at the excitation wavelength were kept around 0.05 in order to avoid the reabsorption.…”

Section: Absorbance and Fluorescence Measurementsmentioning

confidence: 99%

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Effects of the position of galactose units to Zn(II) phthalocyanine on the uptake and photodynamic activity towards breast cancer cells

Mantareva

Kril²,

Ангелов

et al. 2012

SPIE Proceedings

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Zn(II)-phthalocyanines with tetra-substitution of D-galactose group on non-peripheral (nGalPc) and peripheral (pGalPc) positions have been studied as photodynamic sensitizers. The both complexes are water-soluble and highly aggregated in water and cell culture medium. The non-peripheral galactose units attached to the phthalocyanine macrocycle (nGalPc) lead to far red shift of absorbance maximum at 703 nm as compared to peripherally substituted pGalPc with maximum at 683 nm. The fluorescence maxima of the studied GalPcs were red shifted (8-14 nm) depending on the used solvent as compared to the absorption maxima. The relatively low fluorescence quantum yields in dimethylsulfoxide (0.06 for nGalPc and 0.21 for pGalPc) were determined. The singlet oxygen generation was determined with lower quantum yield for pGalPc (0.21) as compared to nGalPc (0.38). The lack of dark toxicity towards breast cancer cell line (MCF-7) in wide concentration range (0.125 -10 µM) was observed. The uptake into the tumor cells and the subcellular localization in MCF-7 cells were determined with higher accumulation for pGalPc, compared to nGalPc. The in vitro photodynamic activity of GalPcs towards breast cancer cells was investigated for different dye concentrations and soft light parameters of 635 nm irradiation. The antitumor activity of nGalPc was superior to the pGalPc-induced cytotoxicity, due to higher generation of singlet oxygen and other reactive oxygen species.

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Section: Singlet Oxygen Formationmentioning

confidence: 99%

Section: Absorbance and Fluorescence Measurementsmentioning

confidence: 99%

Effects of the position of galactose units to Zn(II) phthalocyanine on the uptake and photodynamic activity towards breast cancer cells

Mantareva

Kril²,

Ангелов

et al. 2012

SPIE Proceedings

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“…Material lapisan tipis pada penelitian ini adalah seng ftalosianin (ZnPc) yang dimodifikasi dengan reaksi sulfonasi yaitu penggantian satu atom H dengan satu gugus sulfonil [11,12]. Penelitian ini bertujuan untuk mengetahui pengaruh ketebalan lapisan tipis ZnPcSn terhadap morfologi dan nilai resistansi lapisan tipis ZnPcSn dengan adanya paparan ozon.…”

Section: Pendahuluanunclassified

“…Padatan yang dihasilkan dilarutkan dengan NaOH 0,1 M sebanyak 50 mL dan HCl 0,1 M sebanyak 50 mL untuk mengendapkan garam Seng sulfoftalosianin (ZnPcSn). ZnPcSn yang dihasilkan kemudian disaring, dikeringkan dalam oven dengan suhu 105°C hingga diperoleh massa konstan dan dikarakterisasi dengan FTIR [11,12].…”

Section: Gambar 1 Desain Elektroda Dengan Pola Interdigitalunclassified

Pengaruh Ketebalan Terhadap Nilai Resistansi Lapisan Tipis Seng Sulfoftalosianin (ZnPcSn) Sebagai Prototipe Detektor Ozon

Novitasari

Masruroh

Tjahjanto

2015

Nat-B

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ABSTRAKLapisan tipis ZnPcSn dapat dikembangkan sebagai prototipe detektor gas ozon. Penelitian ini bertujuan untuk mempelajari hubungan antara ketebalan dan nilai resistansi lapisan tipis ZnPcSn pada paparan ozon. Lapisan tipis ZnPcSn dideposisikan pada substrat printed circuit board (PCB) dengan berbagai variasi ketebalan dengan teknik evaporasi vakum. Morfologi lapisan tipis diobservasi dengan scanning electron microscope (SEM). Foto SEM menunjukkan bahwa semakin tebal lapisan, maka poripori yang terbentuk semakin besar dan ketebalan lapisan semakin merata. Untuk memperoleh nilai resistansi, lapisan ZnPcSn dipapar dengan ozon selama 30 menit secara terus menerus. Semakin tebal lapisan ZnPcSn maka semakin banyak molekul ZnPcSn yang terdapat dalam lapisan, sehingga semakin besar interaksi dengan ozon dan menyebabkan penurunan nilai resistansi lapisan. Penurunan nilai resistansi ini mengindikasikan bahwa lapisan tipis ZnPcSn memiliki kemampuan sebagai detektor ozon.Kata kunci : lapisan tipis ZnPcSn, substrat PCB, evaporasi vakum, variasi ketebalan, ozon, nilai resistansi ABSTRACT Thin film of ZnPcSn was developed as a prototype for ozone detector. This study aimed to investigate the relationship thickness of thin film of ZnPcSn along with resistance value toward ozone exposure. The ZnPcSn thin film was deposited on a printed circuit board (PCB) substrate with various thickness using vacuum evaporation technique. The morphology of the thin film was observed using scanning electron microscope (SEM). The SEM images of ZnPcSn thin film showed that thicker layer of thin film leaded to greater pore and uniform distributed layer. To obtain the resistance value, ZnPcSn thin film was exposed to ozone for 30 minutes continuously. Ozone was synthesized by ozonator from air. Thicker film with higher ZnPcSn content had more intensive interaction with ozone. Higher interaction with ozone leaded to the increasing value of generated current, indicated by the decreasing of the thin film resistance value. This result demonstrated that the ZnPcSn thin film has promising potential as ozone detector.

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“…As seen, more than 50 % of the absorbed energy in samples 1 and 2 is converted promptly into heat. The sum of K 1 and K 2 is less than 1; it indicates the occurrence of other processes with triplet state participation (it is discussed widely in [21,[62][63][64]). A spin-orbit perturbation enhancement could be neglected since we have used metal-free dyes in our experiment.…”

Section: Pas and Lioas Experimentsmentioning

confidence: 99%

Triplet Thermal Relaxation Study as a Probe of Weak Interdimers of Porphyrin Derivatives

2011

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This article deals with results concerning the study of interacting dyes which are able to create weak interdimers. Two groups of organic systems: phthalocyanines (di-ethanol-amine and di-octane-amine) and pyridyl porphyrins (zinc, copper, and free-base) covalently linked to polyethylene glycol (PEG) in water and organic solvents (dioxane, dimethylsulfoxide) were investigated. Absorption, fluorescence, and photoacoustics were used as experimental methods but particular attention was paid to light-induced optoacoustic spectroscopy to follow the dye's triplet population and triplet thermal relaxation to study intermolecular interactions. It has been shown that even the weak interactions of the organic dyes under study is not detectable by absorption and only slightly by fluorescence is it possible to follow interactions by complementary photothermal methods. The results obtained for selected phthalocyanines and covalent porphyrin-polymer samples evidently show that the lightinduced optoacoustic experiment is a perfect tool in the detection of weakly interacting aggregates.

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Spectroscopic and photoelectric investigations of resonance effects in selected sulfonated phthalocyanines

Cited by 24 publications

References 59 publications

Effects of the position of galactose units to Zn(II) phthalocyanine on the uptake and photodynamic activity towards breast cancer cells

Effects of the position of galactose units to Zn(II) phthalocyanine on the uptake and photodynamic activity towards breast cancer cells

Pengaruh Ketebalan Terhadap Nilai Resistansi Lapisan Tipis Seng Sulfoftalosianin (ZnPcSn) Sebagai Prototipe Detektor Ozon

Triplet Thermal Relaxation Study as a Probe of Weak Interdimers of Porphyrin Derivatives

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